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. 281-697
BrandRS PRO
£13.07
1 Box of 100
Box(es)
12mm M10 Steel - Black Oxide Hex Grub Screw Hex
RS Stock No. 281-675
BrandRS PRO
£10.17
1 Box of 100
Box(es)
10mm M8 Steel - Black, Self-Colour Hex Socket Set - -
RS Stock No. 292-653
BrandRS PRO
£11.21
1 Bag of 50
Bag(s)
25mm M8 Nylon - Plain Hex Set Screw Hex
RS Stock No. 137-815
BrandRS PRO
£7.60
1 Bag of 25
Bag(s)
6mm M6 Stainless Steel A2 304 - Hex Socket Set - -
RS Stock No. 483-2378
BrandRS PRO
£27.16
1 Bag of 100
Bag(s)
20mm M6 Brass - Plain Hex Set Screw Hex
RS Stock No. 917-2810
BrandRS PRO
£8.11
1 Bag of 100
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50mm M4 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 529-905
BrandRS PRO
£8.22
1 Box of 100
Box(es)
3mm M3 Steel - Black, Self-Colour Hex Socket Set - -
RS Stock No. 137-821
BrandRS PRO
£7.26
1 Bag of 25
Bag(s)
8mm M6 Stainless Steel A2 304 Plain Hex Socket Set - -
RS Stock No. 137-758
BrandRS PRO
£10.79
1 Bag of 50
Bag(s)
6mm M4 Stainless Steel A2 304 Plain Hex Socket Set - -
RS Stock No. 137-714
BrandRS PRO
£9.70
1 Bag of 50
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3mm M3 Stainless Steel A2 304 Plain Hex Socket Set - -
RS Stock No. 527-511
BrandRS PRO
£7.98
1 Bag of 50
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25mm M8 Steel - Zinc plated & clear Passivated Hex Set Screw Hex
RS Stock No. 483-2384
BrandRS PRO
£32.64
1 Bag of 100
Bag(s)
25mm M6 Brass - Plain Hex Set Screw Hex
RS Stock No. 520-223
BrandRS PRO
£16.96
1 Bag of 50
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30mm M8 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 483-2362
BrandRS PRO
£27.11
1 Bag of 100
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16mm M6 Brass - Plain Hex Set Screw Hex
RS Stock No. 525-874
BrandRS PRO
£7.71
1 Bag of 100
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20mm M6 Steel - Zinc plated & clear Passivated Hex Set Screw Hex
RS Stock No. 223-7181
BrandRS PRO
£27.45
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10mm M3 Ceramic - Plain Hex Set Screw Hex
RS Stock No. 292-748
BrandRS PRO
£11.79
1 Bag of 25
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20mm M12 Nylon - Plain Hex Set Screw Hex
RS Stock No. 529-911
BrandRS PRO
£9.72
1 Box of 100
Box(es)
6mm M3 Steel - Black, Self-Colour Hex Socket Set - -
RS Stock No. 520-217
BrandRS PRO
£16.09
1 Bag of 50
Bag(s)
25mm M8 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 431-965
BrandRS PRO
£11.17
1 Box of 25
Box(es)
3mm M2 Steel - Black, Self-Colour Hex Socket Set - -
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