Fastener Standard Spec Directory
Look up a spec by DIN standard × diameter × strength class. Every entry carries the dimension table, mechanical properties, recommended tightening torque, finish options and the DIN / GB / ISO cross reference.
How to read this directory
Pick the standard (DIN933 / DIN912 / DIN934), then cross the diameter row with the strength-class column to reach the spec page. Verify the standard number against the DIN / GB / ISO table below — similar names are not interchangeable (a flange nut and a type 1 hex nut in the same size have different widths across flats).
The full torque methodology and its influencing factors are on the technical parameters page; drawings and test reports are on the download page.
DIN933 Hex Bolt (Full Thread)
DIN 933 · GB/T 5783 · ISO 4017（半牙对应 DIN 931 · GB/T 5782 · ISO 4014）
Length & thread range: 10 – 500 mm, all lengths available; non-standard lengths and fine pitches to drawing
DIN912 Socket Head Cap Screw
DIN 912 · GB/T 70.1 · ISO 4762
Length & thread range: 10 – 500 mm, all lengths available; non-standard lengths and fine pitches to drawing
DIN934 Hex Nut
DIN 934 · GB/T 6170 · ISO 4032（2 型对应 GB/T 6175 / ISO 4033）
Length & thread range: Nuts have no length parameter — thickness m governs; type 2 is about 1.2× the type 1 thickness
DIN / GB / ISO cross reference
Always match on the standard number, not on the product name: similar names can differ in width across flats.
| Product | DIN | GB | ISO |
|---|---|---|---|
| Hex bolt, full thread | DIN 933 | GB/T 5783 | ISO 4017 |
| Hex bolt, partial thread | DIN 931 | GB/T 5782 | ISO 4014 |
| Socket head cap screw | DIN 912 | GB/T 70.1 | ISO 4762 |
| Hex flange bolt | DIN 6921 | GB/T 5787 | ISO 15072 |
| Hex bolt, narrow shank series B | DIN 961 | GB/T 5784 | ISO 8765 |
| Round head square neck bolt (carriage bolt) | DIN 603 | GB/T 12 | — |
| Hex nut type 1, coarse thread | DIN 934 | GB/T 6170 | ISO 4032 |
| Hex nut type 2, coarse thread | DIN 934（加厚） | GB/T 6175 | ISO 4033 |
| Hex nut type 1, fine thread | DIN 934M（细牙） | GB/T 6176 | ISO 8673 |
| Hex flange nut | DIN 6923 | GB/T 6177 | ISO 4161 |
| Nylon insert lock nut | DIN 985 | GB/T 889 | ISO 10511 |
| Acorn / dome nut | DIN 1587 | GB/T 923 | — |
Recommended tightening torque (M6–M24)
Coarse thread, dry assembly, friction coefficient μ ≈ 0.14, estimated at 70% of yield. Reference only — critical joints follow the torque given in the design document.
| Size | Pitch | Class 8.8 | Class 10.9 | A2-70 stainless |
|---|---|---|---|---|
| M6 | 1.0 | 10 N·m | 14 N·m | 7 N·m |
| M8 | 1.25 | 25 N·m | 35 N·m | 17 N·m |
| M10 | 1.5 | 50 N·m | 70 N·m | 33 N·m |
| M12 | 1.75 | 85 N·m | 120 N·m | 58 N·m |
| M14 | 2.0 | 135 N·m | 190 N·m | 93 N·m |
| M16 | 2.0 | 210 N·m | 295 N·m | 145 N·m |
| M20 | 2.5 | 425 N·m | 590 N·m | 290 N·m |
| M24 | 3.0 | 730 N·m | 1000 N·m | 500 N·m |
No published torque for class 12.9 or A4-80 — please confirm by phone. Spec pages list sourced values only.
Nuts carry no separate torque: control by the mating bolt class and internal proof load.
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Tell us the standard, diameter, class and quantity — quotation and lead time within 24 hours. Non-standard lengths, fine and left-hand threads made to drawing.