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Class 350 Flanges

Slip On

Weld Neck Flanges

Blind

(Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions)

INDUSTRY STANDARD CLASS 350

Thickness Bore LTH
Nom Size OD Weld Neck Slip-On Blind OD of RF Dia at Base Weld Neck Slip-On Weld Neck Slip-On Dia Bevel
O T T R X B B L L A
26 32.75 2.5 2.5 2.75 29.5 27.88 flanges, flange, industrial flanges, industrial flange, industrial pipe flanges, industrial fittings, industrial pipe, industrial carbon steel, industrial blind, industrial blinds, industrial, industrial waterworks, industrial stainless steel, industrial steel, industrial weld, industrial forgings, industrial orifice, industrial slip, industrial steel flange, industrial steel flanges, industrial titanium flange, industrial titanium flanges 26.25 5 4.5 flanges, flange, industrial flanges, industrial flange, industrial pipe flanges, industrial fittings, industrial pipe, industrial carbon steel, industrial blind, industrial blinds, industrial, industrial waterworks, industrial stainless steel, industrial steel, industrial weld, industrial forgings, industrial orifice, industrial slip, industrial steel flange, industrial steel flanges, industrial titanium flange, industrial titanium flanges
28 34.75 2.5 2.5 2.88 31 .50 29.88 28.25 5 4.5
30 37 2.63 2.63 3 33.75 32.13 30.25 5.25 4.75
32 39 2.75 2.75 3.25 35.75 34.13 32.25 5.5 5
34 41 2.88 2.88 3.38 37.75 36.13 34.25 5.75 5.13
36 43.75 3.13 3.13 3.63 40.25 38.5 36.25 6.13 5.63
38 45.75 3.13 3.13 3.75 42.25 40.5 38.25 6.13 5.63
40 47.75 3.25 3.25 4 44.25 42.5 40.25 6.25 5.88
42 50 3.5 3.5 4.13 46.5 44.75 42.25 6.5 6.13
44 52.75 3.75 3.75 4.38 48.88 46.75 44.25 6.75 6.75
46 54.75 4.25 4.25 4.75 50.88 48.75 46.25 7.25 7.25
48 56.75 4.25 4.25 4.75 52.88 50.75 48.25 7.25 7.25
52 61.5 4.25 57.25 55 52.25 7.5
54 63.5 4.5 4.75 59.25 57 54.25 7.75 8.25
60 69.5 4.5 5 65.25 63 60.25 8 8.5
66 77 4 72.38 70 66.25 8.5
72 83 4 78.38 76 72.25 9

Dimensions are in inches. Weights are in pounds.

Drilling Weight
Nom Size Bolt Circle Bolt Length Hole Dia # of Holes Weld Neck Slip On Blind
26 30.63 8 1.13 28 245 225 580
28 32.63 8.25 1.13 28 260 250 750
30 34.88 8.5 1.13 32 305 295 890
32 36.88 8.75 1.13 36 340 325 1050
34 38.88 9 1.13 40 375 355 1225
36 41.5 9.75 1.25 40 480 465 1500
38 43.5 10 1.25 40 510 490 1700
40 45.5 10.25 1.25 44 540 530 1975
42 47.75 10.75 1.25 48 640 620 2225
44 50.25 11.5 1.38 44 760 760 2625
46 52.25 12.25 1.38 48 880 880 2950
48 54.25 12.25 1.38 48 920 920 3300
52 58.75 1.5 52 1075
54 60.75 1.5 52 1200 1150
60 66.75 1.5 60 1325 1450
66 74 1.63 60 1675
72 80 1.63 72 1850

Dimensions are in inches. Weights are in pounds.

Note:
Sizes are nominal inside diameters of pipe or shell used with Welding Neck flanges, and nominal OD of pipe or shell used with Slip-On flanges. Larger sizes as well as intermediate sizes can be furnished.

* Bolt Length figured on Slip-On/Blind bolting combination. Other combinations may affect bolt lengths.

Bolt lengths are calculated based on bolting on slip-on to one blind. Any other bolting combination will cause variance in bolt length.

Bolt hole diameter 1/8in. larger than bolt diameter

Class 350 Flange PDF (for printing).