Class 600 Bolt Patterns and Bolt Lengths

Pipe Size	BOLTING PATTERN AND BOLT LENGTHS
	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Diameter of Bolts	Stud Bolts
	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Diameter of Bolts	0.25 in Raised Face

1/2	2.62	0.62	4	0.50	3.25
3/4	3.25	0.75	4	0.62	3.50
1	3.50	0.75	4	0.62	3.75
1 1/4	3.88	0.75	4	0.62	4.00
1 1/2	4.50	0.88	4	0.75	4.25
2	5.00	0.75	8	0.62	4.25
2 1/2	5.88	0.88	8	0.75	4.75
3	6.62	0.88	8	0.75	5.00
3 1/2	7.25	1.00	8	0.88	5.50
4	8.50	1.00	8	0.88	5.75
5	10.50	1.12	8	1.00	6.50
6	11.50	1.12	12	1.00	6.75
8	13.75	1.25	12	1.12	7.75
10	17.00	1.38	16	1.25	8.50
12	19.25	1.38	20	1.25	8.75
14	20.75	1.50	20	1.38	9.25
16	23.75	1.62	20	1.50	10.00
18	25.75	1.75	20	1.62	10.75
20	28.50	1.75	24	1.62	11.50
24	33.00	2.00	24	1.88	13.00
30	40.25	2.12	28	2.00
36	47.00	2.62	28	2.50
42	50.50	2.62	28	2.50
48	57.50	2.88	32	2.75