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KONISHI Knob Screws(Main Body, Type:Round Shape)

KONISHI offers products Knob Screws specified by Main Body, Type Round Shape from Automation Components product category. There are a total of 23 items. Search and select detailed specifications of parts for your machine with free CAD downloads. KONISHI products are available to order through MISUMI online 24 hours a day. Free shipping, no minimum order.
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  • You can add up to 6 items per a category to the compare list.
    Stainless Gripping Ball, Mirror Finish, SUSBA

    Stainless Gripping Ball, Mirror Finish, SUSBA

    KONISHI

    A stainless steel ball grip, where the surface has a beautiful mirror finish.
    From: ฿ 516.64
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Sale
    Knurled Thumb Knobs TKS, TKN, TKS-Sus, TKN-Sus
    Until 30/04/2024
    Sale
    Until 30/04/2024

    Knurled Thumb Knobs TKS, TKN, TKS-Sus, TKN-Sus

    KONISHI

    Knurled Thumb Knobs TKS, TKN, TKS-Sus, TKN-Sus
    Knobs Screws are commonly used in various applications to secure, adjust, and control different mechanical devices. They offer a wide variety of sizes to choose from.
    [Feature]
    ● Shape : Round type with stepped
    ● Thread Size : M4, M5, M6, M8 and M10
    ● Material : SUM22L
    Knob - SUM22 Steel and SUS303 Stainless
    [Application]
    Knob Screws are commonly used in fastening, assembly, adjustment, clamping and so on
    From: ฿ 104.34
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Mushroom Knobs MKF

    Mushroom Knobs MKF

    KONISHI

    It is made of black phenolic resin and has a male screw the knob has a glossy and beautiful surface. Operating temperature max110° C min-20° C
    From: ฿ 196.39
    Days to Ship: day to ship 5 Day(s)
    day to ship 5 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Control Knob M8801

    Control Knob M8801

    KONISHI

    [Features]·Volume knob. [Materials]·Made of Aluminum.
    From: ฿ 489.49
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Sale
    Plastic Knob BA/BB
    Until 30/04/2024
    Plastic Knob BA/BB
    Plastic Knob BA/BB
    Plastic Knob BA/BB
    Plastic Knob BA/BB
    Sale
    Until 30/04/2024

    Plastic Knob BA/BB

    KONISHI

    A spherical safety knob with no protrusions.
    [Features]
    · Made of black and red phenolic resin and the spherical surface is glossy and attractive.
    · Operating temperature: -20 to +110°C.
    [Applications]
    · Can be screwed to the end of a shaft and used as a knob.
    From: ฿ 61.16
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Sale
    Grill Knob GKF
    Until 30/04/2024
    Sale
    Until 30/04/2024

    Grill Knob GKF

    KONISHI

    Grill Knob GKF
    Knobs Screws are commonly used in various applications to secure, adjust, and control different mechanical devices. They offer a wide variety of sizes to choose from.
    [Feature]
    ● Shape : Round Shape with Diamond cut
    ● Thread Size : M5, M6, M8, M10 and M12
    ● Material : SUM23 and SUS303
    Knob - Nylon Resin Black
    Screw : C3604B brass
    [Application]
    Knob Screws are commonly used in fastening, assembly, adjustment, clamping and so on
    From: ฿ 140.18
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Knurled Nut (Black Iron Oxide Film) KNTA-B, KNTB-B

    Knurled Nut (Black Iron Oxide Film) KNTA-B, KNTB-B

    KONISHI

    Knob with round knurl on the outer part of the knob. The surface treatment is black.
    From: ฿ 192.20
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Knurled Nut (Stainless Steel) KNTA-Sus

    Knurled Nut (Stainless Steel) KNTA-Sus

    KONISHI

    Stainless steel tough knob with a round knurl on the outer ring of the knob part.
    From: ฿ 378.45
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Sale
    Control Knob M8802
    Until 30/04/2024
    Sale
    Until 30/04/2024

    Control Knob M8802

    KONISHI

    [Features]·Volume knob. [Materials]·Made of Aluminum.
    From: ฿ 1,373.46
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Control Knob M8803

    Control Knob M8803

    KONISHI

    [Features]·Volume knob. [Materials]·Made of Aluminum.
    From: ฿ 466.22
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Knurling Knob KS

    Knurling Knob KS

    KONISHI

    A knob made of phenolic resin with an Italian design.
    [Features]
    · Made of black phenolic resin with male thread specifications.
    · Glossy and beautiful surface.
    · Operating temperature: max. 110°C, min. -20°C.
    [Applications]
    · Ideal for tightening and loosening jigs.
    From: ฿ 101.61
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Knurled Knob KN

    Knurled Knob KN

    KONISHI

    It is made of black phenolic resin and has a male screw the knob has a glossy and beautiful surface. Operating temperature max110° C min-20° C
    From: ฿ 105.68
    Days to Ship: day to ship 4 Day(s)
    day to ship 4 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Long Knurled Knob LKK

    Long Knurled Knob LKK

    KONISHI

    It is made of black phenolic resin, with a male screw and the surface of the knob is glossy and beautiful. It is a knob with a long boss section that is pleasant to grip. Operating temperature max110° C min-20° C
    From: ฿ 119.17
    Days to Ship: day to ship 4 Day(s)
    day to ship 4 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Long Knurled Knob LKF

    Long Knurled Knob LKF

    KONISHI

    It is made of black phenolic resin and has a male screw the knob has a glossy and beautiful surface. It is a knob with a long boss section that is pleasant to grip. Operating temperature max110° C min-20° C
    From: ฿ 128.54
    Days to Ship: day to ship 4 Day(s)
    day to ship 4 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Mushroom Knob MK

    Mushroom Knob MK

    KONISHI

    It is made of black phenolic resin, with a male screw and the surface of the knob is glossy and beautiful. Operating temperature max110° C min-20° C
    From: ฿ 196.55
    Days to Ship: day to ship 5 Day(s)
    day to ship 5 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Grill Knob GK

    Grill Knob GK

    KONISHI

    It is a beautiful knob with a small square cut. Matte black nylon resin made male screw. Operating temperature max80° C min-20° C
    From: ฿ 132.48
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Flute Knob FTK, FTK-A-Sus

    Flute Knob FTK, FTK-A-Sus

    KONISHI

    Matte black polypropylene resin male threaded screw specifications. There are also stainless steel specifications for the screw part. Operating temperature max80° C min-20° C
    From: ฿ 109.62
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Flute Knobs FTK-B, FTK-B-Sus

    Flute Knobs FTK-B, FTK-B-Sus

    KONISHI

    It is a male screw made of polished black polypropylene resin. The thread is made of steel, the surface is trivalent chromate treated and made of stainless steel. Operating temperature max80° C min-20° C
    From: ฿ 105.68
    Days to Ship: day to ship 4 Day(s)
    day to ship 4 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Sale
    Flute Knob FTK-T
    Until 30/04/2024
    Sale
    Until 30/04/2024

    Flute Knob FTK-T

    KONISHI

    Female screw made of polished black polypropylene resin. The screw is made of brass and stainless steel. Operating temperature max80° C min-20° C
    From: ฿ 118.09
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Knurled Nuts ZKS, ZKN, ZKS-sus, ZKN-sus

    Knurled Nuts ZKS, ZKN, ZKS-sus, ZKN-sus

    KONISHI

    A male screw and female screw made of matte black polypropylene resin. The thread is made of steel, the surface is trivalent chromate treated and made of stainless steel. Operating temperature max80° C min-20° C
    From: ฿ 95.61
    Days to Ship: day to ship 4 Day(s)
    day to ship 4 Day(s)
  • You can add up to 6 items per a category to the compare list.
    Sale
    Control Knob M8805
    Until 30/04/2024
    Sale
    Until 30/04/2024

    Control Knob M8805

    KONISHI

    Volume knob made of phenol resin.
    From: ฿ 409.55
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Sale
    Control Knob M8806
    Until 30/04/2024
    Sale
    Until 30/04/2024

    Control Knob M8806

    KONISHI

    Volume knob made of phenolic resin.
    [Features]
    · Made from phenolic resin.
    · Operating temperature: -20 to +110°C.
    [Applications]
    · Can be used for rotation of the mounting shaft.
    From: ฿ 146.09
    Special Price
    Days to Ship: day to ship Same day
    day to ship Same day
  • You can add up to 6 items per a category to the compare list.
    Knurling Nut (Chrome Plating) KNTA, KNTB

    Knurling Nut (Chrome Plating) KNTA, KNTB

    KONISHI

    Tough knob with vertical knurling around the outside of the knob. Surface treatment is nickel chrome plating.
    From: ฿ 245.42
    Days to Ship: day to ship 3 Day(s)
    day to ship 3 Day(s)
Brand
Product Series
CAD
From
Days to Ship
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.
Stainless Gripping Ball, Mirror Finish, SUSBA
You can add up to 6 items per a category to the compare list.
Sale
Knurled Thumb Knobs TKS, TKN, TKS-Sus, TKN-Sus
Until 30/04/2024
You can add up to 6 items per a category to the compare list.
Mushroom Knobs MKF
You can add up to 6 items per a category to the compare list.
Control Knob M8801
You can add up to 6 items per a category to the compare list.
Sale
Plastic Knob BA/BB
Until 30/04/2024
Plastic Knob BA/BB
Plastic Knob BA/BB
Plastic Knob BA/BB
Plastic Knob BA/BB
You can add up to 6 items per a category to the compare list.
Sale
Grill Knob GKF
Until 30/04/2024
You can add up to 6 items per a category to the compare list.
Knurled Nut (Black Iron Oxide Film) KNTA-B, KNTB-B
You can add up to 6 items per a category to the compare list.
Knurled Nut (Stainless Steel) KNTA-Sus
You can add up to 6 items per a category to the compare list.
Sale
Control Knob M8802
Until 30/04/2024
You can add up to 6 items per a category to the compare list.
Control Knob M8803
You can add up to 6 items per a category to the compare list.
Knurling Knob KS
You can add up to 6 items per a category to the compare list.
Knurled Knob KN
You can add up to 6 items per a category to the compare list.
Long Knurled Knob LKK
You can add up to 6 items per a category to the compare list.
Long Knurled Knob LKF
You can add up to 6 items per a category to the compare list.
Mushroom Knob MK
You can add up to 6 items per a category to the compare list.
Grill Knob GK
You can add up to 6 items per a category to the compare list.
Flute Knob FTK, FTK-A-Sus
You can add up to 6 items per a category to the compare list.
Flute Knobs FTK-B, FTK-B-Sus
You can add up to 6 items per a category to the compare list.
Sale
Flute Knob FTK-T
Until 30/04/2024
You can add up to 6 items per a category to the compare list.
Knurled Nuts ZKS, ZKN, ZKS-sus, ZKN-sus
You can add up to 6 items per a category to the compare list.
Sale
Control Knob M8805
Until 30/04/2024
You can add up to 6 items per a category to the compare list.
Sale
Control Knob M8806
Until 30/04/2024
You can add up to 6 items per a category to the compare list.
Knurling Nut (Chrome Plating) KNTA, KNTB
Brand

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

KONISHI

Product Series

Stainless Gripping Ball, Mirror Finish, SUSBA

Knurled Thumb Knobs TKS, TKN, TKS-Sus, TKN-Sus

Mushroom Knobs MKF

Control Knob M8801

Plastic Knob BA/BB

Grill Knob GKF

Knurled Nut (Black Iron Oxide Film) KNTA-B, KNTB-B

Knurled Nut (Stainless Steel) KNTA-Sus

Control Knob M8802

Control Knob M8803

Knurling Knob KS

Knurled Knob KN

Long Knurled Knob LKK

Long Knurled Knob LKF

Mushroom Knob MK

Grill Knob GK

Flute Knob FTK, FTK-A-Sus

Flute Knobs FTK-B, FTK-B-Sus

Flute Knob FTK-T

Knurled Nuts ZKS, ZKN, ZKS-sus, ZKN-sus

Control Knob M8805

Control Knob M8806

Knurling Nut (Chrome Plating) KNTA, KNTB

CAD
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
  • 2D
From

฿ 516.64

฿ 104.34

Special Price

On Sale Until 30/04/2024

฿ 196.39

฿ 489.49

฿ 61.16

Special Price

On Sale Until 30/04/2024

฿ 140.18

Special Price

On Sale Until 30/04/2024

฿ 192.20

฿ 378.45

฿ 1,373.46

Special Price

On Sale Until 30/04/2024

฿ 466.22

฿ 101.61

฿ 105.68

฿ 119.17

฿ 128.54

฿ 196.55

฿ 132.48

฿ 109.62

฿ 105.68

฿ 118.09

Special Price

On Sale Until 30/04/2024

฿ 95.61

฿ 409.55

Special Price

On Sale Until 30/04/2024

฿ 146.09

Special Price

On Sale Until 30/04/2024

฿ 245.42

Days to Ship 3 Day(s) Same day 5 Day(s) 3 Day(s) Same day Same day 3 Day(s) 3 Day(s) Same day 3 Day(s) 3 Day(s) 4 Day(s) 4 Day(s) 4 Day(s) 5 Day(s) 3 Day(s) 3 Day(s) 4 Day(s) Same day 4 Day(s) Same day Same day 3 Day(s)
Mounting Section Dia. d (mm) or Nominal Dia.M5 ~ M12M4 ~ M10M5 ~ M86.1M5 ~ M16M5 ~ M12M5 ~ M12M5 ~ M126.16.1M4 ~ M10M4 ~ M12M6 ~ M8M6 ~ M10M5 ~ M8M5 ~ M12M5 ~ M10M4 ~ M8M5 ~ M10M5 ~ M106.16.1M5 ~ M12
Mounting Section TypeTappedThreaded (Stepped) / Tapped (Stepped)TappedRound BoreTappedTapped (Stepped)Tapped (Stepped)Tapped (Stepped)Round BoreRound BoreThreaded (Stepped)Tapped (Stepped)Threaded (Stepped)Tapped (Stepped)ThreadedThreaded (Stepped)Threaded (Stepped)Tapped (Stepped)Tapped (Stepped)Threaded (Stepped) / Tapped (Stepped)Round BoreRound BoreTapped (Stepped)
Mounting Section, Length L(mm)10 ~ 246 ~ 407 ~ 12179 ~ 2610 ~ 207 ~ 147 ~ 1410 ~ 2013.5 ~ 1610 ~ 405 ~ 2016 ~ 2516 ~ 209 ~ 1410 ~ 5010 ~ 405 ~ 1010 ~ 1510 ~ 401212.5 ~ 157 ~ 14
Main Body, TypeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound ShapeRound Shape
Main Body MaterialStainless SteelStainless Steel / SteelPhenolAluminumPhenolNylonSteelStainless SteelAluminumAluminumPhenolPhenolPhenolPhenolPhenolNylonPolypropylenePolypropylenePolypropyleneNylonPhenolPhenolSteel
Round Shape, TypeBallsCylindrical ShapeMushroom ShapeVolume Knob ShapeBallsCylindrical ShapeClamp ShapeClamp ShapeVolume Knob ShapeVolume Knob ShapeCylindrical ShapeCylindrical ShapeCylindrical ShapeCylindrical ShapeMushroom ShapeCylindrical ShapeClamp ShapeClamp ShapeClamp ShapeClamp ShapeRose ShapeVolume Knob ShapeClamp Shape
Mounting Section, MaterialStainless SteelStainless Steel / SteelBrassAluminumPhenol / BrassBrassSteelStainless SteelAluminumAluminumSteelBrassSteelBrassSteelSteelStainless Steel / SteelStainless Steel / BrassBrassStainless Steel / Steel / BrassBrassBrassSteel
Threaded End Machining-None--------None-None-NoneNoneNone--None---
Set Screw Flat MachiningNoneNoneNoneProvided (1 Place)NoneNoneNone / Provided (1 Place)NoneProvided (1 Place) / Provided (2 Places)Provided (1 Place)NoneNoneNoneNoneNoneNoneNoneNoneNoneNoneProvided (2 Places)Provided (1 Place)None / Provided (1 Place)
Side MachinedNot ProvidedKnurlingNot ProvidedKnurlingNot ProvidedDiamond CutKnurlingKnurlingKnurlingKnurlingDimpleDimpleDimpleDimpleNot ProvidedDiamond CutDimpleDimpleDimpleKnurlingNot ProvidedNot ProvidedKnurling
Polygonal Shape, Type-----------------------
T Shape, Type-----------------------
Additional FunctionNot ProvidedNot ProvidedNot ProvidedWith ScaleNot ProvidedNot ProvidedNot Provided / LockNot ProvidedWith ScaleWith ScaleNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedNot ProvidedWith ScaleWith ScaleNot Provided / Lock
Tapped, Round Hole MachiningBlind BoreThroughBlind BoreBlind BoreBlind BoreBlind BoreThroughThroughBlind BoreBlind Bore-Blind Bore-Blind Bore---Blind BoreThroughBlind BoreBlind BoreBlind BoreThrough
Main Body, Surface TreatmentBuffedNone / Chrome PlatingNoneNoneNoneNoneBlack OxideNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneChrome Plating
Mounting Section, Surface TreatmentNoneNone / Chrome PlatingNoneNoneNoneNoneBlack OxideNoneNoneNoneTrivalent ChromateNoneTrivalent ChromateNoneTrivalent ChromateTrivalent ChromateNone / Trivalent ChromateNoneNoneNone / Trivalent ChromateNoneNoneChrome Plating

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  1. 1

Related Categories to 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.