GMG Catalog

Styles RW, RWI Dimensions1/4" to 24" FlangesClass 400 Class 600InnerSealing ElementOuterSizeRingRingNPS Inside (A) Inside (B) Outside (C) Outside (D)Diameter Diameter Diameter Diameter1/4* — 0.50 0.88 1.751/2* — 0.75 1.25 2.133/4* — 1.00 1.56 2.631* — 1.25 1.88 2.881-1/4* — 1.88 2.38 3.251-1/2* — 2.13 2.75 3.752* — 2.75 3.38 4.382-1/2* — 3.25 3.88 5.133* — 4.00 4.75 5.883-1/2* — 4.13 5.25 6.384 4.04 4.75 5.88 7.004-1/2* — 5.31 6.50 7.635 5.05 5.81 7.00 8.386 6.10 6.88 8.25 9.758 8.10 8.88 10.38 12.0010 10.05 10.81 12.50 14.1312 12.10 12.88 14.75 16.5014 13.50 14.25 16.00 19.0016 15.35 16.25 18.25 21.1318 17.25 18.50 20.75 23.3820 19.25 20.50 22.75 25.5024 23.25 24.75 27.00 30.25InnerSealing ElementOuterSizeRingRingNPS Inside (A) Inside (B) Outside (C) Outside (D)Diameter Diameter Diameter Diameter1/4* — 0.50 0.88 1.751/2 0.56 0.75 1.25 2.133/4 0.81 1.00 1.56 2.631 1.06 1.25 1.88 2.881-1/4 1.50 1.88 2.38 3.251-1/2 1.75 2.13 2.75 3.752 2.19 2.75 3.38 4.382-1/2 2.62 3.25 3.88 5.133 3.19 4.00 4.75 5.883-1/2* — 4.13 5.25 6.384 4.04 4.75 5.88 7.634-1/2* — 5.31 6.50 8.255 5.05 5.81 7.00 9.506 6.10 6.88 8.25 10.508 8.10 8.88 10.38 12.6310 10.05 10.81 12.50 15.7512 12.10 12.88 14.75 18.0014 13.50 14.25 16.00 19.3816 15.35 16.25 18.25 22.2518 17.25 18.50 20.75 24.1320 19.25 20.50 22.75 26.8824 23.25 24.75 27.00 31.1318Class 900* ASME B16.20 does not include dimensions for NPS 1/4, 3-1/2 or 4-1/2,InnerSealing ElementOuterSizeRingRingNPS Inside (A) Inside (B) Outside (C) Outside (D)Diameter Diameter Diameter Diameter1/2* — 0.75 1.25 2.503/4* — 1.00 1.56 2.751* — 1.25 1.88 3.131-1/4* — 1.56 2.38 3.501-1/2* — 1.88 2.75 3.882* — 2.31 3.38 5.632-1/2* — 2.75 3.88 6.503 3.10 3.75 4.75 6.633-1/2* — 4.13 5.25 7.504 4.04 4.75 5.88 8.134-1/2* — 5.31 6.50 9.385 5.05 5.81 7.00 9.756 6.10 6.88 8.25 11.388 7.75 8.75 10.13 14.1310 9.69 10.88 12.25 17.1312 11.50 12.75 14.50 19.6314 12.63 14.00 15.75 20.5016 14.75 16.25 18.00 22.6318 16.75 18.25 20.50 25.1320 19.00 20.50 22.50 27.5024 23.25 (5) 24.75 26.75 33.00or Class 400 flanges up to NPS 3 and Class 900 flanges up to NPS 2-1/2.Dimensions in inches.Notes:1. The inner ring thickness shall be 0.117-0.131 inches.2. For sizes NPS 1-1/4 thru NPS 3, the inside diameter tolerance is ±0.03inches; for larger sizes, the inside diameter tolerance is ±0.06 inches.3. There are no Class 400 flanges NPS 1/2 thru NPS 3 (use Class 600),Class 900 flanges NPS 1/2 thru NPS 2-1/2 (use Class 1500), or Class2500 flanges NPS 14 or larger.4. The inner ring inside diameters shown for NPS 1-1/4 thru 2-1/2 inClass 1500 and 2500 will produce inner ring widths of 0.12 inches,a practical minimum for production purposes.5. Inner rings are required for Class 900, NPS 24 gaskets, Class 1500NPS 12 thru NPS 24 gaskets, and Class 2500 NPS 4 thru NPS 12gaskets.