Welding Neck Flanges Supplier & Dealers

We are Leading Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5

OTHER DIA

Notes

• Dimensions are in millimeters unless otherwise indicated.
• The length of the Stud Bolt does not include the height of the chamfers (points).
• The length of the Stud Bolts includes one Spiral Wound Gasket with a 4.5mm thick sealing element, which is compressed to 3mm while tightening the Raised Face flange connection.
• ID = Depending on the wall thickness of the pipe, must be specified by the purchaser.
• Important! please read this short article

Dimensional Tolerances of Weld Neck Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013

≤ 24 → 1.6 mm (0.06 in)
> 24 → ±3.2 mm (±0.12 in)

Diameter Hub at Base

≤ 24 → 1.6 mm (0.06 in)
> 24 → ±3.2 mm (±0.12 in)

Inside Diameter

≤ 10 → ±0.8 mm (±0.03 in)
12 thru 18 → 1.6 mm (0.06 in)
≥ 20 → +3.2 mm / -1.6 mm (±0.12 in / -0.06 in)

Diameter Hub at Point of Welding

≤ 5 → +2.4 mm / -0.8 mm (±0.09 in / -0.03 in)
≥ 6 → +4.0 mm / -0.8 mm (+0.15 in / -0.03 in)

Drilling

Bolt Circle → 1.6 mm (0.06 in)
Bolt Hole Spacing → ±0.8 mm (±0.03 in)

Eccentricity Bolt Circle

≤ 2.1/2 → 0.8 mm max (0.03 in max)
≥ 3 → 1.6 mm max (0.06 in max)

Thickness

≤ 18 → +3.2 mm / -0 (±0.12 in / -0)
≥ 20 → +4.8 mm / -0 (+0.18 in / -0)

Length thru Hub

≤ 10 → 1.6 mm (0.06 in)
≥ 12 → ±3.2 mm (±0.12 in)

Diameter Contact Face

1.6 mm RF (0.06 in) → ±0.8 mm (±0.03 in)
6.35 mm RF (0.25 in) → ±0.4 mm (±0.01 in)

Tongue & Groove → ±0.4 mm (±0.01 in)
Male-Female → ±0.4 mm (±0.01 in)

Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia

Hex bolts are measured from under the head to the end of the bolt