Illustrative drawing. Actual product is confirmed to your specification at quotation.
Screws
Socket Head Cap Screws
Also listed as Socket Head Bolts
Socket head cap screws (SHCS) carry high loads in a small head diameter and can be recessed in a counterbore. The standard grade is 12.9, with stainless A2-70 and A4-80 versions. Also called socket head bolts.
- Standard class 12.9
- Hex key drive, recessed heads
- Metric and imperial
Specifications
- Material
- Carbon steelAlloy steelStainless steel A2 (AISI 304)Stainless steel A4 (AISI 316)
- Grade / property class
- 8.810.912.9A2-70A4-70A4-80
- Thread
- Metric coarse (ISO 261)Metric fine pitchUNC / UNF (imperial)
- Finish / coating
- Black oxideZinc platedPlain / brightZinc-flake coated (on request)
- Size range
- Up to M6M8–M12M14–M24M27–M48
- Standards
- ISO 4762DIN 912IS 2269ASME B18.3
Exact dimensions, lengths and availability are confirmed at quotation.
Applications
- Machine tools and tooling
- Dies and fixtures
- Robotics and automation
- Gearboxes and pumps
- Compact machinery
Technical reference
Socket head cap screw dimensions (ISO 4762)
| Thread | Pitch (mm) | Head diameter dk max (mm) | Head height k (mm) | Hex key s (mm) |
|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 3 | 2.5 |
| M4 | 0.7 | 7 | 4 | 3 |
| M5 | 0.8 | 8.5 | 5 | 4 |
| M6 | 1.0 | 10 | 6 | 5 |
| M8 | 1.25 | 13 | 8 | 6 |
| M10 | 1.5 | 16 | 10 | 8 |
| M12 | 1.75 | 18 | 12 | 10 |
| M16 | 2.0 | 24 | 16 | 14 |
| M20 | 2.5 | 30 | 20 | 17 |
| M24 | 3.0 | 36 | 24 | 19 |
Head diameter, head height and hex key size in mm. Head height equals the thread diameter.
Property classes of bolts and screws (ISO 898-1)
| Property class | Tensile strength Rm min (MPa) | Yield strength Re min (MPa) |
|---|---|---|
| 4.6 | 400 | 240 |
| 5.6 | 500 | 300 |
| 8.8 (up to M16) | 800 | 640 |
| 10.9 | 1040 | 940 |
| 12.9 | 1220 | 1100 |
Minimum tensile strength Rm and minimum yield / proof strength Re (or Rp0.2) in MPa. Class 8.8 shows the value for sizes up to M16; larger sizes have slightly higher values.
Related and complementary fasteners
Request a quote for Socket Head Cap Screws
Give us the size, grade, finish and quantity. We reply within one business day.
Common questions
- Which sizes and grades of socket head cap screws do you supply?
- We supply socket head cap screws in Up to M6, M8–M12, M14–M24, M27–M48 size bands and grades/classes including 8.8, 10.9, 12.9, A2-70, A4-70, A4-80. Exact availability, dimensions and lead time are confirmed at quotation.
- Which standards do socket head cap screws follow?
- Common standards are ISO 4762, DIN 912, IS 2269, ASME B18.3. Tell us the standard you need and we will quote to it.
- Can you supply in bulk or with test certificates?
- Yes. We quote for loose lots and scheduled bulk supply across India, and can share manufacturer test certificates where available. Confirm the requirement when you request a quote.
Need a quote on bulk or custom industrial supply?
Share your specifications and quantities — our technical team will respond with pricing and lead time within one business day.