Click Specification

(Non-preferred) dimensions in parentheses.

Square Nuts with B.S.Threads - Black [Table 3]

BS 916 - 1953

Display drawing:

Thread Size
d

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

7/8

1-1/8

1-1/4

(1-3/8)

1-1/2

(1-5/8)

PP	No. of Threads/Inch	BSW
		BSF
s	max
	min
e	max
k	max
	min

20	18	16	14	12	12	11	10	9	8	7	7	6	6	5
26	22	20	18	16	16	14	12	11	10	9	9	8	8	8
0.445	0.525	0.6	0.71	0.82	0.92	1.01	1.2	1.3	1.48	1.67	1.86	2.05	2.22	2.41
0.435	0.515	0.585	0.695	0.8	0.9	0.985	1.175	1.27	1.45	1.64	1.815	2.005	2.175	2.365
0.63	0.74	0.85	1.00	1.16	1.30	1.43	1.70	1.84	2.09	2.36	2.63	2.90	3.14	3.41
0.220	0.270	0.332	0.395	0.467	0.530	0.602	0.728	0.810	0.935	1.060	1.205	1.330	1.455	1.580
0.200	0.250	0.312	0.375	0.437	0.500	0.562	0.687	0.750	0.875	1.000	1.125	1.250	1.375	1.500

Thread Size
d

1-3/4

2-1/4

2-1/2

2-3/4

(3-1/4)

3-1/2

(3-3/4)

4-1/2

5-1/2

PP	No. of Threads/Inch	BSW
		BSF
s	max
	min
e	max
k	max
	min

5	4.5	4	4	3.5	3.5	3.25	3.25	3	3	2.875	2.75	2.625	2.5
7	7	6	6	6	5	5	4.5	4.5	4.5	4	4	4	4
2.58	2.76	3.15	3.55	3.89	4.18	4.53	4.85	5.18	5.55	6.38	7.3	8.35	9.45
2.52	2.7	3.09	3.49	3.83	4.08	4.43	4.75	5.08	5.45	6.255	7.175	8.225	9.325
3.65	3.90	4.45	5.02	5.50	5.91	6.41	6.86	7.33	7.85	9.02	10.32	11.81	13.36
1.725	1.850	1.975	2.225	2.475	2.775	3.025	3.275	3.525	3.775	4.200	4.700	5.200	5.700
1.625	1.750	1.875	2.125	2.375	2.625	2.875	3.125	3.375	3.625	4.000	4.500	5.000	5.500

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26	[UNI] UNI 6419 - 1969	Square Nuts For Manufacture of Railway and Tramway Rolling Stock - ISO Metric Coarse Thread - Finish C
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