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. Discover everything you need to know in our socket screws guide.

RS offer an extensive range of high-quality threaded fixings with standard metric threads and UNC (Unified National Coarse) thread.

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 - Socket cap screws have a head height equal to the shank diameter. They are 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.

What are the different types of materials available?

Our socket screws are available in a range of materials to suit every application and environment. They include;

  • Stainless Steel, including 316 and 304 grades
  • Steel
  • Brass
  • Titanium Alloy

When would I 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.

What are the 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 require 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 Standards Met Thread Pitch
RS Stock No. 183-8597
BrandRS PRO
kr 195,58
1 Box of 100
Box(es)
M3 8mm Hex Socket Button Stainless Steel A2 304 Plain Metric - 0.5mm
RS Stock No. 483-8124
BrandRS PRO
kr 369,21
1 Box of 100
Box(es)
M2.5 6mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 0.45mm
RS Stock No. 293-303
BrandRS PRO
kr 347,88
1 Bag of 50
Bag(s)
M2.5 4mm Hex Socket Cap Steel - Black, Self-Colour Metric DIN 912 0.45mm
RS Stock No. 293-280
BrandRS PRO
kr 352,56
1 Bag of 50
Bag(s)
M2 6mm Hex Socket Cap Steel - Black, Self-Colour Metric DIN 912 0.4mm
RS Stock No. 232-8164
BrandRS PRO
kr 109,04
1 Box of 50
Box(es)
M3 12mm Hex Socket Button Stainless Steel A4 316 Plain Metric ISO 7380 0.5mm
RS Stock No. 483-8203
BrandRS PRO
kr 198,95
1 Box of 100
Box(es)
M4 10mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 0.7mm
RS Stock No. 281-271
BrandRS PRO
kr 180,80
1 Box of 100
Box(es)
M5 16mm Hex Socket Button Steel - Black, Self-Colour Metric ISO 7380 0.8mm
RS Stock No. 281-013
BrandRS PRO
kr 232,76
1 Box of 50
Box(es)
M3 16mm Hex Socket Cap Stainless Steel A2 304 Plain Metric - 0.5mm
RS Stock No. 124-7269
BrandRS PRO
kr 184,60
1 Bag of 100
Bag(s)
M5 8mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 0.8mm
RS Stock No. 483-8130
BrandRS PRO
kr 332,45
1 Box of 100
Box(es)
M2.5 12mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 0.45mm
RS Stock No. 232-8158
BrandRS PRO
kr 105,13
1 Box of 50
Box(es)
M3 10mm Hex Socket Button Stainless Steel A4 316 Plain Metric ISO 7380 0.5mm
RS Stock No. 483-8326
BrandRS PRO
kr 243,03
1 Box of 100
Box(es)
M6 16mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 1mm
RS Stock No. 281-079
BrandRS PRO
kr 238,52
1 Box of 50
Box(es)
M5 12mm Hex Socket Cap Stainless Steel A2 304 Plain Metric - 0.8mm
RS Stock No. 281-372
BrandRS PRO
kr 186,44
1 Box of 100
Box(es)
M3 6mm Hex Socket Countersunk Steel - Black, Self-Colour Metric - 0.5mm
RS Stock No. 491-5243
BrandRS PRO
kr 232,61
1 Box of 100
Box(es)
M5 12mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 0.8mm
RS Stock No. 281-445
BrandRS PRO
kr 187,42
1 Box of 100
Box(es)
M4 16mm Hex Socket Countersunk Steel - Black, Self-Colour Metric DIN 7991 0.7mm
RS Stock No. 290-152
BrandRS PRO
kr 168,40
1 Box of 25
Box(es)
M8 40mm Hex Socket Cap Stainless Steel A2 304 Plain Metric - 1.25mm
RS Stock No. 280-981
BrandRS PRO
kr 189,05
1 Box of 50
Box(es)
M3 6mm Hex Socket Cap Stainless Steel A2 304 Plain Metric - 0.5mm
RS Stock No. 304-4615
BrandRS PRO
kr 308,31
1 Bag of 50
Bag(s)
M3 30mm Hex Socket Cap Stainless Steel A4 316 Plain Metric DIN 912 0.5mm
RS Stock No. 483-8275
BrandRS PRO
kr 247,98
1 Bag of 100
Bag(s)
M5 20mm Hex Socket Cap Steel - Bright Zinc Plated Metric DIN 912 0.8mm