GOST 7802-81 Increased Cup Head Square Shoulder Bolts, Product Grade C. Construction and Dimensions
GOST 7802-81 · Bolts
This is an informational translation of a Russian national standard. The Russian original is authoritative.
GOST 7802-81 applies to increased cup head square shoulder bolts, product grade C, with nominal thread diameter from 5 to 24 mm.
The construction and dimensions of the bolts shall conform to those shown in the drawing and in Tables 1 and 2.
| INCREASED CUP HEAD SQUARE SHOULDER BOLTS, PRODUCT GRADE C Construction and dimensions Increased cup head square shoulder bolts, product grade C. Construction and dimensions | GOST 7802-81* (ST SEV 2323-80) Supersedes GOST 7802-72 |
|---|
Example of a designation for a bolt with thread diameter d = 12 mm, coarse thread pitch, tolerance class 8g, length l = 60 mm, property class 3.6, with zinc coating 6 µm thick applied by cathodic reduction, chromated:
Bolt M12×60.36.016 GOST 7802-81
| Nominal thread diameter d | 5 | 6 | 8 | 10 | 12 | 16 | 20 | 24 | |
|---|---|---|---|---|---|---|---|---|---|
| Head diameter D | 11 | 14 | 18 | 23 | 28 | 35 | 44 | 52 | |
| Head height k | 2.5 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10.0 | 12.0 | |
| Sphere radius R » | 8 | 11 | 14 | 18 | 22 | 26 | 32 | 39 | |
| Size of square shoulder side V | 5 | 6 | 8 | 10 | 12 | 16 | 20 | 24 | |
| Shoulder height f, min | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 15 | |
| Thread length b | For l ≤ 120 | 16 | 18 | 22 | 26 | 30 | 38 | 46 | 54 |
| For l > 120 | - | - | - | 32 | 36 | 44 | 52 | 60 |
Thread — per GOST 24705-81, coarse pitch. Thread runout and incomplete thread — per GOST 27148-88. Bolt ends — per GOST 12414-66.
Radius under head — per GOST 24670-81.
Tolerances and methods for checking dimensions and deviations of form and location of surfaces — per GOST 1759.1-82. By agreement between the manufacturer and the customer, bolts may be made with thread tolerance class 6e.
Surface defects and inspection methods — per GOST 1759.2-82.
The diameter of the plain shank portion d₁ is approximately equal to the pitch diameter or the nominal thread diameter.
Technical requirements — per GOST 1759.0-87.
The mechanical properties of the bolts shall conform to property classes 3.6, 4.6, 4.8, 5.6, 5.8, 8.8.
The theoretical mass of bolts is given in the reference appendix.
| Bolt length l | Nominal thread diameter d | |||||||
|---|---|---|---|---|---|---|---|---|
| 5 | 6 | 8 | 10 | 12 | 16 | 20 | 24 | |
| 12 | - | - | - | - | - | - | ||
| 14 | - | - | - | - | - | |||
| 16 | - | - | - | - | ||||
| 20 | - | - | - | |||||
| 25 | - | |||||||
| 30 | - | |||||||
| 35 | - | |||||||
| 40 | - | |||||||
| 45 | - | |||||||
| 50 | - | |||||||
| 55 | - | |||||||
| 60 | - | |||||||
| 65 | - | |||||||
| 70 | - | |||||||
| 75 | - | |||||||
| 80 | - | |||||||
| 90 | - | |||||||
| 100 | - | |||||||
| 110 | - | - | ||||||
| 120 | - | - | ||||||
| 130 | - | - | ||||||
| 140 | - | - | ||||||
| 150 | - | - | ||||||
| 160 | - | - | ||||||
| 170 | - | - | ||||||
| 180 | - | - | ||||||
| 190 | - | - | ||||||
| 200 | - | - | ||||||
| 220 | - | - | ||||||
| 240 | - | - | - | |||||
| 260 | - | - | - | |||||
| Notes: 1. Bolts are manufactured with lengths between the bold lines. 2. Bolts in the range from the upper bold line to the dashed line are manufactured with thread along the full length of the shank. |
| Bolt length l, mm | Theoretical mass of 1000 pcs of bolts, kg, at nominal thread diameter d, mm | |||||||
|---|---|---|---|---|---|---|---|---|
| 5 | 6 | 8 | 10 | 12 | 16 | 20 | 24 | |
| 12 | 2.699 | 4.612 | - | - | - | - | - | - |
| 14 | 2.936 | 4.950 | 10.10 | - | - | - | - | - |
| 16 | 3.172 | 5.288 | 10.71 | 19.39 | - | - | - | - |
| 20 | 3.644 | 5.964 | 11.94 | 21.34 | 34.76 | - | - | - |
| 25 | 4.235 | 6.809 | 13.48 | 23.79 | 38.30 | 75.60 | 133.4 | - |
| 30 | 4.825 | 7.655 | 15.02 | 26.22 | 41.84 | 82.13 | 143.6 | - |
| 35 | 5.416 | 8.500 | 16.56 | 28.67 | 45.38 | 88.66 | 153.8 | - |
| 40 | 6.006 | 9.345 | 18.10 | 31.11 | 48.92 | 95.18 | 164.1 | - |
| 45 | 6.596 | 10.196 | 19.64 | 33.55 | 52.46 | 101.71 | 174.3 | - |
| 50 | 7.187 | 11.036 | 21.18 | 35.99 | 56.00 | 108.24 | 184.5 | - |
| 55 | 7.746 | 11.881 | 22.72 | 38.44 | 59.54 | 114.77 | 194.8 | - |
| 60 | 8.336 | 12.726 | 24.26 | 40.88 | 63.08 | 121.23 | 205.0 | - |
| 65 | 8.926 | 13.574 | 25.80 | 43.32 | 66.62 | 127.82 | 215.2 | - |
| 70 | 9.516 | 14.417 | 27.34 | 45.76 | 70.17 | 134.35 | 225.5 | - |
| 75 | - | 15.262 | 28.88 | 48.20 | 73.71 | 140.87 | 235.7 | 366.4 |
| 80 | - | 16.107 | 30.42 | 50.65 | 77.25 | 147.40 | 245.9 | 381.2 |
| 90 | - | 17.798 | 33.50 | 55.53 | 84.33 | 160.45 | 266.4 | 410.6 |
| 100 | - | 19.488 | 36.57 | 60.41 | 91.41 | 173.51 | 286.9 | 440.1 |
| 110 | - | - | 39.65 | 65.30 | 98.49 | 186.56 | 307.4 | 469.6 |
| 120 | - | - | 42.73 | 70.18 | 105.57 | 199.62 | 327.8 | 499.0 |
| 130 | - | - | 45.81 | 75.10 | 112.65 | 212.67 | 348.3 | 528.5 |
| 140 | - | - | 48.89 | 79.95 | 119.73 | 225.72 | 368.8 | 558.0 |
| 150 | - | - | 51.97 | 84.84 | 126.81 | 238.78 | 389.2 | 587.4 |
| 160 | - | - | 55.05 | 89.72 | 133.89 | 251.83 | 409.7 | 616.9 |
| 170 | - | - | 58.13 | 94.61 | 140.97 | 264.87 | 430.2 | 6 46.4 |
| 180 | - | - | 61.21 | 99.49 | 148.05 | 277.94 | 450.6 | 675.8 |
| 190 | - | - | 6 4 ,29 | 104.37 | 155.13 | 290.99 | 471.1 | 705.3 |
| 200 | - | - | 67.37 | 109.26 | 162.22 | 304.04 | 491.6 | 734.8 |
| 220 | - | - | 73.53 | 119.02 | 176.38 | 330.15 | 532.6 | 793.8 |
| 240 | - | - | - | 128.79 | 190.54 | 366.26 | 573.6 | 852.8 |
| 260 | - | - | - | 138.56 | 204.70 | 382.37 | 614.6 | 911.8 |
Corresponds to DIN 603, ISO 8677.
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