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
PressureNPS Range
4150 LB0.5" - 3.0"
4300 LB0.5" - 1.5"
4600 LB0.5" - 1.5"
4900 LB0.5" - 1.5"
41500 LB0.5" - 1.5"
42500 LB0.5" - 1.5"

8150 LB3.5" - 8.0"
8300 LB2.0" - 5.0"
8600 LB2.0" - 5.0"
8900 LB2.0" - 5.0"
81500 LB2.0" - 5.0"
82500 LB2.0" - 6.0"

12150 LB10.0" - 14.0"
12300 LB6.0" - 8.0"
12600 LB6.0" - 8.0"
12900 LB6.0" - 8.0"
121500 LB6.0" - 10.0"
122500 LB8.0" - 12.0"

16150 LB16.0" - 18.0"
16300 LB10.0" - 12.0"
16600 LB10.0"
16900 LB10.0"
161500 LB12.0" - 24.0"

20150 LB20.0" - 24.0"
20300 LB14.0" - 16.0"
20600 LB12.0" - 18.0"
20900 LB12.0" - 24.0"

24300 LB18.0" - 24.0"
24600 LB20.0" - 24.0"

Home   ♦   By NPS   ♦   By Pressure   ♦   Stainless Steel Fittings

Number of Bolt Holes in Flanges by Pressure

No of
Bolt Holes
PressureNPS Range
4150 LB0.5" - 3.0"
8150 LB3.5" - 8.0"
12150 LB10.0" - 14.0"
16150 LB16.0" - 18.0"
20150 LB20.0" - 24.0"

4300 LB0.5" - 1.5"
8300 LB2.0" - 5.0"
12300 LB6.0" - 8.0"
16300 LB10.0" - 12.0"
20300 LB14.0" - 16.0"
24300 LB18.0" - 24.0"

4600 LB0.5" - 1.5"
8600 LB2.0" - 5.0"
12600 LB6.0" - 8.0"
16600 LB10.0"
20600 LB12.0" - 18.0"
24600 LB20.0" - 24.0"

4900 LB0.5" - 1.5"
8900 LB2.0" - 5.0"
12900 LB6.0" - 8.0"
16900 LB10.0"
20900 LB12.0" - 24.0"

41500 LB0.5" - 1.5"
81500 LB2.0" - 5.0"
121500 LB6.0" - 10.0"
161500 LB12.0" - 24.0"

42500 LB0.5" - 1.5"
82500 LB2.0" - 6.0"
122500 LB8.0" - 12.0"

By NPS   ♦   By Pressure   ♦   Stainless Steel Fittings