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ESCO Knob Screws

Knob Screws products in the Automation Components category from ESCO. The product can be selected based specifications such as Mounting Section Dia. d (mm) or Nominal Dia., Mounting Section Type, Mounting Section, Length L, Main Body, Type, Main Body Material. ESCO offers products around 15 items and the product specifications can easily be compared. Search and select detailed specifications of parts for your machine with free CAD download. ESCO products are available to order through MISUMI online 24/7. Free shipping, no minimum order.
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15 itemsMặt hàng

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  • You can add up to 6 items per a category to the compare list.

    Male Threaded Dimple Knob with Stepped Male Thread

    Male Threaded Dimple Knob with Stepped Male Thread

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob male thread dimple knob. ·Male thread with tiers.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M6 ~ M8 Threaded (Stepped) 20 ~ 25 Round Shape Nylon Cylindrical Shape Others - - - - - Not Provided - - -
    From: 208,646 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    [NO. 1]UF Screw

    [NO. 1]UF Screw【6 Pieces Per Package】

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob, "NO. 1", UF screw.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M3 Threaded 6 ~ 20 Round Shape Others Cylindrical Shape Others - - - - - Not Provided - - -
    From: 176,983 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    T-Shaped Knob

    T-Shaped Knob

    ESCO

    [Features]·ESCO Co., Ltd Knob. ·T-shaped knob. ·Wing T-shaped type.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M6 ~ M12 Threaded 20 ~ 30 Special Shape Polyamide - Others - - - - - Not Provided - - -
    From: 283,618 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    male thread grip knob

    male thread grip knob

    ESCO

    [Features]·ESCO Co., Ltd Male thread grip knob.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M4 Threaded - Round Shape Nylon Cylindrical Shape Others - - - - - Not Provided - Others Zinc Plating
    From: 168,648 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Male thread/female thread knob

    Male thread/female thread knob

    ESCO

    [Features]·ESCO Co., Ltd Knob, Male thread, Female thread knob.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M8 ~ M12 Threaded (Stepped) 25 ~ 40 Special Shape Polyamide - Others - - - - - Not Provided - - -
    From: 357,501 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Male threaded dimple knob Male thread

    Male threaded dimple knob Male thread

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob male thread dimple knob. ·Male thread.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M3 ~ M8 Threaded 10 ~ 25 Round Shape Nylon Cylindrical Shape Others - - - - - Not Provided - - -
    From: 153,906 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    male thread knob (Nylon)

    male thread knob (Nylon)

    ESCO

    [Features]·ESCO Co., Ltd Knobs/knobs, Male thread knobs (Nylon).

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M5 ~ M12 Threaded 25 ~ 40 Special Shape Nylon - Others - - - - - Not Provided - - -
    From: 134,933 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    male thread chrysanthemum knob (Nylon)

    male thread chrysanthemum knob (Nylon)

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob, Male thread chrysanthemum knob (Nylon).

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M12 Threaded 50 Special Shape Nylon - Others - - - - - Not Provided - - -
    From: 249,783 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    screw knob (phenol resin)

    screw knob (phenol resin)

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob, Screw knob (Phenol resin).

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M6 Threaded - Round Shape Phenol Mushroom Shape Others - - - - - Not Provided - - Bright Chrome Plating
    From: 185,023 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Male thread/female thread knob (Stainless Steel)

    Male thread/female thread knob (Stainless Steel)

    ESCO

    [Features]·Excellent corrosion resistance making it suitable for food machine, cleaning machine, etc.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M3 ~ M10 Threaded / Tapped 10 ~ 25 Round Shape Others Cylindrical Shape Others - - - - - Not Provided - - -
    From: 235,978 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Male Threaded Knob T Shape

    Male Threaded Knob T Shape

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob, Male thread knob. ·T-shaped.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M4 ~ M8 Threaded 6 ~ 25 Special Shape Polyamide - Others - - - - - Not Provided - - -
    From: 129,375 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    female thread plastic knob

    female thread plastic knob

    ESCO

    [Features]·ESCO Co., Ltd Knobs/knobs, Female thread plastic knobs.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M8 ~ M12 Tapped (Stepped) 12 ~ 20 Special Shape Polyamide - Others - - - - - Not Provided - - -
    From: 187,213 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Male Threaded Knob Round

    Male Threaded Knob Round

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob, Male thread knob. ·Round type.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M10 ~ M12 Threaded (Stepped) 20 ~ 30 Round Shape Polypropylene Cylindrical Shape Others - - - - - Not Provided - - -
    From: 242,503 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    Male Thread Knurled Knob

    Male Thread Knurled Knob

    ESCO

    [Features]·ESCO Co., Ltd Male thread knurled knob.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M4 ~ M8 Threaded (Stepped) 6 ~ 16 Round Shape Phenol Cylindrical Shape Others - - - - - Not Provided - - -
    From: 118,750 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
  • You can add up to 6 items per a category to the compare list.

    [NO. 2]UF Screw

    [NO. 2]UF Screw【6 Pieces Per Package】

    ESCO

    [Features]·ESCO Co., Ltd Knob/knob, "NO. 2", UF screw.

    Mounting Section Dia. d (mm) or Nominal Dia. Mounting Section Type Mounting Section, Length L(mm) Main Body, Type Main Body Material Round Shape, Type Mounting Section, Material Threaded End Machining Set Screw Flat Machining Side Machined Polygonal Shape, Type T Shape, Type Additional Function Tapped, Round Hole Machining Main Body, Surface Treatment Mounting Section, Surface Treatment
    M4 ~ M5 Threaded 8 ~ 20 Round Shape Others Cylindrical Shape Others - - - - - Not Provided - - -
    From: 173,517 VND
    Days to Ship: Số ngày giao hàng: 7 Day(s) or more
    day to ship 7 Day(s) or more
BrandNhãn hiệu
Product SeriesDòng sản phẩm
From
Days to ShipSố ngày giao hàng
Mounting Section Dia. d (mm) or Nominal Dia.
Mounting Section Type
Mounting Section, Length L(mm)
Main Body, Type
Main Body Material
Round Shape, Type
Mounting Section, Material
Threaded End Machining
Set Screw Flat Machining
Side Machined
Polygonal Shape, Type
T Shape, Type
Additional Function
Tapped, Round Hole Machining
Main Body, Surface Treatment
Mounting Section, Surface Treatment

    You can add up to 6 items per a category to the compare list.

    Male Threaded Dimple Knob with Stepped Male Thread

        You can add up to 6 items per a category to the compare list.

        [NO. 1]UF Screw

            You can add up to 6 items per a category to the compare list.

            T-Shaped Knob

                You can add up to 6 items per a category to the compare list.

                male thread grip knob

                    You can add up to 6 items per a category to the compare list.

                    Male thread/female thread knob

                        You can add up to 6 items per a category to the compare list.

                        Male threaded dimple knob Male thread

                            You can add up to 6 items per a category to the compare list.

                            male thread knob (Nylon)

                                You can add up to 6 items per a category to the compare list.

                                male thread chrysanthemum knob (Nylon)

                                    You can add up to 6 items per a category to the compare list.

                                    screw knob (phenol resin)

                                        You can add up to 6 items per a category to the compare list.

                                        Male thread/female thread knob (Stainless Steel)

                                            You can add up to 6 items per a category to the compare list.

                                            Male Threaded Knob T Shape

                                                You can add up to 6 items per a category to the compare list.

                                                female thread plastic knob

                                                    You can add up to 6 items per a category to the compare list.

                                                    Male Threaded Knob Round

                                                        You can add up to 6 items per a category to the compare list.

                                                        Male Thread Knurled Knob

                                                            You can add up to 6 items per a category to the compare list.

                                                            [NO. 2]UF Screw
                                                              BrandNhãn hiệu

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              ESCO

                                                              Product SeriesDòng sản phẩm

                                                              Male Threaded Dimple Knob with Stepped Male Thread

                                                              [NO. 1]UF Screw【6 Pieces Per Package】

                                                              T-Shaped Knob

                                                              male thread grip knob

                                                              Male thread/female thread knob

                                                              Male threaded dimple knob Male thread

                                                              male thread knob (Nylon)

                                                              male thread chrysanthemum knob (Nylon)

                                                              screw knob (phenol resin)

                                                              Male thread/female thread knob (Stainless Steel)

                                                              Male Threaded Knob T Shape

                                                              female thread plastic knob

                                                              Male Threaded Knob Round

                                                              Male Thread Knurled Knob

                                                              [NO. 2]UF Screw【6 Pieces Per Package】

                                                              From

                                                              208,646 VND-

                                                              176,983 VND-

                                                              283,618 VND-

                                                              168,648 VND

                                                              357,501 VND-

                                                              153,906 VND-

                                                              134,933 VND-

                                                              249,783 VND

                                                              185,023 VND

                                                              235,978 VND-

                                                              129,375 VND-

                                                              187,213 VND-

                                                              242,503 VND-

                                                              118,750 VND-

                                                              173,517 VND-

                                                              Days to ShipSố ngày giao hàng 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more 7 Day(s) or more
                                                              Mounting Section Dia. d (mm) or Nominal Dia.M6 ~ M8M3M6 ~ M12M4M8 ~ M12M3 ~ M8M5 ~ M12M12M6M3 ~ M10M4 ~ M8M8 ~ M12M10 ~ M12M4 ~ M8M4 ~ M5
                                                              Mounting Section TypeThreaded (Stepped)ThreadedThreadedThreadedThreaded (Stepped)ThreadedThreadedThreadedThreadedThreaded / TappedThreadedTapped (Stepped)Threaded (Stepped)Threaded (Stepped)Threaded
                                                              Mounting Section, Length L(mm)20 ~ 256 ~ 2020 ~ 30-25 ~ 4010 ~ 2525 ~ 4050-10 ~ 256 ~ 2512 ~ 2020 ~ 306 ~ 168 ~ 20
                                                              Main Body, TypeRound ShapeRound ShapeSpecial ShapeRound ShapeSpecial ShapeRound ShapeSpecial ShapeSpecial ShapeRound ShapeRound ShapeSpecial ShapeSpecial ShapeRound ShapeRound ShapeRound Shape
                                                              Main Body MaterialNylonOthersPolyamideNylonPolyamideNylonNylonNylonPhenolOthersPolyamidePolyamidePolypropylenePhenolOthers
                                                              Round Shape, TypeCylindrical ShapeCylindrical Shape-Cylindrical Shape-Cylindrical Shape--Mushroom ShapeCylindrical Shape--Cylindrical ShapeCylindrical ShapeCylindrical Shape
                                                              Mounting Section, MaterialOthersOthersOthersOthersOthersOthersOthersOthersOthersOthersOthersOthersOthersOthersOthers
                                                              Threaded End Machining---------------
                                                              Set Screw Flat Machining---------------
                                                              Side Machined---------------
                                                              Polygonal Shape, Type---------------
                                                              T Shape, Type---------------
                                                              Additional FunctionNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot Provided
                                                              Tapped, Round Hole Machining---------------
                                                              Main Body, Surface Treatment---Others-----------
                                                              Mounting Section, Surface Treatment---Zinc Plating----Bright Chrome Plating------

                                                              Loading...Tải…

                                                              1. 1

                                                              Related Categories to Knob ScrewsDanh mục liên quan đến Knob Screws

                                                              FAQ Knob Screws

                                                              Question: How do I properly install the knob screw?
                                                              Answer: Here are some example to install a Knob Screws tapped type
                                                              1. Prepare the Surface: Clean and clear the area where the knob screw will be installed.
                                                              2. Choose the Right Screw: Select a screw with the appropriate size and thread that matches the knob.
                                                              3. Mark the Location: Use a pencil to mark where the knob screw will go, ensuring proper alignment.
                                                              4. Create Pilot Holes (if needed): Use a drill to create small guide holes in the marked spots, if the material is hard.
                                                              5. Insert the Screw: Place the screw through the knob and into the pilot hole or surface.
                                                              6. Tighten the Screw: Use a screwdriver to turn the screw clockwise, securely fastening the knob in place.
                                                              7. Test the Knob: Check the knob's movement and stability to ensure proper installation.
                                                              8. Adjust if Necessary: If the knob feels loose, you may need to tighten the screw further.
                                                              Question: Type of knobs screw?
                                                              Answer: There are various types of knob screws designed for specific applications. Here are a few common types:
                                                              1. Round Knurled Thumb Screws: These have textured heads for better grip, often used in applications where a secure grip is essential.
                                                              Round Knurled Thumb Screws
                                                              2. Lobed Knobs: Have a lobed design for a comfortable grip, commonly found on industrial and mechanical equipment.
                                                              Lobed Knobs
                                                              3. Ball Knobs: These have a spherical shape and are commonly used on levers or control mechanisms.
                                                              Ball Knobs
                                                              4. T-Knobs: Shaped like the letter "T," these knobs are simple to turn and are used in applications where frequent adjustments are needed.
                                                              T-Knobs
                                                              5. Star Knobs: Featuring a star-shaped head for easy turning, often used in applications requiring frequent adjustments.
                                                              Star Knobs
                                                              6. Mushroom Knobs: Shaped like a mushroom. It is used for cabinets, drawers, and doors, these knobs provide a comfortable grip for opening and closing
                                                              Mushroom Knobs
                                                              Question: How to choose the knob screw?
                                                              Answer: Here are some example how to choose the knob screw
                                                              1. Usage: Identify its purpose, such as indoor/outdoor and specific applications like machines, jig fixtures, doors, cabinets, etc.
                                                              2. Material: Match durability to the environment (stainless steel, aluminum, brass and plastic (eg., ABS, Nylon and so on).
                                                              3. Thread Type and Thread Size : Ensure screw matches knob (Threaded, Tapped) or Press fit. and the thread size is appropriate to install
                                                              4. Size: Select a knob head size that is appropriate for your intended use.
                                                              5. Head Type: Choose based on knob design (eg.,round, T Shape, Wing Shape, Polygon shape etc.).
                                                              6. Easy to install : Ensure easy installation and tightening.
                                                              7. Follow Guidelines: Check knob manufacturer's recommendations.
                                                              Question: What is the usage for knob screw?
                                                              Answer: The primary usage of a knob screw is to enable manual control, adjustment, or fastening in a wide range of applications. Here are additional examples of how knob screws are used:
                                                              1. Camera Tripods: Knob screws are used to secure the legs and adjust the height of camera tripods, aiding photographers in achieving stable shots.
                                                              2. HVAC Systems: Knob screws are used to control airflow direction and intensity in ventilation systems, enhancing indoor air quality and comfort.
                                                              3. Scientific Research Instruments: In laboratories, knob screws are employed to fine-tune the position of laser optics, ensuring precise experimental setups.
                                                              4. Automated Manufacturing: Knob screws play a role in industrial automation by adjusting the position of sensors.
                                                              Question: What is the difference of knob screw and door knob?
                                                              Answer: Knob Screw:
                                                              A knob screw is a type of fastener used to secure or adjust objects together. It consists of a threaded and a head. The head is designed for easy gripping and turning by hand. Knob screws are commonly used in applications where frequent adjustments or temporary fastening is required. They are often found in devices like clamps, jigs, and fixtures. The main purpose of a knob screw is to provide a manual way of securing two components together without the need for additional tools.

                                                              Door Knob:
                                                              A door knob, on the other hand, is a handle or knob attached to a door that allows people to open and close the door. It is usually mounted on a spindle that connects the knob on the outside of the door to a mechanism on the inside, allowing the door to be latched or unlatched. Door knobs come in various designs and materials, and they serve both functional and aesthetic purposes. They are an integral part of doors in buildings and structures

                                                              In summary,
                                                              A knob screw is a threaded fastener used for securing or adjusting objects together, often by hand.
                                                              A door knob is a handle attached to a door, allowing people to open and close the door, serving a functional and aesthetic purpose.