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. 276-257
BrandRS PRO
£21.38
1 Bag of 25
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35mm M16 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 276-314
BrandRS PRO
£22.98
1 Bag of 10
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80mm M16 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 276-673
BrandRS PRO
£60.07
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60mm M16 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 917-3040
BrandRS PRO
£23.33
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120mm M16 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 917-2895
BrandRS PRO
£10.00
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75mm M8 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 917-2823
BrandRS PRO
£5.72
1 Bag of 50
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35mm M5 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 276-730
BrandRS PRO
£35.86
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70mm M20 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 917-2882
BrandRS PRO
£11.02
1 Bag of 25
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65mm M8 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 917-3071
BrandRS PRO
£29.99
1 Bag of 10
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130mm M20 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 276-651
BrandRS PRO
£50.15
1 Bag of 25
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45mm M16 Stainless Steel A2 304 Plain Hex Set Screw Hex
RS Stock No. 917-2870
BrandRS PRO
£10.95
1 Bag of 50
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55mm M8 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 525-802
BrandRS PRO
£4.48
1 Bag of 100
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16mm M4 Steel - Zinc plated & clear Passivated Hex Set Screw Hex
RS Stock No. 187-0759
BrandRS PRO
£9.58
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10mm M5 Stainless Steel A4 316 Plain Hex Socket Set - -
RS Stock No. 917-2858
BrandRS PRO
£10.01
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80mm M6 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 530-157
BrandRS PRO
£17.50
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20mm M12 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 917-2911
BrandRS PRO
£15.89
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45mm M10 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 276-279
BrandRS PRO
£24.07
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45mm M16 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 276-336
BrandRS PRO
£43.74
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50mm M20 Steel - Clear Passivated, Zinc Hex Set Screw Hex
RS Stock No. 917-3037
BrandRS PRO
£20.83
1 Bag of 10
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90mm M16 Steel - Zinc Plated Hex Set Screw Hex
RS Stock No. 917-3075
BrandRS PRO
£31.27
1 Bag of 10
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150mm M20 Steel - Zinc Plated Hex Set Screw Hex
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