Stud bolts RF / RTJ 20" Class 900 — ASME B16.5
Stud bolts RF / RTJ 20" Class 900 to ASME B16.5: no. of studs 20, stud length rf 350 mm, stud length rtj 360 mm.
Dimensions of Stud bolts RF / RTJ 20" Class 900
| Symbol | Dimension | Value |
|---|---|---|
| · | No. of studs | 20 |
| · | Stud dia. | 2 in |
| · | Stud length RF | 350 mm (13.780 in) |
| · | Stud length RTJ | 360 mm (14.173 in) |
SKU TSH-BOLTING-ASME-B16-5-CLASS-900-20 · Standard ASME B16.5
Purchase description
STUD BOLTS RF / RTJ, 20", CLASS 900, ASTM A193 B7 / A194 2H, ASME B16.5
Available materials: ASTM A193 B7 / A194 2H, ASTM A320 L7 / A194 7, ASTM A193 B8M / A194 8M, Hot-dip galvanised B7.
Notes
- NPS 1/2–2-1/2 rows correspond to Class 1500 flange dimensions (B16.5 Class 900 uses Class 1500 dimensions for these sizes).
- Inch lengths differ slightly (e.g. NPS 1: 5 in vs 125 mm).
Same size, other ratings
Other sizes — Stud bolts RF / RTJ, Class 900
Frequently asked questions
What are the main types of pipe flanges?
Weld neck (WN), slip-on (SO), blind (BL), socket weld (SW), threaded (THD), lap joint (LJ) and plate flanges. Special types include orifice, long weld neck, reducing flanges and spectacle blinds.
When should I use a weld neck flange instead of a slip-on?
Use weld neck flanges for high pressure, high or cycling temperature, and lines with vibration or fatigue loading. The tapered hub and full-penetration butt weld spread stress smoothly. Slip-on flanges are cheaper and easier to align, but their fatigue life is roughly one third of a WN.
What does Class 150, 300 or 600 mean on a flange?
The ASME class is a pressure-rating designation, not a pressure in psi. The allowable pressure depends on the material group and temperature. A Class 150 A105 flange is rated 19.6 bar at 38 °C but 13.8 bar at 200 °C.
Is a 150# flange rated for 150 psi?
No. A Class 150 carbon-steel flange is rated about 285 psi (19.6 bar) at ambient temperature, and about 170 psi (11.7 bar) at 260 °C. The "150" is a class number.