GOST 1147-80 WOOD SCREWS GENERAL SPECIFICATIONS

WOOD SCREWS

GENERAL SPECIFICATIONS

GOST 1147-80

(ST SEV 2331-89)

IPK STANDARDS PUBLISHING HOUSE

Moscow

State Standard of the Union of Soviet Socialist Republics

WOOD SCREWS General specifications Wood screws. General specifications	GOST 1147-80 (ST SEV 2331-89)

Effective date 1982-01-01

This standard applies to wood screws of product grade B with countersunk, raised countersunk, round, and hexagon heads.

This standard fully complies with ST SEV 2331-89.

(Amended edition, Amendment No. 3).

1. TECHNICAL REQUIREMENTS.

1.1. Wood screws shall be manufactured in accordance with the requirements of this standard and the requirements of dimensional standards.

1.2. Wood screws shall be manufactured:

from carbon steel grades 08kp, 10kp per GOST 10702, GOST 1050, and GOST 5663;

from corrosion-resistant steels per GOST 5632;

from brass per GOST 12920 and GOST 15527.

By agreement between the manufacturer and the consumer, wood screws may be manufactured from other materials with mechanical properties no lower than those of the above materials.

1.2.1. This standard establishes the following material designations:

carbon steels … 0

corrosion-resistant steels … 2

brasses … 3

1.3. Wood screws shall be manufactured with or without coating. Types of coatings and their designations - per GOST 1759.0.

(Revised edition, Amendment No. 2).

1.3.1. Selection of coating thickness - per GOST 9.303.

(Amended edition, Amendment No. 3).

1.3.2. Technical requirements for coating appearance - per GOST 9.301.

1.4. The tolerance field for the shank diameter of the wood screw is h14, for the shank length - js17.

Parallelism tolerance of the slot walls relative to the shank axis is 0.0875 of the slot depth.

Tolerances of dimensions, form deviations, and surface location not established by this standard - per GOST 1759.1 for products of product grade B.

(Revised edition, Amendment No. 2).

1.4.1. (Deleted, Amendment No. 2).

1.5. Surface defects of wood screws - per GOST 1759.2. The following are also not permitted on the surface of wood screws:

scratches that cause the dimensions of the wood screws to exceed the limit deviations;

the presence of partially cut, thickened, and torn thread sections with a total length exceeding 10% of the thread length along the helix;

rust that cannot be removed with kerosene.

(Revised edition, Amendment No. 2).

1.6. The following are not permitted on wood screws:

rounding of the hexagon edges toward the bearing surface by more than 0.25 of the head height (Fig. 10);

Fig. 10*

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• Figs. 1-9 deleted.

rounding of the hexagon edges that causes the circumscribed circle diameter to exceed the limit deviations;

rounding of the head bearing collar of wood screws that causes the head diameters to exceed the limit deviation;

underfill in the form of a flattened apex of round and raised countersunk heads, if the diameter of the flattened area exceeds 40% of the nominal head diameter. Underfill must not cause the head height to exceed the limit deviation;

when manufacturing a slotted head by cold heading, a reduction of the minimum head diameter in the direction of the slot exceeding:

for wood screws with thread diameter up to 2 mm inclusive - 0.3 mm;

for wood screws with thread diameter from 2.5 to 5 mm inclusive - 0.6 mm;

for wood screws with thread diameter over 5 mm - 0.7 mm;

when cutting the slot - an increase of the nominal head diameter along the slot axis exceeding 0.1 mm;

thickening of the shank diameter under the head of wood screws by more than:

0.05 mm over a length of up to 5 mm - for wood screws with diameter up to 16 mm;

0.1 mm over a length of up to 8 mm - for wood screws with diameter 20 mm;

a smooth conical section between the end of the thread runout and the unthreaded part of the shank (Fig. 11), reduced for thread rolling, with a length exceeding two thread pitches;

thread undercut exceeding two thread pitches (for wood screws with thread up to the head);

(Amended edition, Amendments No. 2, 3).

Fig. 11

1.7. For wood screws with a cylindrical threaded part, the last 2-3 thread turns shall have an incomplete thread profile depth.

For wood screws having fewer than four thread turns, the incomplete-profile turns shall not exceed 30% of the length of the threaded part.

(Amended edition, Amendment No. 3).

1.6a. The threaded part of wood screws is manufactured as cylindrical or conical and shall have a pointed tip (gimlet point) at the end. For wood screws with a conical threaded part, the largest outer thread diameter shall be equal to the nominal diameter of the wood screw.

The gimlet point of the wood screw shall have at least 1.5 thread turns. Rounding of the gimlet point tip for wood screws with diameter up to 5 mm inclusive shall not exceed 20% of the shank diameter; for wood screws with diameter over 5 mm - 40% of the shank diameter.

1.7a. The thread shall be sharp. The following rounding of the thread crests of wood screws is permitted (Fig. 12a).

and ≤ 0.15(d-d2), where d, d2 are nominal values of thread dimensions.

Fig. 12a*

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• Fig. 12 deleted.

1.6a, 1.7a. (Additionally introduced, Amendment No. 3).

1.8. The designation of wood screws shall be formed in accordance with the diagram given in the mandatory appendix.

2. ACCEPTANCE RULES.

2.1. Acceptance rules for wood screws - per GOST 17769 for products of accuracy grade B (normal).

3. TEST METHODS.

3.1. Inspection of surface defects of wood screws - per GOST 1759.2.

(Revised edition, Amendment No. 2).

3.2. (Deleted, Amendment No. 2).

3.3. Inspection of dimensions, form, and location deviations of surfaces - per GOST 1759.1.

The shape of the slot base is not checked.

(Amended edition, Amendments No. 2, 3).

3.4. The appearance and coating thickness shall be checked per GOST 9.302. The choice of method for checking coating thickness is at the discretion of the manufacturer. Coating thickness shall be checked on the head of the wood screw.

3.5-3.10. (Deleted, Amendment No. 2).

3.11. The minor diameter of the cut thread shall be checked at the roots of the full-profile turns.

3.12. For wood screws manufactured by cold heading, the parallelism and perpendicularity tolerances of surfaces, radius dimensions, runout in a given direction, the height of the spherical and conical portions of raised countersunk heads, thread dimensions, and surface roughness need not be checked and shall be ensured by the tooling and manufacturing process.

(Amended edition, Amendment No. 3).

4. PACKAGING AND MARKING.

4.1. Temporary corrosion protection, packaging of wood screws, and marking of containers - per GOST 18160.

(Revised edition, Amendment No. 2).

Appendix

Mandatory

DIAGRAM OF WOOD SCREW DESIGNATION

Wood screw	I-	d ×	l	M	P	T	GOST
Product name	Type	Product diameter	Product length	Material designation	Coating designation	Coating thickness	Standard designation

Notes:

1. Carbon steels and the absence of coating are not indicated in the designation.

2. When wood screws are made from a material not specified in this standard, the material grade must be indicated in the designation.

3. Type 1 need not be indicated.

(Revised edition, Amendment No. 2).

INFORMATIONAL DATA

1. DEVELOPED AND SUBMITTED BY the Ministry of Ferrous Metallurgy of the USSR

DEVELOPERS

I. N. Nedoviziy, K. G. Zalyalyutdinov, V. G. Vilde, I. V. Barysheva, R. V. Zhirova

2. APPROVED AND PUT INTO EFFECT by Decree of the USSR State Committee for Standards dated 30.06.80 No. 3274

3. The standard fully complies with ST SEV 2331-89

4. SUPERSEDES GOST 1147-70

5. REFERENCE REGULATORY AND TECHNICAL DOCUMENTS

Designation of the referenced regulatory document	Clause number
GOST 9.301-86	1.3.2
GOST 9.302-88	3.4
GOST 9.303-84	1.3.1
GOST 1050-88	1.2
GOST 1759.0-87	1.3
GOST 1759.1-82	1.4, 3.3
GOST 1759.2-82	1.5, 3.1
GOST 5632-72	1.2
GOST 5663-79	1.2
GOST 10702-78	1.2
GOST 12920-67	1.2
GOST 15527-70	1.2
GOST 17769-83	2.1
GOST 18160-72	4.1

6. The validity period restriction was lifted by Protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)

7. REISSUE (October 1997) with Amendments No. 2, 3, approved in July 1988 and May 1990 (IUS 2-88, 8-90)

Corresponds to DIN 571.