Specialty Metal Pipe Flanges

Add strength and durability to your piping system with a United Titanium pipe flange. Manufactured in titanium grades 2 or 7 and zirconium grade 702, our flanges include: threaded, slip-on, reducing, blind, weld neck, socket weld and lap joint. We carry an extensive selection of sizes and styles ranging from 1/2” to 8” in diameter. All of our zirconium and titanium flanges are manufactured to ANSI B16.5 specifications. Sizes and styles that we don’t have in-stock can be made in an expedient manner.

Contact us to request a quote.

Dimensions

Blind Flanges*

NOMINAL
PIPE SIZE

OUTSIDE
DIA.

THICKNESS

DIA. OF
RAISED FACE

NUMBER OF
HOLES

DIA. OF
BOLTS +

DIA. OF
BOLT CIRCLE
  O Q** R      
1/2 3-1/2  7/16 1-3/8 4 1/2 2-3/8
3/4 3-7/8 1/2  1-11/16 4 1/2 2-3/4
1 4-1/4 9/16  2 4 1/2 3-1/8
1-1/4 4-5/8 5/8  2-1/2 4 1/2 3-1/2
1-1/2 5 11/16  2-7/8 4 1/2 3-7/8
2 6 3/4  3-5/8 4 5/8 4-3/4
2-1/2 7 7/8  4-1/8 4 5/8 5-1/2
3 7-1/2 15/16  5 4 5/8 6
3-1/2 8-1/2 15/16  5-1/2 8 5/8 7
4 9 15/16  6-3/16 8 5/8 7-1/2
5 10 15/16  7-5/16 8 3/4 8-1/2
6 11 1  8-1/2 8 3/4 9-1/2
8 13-1/2 1-1/8  10-5/8 8 3/4 11-3/4
10 16 1-3/16  12-3/4 12 7/8 14-1/4
12 19 1-1/4  15 12 7/8 17
14 21 1-3/8  16-1/4 12 1 18-3/4
16 23-1/2 1-7/16  18-1/2 16 1 21-1/4
18 25 1-9/16  21 16 1-1/8 22-3/4
20 27-1/2 1-11/16  23 20 1-1/8 25
24 32 1-7/8 27-1/4 20 1-1/4 29-1/2

*When ordering specify nominal pipe size or "O" dimension in inches indicating which is being used, pressure rating of flange and part number.

** The 1/16" raised face is included in Thickness "Q."

+ Bolt holes are 1/8" larger than bolt diameters.

• These lengths include thickness of two nuts but not height of crown.

(Flanges are supplied to ASTM B381)

 

Slip-on Flanges

NOMINAL
PIPE SIZE

OUTSIDE
DIA.

THICKNESS

DIA. OF
RAISED FACE

DIA. OF HUB
AT BASE

LENGTH
OF HUB

DIA. OF BORE

NUMBER OF
HOLES

DIA. OF
BOLTS+

DIA. OF
BOLT CIRCLE
  O Q** R X Y** W      
1/2 3-1/2 7/16 1-3/8 1-3/16 5/8 .88 4 1/2 2-3/8
3/4 3-7/8 1/2 1-11/16 1-1/2 5/8 1.09 4 1/2 2-3/4
1 4-1/4 9/16 2 1-15/16 11/16 1.36 4 1/2 3-1/8
1-1/4 4-5/8 5/8 2-1/2 2-5/16 13/16 1.70 4 1/2 3-1/2
1-1/2 5 11/16 2-7/8 2-9/16 7/8 1.95 4 1/2 3-7/8
2 6 3/4 3-5/8 3-1/16 1 2.44 4 5/8 4-3/4
2-1/2 7 7/8 4-1/8 3-9/16 1-1/8 2.94 4 5/8 5-1/2
3 7-1/2 15/16 5 4-1/4 1-3/16 3.57 4 5/8 6
3-1/2 8-1/2 15/16 5-1/2 4-13/16 1-1/4 4.07 8 5/8 7
4 9 15/16 6-3/16 5-5/16 1-5/16 4.57 8 5/8 7-1/2
5 10 15/16 7-5/16 6-7/16 1-7/16 5.66 8 3/4 8-1/2
6 11 1 8-1/2 7-9/16 1-9/16 6.72 8 3/4 9-1/2
8 13-1/2 1-1/8 10-5/8 9-11/16 1-3/4 8.72 8 3/4 11-3/4
10 16 1-3/16 12-3/4 12 1-15/16 10.88 12 7/8 14-1/4
12 19 1-1/4 15 14-3/8 2-3/16 12.88 12 7/8 17
14 21 1-3/8 16-1/4 15-3/4 2-1/4 14.14 12 1 18-3/4
16 23-1/2 1-7/16 18-1/2 18 2-1/2 16.16 16 1 21-1/4
18 25 1-9/16 21 19-7/8 2-11/16 18.18 16 1-1/8 22-3/4
20 27-1/2 1-11/16 23 22 2-7/8 20.20 20 1-1/8 25
24 32 1-7/8 27-1/4 26-1/8 3-1/4 24.25 20 1-1/4 29-1/2

** The 1/16" raised face is included in Thickness "Q" and Length "Y."

+ Bolt holes are 1/8" larger than bolt diameters.

• These lengths include thickness of two nuts but not height of crown.

(Flanges are supplied to ASTM B381)

 

 

Weld Neck Dimensions

NOMINAL
PIPE SIZE

OUTSIDE
DIA.

THICKNESS

DIA. OF
RAISED FACE

DIA. OF
HUB AT
BASE

MIN. DIA. OF HUB AT POINT OF WELDING

LENGTH THRU HUB

DIA. OF BORE

NUMBER OF
HOLES

DIA. OF
BOLTS+

DIA. OF
BOLT CIRCLE
   O  Q**  R X H Y** J ♢      
1/2 3-1/2 7/16 1-3/8 1-3/16 0.84 1-7/8 0.62 4 1/2 2-3/8
3/4 3-7/8 1/2 1-11/16 1-1/2 1.05 2-1/16 0.82 4 1/2 2-3/4
1 4-1/4 9/16 2 1-15/16 1.32 2-3/16 1.05 4 1/2 3-1/8
1-1/4 4-5/8 5/8 2-1/2 2-5/16 1.66 2-1/4 1.38 4 1/2 3-1/2
1-1/2 5 11/16 2-7/8 2-9/16 1.90 2-7/16 1.61 4 1/2 3-7/8
2 6 3/4 3-5/8 3-1/16 2.38 2-1/2 2.07 4 5/8 4-3/4
2-1/2 7 7/8 4-1/8 3-9/16 2.88 2-3/4 2.47 4 5/8 5-1/2
3 7-1/2 15/16 5 4-1/4 3.50 2-3/4 3.07 4 5/8 6
3-1/2 8-1/2 15/16 5-1/2 4-13/16 4.00 2-13/16 3.55 8 5/8 7
4 9  15/16 6-3/16 5-5/16 4.50 3 4.03 8 5/8 7-1/2
5 10 15/16 7-5/16 6-7/16 5.56 3-1/2 5.05 8 3/4 8-1/2
6 11 1 8-1/2 7-9/16 6.63 3-1/2 6.07 8 3/4 9-1/2
8 13-1/2 1-1/8 10-5/8 9-11/16 8.63 4 7.98 8 3/4 11-3/4
10 16 1-3/16 12-3/4 12 10.75 4 10.02 12 7/8 14-1/4
12 19 1-1/4 15 14-3/8 12.75 4-1/2 12.00 12 7/8 17
14 21 1-3/8 16-1/4 15-3/4 14.00 5 13.25 12 1 18-3/4
16 23-1/2 1-7/16 18-1/2 18 16.00 5 15.25 16 1 21-1/4
18 25 1-9/16 21 19-7/8 18.00 5-1/2 17.25 16 1-1/8 22-3/4
20 27-1/2 1-11/16 23 22 20.00 5-11/16 19.25 20 1-1/8 25
24 32 1-7/8 27-1/4 26-1/8 24.00 6 23.25 20 1-1/4 29-1/2

** The 1/16" raised face is included in Thickness "Q" and Length "Y."

+ Bolt holes are 1/8" larger than bolt diameters.

• These lengths include thickness of two nuts but not height of crown.

♢ Unless otherwise ordered, flanges are bored to these dimensions which correspond to the I.D. of Standard Weight pipe as listed in American Standard B36.10.

(Flanges are supplied to ASTM B381)

 

Socket Weld Dimensions*

NOMINAL
PIPE SIZE

OUTSIDE
DIA.

THICKNESS
MIN.

DIA. OF
RAISED FACE

DIA. OF HUB
AT BASE

LENGTH
THROUGH
HUB

DIA. OF
BORE

DIA. OF
SOCKET

 DEPTH OF
SOCKET
  O Q** R X Y** B A Z
1/4 3-1/2 7/16 1-3/8 1-3/16 5/8 0.364 0.580 3/8
3/8 3-1/2 7/16 1-3/8 1-3/16 5/8 0.493 0.715 3/8
1/2 3-1/2 7/16 1-3/8 1-3/16 5/8 0.622 0.88 3/8
3/4 3-7/8 1/2 1-11/16 1-1/2 5/8 0.824 1.09 7/16
1 4-1/4 9/16 2 1-15/16 1-1/16 1.049 1.36 1/2
1-1/4 4-5/8 5/8 2-1/2 2-5/16 1-3/16 1.380 1.70 9/16
1-1/2 5 11/16 2-7/8 2-9/16 7/8 1.610 1.95 5/8
2 6 3/4 3-5/8 3-1/16 1 2.067 2.44 11/16
2-1/2 7 7/8 4-1/8 3-9/16 1-1/8 2.469 2.94 3/4
3 7-1/2 15/16 5 4-1/4 1-3/16 3.068 3.57 13/16
3-1/2 8-1/2 15/16 5-1/2 4-13/16 1-1/4 3.548 4.07 7/8
4 9 15/16 6-3/16 5-5/16 1-5/16 4.026 4.56 15/16
5 10 15/16 7-5/16 6-7/16 1-7/16 5.047 5.66 15/16
6 11 1 8-1/2 7-9/16 1-9/16 6.065 6.72 1-1/16
8 13-1/2 1-1/8 10-5/8 9-11/16 1-3/4 7.981 8.72 1-1/4
10 16 1-3/16 12-3/4 12 1-15/16 10.020 10.88 1-5/16
12 19 1-1/4 15 14-3/8 2-3/16 12.000 12.88 1-9/16
14 21 1-3/8 16-1/4 15-3/4 2-1/4 13.250 14.19 1-5/8
16 23-1/2 1-7/16 18-1/2 18 2-1/2 15.250 16.19 1-3/4
18 25 1-9/16 21 19-7/8 2-11/16 17.250 18.19 1-15/16
20 27-1/2 1-11/16 23 22 2-7/8 19.250 20.19 2-1/8
24 32 1-7/8 27-1/4 26-1/8 3-1/4 23.250 24.19 2-1/2

*Sizes 1/2" through 3" are included in ASA B16/5-1953. Dimensions for all other sizes except for the bore dimension are the same as ASA Slip-on flanges.

** The 1/16" raised face is included in Thickness "Q" and Length "Y." Flanges are drilled the same as ASA 150-lb. flanges.

(Flanges are supplied to ASTM B381)

Applications

Titanium and Zirconium Pipe Flange Applications

Known for their high-strength and light-weight, titanium pipe flanges offer corrosion protection in seawater, making them ideal for marine applications, as well as oil and gas offshore drilling systems. They’re also often used in chemical processing systems requiring chlorine and chlorine compounds. While titanium flanges are known for their lightweight strength, zirconium flanges boast extreme corrosion resistance in particularly harsh chemical environments, such as hydrochloric acid, sulfuric acid, formic acid, nitric acid and acetic acid. Common pipe flange applications include:

Materials

Titanium Zirconium
 CP-TI (Grade 2) 702 
TI-PD (Grade 7)  

Specifications

ASME FlangesASTM Flanges

View our pipe flange inventory below and quickly request a quote by entering your desired quantity and clicking the Add to RFQ button. Use the search filter to narrow down your choices by typing in the flange size or material. Add additional items by navigating through the fittings, fasteners and mill products inventory. Once you are ready to submit your request, simply open the RFQ cart at the bottom of the page and click submit. 

Inventory List

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S-01A4700S04
1/2" 150# RF BLIND FLANGE TI GR2
In Stock : 15
S-01A4700S06
3/4" 150# RF BLIND FLANGE TI GR 2
In Stock : 10
S-01A4700S08
1" 150# RF BLIND FLANGE TI GR 2
In Stock : 6
S-01A4700S16
2" 150# RF BLIND FLANGE TI GR 2
In Stock : 6
S-01A4700S24
3" 150# RF BLIND FLANGE TI GR 2
In Stock : 34
S-01A4700S32
4" 150# RF BLIND FLANGE TI GR 2
In Stock : 10
S-01A4700S48
6" 150# RF BLIND FLANGE TI GR 2
In Stock : 6
S-01A4700S64
8" 150# RF BLIND FLANGE TI GR2
In Stock : 10
S-01A4910S08
1" S/10 150# RFWN FLANGE TI GR2
In Stock : 1
S-01A4910S12
1-1/2" S/10 150# RFWN FLANGE TI GR2
In Stock : 7
S-01A4910S16
2" S/10S 150# RFWN FLANGE TI GR2
In Stock : 12
S-01A4910S24
3" S/10 150# RFWN FLANGE TI GR2
In Stock : 15
S-01A4910S32
4" S/10 150# RFWN FLANGE TI GR2
In Stock : 8
S-01A4910S48
6" S/10 150# RFWN FLANGE TI GR2
In Stock : 9
S-01A4940S04
1/2" S/40 150# RFWN FLANGE TI GR2
Available
S-01A4940S06
3/4" S/40 150# RFWN FLANGE GR2
In Stock : 5
S-01A4940S08
1" S/40 150# RFWN FLANGE TI GR2
In Stock : 31
S-01A4940S12
1-1/2"S/40 150# RFWN FLANGE TI GR2
In Stock : 16
S-01A4940S16
2" S/40 150# RFWN FLANGE TI GR2
In Stock : 13
S-01A4940S24
3" S/40 150# RFWN FLANGE TI GR2
In Stock : 33
S-01A4940S32
4" S/40 150# RFWN FLANGE TIGR2
In Stock : 16
S-01A4940S48
6" S/40 150# RFWN FLANGE TIGR2
In Stock : 5
S-01A4A00S04
1/2" 150# RFSO FLANGE TI GR2
In Stock : 26
S-01A4A00S06
3/4" 150# RFSO FLANGE TI GR2
In Stock : 15
S-01A4A00S08
1" 150# RFSO FLANGE TI GR 2
In Stock : 19
S-01A4A00S12
1-1/2" 150# RFSO FLANGE TI GR 2
In Stock : 17
S-01A4A00S16
2" 150# RFSO FLANGE TI GR 2
In Stock : 24
S-01A4A00S24
3" 150# RFSO FLANGE TI GR 2
In Stock : 26
S-01A4A00S32
4" 150# RFSO FLANGE TI GR 2
In Stock : 28
S-01A4A00S48
6" 150# RFSO FLANGE TI GR 2
In Stock : 10
S-01A4A00S64
8" 150# RFSO FLANGE TI GR2
In Stock : 14
S-01A5400S08
1" 150# LAP JOINT FLANGE TI GR 2
In Stock : 15
S-01A5400S12
1-1/2" 150# LAP JOINT FLANGE TI GR2
In Stock : 8
S-01A5400S16
2" 150# LAP JOINT FLANGE TI GR2
In Stock : 9
S-01A5400S24
3" 150# LAP JOINT FLANGE TI GR2
In Stock : 8
S-01A5400S32
4" 150# LAP JOINT FLANGE TI GR2
In Stock : 11
S-01A5400S48
6" 150# LAP JOINT FLANGE TI GR2
In Stock : 4
S-01A5400S64
8" 150# LAP JOINT FLANGE TI GR2
In Stock : 7
S-03A4700S06
3/4" 150# RF BLIND FLANGE TI GR 7
In Stock : 1
S-03A4700S08
1" 150# RF BLIND FLANGE TI GR 7
In Stock : 1
S-03A4700S12
1-1/2" 150# RF BLIND FLANGE TI GR 7
In Stock : 1
S-03A4700S16
2" 150# RF BLIND FLANGE TI GR 7
In Stock : 1
S-03A4700S24
3" 150# RF BLIND FLANGE TI GR 7
In Stock : 1
S-04A4700S04
1/2" 150# RF BLIND FLANGE ZIRC 702
In Stock : 10
S-04A4700S06
3/4" 150# RF BLIND FLANGE ZIRC 702
In Stock : 5
S-04A4700S08
1" 150# RF BLIND FLANGE ZIRC 702
In Stock : 7
S-04A4700S12
1-1/2" 150# RF BLIND FLANGE ZIRC 702
In Stock : 12
S-04A4700S16
2" 150# RF BLIND FLANGE ZIRC 702
In Stock : 12
S-04A4700S24
3" 150# RF BLIND FLANGE ZIRC 702
In Stock : 4
S-04A4700S32
4" 150# RF BLIND FLANGE ZIRC 702
In Stock : 5
S-04A4700S48
6" 150# RF BLIND FLANGE ZIRC 702
In Stock : 2
S-04A4A00S06
3/4" 150# RFSO FLANGE ZIRC 702
In Stock : 4
S-04A4A00S08
1" 150# RFSO FLANGE ZIRC 702
In Stock : 13
S-04A4A00S12
1-1/2" 150# RFSO FLANGE ZIRC 702
In Stock : 3
S-04A4A00S16
2" 150# RFSO FLANGE ZIRC 702
In Stock : 5
S-04A4A00S24
3" 150# RFSO FLANGE ZIRC 702
In Stock : 8
S-04A4A00S32
4" 150# RFSO FLANGE ZIRC 702
In Stock : 2
S-04A4A00S48
6" 150# RFSO FLANGE ZIRC 702
In Stock : 3
S-04F4700S04
1/2" 300# RF BLIND FLANGE ZIRC 702
In Stock : 4
S-04F4700S08
1" 300# RF BLIND FLANGE ZIRC 702
In Stock : 2
S-04F4700S16
2" 300# RF BLIND FLANGE ZIRC 702
In Stock : 3
S-04F4A00S16
2" 300# RFSO FLANGE ZIRC 702
Available