Long Welding Neck

  • In accordance to ASME/ANSI B16.5, MSS SP-6 & 25
  • ASTM / ASME A/SA-182
  • Necks are furnished machined all over
  • Unless otherwise specified Class 300 Seamless Long Necks will be furnished drilled with a 0.06” raised face which is included in thickness “C’’ and length “Y”.’

Additional Information

Use Custom Product to make a request for dimensions not shown.  

Pressure-Temperature Ratings (Class 300)

Metal Temperature F° Pressurea (Type 304/L & 316/L)
-20 to 100 600
200 505
300 455
400 415
500 380
600 360
650 350
700 345
750 335
800 330
850 320b
900 –
950 –
1000 –

a  (Pounds per Square Inch Gage)

b Class 316/L

Dimensional Tolerances

OUTSIDE DIAMETER* When O.D. is 24” or less ±1/16”
When O.D. is over 24” ±1/8”
INSIDE DIAMETER* 10” and smaller ±1/32”
12” through 18” ±1/16”
20” and larger +1/8” -1/16”
DIAMETER OF CONTACT FACE 1/16” Raised Face ±1/32”
1/4” raised Face Tongue and Groove, or Male and Female ±1/64”
DIAMETER OF HUB AT POINT OF WELDING 5” and smaller +3/32”, -1/32”
6” and larger +5/32”, – 1/32”
WELDING BEVEL STANDARDS See drawings
DIAMETER OF HUB AT BASE* When Hub Base is 24” or less ±1/16”
When Hub Base is over 24” ±1/8”
DRILLING Bolt Circle ±1/16”
Bolt hole spacing ±1/32”
ECCENTRICITY BOLT CIRCLE & FACING (with respect to Bore*) 2 1/2” and smaller 1/32” max
3” and larger 1/16” max
LENGTH THRU HUB* 10” and smaller ±1/16”
12” and larger ±1/8”
THICKNESS 18” and smaller +1/8” -0”
20” and larger +3/16” -0”
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