DIN 912 Socket Head Cap Screws
Hexagon socket head cap screws per DIN 912 — current norm DIN EN ISO 4762 — running M1.6 to M64 in steel classes 8.8/10.9/12.9 or A2/A4 stainless, thread 6g. The cylindrical-head, internal-hex screw for high torque in tight clearance.
Last updated: 2026-11
Specifications
The socket head cap screw puts its drive inside the head: a cylindrical head with an internal hexagon takes higher torque than an external hexagon of the same head diameter, which is why it is the default where space is tight and clamp load matters. The collected standard table runs M1.6 through M64 in steel property classes 8.8, 10.9 and 12.9 or A2/A4 stainless, with thread tolerance 6g (5g6g on class 12.9). At M10 the head measures 16.00 mm across with a 10.00 mm head height, an 8 mm hex socket and a 5 mm minimum key engagement. Class 12.9 is the alloy-steel strength flagship — collected sources put minimum tensile at 180 ksi (≈1220 MPa), typically finished black oxide. The DIN 912 designation is superseded by DIN EN ISO 4762; order whichever your drawing calls out — see the ISO 4762 page for the ISO-designated route.
| Standard | DIN 912 — hexagon socket head cap screw; current norm DIN EN ISO 4762 |
|---|---|
| Size range | M1.6 – M64 |
| Dimensions at M10 | dk (head diameter) max 16.00 mm; k (head height) max 10.00 mm; s (hex socket) nominal 8 mm; t (key engagement) min 5 mm |
| Thread | 6g; 5g6g for strength class 12.9 |
| Strength classes | Steel 8.8, 10.9, 12.9; stainless A2, A4 |
| Class 12.9 build | Alloy steel, minimum tensile ≈1220 MPa (180 ksi), typically black oxide |
| Length (mm) | Weight kg/1000 pcs — M2 | Weight kg/1000 pcs — M2.5 | Weight kg/1000 pcs — M3 | Weight kg/1000 pcs — M4 | Weight kg/1000 pcs — M5 | Weight kg/1000 pcs — M6 | Weight kg/1000 pcs — M8 | Weight kg/1000 pcs — M10 | Weight kg/1000 pcs — M12 | Weight kg/1000 pcs — M14 | Weight kg/1000 pcs — M16 | Weight kg/1000 pcs — M18 | Weight kg/1000 pcs — M20 | Weight kg/1000 pcs — M22 | Weight kg/1000 pcs — M24 | Weight kg/1000 pcs — M30 | Weight kg/1000 pcs — M36 | Weight kg/1000 pcs — M48 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 0.155 | |||||||||||||||||
| 4 | 0.175 | 0.345 | ||||||||||||||||
| 5 | 0.195 | 0.375 | 0.7 | |||||||||||||||
| 6 | 0.215 | 0.405 | 0.7 | 1.5 | ||||||||||||||
| 8 | 0.255 | 0.465 | 0.8 | 1.7 | 2.5 | |||||||||||||
| 10 | 0.295 | 0.525 | 0.9 | 1.8 | 2.7 | 4.7 | ||||||||||||
| 12 | 0.355 | 0.585 | 1.0 | 2.0 | 3.0 | 5.1 | 10.9 | |||||||||||
| 16 | 0.415 | 0.705 | 1.2 | 2.3 | 3.5 | 5.8 | 12.1 | 20.9 | ||||||||||
| 20 | 0.495 | 0.825 | 1.4 | 2.7 | 4.0 | 6.5 | 13.4 | 22.9 | 32.1 | |||||||||
| 25 | 0.975 | 1.6 | 3.2 | 4.8 | 7.6 | 15.0 | 25.4 | 35.7 | 48 | 71.3 | ||||||||
| 30 | 1.9 | 3.7 | 5.6 | 8.3 | 16.9 | 27.9 | 39.3 | 53 | 77.8 | 111 | 128 | |||||||
| 35 | 4.2 | 6.3 | 9.9 | 18.9 | 30.4 | 42.9 | 58 | 84.4 | 120 | 139 | 211 | |||||||
| 40 | 4.7 | 7.1 | 11.0 | 20.9 | 32.9 | 46.5 | 63 | 91 | 129 | 150 | 224 | 270 | ||||||
| 45 | 7.9 | 12.1 | 22.9 | 36.1 | 50.1 | 68 | 97.6 | 138 | 161 | 237 | 285 | 500 | ||||||
| 50 | 8.6 | 13.2 | 24.9 | 39.3 | 54.5 | 73 | 106 | 147 | 172 | 250 | 300 | 527 | ||||||
| 55 | 14.3 | 26.9 | 42.5 | 58.9 | 78 | 114 | 156 | 183 | 263 | 316 | 554 | 870 | ||||||
| 60 | 15.4 | 28.9 | 45.7 | 63.4 | 84 | 122 | 165 | 194 | 276 | 330 | 581 | 910 | ||||||
| 65 | 31.0 | 48.9 | 67.8 | 90 | 130 | 174 | 205 | 291 | 345 | 608 | 950 | |||||||
| 70 | 33.0 | 52.1 | 71.3 | 96 | 138 | 183 | 216 | 306 | 363 | 635 | 990 | 2040 | ||||||
| 80 | 37.0 | 58.5 | 80.2 | 108 | 154 | 203 | 241 | 336 | 399 | 690 | 1070 | 2180 | ||||||
| 90 | 64.9 | 89.1 | 120 | 170 | 223 | 266 | 366 | 435 | 745 | 1150 | 2320 | |||||||
| 100 | 71.2 | 98.0 | 132 | 186 | 243 | 291 | 396 | 471 | 800 | 1230 | 2460 | |||||||
| 110 | 107.0 | 144 | 202 | 263 | 316 | 426 | 507 | 855 | 1310 | 2600 | ||||||||
| 120 | 116.0 | 156 | 218 | 283 | 341 | 456 | 543 | 910 | 1390 | 2740 | ||||||||
| 130 | 168 | 234 | 303 | 366 | 486 | 579 | 965 | 1470 | 2880 | |||||||||
| 140 | 180 | 250 | 323 | 391 | 516 | 615 | 1020 | 1550 | 3020 | |||||||||
| 150 | 266 | 343 | 416 | 546 | 651 | 1080 | 1630 | 3160 | ||||||||||
| 160 | 282 | 363 | 441 | 576 | 687 | 1130 | 1710 | 3300 | ||||||||||
| 180 | 403 | 491 | 636 | 759 | 1240 | 1870 | 3590 | |||||||||||
| 200 | 541 | 696 | 831 | 1350 | 2030 | 3870 | ||||||||||||
| 220 | 756 | 903 | 1460 | 2190 | 4150 | |||||||||||||
| 240 | 975 | 1570 | 2250 | 4430 | ||||||||||||||
| 260 | 1680 | 2410 | 4710 | |||||||||||||||
| 280 | 1790 | 2570 | 4990 | |||||||||||||||
| 300 | 1900 | 2730 | 5270 |
- Row 1 (3): Column alignment note (batch-level, anchored here): the 18 weight columns align one-to-one to the source header sizes (M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M30, M36, M48); verified against the rendered grid (rowspan/colspan expanded) and the monotone per-size weight progressions, not inferred from the flattened markup alone. The first grid row is a lone "Length" section label, carried as the first-column semantics.
Where this grade fits
Socket head cap screws ship in 12.9 as the default strength class, which puts them above the ~1000 MPa line where hydrogen embrittlement must be managed: prefer zinc flake or black oxide over electroplating, and require the bake where plating is unavoidable. For locking duty under these screws, the DIN 7980 high-collar lock washer is the variant made for the socket-head bearing face.
Deep read: Hydrogen Embrittlement in High-Strength Bolts: Which Grades Need Controls, Which Coatings and Baking Schedules Are Acceptable, and What to Require Before the RFQ · 8.8 vs 10.9 vs 12.9 Bolts: Strength, Hardness and Cost — What the Evidence Settles
Materials
- Steel
- Alloy steel
- Stainless steel
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (DIN 912 Socket Head Cap Screws) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
DIN 912 and ISO 4762 — which designation should I order?
They cover the same screw: the collected standard table states DIN 912's current norm is DIN EN ISO 4762, and the dimension table DIN 912 maps to is titled "according to ISO 4762" — identical columns from M1.6 to M64. The practical selection rule is the drawing: order the designation your documentation calls out, and confirm thread size, length and strength class against the order. The 12.9 class needs an internal hex key in good condition — a worn key rounds the socket before the screw reaches its torque.
What is the MOQ and lead time for these socket screws?
Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; non-stock diameters, lengths or finishes are quoted with a confirmed schedule. Common sizes in this designation are widely stocked — confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for these socket screws state?
State the standard designation (for example DIN 912, ISO 4762 or DIN 913), thread size and pitch, head or length dimension, strength class or stainless grade (such as 12.9, A2-70 or A4-80), finish (black oxide, zinc plated, or plain), required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
- 8.8 vs 10.9 vs 12.9 Bolts: Strength, Hardness and Cost — What the Evidence Settles
- Hydrogen Embrittlement in High-Strength Bolts: Which Grades Need Controls, Which Coatings and Baking Schedules Are Acceptable, and What to Require Before the RFQ
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support