Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
DIN 939 Studs Standard
Double End Studs with 1.25d Engagement Length for High-Temperature Flanged Connections
DIN 939 studs are double-end threaded fasteners where one end carries a longer thread engagement of 1.25 times the nominal diameter, designed specifically to grip firmly into tapped holes in flanges, valve bodies, and pressure equipment. Manufactured under EN 10269 material specifications, these studs retain mechanical strength and dimensional stability even when exposed to elevated temperatures and fluctuating thermal cycles. At Torqbolt, DIN 939 studs are produced from verified EN 10269 grades including 25CrMo4, 21CrMoV5-7, and similar alloy steels, ensuring consistent performance in demanding process plant environments. These studs are commonly paired with ISO 4032 nuts and used alongside DIN 2510 stud assemblies in high-pressure flanged joints across refineries, power stations, and chemical processing facilities.
DIN 939 Dimensions
| Size (d) | b1 | a | b | c | x1 | x2 | Shank Dia (Ds) | |
|---|---|---|---|---|---|---|---|---|
| Max | Min. | |||||||
| DIN 939 – M4 | 5 | 14 | 20 | – | 1,75 | 0,9 | 4 | 3.98 |
| DIN 939 – M5 | 6,5 | 16 | 22 | – | 2,0 | 1,0 | 5 | 4.98 |
| DIN 939 – M6 | 7,5 | 18 | 24 | – | 2,5 | 1,25 | 6 | 5.98 |
| DIN 939 – M7 | 9 | 20 | 26 | – | 2,5 | 1,25 | 7 | 6.97 |
| DIN 939 – M8 | 10 | 22 | 28 | – | 3,2 | 1,6 | 8 | 7.97 |
| DIN 939 – M10 | 12 | 26 | 32 | 45 | 3,8 | 1,9 | 10 | 9.97 |
| DIN 939 – M12 | 15 | 30 | 36 | 49 | 4,3 | 2,2 | 12 | 11.97 |
| DIN 939 – M14 | 18 | 34 | 40 | 53 | 5,0 | 2,5 | 14 | 13.97 |
| DIN 939 – M16 | 20 | 38 | 44 | 57 | 5,0 | 2,5 | 16 | 15.97 |
| DIN 939 – M18 | 22 | 42 | 48 | 61 | 6,3 | 3,2 | 18 | 17.97 |
| DIN 939 – M20 | 25 | 46 | 52 | 65 | 6,3 | 3,2 | 20 | 19.96 |
| DIN 939 – M22 | 28 | 50 | 56 | 69 | 6,3 | 3,2 | 22 | 21.96 |
| DIN 939 – M24 | 30 | 54 | 60 | 73 | 7,5 | 3,8 | 24 | 23.96 |
| DIN 939 – M27 | 35 | 60 | 66 | 79 | 7,5 | 3,8 | 27 | 26.96 |
| DIN 939 – M30 | 38 | 66 | 72 | 85 | 9,0 | 4,5 | 30 | 29.96 |
| DIN 939 – M33 | 42 | 72 | 78 | 91 | 9,0 | 4,5 | 33 | 32.95 |
| DIN 939 – M36 | 45 | 78 | 84 | 97 | 10,0 | 5,0 | 36 | 35.95 |
| DIN 939 – M39 | 50 | 84 | 90 | 103 | 10,0 | 5,0 | 39 | 38.95 |
| DIN 939 – M42 | 52 | 90 | 96 | 109 | 11,0 | 5,5 | 42 | 41.95 |
| DIN 939 – M45 | 58 | 96 | 102 | 115 | 11,0 | 5,5 | 45 | 44.95 |
| DIN 939 – M48 | 60 | 102 | 108 | 121 | 12,5 | 6,3 | 48 | 47.95 |
| DIN 939 – M52 | 65 | 110 | 116 | 129 | 12,5 | 6,3 | 52 | 51.95 |
DIN 939 Double End Stud Length Tolerance as per ISO 4759-1 Product Grade A IT13(h13)
| Nominal Dimension Range (mm) | JS15 Tolerance (± mm) |
|---|---|
| > 0 – 3 | ±0.12 |
| > 3 – 6 | ±0.16 |
| > 6 – 10 | ±0.20 |
| > 10 – 18 | ±0.26 |
| > 18 – 30 | ±0.32 |
| > 30 – 50 | ±0.40 |
| > 50 – 80 | ±0.50 |
| > 80 – 120 | ±0.63 |
| > 120 – 180 | ±0.80 |
| > 180 – 250 | ±1.00 |
| > 250 – 315 | ±1.25 |
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