GOST 17673-81 Bolts with Increased Countersunk Head and Square Shoulder, Product Grade C. Construction and Dimensions

GOST 17673-81 establishes the construction and dimensions of bolts with increased countersunk head and square shoulder, product grade C, with nominal thread diameter from 5 to 16 mm.

BOLTS WITH INCREASED COUNTERSUNK HEAD AND SQUARE SHOULDER, PRODUCT GRADE C Construction and dimensions Increased countersunk square shoulder bolts product grade C. Construction and dimensions	GOST 17673-81* (ST SEV 2324-80) Supersedes GOST 17673-72

The construction and dimensions of bolts shall conform to those shown in the drawing and in Tables 1 and 2.

Nominal thread diameter d		5	6	8	10	12	16
Head diameter D		11	14	18	23	28	35
Head height with shoulder k (Js16)		6	7	9	11	13	16
Size of square shoulder side V		5	6	8	10	12	16
Thread length b	For l ≤ 120	16	18	22	26	30	38
	For l > 120	-	-	-	-	-	44

Example of designation for a bolt with thread diameter d = 12 mm, coarse thread pitch with tolerance class 8g, length l = 60 mm, property class 4.6, with zinc coating 6 µm thick, applied by cathodic reduction, chromated:

Bolt M12 × 60 .46.016 GOST 17673-81

Thread — per GOST 24705-81, thread pitch — coarse. Thread runout and incomplete thread — per GOST 27148-86. Bolt ends — per GOST 12414-66.

Tolerances and methods of inspection of 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 part of the shank d₁ is approximately equal to the pitch diameter of the thread or equal to the nominal thread diameter.

Bolt length l	Nominal thread diameter d
	5	6	8	10	12	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	-	-	-	-	-
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 up to the shoulder.

Technical requirements — per GOST 1759.0-87. The mechanical properties of bolts shall conform to property classes 3.6, 4.6 and 5.6.

The theoretical mass of bolts is given in the reference appendix.

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	3.562	-	-	-	-	-
25	4.180	6.467	12.23	-	-	-
30	4.799	7.350	13.82	23.85	37.56	-
35	5.418	8.232	15.41	26.36	41.20	-
40	6.036	9.115	17.01	28.87	44.84	-
45	6.655	9.997	18.60	31.38	48.48	91.30
50	7.274	10.879	20.19	33.90	52.12	97.90
55	-	11.761	21.78	36.41	55.75	104.50
60	-	12.643	23.38	38.92	59.39	111.10
65	-	-	24.98	41.43	63.03	117.80
70	-	-	26.58	43.94	66.66	124.40
75	-	-	28.18	46.45	70.30	131.10
80	-	-	29.78	48.96	73.94	137.80
90	-	-	-	55.98	81.22	151.10
100	-	-	-	63.00	88.49	164.40
110	-	-	-	-	95.77	177.80
120	-	-	-	-	103.04	191.10
130	-	-	-	-	-	204.40
140	-	-	-	-	-	217.70
150	-	-	-	-	-	231.00
160	-	-	-	-	-	244.40
170	-	-	-	-	-	257.70
180	-	-	-	-	-	271.00
190	-	-	-	-	-	284.40
200	-	-	-	-	-	297.70

Corresponds to DIN 605.