231/235 Chouhan House, 2nd Kumbharwada Lane, Sant Sena Maharaj Marg, Mumbai, Maharashtra 400004, India
+91 95946 66986 · sanjay@steelimp.com · steelimp.com
GSTIN 27ADJPJ5621J1ZF · Reference copy · 11 November 2026
STEEL IMPEX INDIA · ENGINEERING REFERENCE
RTJ Ring Gasket Dimensions | R Number Chart
Find R-number ring-joint gasket dimensions with original source notes. Check pitch diameter and ring geometry before specifying the required flange joint. Select the exact size/class and facing used by the order; keep the stated source units and revision with the values.
Open reference Common questionsASME B16.20-2017, Table 5.1 · mm · All listed sizes
Published dimensional reference snapshot, retrieved 2026-11-11. Confirm the specified standard edition, tolerances and manufacturer drawing before manufacture or purchase. A missing value remains Not listed.
Metric and inch dimensions preserve their separately published values where available; minor rounding differences are expected.
All 94 rings compared with Lamons. R24 inch pitch corrected to 3.75 (Lamons and Al-Iman metric 95.25); R98 missing metric pitch restored to 1022.35 (Lamons and Revoseal). R55 flat width stays 0.780 in / 19.81 mm (Al-Iman and Neoseal agree); Lamons alternate 0.750 in / 19.05 mm retained in audit. R92 oval metric stays 17.5 mm; Lamons lists 0.690 in but leaves metric blank.
| Ring | Pitch diameter | Ring width | Oval ring height | Octagonal ring height |
|---|---|---|---|---|
| R-11 | 34.14 mm | 6.35 mm | 11.2 mm | 9.7 mm |
| R-12 | 39.7 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-13 | 42.88 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-14 | 44.45 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-15 | 47.63 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-16 | 50.8 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-17 | 57.15 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-18 | 60.33 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-19 | 65.1 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-20 | 68.28 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-21 | 72.24 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-22 | 82.55 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-23 | 82.55 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-24 | 95.25 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-25 | 101.6 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-26 | 101.6 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-27 | 107.95 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-28 | 111.13 mm | 12.7 mm | 19.1 mm | 17.5 mm |
| R-29 | 114.3 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-30 | 117.48 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-31 | 123.83 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-32 | 127 mm | 12.7 mm | 19.1 mm | 17.5 mm |
| R-33 | 131.78 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-34 | 131.78 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-35 | 136.53 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-36 | 149.23 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-37 | 149.23 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-38 | 157.18 mm | 15.88 mm | 22.4 mm | 20.6 mm |
| R-39 | 161.93 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-40 | 171.45 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-41 | 180.98 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-42 | 190.5 mm | 19.05 mm | 25.4 mm | 23.9 mm |
| R-43 | 193.68 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-44 | 193.68 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-45 | 211.15 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-46 | 211.15 mm | 12.7 mm | 19.1 mm | 17.5 mm |
| R-47 | 228.6 mm | 19.05 mm | 25.4 mm | 23.9 mm |
| R-48 | 247.65 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-49 | 269.88 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-50 | 269.88 mm | 15.88 mm | 22.4 mm | 20.6 mm |
| R-51 | 279.4 mm | 22.23 mm | 28.7 mm | 26.9 mm |
| R-52 | 304.8 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-53 | 323.85 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-54 | 323.85 mm | 15.88 mm | 22.4 mm | 20.6 mm |
| R-55 | 342.9 mm | 28.58 mm | 36.6 mm | 35.1 mm |
| R-56 | 381 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-57 | 381 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-58 | 381 mm | 22.23 mm | 28.7 mm | 26.9 mm |
| R-59 | 396.88 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-60 | 406.4 mm | 31.75 mm | 39.6 mm | 38.1 mm |
| R-61 | 419.1 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-62 | 419.1 mm | 15.88 mm | 22.4 mm | 20.6 mm |
| R-63 | 419.1 mm | 25.4 mm | 33.3 mm | 31.8 mm |
| R-64 | 454.03 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-65 | 469.9 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-66 | 469.9 mm | 15.88 mm | 22.4 mm | 20.6 mm |
| R-67 | 469.9 mm | 28.58 mm | 36.6 mm | 35.1 mm |
| R-68 | 517.53 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-69 | 533.4 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-70 | 533.4 mm | 19.05 mm | 25.4 mm | 23.9 mm |
| R-71 | 533.4 mm | 28.58 mm | 36.6 mm | 35.1 mm |
| R-72 | 558.8 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-73 | 584.2 mm | 12.7 mm | 19.1 mm | 17.5 mm |
| R-74 | 584.2 mm | 19.05 mm | 25.4 mm | 23.9 mm |
| R-75 | 584.2 mm | 31.75 mm | 39.6 mm | 38.1 mm |
| R-76 | 673.1 mm | 7.95 mm | 14.2 mm | 12.7 mm |
| R-77 | 692.15 mm | 15.88 mm | 22.4 mm | 20.6 mm |
| R-78 | 692.15 mm | 25.4 mm | 33.3 mm | 31.8 mm |
| R-79 | 692.15 mm | 34.93 mm | 44.5 mm | 41.4 mm |
| R-80 | 615.95 mm | 7.95 mm | Not listed | 12.7 mm |
| R-81 | 635 mm | 14.3 mm | Not listed | 19.1 mm |
| R-82 | 57.15 mm | 11.13 mm | Not listed | 16 mm |
| R-84 | 63.5 mm | 11.13 mm | Not listed | 16 mm |
| R-85 | 79.38 mm | 12.7 mm | Not listed | 17.5 mm |
| R-86 | 90.5 mm | 15.88 mm | Not listed | 20.6 mm |
| R-87 | 100.03 mm | 15.88 mm | Not listed | 20.6 mm |
| R-88 | 123.83 mm | 19.05 mm | Not listed | 23.9 mm |
| R-89 | 114.3 mm | 19.05 mm | Not listed | 23.9 mm |
| R-90 | 155.58 mm | 22.23 mm | Not listed | 26.9 mm |
| R-91 | 260.35 mm | 31.75 mm | Not listed | 38.1 mm |
| R-92 | 228.6 mm | 11.13 mm | 17.5 mm | 16 mm |
| R-93 | 749.3 mm | 19.05 mm | Not listed | 23.9 mm |
| R-94 | 800.1 mm | 19.05 mm | Not listed | 23.9 mm |
| R-95 | 857.25 mm | 19.05 mm | Not listed | 23.9 mm |
| R-96 | 914.4 mm | 22.23 mm | Not listed | 26.9 mm |
| R-97 | 965.2 mm | 22.23 mm | Not listed | 26.9 mm |
| R-98 | 1022.35 mm | 22.23 mm | Not listed | 26.9 mm |
| R-99 | 234.95 mm | 11.13 mm | Not listed | 16 mm |
| R-100 | 749.3 mm | 28.58 mm | Not listed | 35.1 mm |
| R-101 | 800.1 mm | 31.75 mm | Not listed | 38.1 mm |
| R-102 | 857.25 mm | 31.75 mm | Not listed | 38.1 mm |
| R-103 | 914.4 mm | 31.75 mm | Not listed | 38.1 mm |
| R-104 | 965.2 mm | 34.93 mm | Not listed | 41.4 mm |
| R-105 | 1022.35 mm | 34.93 mm | Not listed | 41.4 mm |
| Ring | Flat width | Corner radius |
|---|---|---|
| R-11 | 4.32 mm | 1.5 mm |
| R-12 | 5.23 mm | 1.5 mm |
| R-13 | 5.23 mm | 1.5 mm |
| R-14 | 5.23 mm | 1.5 mm |
| R-15 | 5.23 mm | 1.5 mm |
| R-16 | 5.23 mm | 1.5 mm |
| R-17 | 5.23 mm | 1.5 mm |
| R-18 | 5.23 mm | 1.5 mm |
| R-19 | 5.23 mm | 1.5 mm |
| R-20 | 5.23 mm | 1.5 mm |
| R-21 | 7.75 mm | 1.5 mm |
| R-22 | 5.23 mm | 1.5 mm |
| R-23 | 7.75 mm | 1.5 mm |
| R-24 | 7.75 mm | 1.5 mm |
| R-25 | 5.23 mm | 1.5 mm |
| R-26 | 7.75 mm | 1.5 mm |
| R-27 | 7.75 mm | 1.5 mm |
| R-28 | 8.66 mm | 1.5 mm |
| R-29 | 5.23 mm | 1.5 mm |
| R-30 | 7.75 mm | 1.5 mm |
| R-31 | 7.75 mm | 1.5 mm |
| R-32 | 8.66 mm | 1.5 mm |
| R-33 | 5.23 mm | 1.5 mm |
| R-34 | 7.75 mm | 1.5 mm |
| R-35 | 7.75 mm | 1.5 mm |
| R-36 | 5.23 mm | 1.5 mm |
| R-37 | 7.75 mm | 1.5 mm |
| R-38 | 10.49 mm | 1.5 mm |
| R-39 | 7.75 mm | 1.5 mm |
| R-40 | 5.23 mm | 1.5 mm |
| R-41 | 7.75 mm | 1.5 mm |
| R-42 | 12.32 mm | 1.5 mm |
| R-43 | 5.23 mm | 1.5 mm |
| R-44 | 7.75 mm | 1.5 mm |
| R-45 | 7.75 mm | 1.5 mm |
| R-46 | 8.66 mm | 1.5 mm |
| R-47 | 12.32 mm | 1.5 mm |
| R-48 | 5.23 mm | 1.5 mm |
| R-49 | 7.75 mm | 1.5 mm |
| R-50 | 10.49 mm | 1.5 mm |
| R-51 | 14.81 mm | 1.5 mm |
| R-52 | 5.23 mm | 1.5 mm |
| R-53 | 7.75 mm | 1.5 mm |
| R-54 | 10.49 mm | 1.5 mm |
| R-55 | 19.81 mm | 2.3 mm |
| R-56 | 5.23 mm | 1.5 mm |
| R-57 | 7.75 mm | 1.5 mm |
| R-58 | 14.81 mm | 1.5 mm |
| R-59 | 5.23 mm | 1.5 mm |
| R-60 | 22.33 mm | 2.3 mm |
| R-61 | 7.75 mm | 1.5 mm |
| R-62 | 10.49 mm | 1.5 mm |
| R-63 | 17.3 mm | 2.3 mm |
| R-64 | 5.23 mm | 1.5 mm |
| R-65 | 7.75 mm | 1.5 mm |
| R-66 | 10.49 mm | 1.5 mm |
| R-67 | 19.81 mm | 2.3 mm |
| R-68 | 5.23 mm | 1.5 mm |
| R-69 | 7.75 mm | 1.5 mm |
| R-70 | 12.32 mm | 1.5 mm |
| R-71 | 19.81 mm | 2.3 mm |
| R-72 | 5.23 mm | 1.5 mm |
| R-73 | 8.66 mm | 1.5 mm |
| R-74 | 12.32 mm | 1.5 mm |
| R-75 | 22.33 mm | 2.3 mm |
| R-76 | 5.23 mm | 1.5 mm |
| R-77 | 10.49 mm | 1.5 mm |
| R-78 | 17.3 mm | 2.3 mm |
| R-79 | 24.82 mm | 2.3 mm |
| R-80 | 5.23 mm | 1.5 mm |
| R-81 | 9.58 mm | 1.5 mm |
| R-82 | 7.75 mm | 1.5 mm |
| R-84 | 7.75 mm | 1.5 mm |
| R-85 | 8.66 mm | 1.5 mm |
| R-86 | 10.49 mm | 1.5 mm |
| R-87 | 10.49 mm | 1.5 mm |
| R-88 | 12.32 mm | 1.5 mm |
| R-89 | 12.32 mm | 1.5 mm |
| R-90 | 14.81 mm | 1.5 mm |
| R-91 | 22.33 mm | 2.3 mm |
| R-92 | 7.75 mm | 1.5 mm |
| R-93 | 12.32 mm | 1.5 mm |
| R-94 | 12.32 mm | 1.5 mm |
| R-95 | 12.32 mm | 1.5 mm |
| R-96 | 14.81 mm | 1.5 mm |
| R-97 | 14.81 mm | 1.5 mm |
| R-98 | 14.81 mm | 1.5 mm |
| R-99 | 7.75 mm | 1.5 mm |
| R-100 | 19.81 mm | 2.3 mm |
| R-101 | 22.33 mm | 2.3 mm |
| R-102 | 22.33 mm | 2.3 mm |
| R-103 | 22.33 mm | 2.3 mm |
| R-104 | 24.82 mm | 2.3 mm |
| R-105 | 24.82 mm | 2.3 mm |
Reference sources
- https://www.lamons.com/wp-content/uploads/2021/09/Lamons-Gasket-Fastener-Handbook.pdf
- https://www.imangaskets.com/wp-content/uploads/2020/02/al-iman-gasket-product-catalogue_compressed.pdf
- https://test.revoseal.com/wp-content/uploads/2018/07/revoseal_Gasket_Product_Catalog.pdf
- https://neosealengg.com/technical-info.html
Prepare a bulk enquiry for delivery within India
Include the material grade, standard and edition, complete size, quantity, finish, certificates, required date and delivery PIN code. For valves include body/trim, seats, service fluid, temperature, end connection and actuator. For fasteners include thread, pitch, length, property class and coating.
For a village, small town or large city, give the district, nearest transport depot and unloading arrangements. Stock, suitability, freight and delivery are confirmed for each order.
Prepare your material enquiry Delivery checklistCommon questions
Are every size and class combination available?
No. The charts preserve the published combinations and label manufacturer specials or conflicts. “Not listed” is not a zero dimension and is not permission to interpolate a missing size.
Are inch fasteners interchangeable with converted metric sizes?
No. Converting an inch diameter for display does not change its thread series or fit. Order the specified thread, pitch or TPI, tolerance class, length convention and material.
What should a bulk buyer send for a quotation?
Send the exact standard and edition, grade or class, complete dimensions, quantity, finish, certification and delivery town, district and PIN code. Include the nearest transport depot for village or small-town delivery. Availability, price, freight and delivery are confirmed against your enquiry.
Reference sources and corrections · Toolkit terms. Source scope, units and missing values remain part of every reference. A catalogue listing is not a stock guarantee, approval for substitution or brand affiliation.