DIN 931 and ISO 4014 hexagon bolts carry a plain shank under the head and a thread length that depends on nominal length (b = 2d + 6 mm up to 125 mm long, 2d + 12 mm to 200 mm, 2d + 25 mm above). The unthreaded shank is used where the joint is loaded in shear or where the clamp length is long and thread in the bearing area is undesirable. Property class 8.8 is standard; 10.9 for high-strength structural and machine joints; stainless A2 and A4 for corrosive service; hot-dip galvanised to ISO 10684 for outdoor structural work. The finder groups the catalogue by thread diameter, then by length, with one column per material and finish.
Check that the plain shank does not extend into the nut: the thread length b must exceed the sum of washer, nut height and any projection beyond the nut (at least two threads visible). ISO 4014 heads for M10, M12, M14 and M22 have across-flats of 16, 18, 21 and 34 mm; DIN 931 heads for the same sizes are 17, 19, 22 and 32 mm. Where a fully threaded screw is acceptable, DIN 933 / ISO 4017 offers more length steps in small sizes; see the companion finder.
Coverage: 7,914 catalogue rows with a readable rating, of 18,458 in these categories. Each cell lists up to 2 part numbers per column; click a part number for the product page and a quotation.
| Thread × length | Steel 8.8 zinc-plated | Steel 8.8 plain / other finish | Steel 10.9 / 12.9 | Steel 4.6–6.8 / other | Hot-dip galvanised | Stainless A2 | Stainless A4 |
|---|---|---|---|---|---|---|---|
| M3 × 20 | — | 931803020 | — | — | — | — | — |
| M3 × 30 | 9318030301 | 931803030 | — | — | — | 4014A20303070 | — |
| M3 × 35 | 9318030351 | — | — | — | — | — | — |
| M3 × 40 | 9318030401 9318030401SST072-SCH | 931803040 931803040I | — | — | — | — | — |
| M3 × 45 | — | 931803045 | — | — | — | — | — |
| Thread × length | Steel 8.8 zinc-plated | Steel 8.8 plain / other finish | Steel 10.9 / 12.9 | Steel 4.6–6.8 / other | Hot-dip galvanised | Stainless A2 | Stainless A4 |
|---|---|---|---|---|---|---|---|
| M4 × 16 | 931804016ZNF105 | — | — | 93156040161 | — | — | — |
| M4 × 25 | 4014040252 9318040251 | 931804025 | — | — | — | 4014A20402570 | 4014A04025704 4014A40402570 |
| M4 × 30 | 9318040301 9318040303 | 931804030 | — | 931B04030 | — | — | — |
| M4 × 35 | 4014040352 9318040351 | 4014040351 931804035 | — | — | — | — | — |
| M4 × 40 | 4014040402 9318040401 | 4014040401 931804040 | — | — | — | — | — |
| M4 × 45 | 9318040451 931804045ZNF105 | 931804045 | — | 931B04045 | — | — | — |
| M4 × 50 | 9318040501 9318040501SST072-SCH | 931804050 931804050I | — | — | — | — | 4014A40405080 |
| M4 × 55 | 9318040551 931804055ZNF105 | 931804055 | — | — | — | — | — |
| M4 × 60 | 9318040601 | 931804060 931804060I | — | — | — | — | — |
| M4 × 65 | 9318040651 | — | — | — | — | — | — |
| M4 × 70 | 9318040701 931804070ZNF105 | 931804070 | — | — | — | 4014A20407070 | — |
| M4 × 75 | 40148040751 | 931804075 | — | — | — | — | — |
| M4 × 80 | 9318040801 | — | — | — | — | — | — |
| Thread × length | Steel 8.8 zinc-plated | Steel 8.8 plain / other finish | Steel 10.9 / 12.9 | Steel 4.6–6.8 / other | Hot-dip galvanised | Stainless A2 | Stainless A4 |
|---|---|---|---|---|---|---|---|
| M7 × 25 | — | 931807025 | — | — | — | — | — |
| M7 × 30 | 9318070301 | 931807030 | — | — | — | — | — |
| M7 × 35 | 9318070351 | 931807035 | — | — | — | — | — |
| M7 × 40 | 4014070402 9318070401 | 931807040 | — | — | — | — | — |
| M7 × 45 | 9318070451 | 931807045 | — | — | — | — | — |
| M7 × 50 | 4014070502 9318070501 | 931807050 | — | — | — | — | — |
| M7 × 55 | 9318070551 | — | 9311007055 | — | — | — | — |
| M7 × 60 | 9318070601 9318070601SST096 | 931807060 | — | — | — | — | — |
| M7 × 70 | — | 931807070 | — | — | — | — | — |
| M7 × 80 | 9318070801 | 931807080 | — | — | — | — | — |
Part numbers and designations are those of the original manufacturers and are given for identification. cBallast is an independent supplier; confirm ratings against the nameplate of the installed equipment before ordering. Table generated from the cBallast catalogue on 2026-09-29.