RTJ type R gasket dimensions and tolerances

Class 150-2500 – NPS 1/2-36

Dimensions & Tolerances Type R Ring Gaskets ASME B16.20 to be used with RTJ flanges ASME B16.5 & B16.47 series A

P = average pitch diameter of ring ±0.18
A = width of ring ±0.20
B & H = height of ring +1.3. -0.5
Variation in height throughout the entire circumference of any given ring shall not exceed 0.5 within these tolerances
C = width of flat on octagonal ring ±0.20
R1 = radius in ring ±0.5
23 deg = angle ±0 deg 30 min
R-30 = for lapped joint only