Carbon Steel Flanges
Our Carbon Steel Flanges are manufactured using high-quality materials complying with ASTM A 105 and ASTM A 181 standards. These flanges are designed to meet industrial requirements in oil & gas, petrochemical, and high-pressure applications. Below are the standard dimensional tolerances for Welding Neck, Threaded, Slip-on, Socket Weld, and Blind flanges.
Material Specifications
| Welding Neck | Threaded, Slip-on Lap Joint, Socket Welding, Blind | ||
|---|---|---|---|
| Outside Diameter O.D. 600 or smaller O.D. over 600 |
+1.6 mm +3.1 mm |
Outside Diameter O.D. 50 or smaller O.D. over 600 |
+1.6 mm +3.1 mm |
| Inside Diameter (Bore) 250 and smaller 12 through 450 500 and larger |
+0.7 mm +1.6 mm +3.1 mm |
Inside Diameter (Bore) 250 and smaller 300 and larger |
+0.7 / -0.0 mm +1.6 / -0.0 mm |
| Diameter of Contact Face 1.6 raised face 6.3 raised face tongue & groove |
+0.4 mm +0.4 mm |
Diameter of Contact Face Threaded (250 and smaller) Threaded (300 and larger) |
+0.7 mm +1.6 mm |
| Diameter of Hub at Base 600 or smaller Over 600 |
+1.6 mm +3.1 mm |
Outside Diameter of Hub 300 and smaller 350 and larger |
+2.3 / -1.6 mm +4.0 / -1.6 mm |
| Diameter of Hub at Point of Welding 125 and smaller 150 and larger |
+2.2 / -0.7 mm +4.0 / -0.7 mm |
Diameter of Contact Face (Raised/Tongue & Groove) | +0.7 mm / +0.4 mm |
| Thickness 450 and smaller 500 and larger |
+3.1 mm +4.7 mm |
Thickness 450 and smaller 500 and larger |
+3.1 / -0.0 mm +4.7 / -0.0 mm |
| Length Through Hub 250 and smaller 300 and larger |
+1.6 mm +3.1 mm |
Length Through Hub 450 and smaller 500 and larger |
+3.0 / -1.6 mm +4.8 / -1.6 mm |
| Bolt Circle | +0.7 mm (≤600) +1.6 mm (>600) |
Bolt Circle | +1.6 mm |
| Drilling (Bolt Hole Spacing) | +0.7 mm | Drilling (Bolt Hole Spacing) | +0.7 mm |
| Eccentricity with Respect to Bore | 0.70 mm max | ||