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Number of Bolt Holes

Home ♦ By NPS ♦ By Pressure ♦ Stainless Steel Fittings

Bolt Holes in Flanges

Flange Nominal Pipe Sizes (NPS) by Number of Bolt Holes

No of Bolt Holes	Pressure	NPS Range
4	150 LB	0.5" - 3.0"
4	300 LB	0.5" - 1.5"
4	600 LB	0.5" - 1.5"
4	900 LB	0.5" - 1.5"
4	1500 LB	0.5" - 1.5"
4	2500 LB	0.5" - 1.5"

8	150 LB	3.5" - 8.0"
8	300 LB	2.0" - 5.0"
8	600 LB	2.0" - 5.0"
8	900 LB	2.0" - 5.0"
8	1500 LB	2.0" - 5.0"
8	2500 LB	2.0" - 6.0"

12	150 LB	10.0" - 14.0"
12	300 LB	6.0" - 8.0"
12	600 LB	6.0" - 8.0"
12	900 LB	6.0" - 8.0"
12	1500 LB	6.0" - 10.0"
12	2500 LB	8.0" - 12.0"

16	150 LB	16.0" - 18.0"
16	300 LB	10.0" - 12.0"
16	600 LB	10.0"
16	900 LB	10.0"
16	1500 LB	12.0" - 24.0"

20	150 LB	20.0" - 24.0"
20	300 LB	14.0" - 16.0"
20	600 LB	12.0" - 18.0"
20	900 LB	12.0" - 24.0"


24	300 LB	18.0" - 24.0"
24	600 LB	20.0" - 24.0"

Home ♦ By NPS ♦ By Pressure ♦ Stainless Steel Fittings

Number of Bolt Holes in Flanges by Pressure

No of Bolt Holes	Pressure	NPS Range
4	150 LB	0.5" - 3.0"
8	150 LB	3.5" - 8.0"
12	150 LB	10.0" - 14.0"
16	150 LB	16.0" - 18.0"
20	150 LB	20.0" - 24.0"

4	300 LB	0.5" - 1.5"
8	300 LB	2.0" - 5.0"
12	300 LB	6.0" - 8.0"
16	300 LB	10.0" - 12.0"
20	300 LB	14.0" - 16.0"
24	300 LB	18.0" - 24.0"

4	600 LB	0.5" - 1.5"
8	600 LB	2.0" - 5.0"
12	600 LB	6.0" - 8.0"
16	600 LB	10.0"
20	600 LB	12.0" - 18.0"
24	600 LB	20.0" - 24.0"

4	900 LB	0.5" - 1.5"
8	900 LB	2.0" - 5.0"
12	900 LB	6.0" - 8.0"
16	900 LB	10.0"
20	900 LB	12.0" - 24.0"

4	1500 LB	0.5" - 1.5"
8	1500 LB	2.0" - 5.0"
12	1500 LB	6.0" - 10.0"
16	1500 LB	12.0" - 24.0"

4	2500 LB	0.5" - 1.5"
8	2500 LB	2.0" - 6.0"
12	2500 LB	8.0" - 12.0"

By NPS ♦ By Pressure ♦ Stainless Steel Fittings