FLANGE STANDARD LIBRARYAX FORGE · SPEC SHEET
SPEC SHEETNo. 420
ASME B16.5 · ASME B16.5-2025

B16.5 Class 600 24″ Weld Neck

DN600Weld NeckDimensions mmWeight kg
ASME B16.5 · 24″ (DN600) · Class 600 · Weld Neck FlangeASME B16.5 · 24″ (DN600) · Class 600 · Weld Neck Flange O.D. D 939.8 Bolt circle K 838.2 24ר50.8 Raised face Ø 692.2 Thickness C 101.6 RF height f 6.4 Length H 203.2 Hub Ø A 717.6 Weld end Ø 609.6 Both views share one scale (1:15); schematic only Unit: mm

Schematic — drawn from the table, not to scale for inspection.

SymbolItemValue
DOutside diameter939.8mm
CFlange thickness / blind thickness101.6mm
D2Raised face diameter692.2mm
fRaised face height6.4mm
KBolt circle diameter838.2mm
nNumber of bolt holes24pcs
dBolt hole diameter50.8mm
AHub diameter717.6mm
HHub length / overall length203.2mm
BWelding-end diameter609.6mm
—Approximate weight376kg

Pressure–temperature ratings · Class 600 · Group 1.1

≤ 38 °C102.0 bar50 °C99.6 bar100 °C93.4 bar150 °C90.1 bar200 °C87.6 bar250 °C83.9 bar300 °C79.8 bar325 °C77.3 bar350 °C75.3 bar375 °C72.8 bar400 °C69.3 bar425 °C57.5 bar450 °C45.9 bar475 °C35.0 bar500 °C23.0 bar538 °C11.6 bar

Source: Table 2-1.1 (printed p. 25) — pressure–temperature ratings for Group 1.1 materials, SI units; Group 1.1.

Material and notes

Base material: ASTM A105 (North America, Middle East, South-East Asia)

Rating: ASME classes are not fixed pressures. For ASTM A105 (material group 1.1) the ASME B16.5-2025 ambient rating is 285 psi (19.6 bar) at Class 150, 740 psi (51.0 bar) at Class 300, 985 psi (68.0 bar) at Class 400, 1,480 psi (102.0 bar) at Class 600, 2,2…

Tolerances / marking: Tolerances, facing finish, material and marking requirements: ASME B16.5-2025 Sections 6 and 7.

Notes / special requirements

Work order Inspector Date Travels with the part; file after inspection