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Flange

Flange Standard ASTM A182, ASTM A105, ASTM A234 WPB, A860,A694,AWWA C207
Flange Material Carbon Steel Flange, Alloy Steel Flange, Stainless Steel Flange
Flange Sizes 1/2”-60” NPS (DN15-DN3000), SCH10,STD,SCH40,SCH60,XS,SCH80,SCH120,SCH160,XXS
Flange Class Class150-Class2500
Flange Facing RF/ FM/ M/ T G/ RF / FF / RTJ
Flange Types Socket Weld Flange, Slip On Flange, Blind,Screwed Flange, Ring Joint Flange, Weld Neck Flange, Long Weld Neck Flange


Common flanges

Special flanges

Blind Flanges
Blind Flanges are round plates which have all relevant boltholes but lack a center hole and thus are used to close off the ends of a piping system or a pressure vessel opening.

Forged Steel Blind Flanges conform to ASTM A105 while Stainless Steel Flanges conform to ASTM A182.
Stocked in sizes from 1/2" to 24".
Available both with a flat face and a raised face.
Flanges of Class 150#, 300#, 600#, 900#, and 1500# are stocked.
Available in Carbon Steel as well as Stainless in grades 304L and 316L (L=low carbon).
Carbon Steel Flanges are available in both domestic and less expensive Imported versions. All Stainless Blind Flanges that we stock are imported.

Lap Joint Flanges
Lap Joint Flanges slide directly over a pipe and are used with Stub Ends. Typically, a pipe is welded to the Stub End leaving the Lap Joint Flange to rotate freely around the stub end, simplifying bolt hole alignment.


Lap Joint Flanges are forged steel and conform to ASTM A105.
Stocked in sizes from 1.50" to 20".
Forged Steel Lap Joint Flanges are available in both domestic and less expensive Imported versions.
Stub Ends are sold separately.


Slip On Flanges
Slip On Flanges are manufactured with an inside diameter that is slightly larger than the pipe's outside diameter and are connected to the pipe via fillet weld at the top and bottom of the flange.

Stocked in sizes from 1/2" to 24", depending on the material.
Aluminum Flanges conform to ASM 6061 T6.
Carbon Steel Slip On Flanges conform to ASTM A105.
Stainless Steel Slip On Flanges conform to ASTM A182. Both 304L and 316L available.
Available with both a Raised Face and a Flat Face.

Socket Weld Flanges
Socket Weld Flanges are often used on smaller sizes of high pressure pipe and are attached to that pipe by inserting the pipe into the socket end and applying fillet weld around the top. This results in a smooth bore with excellent flow characteristics.

Stocked in sizes from 1/2" to 6".
Carbon Steel Socket Weld Flanges conform to ASTM A105.
Stainless Flanges conform to ASTM A182. Both 304L and 316L available.
Classes available range from 150# to 1500#.



Threaded Flanges
Threaded Flanges have a bore with tapered threads and connect to pipes that have external threads. The primary benefit of Threaded Flanges is that no welding is required to attach them.

Stocked in sizes from 1/2" to 8".
Carbon Steel Threaded Flanges conform to ASTM A105.
Stainless Steel Threaded Flanges conform to ASTM A182. Both 304L and 316L available.
Classes available range from 150# to 1500#.


Weld Neck Flanges
Weld Neck Flanges are attached by welding a pipe to the neck of the flange, transferring stress from the flange itself to the connected pipe. They are often used in high pressure applications.

Stocked in sizes from 1/2" to 24".
Aluminum Weld Neck Flanges conform to ASM 6061 T6.
Carbon Steel Weld Neck Flanges conform to ASTM A105.
High Yield Weld Neck Flanges conform to ASTM A694 F52.
Stainless Steel Weld Neck Flanges conform to ASTM A182. Both 304L and 316L available.
Classes available range from 150# to 1500#.


CLASS 150 According to ASTM A/SA-105; ANSI B16.5

Nominal 

Pipe 

Size 

Outside

Diam. of 

Flange (O) 

Thick. 

of 

Flange (C) 

Diam. 

of

Raised Face (R) 

Diam. 

of Hub 

at Base (X) 

Length 

thru Hub 

(Y) 

Min. 

Thread 

Length 

(T) 

Min. 

Counter 

Bore (Q) 

No. of 

Holes 

Diam. of 

Holes 

Diam. of 

Bolts 

Diam.

of Bolt 

Circle 

Approx. 

Weight

 (in Pounds) 

½  3.5 0.44 1.38 1.19 0.62 0.62 —  4 0.62 0.5 2.38 1
¾  3.88 0.5 1.69 1.5 0.62 0.62 —  4 0.62 0.5 2.75 2
1 4.25 0.56 2 1.94 0.69 0.69 —  4 0.62 0.5 3.12 2
1 ¼  4.62 0.62 2.5 2.31 0.81 0.81 —  4 0.62 0.5 3.5 3
1 ½  5 0.69 2.88 2.56 0.88 0.88 —  4 0.62 0.5 3.88 3
2 6 0.75 3.62 3.06 1 1 —  4 0.75 0.62 4.75 5
2 ½  7 0.88 4.12 3.56 1.12 1.12 —  4 0.75 0.62 5.5 7
3 7.5 0.94 5 4.25 1.19 1.19 —  4 0.75 0.62 6 8
3 ½  8.5 0.94 5.5 4.81 1.25 1.25 —  8 0.75 0.62 7 11
4 9 0.94 6.19 5.31 1.31 1.31 —  8 0.75 0.62 7.5 13
5 10 0.94 7.31 6.44 1.44 1.44 —  8 0.88 0.75 8.5 15
6 11 1 8.5 7.56 1.56 1.56 —  8 0.88 0.75 9.5 19
8 13.5 1.12 10.62 9.69 1.75 1.75 —  8 0.88 0.75 11.75 30
10 16 1.19 12.75 12 1.94 1.94 —  12 1 0.88 14.25 43
12 19 1.25 15 14.38 2.19 2.19 —  12 1 0.88 17 64
14 21 1.38 16.25 15.75 2.25 2.25 —  12 1.12 1 18.75 90
16 23.5 1.44 18.5 18 2.5 2.5 —  16 1.12 1 21.25 98
18 25 1.56 21 19.88 2.69 2.69 —  16 1.25 1.13 22.75 130
20 27.5 1.69 23 22 2.88 2.88 —  20 1.25 1.12 25 165
24 32 1.88 27.25 26.12 3.25 3.25 —  20 1.38 1.25 29.5 220


CLASS 300 According to ASTM A/SA-105; ANSI B16.5

Nominal 

Pipe 

Size  

Outside

Diam. of 

Flange (O)  

Thick. 

of 

Flange (C)  

Diam. 

of

Raised Face 

(R)

Diam. 

of Hub 

at Base 

(X)

Length 

thru Hub 

(Y) 

Min. 

Thread 

Length 

(T) 

Min. 

Counter Bore 

(Q) 

No. of 

Holes 

Diam. of 

Holes 

Diam.

of Bolts 

Diam.

of Bolt 

Circle 

Approx.

Weight 

(in Pounds) 

1/2 3.75 0.56 1.38 1.5 0.88 0.62 0.93 4 0.62 0.5 2.62 2
3/4 4.62 0.62 1.69 1.88 1 0.62 1.14 4 0.75 0.62 3.25 3
1 4.88 0.69 2 2.12 1.06 0.69 1.41 4 0.75 0.62 3.5 3
1 1/4 5.25 0.75 2.5 2.5 1.06 0.81 1.75 4 0.75 0.62 3.88 4
1 1/2 6.12 0.81 2.88 2.75 1.19 0.88 1.99 4 0.88 0.75 4.5 6
2 6.5 0.88 3.62 3.31 1.31 1.12 2.5 8 0.75 0.62 5 7
2 1/2 7.5 1 4.12 3.94 1.5 1.25 3 8 0.88 0.75 5.88 10
3 8.25 1.12 5 4.62 1.69 1.25 3.63 8 0.88 0.75 6.62 13
3 1/2 9 1.19 5.5 5.25 1.75 1.44 4.13 8 0.88 0.75 7.25 17
4 10 1.25 6.19 5.75 1.88 1.44 4.63 8 0.88 0.75 7.88 22
5 11 1.38 7.31 7 2 1.69 5.69 8 0.88 0.75 9.25 28
6 12.5 1.44 8.5 8.12 2.06 1.81 6.75 12 0.88 0.75 10.62 39
8 15 1.62 10.62 10.25 2.44 2 8.75 12 1 0.88 13 58
10 17.5 1.88 12.75 12.62 2.62 2.19 10.88 16 1.12 1 15.25 81
12 20.5 2 15 14.75 2.88 2.38 12.94 16 1.25 1.12 17.75 115
14 23 2.12 16.25 16.75 3 2.5 14.19 20 1.25 1.12 20.25 165
16 25.5 2.25 18.5 19 3.25 2.69 16.19 20 1.38 1.25 22.5 190
18 28 2.38 21 21 3.5 2.75 18.19 24 1.38 1.25 24.75 250
20 30.5 2.5 23 23.12 3.75 2.88 20.19 24 1.38 1.25 27 315
24 36 2.75 27.25 27.62 4.19 3.25 24.19 24 1.62 1.5 32 475


CLASS 600 According to ASTM A/SA-105; ANSI B16.5

Nominal 

Pipe 

Size  

Outside

Diam. of 

Flange (O)

Thick. 

of 

Flange 

(C)

Diam. 

of

Raised Face 

(R)

Diam. 

of Hub 

at Base (X)

Length 

thru Hub 

(Y) 

Min. 

Thread 

Length 

(T) 

Min. 

Counter 

Bore 

(Q) 

No. of 

Holes 

Diam. of 

Holes 

Diam. of 

Bolts 

Diam. of 

Bolt Circle 

Approx. 

Weight 

(in Pounds) 

1/2 3.75 0.56 1.38 1.5 0.88 0.62 0.93 4 0.62 0.5 2.62 2
3/4 4.62 0.62 1.69 1.88 1 0.62 1.14 4 0.75 0.62 3.25 3
1 4.88 0.69 2 2.12 1.06 0.69 1.41 4 0.75 0.62 3.5 4
1 1/4 5.25 0.81 2.5 2.5 1.12 0.81 1.75 4 0.75 0.62 3.88 5
1 1/2 6.12 0.88 2.88 2.75 1.25 0.88 1.99 4 0.88 0.75 4.5 7
2 6.5 1 3.62 3.31 1.44 1.12 2.5 8 0.75 0.62 5 9
2 1/2 7.5 1.12 4.12 3.94 1.62 1.25 3 8 0.88 0.75 5.88 13
3 8.25 1.25 5 4.62 1.81 1.38 3.63 8 0.88 0.75 6.62 16
3 1/2 9 1.38 5.5 5.25 1.94 1.56 4.13 8 1 0.88 7.25 21
4 10.75 1.5 6.19 6 2.12 1.62 4.63 8 1 0.88 8.5 37
5 13 1.75 7.31 7.44 2.38 1.88 5.69 8 1.12 1 10.5 63
6 14 1.88 8.5 8.75 2.62 2 6.75 12 1.12 1 11.5 80
8 16.5 2.19 10.62 10.75 3 2.25 8.75 12 1.25 1.12 13.75 115
10 20 2.5 12.75 13.5 3.38 2.56 10.88 16 1.38 1.25 17 170
12 22 2.62 15 15.75 3.62 2.75 12.94 20 1.38 1.25 19.25 200
14 23.75 2.75 16.25 17 3.69 2.88 14.19 20 1.5 1.38 20.75 230
16 27 3 18.5 19.5 4.19 3.06 16.19 20 1.62 1.5 23.75 330
18 29.25 3.25 21 21.5 4.62 3.12 18.19 20 1.75 1.63 25.75 400
20 32 3.5 23 24 5 3.25 20.19 24 1.75 1.62 28.5 510
24 37 4 27.25 28.25 5.5 3.62 24.19 24 2 1.88 33 730


CLASS 900According to ASTM A/SA-105; ANSI B16.5

Nominal 

Pipe 

Size 

Outside

Diam. of 

Flange (O)

Thick. 

of 

Flange 

(C)

Diam. 

of

Raised Face 

(R)

Diam. 

of Hub 

at Base 

(X)

Length 

thru Hub (Y) 

Min.

Thread 

Length 

(T) 

Min.

Counter 

Bore 

(Q) 

No. of

Holes 

Diam. of

Holes 

Diam. of

Bolts 

Diam. of

Bolt Circle 

Approx.

 Weight 

(in Pounds) 

1/2 4.75 0.88 1.38 1.5 1.25 0.88 0.93 4 0.88 0.75 3.25 4
3/4 5.12 1 1.69 1.75 1.38 1 1.14 4 0.88 0.75 3.5 5
1 5.88 1.12 2 2.06 1.62 1.12 1.41 4 1 0.88 4 8
1 1/4 6.25 1.12 2.5 2.5 1.62 1.19 1.75 4 1 0.88 4.38 9
1 1/2 7 1.25 2.88 2.75 1.75 1.25 1.99 4 1.12 1 4.88 12
2 8.5 1.5 3.62 4.12 2.25 1.5 2.5 8 1 0.88 6.5 25
2 1/2 9.62 1.62 4.12 4.88 2.5 1.88 3 8 1.12 1 7.5 36
3 9.5 1.5 5 5 2.12 1.62 3.63 8 1 0.88 7.5 26
4 11.5 1.75 6.19 6.25 2.75 1.88 4.63 8 1.25 1.12 9.25 53
5 13.75 2 7.31 7.5 3.12 2.12 5.69 8 1.38 1.25 11 83
6 15 2.19 8.5 9.25 3.38 2.25 6.75 12 1.25 1.12 12.5 110
8 18.5 2.5 10.62 11.75 4.00 2.50 8.75 12 1.5 1.38 15.5 170
10 21.5 2.75 12.75 14.5 4.25 2.81 10.88 16 1.5 1.38 18.5 245
12 24 3.12 15 16.5 4.62 3 12.94 20 1.5 1.38 21 325
14 25.25 3.38 16.25 17.75 5.12 3.25 14.19 20 1.62 1.5 22 400
16 27.75 3.5 18.5 20 5.25 3.38 16.19 20 1.75 1.63 24.25 425
18 31 4 21 22.25 6 3.5 18.19 20 2 1.88 27 600
20 33.75 4.25 23 24.5 6.25 3.62 20.19 20 2.12 2 29.5 730
24 41 5.5 27.25 29.5 8 4 24.19 20 2.62 2.5 35.5 1400


CLASS 1500 According to ASTM A/SA-105; ANSI B16.5

Nominal 

Pipe 

Size

Outside

Diam. of 

Flange (O)

Thick. 

of 

Flange 

(C) 

Diam. 

of

Raised Face 

(R)

Diam. 

of Hub 

at Base 

(X)

Length 

thru Hub 

(Y) 

Min. 

Thread 

Length 

(T) 

Min. 

Counter 

Bore 

(Q) 

No. of 

Holes 

Diam. of 

Holes 

Diam. of 

Bolts 

Diam. of 

Bolt Circle 

Approx. 

Weight 

(in Pounds) 

1/2 4.75 0.88 1.38 1.5 1.25 0.88 0.93 4 0.88 0.75 3.25 4
3/4 5.12 1 1.69 1.75 1.38 1 1.14 4 0.88 0.75 3.5 5
1 5.88 1.12 2 2.06 1.62 1.12 1.41 4 1 0.88 4 8
1 1/4 6.25 1.12 2.5 2.5 1.62 1.19 1.75 4 1 0.88 4.38 9
1 1/2 7 1.25 2.88 2.75 1.75 1.25 1.99 4 1.12 1 4.88 12
2 8.5 1.5 3.62 4.12 2.25 1.5 2.5 8 1 0.88 6.5 25
2 1/2 9.62 1.62 4.12 4.88 2.5 1.88 3 8 1.12 1 7.5 36

Thailand
A182-F36
DN100 x CL2500
500 Nos
 UAE
SS 304
size500,PN16
152 Nos
 UAE
ASTM A105
18" Class 300#
1562 Nos

Nigeria
ASTM A182 GRADE F 51
FLBL,GR F51,RF,LT,CL600,NPS16
2500 Nos

Columbia
ASTM A105
10" NPS, ANSI CLASS 900, RTJ 53
2630 Nos

Mexico
ASTM A105
1/2"- 150 # -RF 
500 Nos
 Mexico
ASTM A182 F53
6" sch10s
1500 Nos
 Serbia
ASTM A182 Gr.F304/304L
2" RTJ Face 1500 Lbs
3000 Nos


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