Class 300 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	Machine Bolts	Stud Bolts
	Diameter of Bolt Circle	Diameter of Bolt Holes	Number of Bolts	Diameter of Bolts	0.006 in Raised Face	0.006 in Raised Face

1/2	2.62	0.62	4	0.50	2.25	2.75
3/4	3.25	0.75	4	0.62	2.50	3.00
1	3.50	0.75	4	0.62	2.75	3.25
1 1/4	3.88	0.75	4	0.62	2.75	3.25
1 1/2	4.50	0.88	4	0.75	3.00	3.75
2	5.00	0.75	8	0.62	3.00	3.50
2 1/2	5.88	0.88	8	0.75	3.50	4.00
3	6.62	0.88	8	0.75	3.75	4.25
3 1/2	7.25	0.88	8	0.75	3.75	4.50
4	7.88	0.88	8	0.75	4.00	4.50
5	9.25	0.88	8	0.75	4.25	4.75
6	10.62	0.88	12	0.75	4.25	5.00
8	13.00	1.00	12	0.88	4.75	5.50
10	15.25	1.12	16	1.00	5.50	6.25
12	17.75	1.25	16	1.12	6.00	6.75
14	20.25	1.25	20	1.12	6.25	7.00
16	22.50	1.38	20	1.25	6.50	7.50
18	24.75	1.38	24	1.25	6.75	7.75
20	27.00	1.38	24	1.25	7.25	8.25
24	32.00	1.62	24	1.50	8.00	9.25
30	39.25	1.88	28	1.75
36	46.00	2.12	32	2.00
42	47.50	1.75	32	1.62
48	54.00	2.00	32	1.88