Socket Screws


Socket screws have a cylindrical head and an internal hex drive. They are used when externally wrenched fasteners are not practical because of a lack of space. Socket screws are tightened using an Allan or Hex key.
Head Shapes
• Hex Socket Button - has a larger head diameter making them more appropriate for holding thin materials such as sheet metal guards.
• Hex Socket Cap - has a head height equal to the shank diameter. Used instead of a hex bolt when there is less clearance available.
• Hex Socket Countersunk - used when you need a screw to fit flush or below the surface of your material
• Hex Socket Shoulder - often used as a pivot point or axis because shoulders are ground to a tight tolerance. They feature a small cylindrical head with tall vertical sides.
When to use a Socket Screw
Socket screws are often used in applications where there is limited clearance such as in machine building and maintenance, tools and dies and engineering applications.
Advantages of using a Socket Screw
• As compared to ordinary fasteners, fewer socket screws of the same size can achieve the same clamping force in a joint.
• As fewer screws are required for a given job, fewer holes are required to be drilled and tapped.
• There is weight reduction as fewer screws are used.
• There are weight reductions due to the smaller size of the component parts. The cylindrical heads of socket screws need less space than hex heads and require no additional wrench space.

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Description Price Thread Size Length Head Shape Material Stainless Steel Type Finish Thread Type Thread Pitch
RS Stock No. 376-4814
Mfr. Part No.HK76176
BrandHolo-Krome
£13.57
1 Box of 100
Box(es)
M6 25mm Hex Socket Cap Steel - Black, Self-Colour Metric -
RS Stock No. 376-3962
Mfr. Part No.HK72018
BrandHolo-Krome
£15.43
1 Box of 50
Box(es)
No 4 6mm Hex Socket Cap Steel - Black, Self-Colour UNC 40mm
RS Stock No. 376-4836
Mfr. Part No.HK76168
BrandHolo-Krome
£12.95
1 Box of 100
Box(es)
M6 16mm Hex Socket Cap Steel - Black, Self-Colour Metric -
RS Stock No. 376-3978
Mfr. Part No.HK72046
BrandHolo-Krome
£17.79
1 Box of 50
Box(es)
No 6 19mm Hex Socket Cap Steel - Black, Self-Colour UNC 32mm
RS Stock No. 376-4842
Mfr. Part No.HK76236
BrandHolo-Krome
£21.95
1 Box of 100
Box(es)
M8 20mm Hex Socket Cap Steel - Black, Self-Colour Metric -
RS Stock No. 376-3956
Mfr. Part No.HK72022
BrandHolo-Krome
£16.82
1 Box of 50
Box(es)
No 4 13mm Hex Socket Cap Steel - Black, Self-Colour UNC 40mm
RS Stock No. 376-4892
Mfr. Part No.HK76240
BrandHolo-Krome
£22.68
1 Box of 100
Box(es)
M8 25mm Hex Socket Cap Steel - Black, Self-Colour Metric -
RS Stock No. 376-4634
Mfr. Part No.HK76060
BrandHolo-Krome
£13.02
1 Box of 100
Box(es)
M4 10mm Hex Socket Cap Steel - Black, Self-Colour Metric 0.7mm
RS Stock No. 376-4757
Mfr. Part No.HK76124
BrandHolo-Krome
£13.07
1 Box of 100
Box(es)
M5 20mm Hex Socket Cap Steel - Black, Self-Colour Metric -
RS Stock No. 376-4628
Mfr. Part No.HK76016
BrandHolo-Krome
£12.20
1 Box of 100
Box(es)
M3 10mm Hex Socket Cap Steel - Black, Self-Colour Metric 0.5mm
RS Stock No. 376-4561
Mfr. Part No.HK76662
BrandHolo-Krome
£24.16
1 Box of 100
Box(es)
M2.5 12mm Hex Socket Cap Steel - Black, Self-Colour Metric 0.45mm
RS Stock No. 376-4577
Mfr. Part No.HK76012
BrandHolo-Krome
£11.10
1 Box of 100
Box(es)
M3 8mm Hex Socket Cap Steel - Black, Self-Colour Metric 0.5mm
RS Stock No. 376-4555
Mfr. Part No.HK76656
BrandHolo-Krome
£22.34
1 Box of 100
Box(es)
M2.5 6mm Hex Socket Cap Steel - Black, Self-Colour Metric 0.45mm
RS Stock No. 376-4331
Mfr. Part No.HK72060
BrandHolo-Krome
£15.43
1 Box of 50
Box(es)
No 8 19mm Hex Socket Cap Steel - Black, Self-Colour UNC 32mm
RS Stock No. 376-3940
Mfr. Part No.HK72026
BrandHolo-Krome
£18.33
1 Box of 50
Box(es)
No 4 19mm Hex Socket Cap Steel - Black, Self-Colour UNC 40mm
RS Stock No. 376-3990
Mfr. Part No.HK72042
BrandHolo-Krome
£14.94
1 Box of 50
Box(es)
No 6 13mm Hex Socket Cap Steel - Black, Self-Colour UNC 32mm
RS Stock No. 376-4690
Mfr. Part No.HK76064
BrandHolo-Krome
£13.07
1 Box of 100
Box(es)
M4 12mm Hex Socket Cap Steel - Black, Self-Colour Metric 0.7mm
RS Stock No. 376-4785
Mfr. Part No.HK76196
BrandHolo-Krome
£23.02
1 Box of 100
Box(es)
M6 50mm Hex Socket Cap Steel - Black, Self-Colour Metric -
RS Stock No. 376-4353
Mfr. Part No.HK72054
BrandHolo-Krome
£13.64
1 Box of 50
Box(es)
No 8 10mm Hex Socket Cap Steel - Black, Self-Colour UNC 32mm
RS Stock No. 376-4808
Mfr. Part No.HK76180
BrandHolo-Krome
£14.30
1 Box of 100
Box(es)
M6 30mm Hex Socket Cap Steel - Black, Self-Colour Metric -