GOST 1145-80 Countersunk Head Wood Screws
GOST 1145-80 · Self-tapping screws
This is an informational translation of a Russian national standard. The Russian original is authoritative.
GOST 1145-80 applies to countersunk head wood screws with a shank diameter from 1.6 to 10 mm.
The standard fully complies with ST SEV 2327. The requirements of this standard are mandatory.
(Revised edition, Amendments No. 1, 2).
| COUNTERSUNK HEAD WOOD SCREWS Construction and dimensions Countersunk head wood screws. Construction and dimensions | GOST 1145-80 (ST SEV 2327-80) |
|---|
The construction and dimensions of the screws shall conform to those shown in the drawing and in Tables 1 and 2.
*Dimensions for reference.
Table 1
mm
| Thread diameter d (tolerance h₁₄) | 1.6 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 8 | 10 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Minor thread diameter d₂, max | 1.1 | 1.4 | 1.7 | 2.1 | 2.4 | 2.8 | 3.5 | 4.2 | 5.6 | 7.0 | |
| Thread pitch P (tolerance ± 0.2P) | 0.8 | 1 | 1.25 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.5 | 4.5 | |
| Head diameter D | 3.0 | 3.8 | 4.7 | 5.6 | 6.5 | 7.4 | 9.2 | 11.0 | 14.5 | 18.0 | |
| Head height K | 0.96 | 1.2 | 1.5 | 1.65 | 1.93 | 2.2 | 2.5 | 3 | 4 | 5 | |
| Spherical radius | R₁≈ | 2.6 | 3.2 | 4.0 | 4.8 | 5.6 | 6.4 | 8.0 | 9.6 | 12.8 | 16.0 |
| R₂≈ | 1.3 | 1.6 | 2.0 | 2.4 | 2.8 | 3.2 | 4.0 | 4.8 | 6.4 | 8.0 | |
| Cross recess number | - | 0 | 1 | 2 | 3 | 4 | |||||
| Cross recess diameter m | - | 2 | 2.7 | 2.8 | 4.0 | 4.3 | 4.6 | 6.5 | 7.5 | 9.7 | |
| Cross recess depth h, max | - | 1.1 | 1.4 | 1.5 | 1.7 | 2.0 | 2.3 | 2.7 | 3.7 | 4.6 | |
| Depth of gauge engagement in the cross recess. | max | - | 1.2 | 1.55 | 1.7 | 2.0 | 2.3 | 2.6 | 3.3 | 4.3 | 5.4 |
| min | - | 0.9 | 1.25 | 1.4 | 1.5 | 1.8 | 2.1 | 2.8 | 3.8 | 4.9 |
Table 2
mm
| Screw length l | Screw diameter d | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1.6 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 8 | 10 | |
| 7 | - | - | - | - | - | - | - | |||
| 10 | - | - | - | - | - | |||||
| 13 | - | - | - | |||||||
| 16 | - | - | - | - | ||||||
| (18) | - | - | - | - | ||||||
| 20 | - | - | Standard lengths | - | - | |||||
| (22) | - | - | - | - | ||||||
| 25 | - | - | - | - | ||||||
| 30 | - | - | - | - | - | |||||
| 35 | - | - | - | - | - | - | ||||
| 40 | - | - | - | - | - | - | ||||
| 45 | - | - | - | - | - | - | - | |||
| 50 | - | - | - | - | - | - | ||||
| 60 | - | - | - | - | - | - | ||||
| 70 | - | - | - | - | - | - | - | |||
| 80 | - | - | - | - | - | - | - | |||
| 90 | - | - | - | - | - | - | - | |||
| 100 | - | - | - | - | - | - | - |
Note. Screw lengths given in parentheses are not recommended for use.
Example of a designation for a type 1 screw, diameter d=3 mm, length l=20 mm, made of low-carbon steel, plain (uncoated):
Screw 1 - 3×20 GOST 1145-80
Same, with a 6 µm zinc coating applied by cathodic reduction, chromated:
Screw 1 - 3×20.016 GOST 1145-80
Same, type 2, made of corrosion-resistant steel, plain (uncoated):
Screw 2 - 3×20.2 GOST 1145-80
(Revised edition, Amendment No. 2).
Slot recesses - per GOST 24669, cross recesses - per GOST 10753.
(Revised edition, Amendment No. 2).
The diameter of the plain part of the shank d₁ shall be not less than the diameter for thread rolling and shall not exceed the nominal value of the major thread diameter of the screw.
(Added, Amendment No. 2).
Technical requirements - per GOST 1147.
The theoretical mass of the screws is given in Appendix 1.
Where interchangeability is required for use in products designed before 1 January 1980, screws may be manufactured, by agreement with the customer, with tolerances per Appendix 2.
Appendix 1. Mass of steel screws
| Wood screw length l, mm | Theoretical mass of 1000 steel screws, kg ≈ at nominal thread diameter d, mm | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1.6 | 2 | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 8 | 10 | |
| 7 | 0.09 | 0.14 | 0.21 | - | - | - | - | - | - | - |
| 10 | 0.12 | 0.20 | 0.30 | 0.42 | 0.57 | - | - | - | - | - |
| 13 | 0.16 | 0.25 | 0.39 | 0.56 | 0.75 | 0.97 | 1.45 | - | - | - |
| 16 | - | 0.31 | 0.48 | 0.69 | 0.93 | 1.20 | 1.81 | - | - | - |
| 18 | - | - | 0.54 | 0.77 | 1.04 | 1.35 | 2.06 | 2.89 | - | - |
| 20 | - | - | 0.60 | 0.86 | 1.16 | 1.51 | 2.30 | 3.24 | - | - |
| 22 | - | - | 0.66 | 0.95 | 1.28 | 1.66 | 2.54 | 3.58 | - | - |
| 25 | - | - | 0.75 | 1.08 | 1.46 | 1.89 | 2.90 | 4.10 | - | - |
| 30 | - | - | - | 1.30 | 1.75 | 2.28 | 3.51 | 4.97 | - | - |
| 35 | - | - | - | - | 2.05 | 2.66 | 4.11 | 5.84 | - | - |
| 40 | - | - | - | - | 2.34 | 3.05 | 4.72 | 6.70 | - | - |
| 45 | - | - | - | - | - | 3.43 | 5.30 | 7.57 | - | - |
| 50 | - | - | - | - | - | 3.82 | 5.93 | 8.43 | 14.75 | - |
| 60 | - | - | - | - | - | 4.59 | 7.14 | 10.16 | 17.80 | - |
| 70 | - | - | - | - | - | - | 8.35 | 11.90 | 20.85 | - |
| 80 | - | - | - | - | - | - | - | 13.63 | 23.90 | 36.97 |
| 90 | - | - | - | - | - | - | - | 15.36 | 26.96 | 41.72 |
| 100 | - | - | - | - | - | - | - | 17.09 | 30.01 | 46.47 |
Note. To determine the mass of brass screws, multiply the masses given in the table by a factor of 1.08.
Appendix 2. Tolerances for round head screws per the ESDP SEV and OST systems
| Tolerance zones | |
|---|---|
| per ESDP SEV | per OST system |
| h14 | B₇ |
| js17 | CM₁₀ |
| Designation of the referenced regulatory document | Clause number |
|---|---|
| GOST 1147-80 | 4 |
| GOST 10753-86 | 3 |
| GOST 24669-81 | 3 |
| ST SEV 2329-80 | 1 |
Reviewed in 1990. By Gosstandart Decree No. 406 of 29.03.91, the validity period restriction was lifted.
Reissued in October 1997 with Amendments No. 1, 2, approved in December 1981 and March 1991 (IUS 3-82, 6-91).
Complies with DIN 97, DIN 7982.
Estimate for the “GOST 1145-80” category
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