Grub Screws & Set Screws

A grub screw, also known as a set screw is used for securing sliding or moving components in place. Grubs screws have threaded inserts instead of tapering screw grooves. The screw is passed through a threaded hole in the outer object and then tightened against the inner object to prevent it from moving relative to the outer object. Grub screws are commonly used to secure a pulley or a gear to a shaft or for attaching a handle or cam to a spindle.

These screws can be made from materials such as steel, stainless steel, nylon, brass and ceramic and are available in a wide range of very small sizes.

Types of Grub Screw

Grub Screws are divided into two types, a hexagon head (sometimes called a hexagon set screw) and a socket head.

Hexagon Head Grub Screw - these have a hexagonal head with a thread that extends all the way to the head.

Socket Head Drive Grub Screws - these are headless with recessed drive ports into which you can insert a tool such as a hexagonal Allen key. When used the entire screw is encased in the material it is fastening without any exposed screw or bolt heads making them ideal for mechanical systems where metal surfaces rub together or to provide an aesthetic finish. These are generally more corrosion resistant, can be tightened using more torque and are secure and difficult to remove.

Drive Types

Grub screws have different drive types, including a straight slot for a standard flat screwdriver, a hex socket, a square socket, an external hex, an external square or a Bristol spline.

Point Types

Grub screws also have a range of different point types which mean they can be used for a range of different applications.

Flat Point screws are used where a screw must press flat against a surface.

Domed Point screws apply pressure to the part opposite the screw head.

Cone Point and Cup Point screws apply force to soft materials or to fit into a depression to the part opposite the screw head. Cup point screws apply a greater force.

Knurled Point screws are like cup point screws but have parallel serrations with a ratchet-locking action preventing loosening due to vibration.

Extended Point or Dog Point screws have a cylindrical head at the end which can be used as a pivot shaft for other parts that need to rotate around it.


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Description Price Length Thread Size Material Stainless Steel Type Finish Head Shape Screw Type Drive Type
RS Stock No. 917-2839
BrandRS PRO
£7.31
1 Bag of 50
Bag(s)
60mm M5 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 483-2356
BrandRS PRO
£20.46
1 Bag of 100
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20mm M5 Brass - Plain Hex Set Screw Hex
RS Stock No. 187-0737
BrandRS PRO
£11.92
1 Bag of 50
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5mm M5 Stainless Steel A4 316 Plain Hex - -
RS Stock No. 187-0709
BrandRS PRO
£13.52
1 Bag of 50
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4mm M4 Stainless Steel A4 316 Plain Hex Socket Set - -
RS Stock No. 281-669
BrandRS PRO
£8.19
1 Box of 100
Box(es)
10mm M6 Steel - Black, Self-Colour Hex Socket Set - -
RS Stock No. 292-675
BrandRS PRO
£11.88
1 Bag of 50
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40mm M8 Nylon - Plain Hex Set Screw Hex
RS Stock No. 529-977
BrandRS PRO
£8.45
1 Box of 100
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8mm M5 Steel - Black, Self-Colour Hex Socket Set - -
RS Stock No. 527-583
BrandRS PRO
£13.17
1 Bag of 50
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30mm M10 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 527-599
BrandRS PRO
£15.66
1 Bag of 50
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40mm M10 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 525-773
BrandRS PRO
£4.62
1 Bag of 100
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6mm M4 Steel - Zinc plated & clear Passivated Hex Set Screw Hex
RS Stock No. 137-843
BrandRS PRO
£11.12
1 Bag of 25
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16mm M6 Stainless Steel A2 304 Plain Hex Socket Set - -
RS Stock No. 281-681
BrandRS PRO
£13.05
1 Box of 100
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10mm M10 Steel - Black, Self-Colour Hex Socket Set - -
RS Stock No. 137-837
BrandRS PRO
£9.47
1 Bag of 25
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12mm M6 Stainless Steel A2 304 Plain Hex Socket Set - -
RS Stock No. 137-736
BrandRS PRO
£8.46
1 Bag of 50
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12mm M3 Stainless Steel A2 304 Plain Hex Socket Set - -
RS Stock No. 520-239
BrandRS PRO
£21.39
1 Bag of 50
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40mm M8 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 137-809
BrandRS PRO
£8.67
1 Bag of 50
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12mm M5 Stainless Steel A2 304 - Hex Socket Set - -
RS Stock No. 520-021
BrandRS PRO
£9.98
1 Bag of 100
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16mm M4 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 520-194
BrandRS PRO
£11.27
1 Bag of 50
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16mm M8 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 520-065
BrandRS PRO
£9.49
1 Bag of 100
Bag(s)
12mm M5 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 529-955
BrandRS PRO
£15.75
1 Box of 100
Box(es)
12mm M4 Steel - Black, Self-Colour Hex Socket Set - -
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