DIN 912 — Metric Socket Head Cap Screws
Data sheet · Revision 03 · 2026-09-16
Dimensions & mechanical properties
| Thread nom | Pitch (mm) | A max (mm) | D max (mm) | H max (mm) | J nom (mm) | G min (mm) | T min (mm) | UTS min (MPa) | Tensile min (kN) | Tensile min (lbs.) | Shear min (kN) | Shear min (lbs.) | Torque** (N-m) | Torque** (in-lbs.) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 3.0 | 1.6 | 1.6 | 1.5 | 0.54 | 0.80 | 1300 | 1.65 | 370 | 1.57 | 352.5 | 0.29 | 2.6 |
| M2 | 0.40 | 3.8 | 2.0 | 2.0 | 1.5 | 0.68 | 1.0 | 1300 | 2.69 | 605 | 2.45 | 550 | 0.60 | 5.3 |
| M2.5 | 0.45 | 4.5 | 2.5 | 2.5 | 2.0 | 0.85 | 1.25 | 1300 | 4.41 | 990 | 3.83 | 860 | 1.21 | 11 |
| M3 | 0.5 | 5.5 | 3.0 | 3.0 | 2.5 | 1.02 | 1.5 | 1300 | 6.54 | 1,470 | 5.5 | 1240 | 2.1 | 19 |
| M4 | 0.7 | 7.0 | 4.0 | 4.0 | 3.0 | 1.52 | 2.0 | 1300 | 11.4 | 2,560 | 9.8 | 2,205 | 4.6 | 41 |
| M5 | 0.8 | 8.5 | 5.0 | 5.0 | 4.0 | 1.90 | 2.5 | 1300 | 18.5 | 4,160 | 15.3 | 3,445 | 9.5 | 85 |
| M6 | 1.0 | 10.0 | 6.0 | 6.0 | 5.0 | 2.28 | 3.0 | 1300 | 26.1 | 5,870 | 22.05 | 4,960 | 16 | 140 |
| M8 | 1.25 | 13.0 | 8.0 | 8.0 | 6.0 | 3.2 | 4.0 | 1300 | 47.6 | 10,700 | 39.2 | 8,800 | 39 | 350 |
| M10 | 1.5 | 16.0 | 10.0 | 10.0 | 8.0 | 4.0 | 5.0 | 1300 | 75.4 | 17,000 | 61 | 13,750 | 77 | 680 |
| M12 | 1.75 | 18.0 | 12.0 | 12.0 | 10.0 | 4.8 | 6.0 | 1300 | 110 | 24,700 | 88 | 19,850 | 135 | 1,200 |
| *(M14) | 2.0 | 21.0 | 14.0 | 14.0 | 12.0 | 5.6 | 7.0 | 1300 | 150 | 33,700 | 120 | 27,000 | 215 | 1,900 |
| M16 | 2.0 | 24.0 | 16.0 | 16.0 | 14.0 | 6.4 | 8.0 | 1300 | 204 | 45,900 | 157 | 35,250 | 330 | 2,900 |
| M20 | 2.5 | 30.0 | 20.0 | 20.0 | 17.0 | 8.0 | 10.0 | 1250 | 306 | 68,800 | 235.5 | 53,000 | 650 | 5,750 |
| M24 | 3.0 | 36.0 | 24.0 | 24.0 | 19.0 | 9.6 | 12.0 | 1250 | 441 | 99,100 | 339 | 76,500 | 1100 | 9,700 |
| *M30 | 3.5 | 45.0 | 30.0 | 30.0 | 22.0 | 12.0 | 15.0 | 1250 | 701 | 158,000 | 530 | 119,000 | 2250 | 19,900 |
| *M36 | 4.0 | 54.0 | 36.0 | 36.0 | 27.0 | 14.4 | 18.0 | 1250 | 1020 | 229,000 | 756 | 171,500 | 3850 | 34,100 |
| *M42 | 4.5 | 63.0 | 42.0 | 42.0 | 32.0 | 16.8 | 21.0 | 1250 | 1400 | 315,000 | 1040 | 233,500 | 6270 | 55,580 |
| *M48 | 5.0 | 72.0 | 48.0 | 48.0 | 36.0 | 19.2 | 24.0 | 1250 | 1840 | 413,000 | 1355 | 305,000 | 8560 | 75,800 |
Shear: Single shear strength of body
Shear: Single shear strength of body
Torque**: Recommended seating torque, plain finish
Torque**: Recommended seating torque, plain finish
Length tolerance
| Nominal length | M1.6-M10 (mm) | M12-M20 (mm) | over 20 (mm) |
|---|---|---|---|
| Up to 16 incl. | ±0.3 | ±0.3 | - |
| Over 16-50 incl. | ±0.4 | ±0.4 | ±0.7 |
| Over 50-120 incl. | ±0.7 | ±1.0 | ±1.5 |
| Over 120-200 incl. | ±1.0 | ±1.5 | ±2.0 |
| Over 200 | ±2.0 | ±2.5 | ±3.0 |
Body and Grip Lengths
| Nominal length nom (mm) | M1.6 LG max (mm) | M1.6 LB min (mm) | M2 LG max (mm) | M2 LB min (mm) | M2.5 LG max (mm) | M2.5 LB min (mm) | M3 LG max (mm) | M3 LB min (mm) | M4 LG max (mm) | M4 LB min (mm) | M5 LG max (mm) | M5 LB min (mm) | M6 LG max (mm) | M6 LB min (mm) | M8 LG max (mm) | M8 LB min (mm) | M10 LG max (mm) | M10 LB min (mm) | M12 LG max (mm) | M12 LB min (mm) | M14 LG max (mm) | M14 LB min (mm) | M16 LG max (mm) | M16 LB min (mm) | M20 LG max (mm) | M20 LB min (mm) | M24 LG max (mm) | M24 LB min (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20 | 4.8 | 3.0 | 4.0 | 2.0 | ||||||||||||||||||||||||
| 25 | 9.8 | 8.0 | 9.0 | 7.0 | 8.0 | 5.7 | 7.0 | 4.5 | ||||||||||||||||||||
| 30 | 14.8 | 13.0 | 14.0 | 12.0 | 13.0 | 10.7 | 12.0 | 9.5 | 10.0 | 6.5 | ||||||||||||||||||
| 35 | . . . | . . . | 19.0 | 17.0 | 18.0 | 15.7 | 17.0 | 14.5 | 15.0 | 11.5 | 13.0 | 9.0 | 11.0 | 6.0 | ||||||||||||||
| 40 | . . . | . . . | 24.0 | 22.0 | 23.0 | 20.7 | 22.0 | 19.5 | 20.0 | 16.5 | 18.0 | 14.0 | 16.0 | 11.0 | ||||||||||||||
| 45 | . . . | . . . | . . . | . . . | 28.0 | 25.7 | 27.0 | 24.5 | 25.0 | 21.5 | 23.0 | 19.0 | 21.0 | 16.0 | 17.0 | 10.7 | ||||||||||||
| 50 | . . . | . . . | . . . | . . . | 33.0 | 30.7 | 32.0 | 29.5 | 30.0 | 26.5 | 28.0 | 24.0 | 26.0 | 21.0 | 22.0 | 15.7 | 18.0 | 10.5 | ||||||||||
| 55 | . . . | . . . | . . . | . . . | . . . | . . . | 37.0 | 34.5 | 35.0 | 31.5 | 33.0 | 29.0 | 31.0 | 26.0 | 27.0 | 20.7 | 23.0 | 15.5 | ||||||||||
| 60 | . . . | . . . | . . . | . . . | . . . | . . . | 42.0 | 39.5 | 40.0 | 36.5 | 38.0 | 34.0 | 36.0 | 31.0 | 32.0 | 25.7 | 28.0 | 20.5 | 24.0 | 15.2 | ||||||||
| 65 | . . . | . . . | . . . | . . . | . . . | . . . | 47.0 | 44.5 | 45.0 | 41.5 | 43.0 | 39.0 | 41.0 | 36.0 | 37.0 | 30.7 | 33.0 | 25.5 | 29.0 | 20.2 | 25.0 | 15.0 | ||||||
| 70 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 50.0 | 46.5 | 48.0 | 44.0 | 46.0 | 41.0 | 42.0 | 35.7 | 38.0 | 30.5 | 34.0 | 25.2 | 30.0 | 20.0 | 26.0 | 16.0 | ||||
| 80 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 60.0 | 56.5 | 58.0 | 54.0 | 56.0 | 51.0 | 52.0 | 45.7 | 48.0 | 40.5 | 44.0 | 35.2 | 40.0 | 30.0 | 36.0 | 26.0 | ||||
| 90 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 68.0 | 64.0 | 66.0 | 61.0 | 62.0 | 55.7 | 58.0 | 50.5 | 54.0 | 45.2 | 50.0 | 40.0 | 46.0 | 36.0 | 38.0 | 25.5 | ||
| 100 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 78.0 | 74.0 | 76.0 | 71.0 | 72.0 | 65.7 | 68.0 | 60.5 | 64.0 | 55.2 | 60.0 | 50.0 | 56.0 | 46.0 | 48.0 | 35.5 | 40.0 | 25.0 |
| 110 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 86.0 | 81.0 | 82.0 | 75.7 | 78.0 | 70.5 | 74.0 | 65.2 | 70.0 | 60.0 | 66.0 | 56.0 | 58.0 | 45.5 | 50.0 | 35.0 |
| 120 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 96.0 | 91.0 | 92.0 | 85.7 | 88.0 | 80.5 | 84.0 | 75.2 | 80.0 | 70.0 | 76.0 | 66.0 | 68.0 | 55.5 | 60.0 | 45.0 |
| 130 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 102.0 | 95.7 | 98.0 | 90.5 | 94.0 | 85.2 | 90.0 | 80.0 | 86.0 | 76.0 | 78.0 | 65.5 | 70.0 | 55.0 |
| 140 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 112.0 | 105.7 | 108.0 | 100.5 | 104.0 | 95.2 | 100.0 | 90.0 | 96.0 | 86.0 | 88.0 | 75.5 | 80.0 | 65.0 |
| 150 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 122.0 | 115.7 | 118.0 | 110.5 | 114.0 | 105.2 | 110.0 | 100.0 | 106.0 | 96.0 | 98.0 | 85.5 | 90.0 | 75.0 |
| 160 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 132.0 | 125.7 | 128.0 | 120.5 | 124.0 | 115.2 | 120.0 | 110.0 | 116.0 | 106.0 | 108.0 | 95.5 | 100.0 | 85.0 |
| 180 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 148.0 | 140.5 | 144.0 | 135.2 | 140.0 | 130.0 | 136.0 | 126.0 | 128.0 | 115.5 | 120.0 | 105.0 |
| 200 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 168.0 | 160.5 | 164.0 | 155.2 | 160.0 | 150.0 | 156.0 | 146.0 | 148.0 | 135.5 | 140.0 | 125.0 |
| 220 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 184.0 | 175.2 | 180.0 | 170.0 | 176.0 | 166.0 | 168.0 | 155.5 | 160.0 | 145.0 |
| 240 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 204.0 | 195.2 | 200.0 | 190.0 | 196.0 | 186.0 | 188.0 | 175.5 | 180.0 | 165.0 |
| 260 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 220.0 | 210.0 | 216.0 | 206.0 | 208.0 | 195.5 | 200.0 | 185.0 |
| 300 | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | . . . | 256.0 | 246.0 | 248.0 | 235.5 | 240.0 | 225.0 |
M1.6 LG: Distance from bearing surface to first complete thread
M1.6 LB: Length of unthreaded cylindrical shank
M2 LG: Distance from bearing surface to first complete thread
M2 LB: Length of unthreaded cylindrical shank
M2.5 LG: Distance from bearing surface to first complete thread
M2.5 LB: Length of unthreaded cylindrical shank
M3 LG: Distance from bearing surface to first complete thread
M3 LB: Length of unthreaded cylindrical shank
M4 LG: Distance from bearing surface to first complete thread
M4 LB: Length of unthreaded cylindrical shank
M5 LG: Distance from bearing surface to first complete thread
M5 LB: Length of unthreaded cylindrical shank
M6 LG: Distance from bearing surface to first complete thread
M6 LB: Length of unthreaded cylindrical shank
M8 LG: Distance from bearing surface to first complete thread
M8 LB: Length of unthreaded cylindrical shank
M10 LG: Distance from bearing surface to first complete thread
M10 LB: Length of unthreaded cylindrical shank
M12 LG: Distance from bearing surface to first complete thread
M12 LB: Length of unthreaded cylindrical shank
M14 LG: Distance from bearing surface to first complete thread
M14 LB: Length of unthreaded cylindrical shank
M16 LG: Distance from bearing surface to first complete thread
M16 LB: Length of unthreaded cylindrical shank
M20 LG: Distance from bearing surface to first complete thread
M20 LB: Length of unthreaded cylindrical shank
M24 LG: Distance from bearing surface to first complete thread
M24 LB: Length of unthreaded cylindrical shank
Socket Head Cap Screws (Metric Series) per ASME/ANSI B18.3.1M-1986.
Notes
Hardness: Rc 38-43
Tensile stress: 1300 MPa thru M16; 1250 MPa over M16
Yield stress: 1170 MPa thru M16; 1125 MPa over M16
Thread Class: 4g 6g
All dimensions in millimeters. Sizes in brackets not preferred for new designs. * Non-stock diameter.
** Recommended seating torque, plain finish: calculated in accordance with VDI 2230, “Systematic Calculation of High Duty Bolted Joints,” to induce approximately 800 MPa stress in screw threads. Values are for plain screws. Additional torque conditions are unavailable; do not treat these values as universal installation torque.