GOST 17473-80 Round Head Screws, Product Grades A and B. Design and Dimensions
GOST 17473-80 · Screws
This is an informational translation of a Russian national standard. The Russian original is authoritative.
This GOST applies to socket head cap screws with thread diameters from 3 to 36 mm.
| HEXAGON SOCKET HEAD CAP SCREWS, PRODUCT GRADE A Construction and dimensions Hexagona socket head cap screws, accuracy class A. Construction and dimensions | GOST 11738-84 (ISO 4762-77) |
|---|
Effective date 01.01.85
The standard fully complies with ST SEV 2662-80. The standard complies with the international standard ISO 4762-77, except for the tolerances of the width across flats.
Design and dimensions
The construction and dimensions of the screws shall conform to those shown in the drawing and table.
mm
| Nominal thread diameter d | 3 | 4 | 5 | 6 | 8 | 10 | 12 | (14) | 16 | (18) | 20 | (22) | 24 | (27) | 30 | (33) | 36 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shank diameter d₁ | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 |
| Head diameter D | 5.5 | 7.0 | 8.5 | 10.0 | 13.0 | 16.0 | 18.0 | 21.0 | 24.0 | 27.0 | 30.0 | 33.0 | 36.0 | 40.0 | 45.0 | 50.0 | 54.0 |
| Chamfer diameter D₁ (tolerance per Js17) | 3.2 | 3.8 | 4.9 | 6.1 | 7.2 | 9.7 | 12.0 | 14.3 | 16.7 | 16.7 | 20.4 | 20.4 | 22.7 | 22.7 | 26.2 | 28.5 | 32.0 |
| Head height k | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | 27 | 30 | 33 | 36 |
| Width across flats S (tolerance per D11) | 2.5 | 3.0 | 4.0 | 5.0 | 6.0 | 8.0 | 10.0 | 12.0 | 14.0 | 14.0 | 17.0 | 17.0 | 19.0 | 19.0 | 22.0 | 24.0 | 27.0 |
| Circumscribed circle diameter e, min | 2.87 | 3.44 | 4.59 | 5.73 | 6.87 | 9.17 | 11.45 | 13.74 | 16.02 | 16.02 | 19.44 | 19.44 | 21.73 | 21.73 | 25.15 | 27.43 | 30.85 |
| Head base thickness w, min | 1.15 | 1.4 | 1.9 | 2.3 | 3.0 | 4.0 | 4.8 | 5.8 | 6.8 | 7.8 | 8.6 | 9.4 | 10.4 | 11.9 | 12.9 | 13.8 | 15.3 |
| Hex socket depth t, min | 1.3 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 | 6.0 | 7.0 | 8.0 | 9.0 | 10.0 | 11.0 | 12.0 | 13.5 | 15.5 | 17.5 | 19.0 |
| Head-to-shank transition length f, max | 0.51 | 0.60 | 0.60 | 0.68 | 1.02 | 1.02 | 1.87 | 1.87 | 1.87’ | 1.87 | 2.04 | 2.04 | 2.04 | 2.89 | 2.89 | 2.89 | 2.89 |
| Radius under head R, min | 0.1 | 0.2 | 0.2 | 0.25 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 1.0 | 1.0 | 1.0 | 1.0 |
| Bearing surface inner diameter da, max | 3.6 | 4.7 | 5.7 | 6.8 | 9.2 | 11.2 | 14.2 | 16.2 | 18.2 | 20.2 | 22.4 | 24.4 | 26.4 | 30.4 | 33.4 | 36.4 | 39.4 |
| Bearing surface outer diameter dw, min | 5.07 | 6.53 | 8.03 | 9.38 | 12.33 | 15.33 | 17.23 | 20.17 | 23.17 | 26.02 | 28.87 | 31.85 | 34.81 | 38.72 | 43.61 | 48.62 | 52.54 |
| Chamfer c | 0.5 | 0.5 | 1.0 | 1.0 | 1.6 | 1.6 | 1.6 | 2.0 | 2.0 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 3.0 |
| Chamfer c₁ or radius R₁, max | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 | 2.2 | 2.4 | 2.7 | 3.0 | 3.3 | 3.6 |
| Thread length b | 18 | 20 | 22 | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | 66 | 72 | 78 | 84 |
Continued
mm
| Nominal thread diameter d | 3 | 4 | 5 | 6 | 8 | 10 | 12 | (14) | 16 | (18) | 20 | (22) | 24 | (27) | 30 | (33) | 36 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shank length l | 5 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| 6 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |||
| 8 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||||
| 10 | - | - | - | - | - | - | - | - | - | - | - | - | - | |||||
| 12 | - | - | - | - | - | - | - | - | - | - | - | |||||||
| 14 | - | - | - | - | - | - | - | - | - | - | - | |||||||
| 16 | - | - | - | - | - | - | - | - | - | - | - | |||||||
| 20 | - | - | - | - | - | - | - | - | - | - | ||||||||
| 25 | - | - | - | - | - | - | - | - | ||||||||||
| 30 | - | - | - | - | - | - | ||||||||||||
| 35 | - | - | - | - | - | - | ||||||||||||
| 40 | - | - | - | - | ||||||||||||||
| 45 | - | - | - | - | ||||||||||||||
| 50 | - | - | - | |||||||||||||||
| 55 | - | - | - | |||||||||||||||
| 60 | - | - | - | |||||||||||||||
| 65 | - | - | - | - | ||||||||||||||
| 70 | - | - | - | - | Standard sizes | |||||||||||||
| 75 | - | - | - | - | ||||||||||||||
| 80 | - | - | - | - | ||||||||||||||
| 90 | - | - | - | - | - | |||||||||||||
| 100 | - | - | - | - | - | |||||||||||||
| 110 | - | - | - | - | - | - | ||||||||||||
| 120 | - | - | - | - | - | - | ||||||||||||
| 130 | - | - | - | - | - | - | ||||||||||||
| 140 | - | - | - | - | - | - | - | |||||||||||
| 150 | - | - | - | - | - | - | - | - | ||||||||||
| 160 | - | - | - | - | - | - | - | - | ||||||||||
| 170 | - | - | - | - | - | - | - | - | - | - | ||||||||
| 180 | - | - | - | - | - | - | - | - | - | - | ||||||||
| 190 | - | - | - | - | - | - | - | - | - | - | ||||||||
| 200 | - | - | - | - | - | - | - | - | - | - |
Notes:
- Screws with thread diameters shown in brackets are not recommended for use.
- Screws with lengths shown above the dashed line shall be manufactured with thread over the full length of the shank.
Example of designation for a screw with thread diameter d = 12 mm, thread tolerance class 6g, length l = 40 mm, property class 6.8, without coating:
Screw M12-6g×40.68 GOST 11738-84
Same, property class 10.9, made of steel grade 30KhGSA, with oil-impregnated oxide coating:
Screw M12-6g×40.109.30KhGSA.05 GOST 11738-84
Technical requirements
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Thread — per GOST 24705; thread runout and incomplete thread — normal, per GOST 27148.
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Tolerances and methods for inspecting dimensions and form and position deviations of surfaces — per GOST 1759.1.
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Surface defects and inspection methods — per GOST 1759.2.
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Screws may be manufactured with the diameter of the plain part of the shank d₁ equal to the shank diameter for rolling metric thread, per GOST 19256.
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The chamfer or rounding of the bearing plane of the head shall extend to diameter dw.
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The shape of the bottom of the hex socket is arbitrary.
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The mechanical properties of the screws shall conform to property classes 8.8 and 12.9. Screws may be manufactured with mechanical properties conforming to property classes 5.6, 6.8, and 10.9.
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Screws shall be manufactured with the following coatings: chromated zinc, chromated cadmium, oil-impregnated oxide, or uncoated.
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Other technical requirements — per GOST 1759.0.
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The theoretical mass of screws is given in the appendix.
Theoretical mass of screws
| l, mm | Mass of 1000 pcs. of screws, kg ≈, for d, mm | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 4 | 5 | 6 | 8 | 10 | 12 | (14) | 16 | (18) | 20 | (22) | 24 | (27) | 30 | 33 | 36 | |
| 5 | 0.72 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 6 | 0.76 | 1.54 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 8 | 0.85 | 1.70 | 2.90 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 10 | 0.94 | 1.85 | 3.15 | 4.90 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 12 | 1.03 | 2.01 | 3.39 | 5.25 | 10.99 | - | - | - | - | - | - | - | - | - | - | - | - |
| 14 | 1.11 | 2.16 | 3.64 | 5.60 | 11.63 | 20.40 | - | - | - | - | - | - | - | - | - | - | - |
| 16 | 1.20 | 2.31 | 3.89 | 5.96 | 12.26 | 21.40 | - | - | - | - | - | - | - | - | - | - | - |
| 20 | 1.38 | 2.63 | 4.38 | 6.66 | 13.54 | 23.51 | 34.16 | - | - | - | - | - | - | - | - | - | - |
| 25 | 1.68 | 3.01 | 5.00 | 7.54 | 15.13 | 25.92 | 37.80 | 55.57 | 78.90 | - | - | - | - | - | - | - | - |
| 30 | 1.96 | 3.61 | 5.86 | 8.42 | 16.72 | 28.43 | 41.43 | 60.54 | 85.56 | 117.07 | 152.62 | - | - | - | - | - | - |
| 35 | - | 4.10 | 6.63 | 9.81 | 18.31 | 30.94 | 45.07 | 65.51 | 92.22 | 125.33 | 163.03 | 213.60 | 265.87 | - | - | - | - |
| 40 | - | 4.60 | 7.40 | 10.92 | 20.82 | 33.45 | 48.71 | 70.48 | 98.88 | 133.60 | 173.43 | 226.40 | 280.85 | 384.92 | - | - | - |
| 45 | - | - | 8.17 | 12.03 | 22.79 | 37.44 | 52.34 | 75.45 | 105.54 | 141.86 | 183.84 | 239.19 | 295.83 | 404.26 | 535.24 | - | - |
| 50 | - | - | 8.94 | 13.13 | 24.76 | 40.52 | 58.22 | 80.42 | 112.20 | 150.12 | 194.24 | 251.98 | 310.82 | 423.59 | 558.92 | 729.15 | - |
| 55 | - | - | - | 14.24 | 26.73 | 43.60 | 62.66 | 85.39 | 118.86 | 158.38 | 204.64 | 264.77 | 325.80 | 442.93 | 582.61 | 758.24 | 928.82 |
| 60 | - | - | - | 15.35 | 28.70 | 46.69 | 67.10 | 94.64 | 129.45 | 166.65 | 215.05 | 277.57 | 340.78 | 461.11 | 606.29 | 787.33 | 963.20 |
| 65 | - | - | - | - | 30.68 | 49.77 | 71.53 | 100.67 | 137.34 | 180.76 | 230.45 | 290.36 | 355.76 | 481.60 | 629.98 | 816.42 | 997.57 |
| 70 | - | - | - | - | 32.65 | 52.85 | 75.97 | 106.71 | 145.22 | 190.74 | 242.77 | 303.15 | 370.74 | 500.94 | 653.67 | 845.51 | 1031.95 |
| 75 | - | - | - | - | 34.62 | 55.93 | 80.41 | 112.75 | 153.11 | 200.72 | 255.09 | 324.00 | 385.72 | 520.27 | 677.36 | 874.60 | 1066.80 |
| 80 | - | - | - | - | 36.59 | 59.01 | 84.84 | 118.79 | 161.00 | 210.71 | 267.42 | 338.91 | 400.70 | 539.61 | 701.04 | 903.69 | 1100.71 |
| 90 | - | - | - | - | - | 65.17 | 93.72 | 130.87 | 176.77 | 230.67 | 292.07 | 368.74 | 447.26 | 578.28 | 748.42 | 961.87 | 1169.46 |
| 100 | - | - | - | - | - | 71.33 | 102.59 | 142.95 | 192.55 | 250.64 | 316.72 | 398.56 | 482.76 | 638.21 | 818.43 | 1020.05 | 1238.21 |
| 110 | - | - | - | - | - | - | 111.46 | 155.03 | 208.32 | 270.60 | 341.37 | 428.39 | 518.25 | 683.13 | 873.89 | 1078.24 | 1306.96 |
| 120 | - | - | - | - | - | - | 120.34 | 167.10 | 224.10 | 290.57 | 366.01 | 458.21 | 553.75 | 728.05 | 929.35 | 1173.91 | 1383.77 |
| 130 | - | - | - | - | - | - | 129.21 | 179.18 | 239.88 | 310.54 | 390.66 | 488.04 | 589.24 | 772.98 | 984.81 | 1241.01 | 1495.58 |
| 140 | - | - | - | - | - | - | - | 191.26 | 255.65 | 330.50 | 415.31 | 517.86 | 624.74 | 817.90 | 1040.27 | 1308.12 | 1575.44 |
| 150 | - | - | - | - | - | - | - | - | 271.43 | 350.47 | 439.96 | 547.69 | 660.23 | 862.82 | 1095.73 | 1375.23 | 1655.30 |
| 160 | - | - | - | - | - | - | - | - | 287.20 | 370.43 | 464.61 | 577.51 | 695.73 | 907.75 | 1151.19 | 1442.34 | 1735.16 |
| 170 | - | - | - | - | - | - | - | - | - | - | 489.25 | 607.34 | 731.22 | 952.67 | 1206.65 | 1509.44 | 1815.03 |
| 180 | - | - | - | - | - | - | - | - | - | - | 513.90 | 637.17 | 766.71 | 997.59 | 1262.11 | 1576.55 | 1894.89 |
| 190 | - | - | - | - | - | - | - | - | - | - | 538.55 | 666.99 | 802.21 | 1042.52 | 1317.57 | 1643.66 | 1977.75 |
| 200 | - | - | - | - | - | - | - | - | - | - | 563.20 | 696.82 | 837.70 | 1087.44 | 1373.03 | 1710.77 | 2054.61 |
Appendix. Informational data
- Developed and submitted by the Ministry of Machine Tool and Tool Industry of the USSR.
Developers: V.G. Seregin, A.M. Sviridov, N.I. Antonova, T.N. Kuptsova.
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Approved and put into effect by Decree of the USSR State Committee for Standards dated 07.02.84 No. 432.
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This standard fully complies with ST SEV 2662-80.
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International standard ISO 4762-77 is incorporated into this standard.
-
Supersedes GOST 11738-72.
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Referenced regulatory and technical documents
| Designation of the referenced regulatory document | Clause number |
|---|---|
| GOST 1759.0-87 | 12 |
| GOST 1759.1-82 | 4 |
| GOST 1759.2-82 | 6 |
| GOST 12414-94 | 3a |
| GOST 19256-73 | 7 |
| GOST 24705-2004 | 3 |
| GOST 27148-86 | 3 |
| ST SEV 2662-80 | Introductory part |
| ISO 4762-77 | Introductory part |
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The validity period restriction was lifted per Protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94).
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Edition with Amendment No. 1, approved in March 1989 (IUS 5-89).
Corresponds to DIN 7985, ISO 7045.
Estimate for the “GOST 17473-80” category
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