# Butt-weld elbows, 90° and 45° long radius (ASME B16.9), NPS ½ to 12 > What is the centre-to-end of a 90° and 45° long-radius butt-weld elbow (ASME B16.9)? - Category: Tri-clamp & pipe › Pipe, tube & threads - Kind: Standard part - Basis: ASME B16.9 dimensions as published in manufacturer tables (SHIELD, mm; Weldbend, inch); OD and Sch 40 wall per ASME B36.10 - Page: https://xemstudio.com/objects/butt-weld-elbows-long-radius/ · JSON: https://xemstudio.com/api/geometry?object=butt-weld-elbows-long-radius · Plain text: https://xemstudio.com/objects/butt-weld-elbows-long-radius/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license - Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/) **Exact dimensions.** True size, with no printing tolerance added. ## Notes - A long-radius (LR) elbow has a bend radius of 1.5 × NPS from NPS ¾ up (1½ in at NPS ½ and ¾). Centre-to-end is from the intersection of the two pipe axes to the weld end; for a 90° LR elbow it equals the bend radius. - Values are the manufacturers' published B16.9 tables (the standard's own text is paywalled): mm from SHIELD, inch from Weldbend (90° all sizes, 45° to NPS 2). - Files at NPS 1, 2 and 4, Schedule 40 hollow. The 45° elbow's bend radius is not tabulated separately: the files use the 90° LR radius and add a short straight at each end to reach the published 45° centre-to-end (tangent noted per file). - OD and Schedule 40 wall: Weldbend prints OD rounded (1.32, 2.38 in); the files use the exact ASME B36.10 OD (1.315, 2.375, 4.500 in) with the Weldbend Sch 40 wall (.133, .154, .237 in). Fittings are made to match the pipe's OD and wall. - Ends are drawn square. Real fittings are bevelled for welding to ASME B16.25; no public, citable statement of the bevel was found, so it is not drawn. ## Sizes | NPS | OD, mm | Sch 40 wall | 90° LR centre-to-end A, mm | 45° LR centre-to-end B, mm | |---|---|---|---|---| | 1/2 | 21.3 (0.84 in) | 0.109 in (2.77 mm) | 38 (1.50 in) | 16 (0.62 in) | | 3/4 | 26.7 (1.05 in) | 0.113 in (2.87 mm) | 38 (1.50 in) | 19 (0.75 in) | | 1 | 33.4 (1.32 in) | 0.133 in (3.38 mm) | 38 (1.50 in) | 22 (0.88 in) | | 1-1/4 | 42.2 (1.66 in) | 0.140 in (3.56 mm) | 48 (1.88 in) | 25 (1.00 in) | | 1-1/2 | 48.3 (1.90 in) | 0.145 in (3.68 mm) | 57 (2.25 in) | 29 (1.12 in) | | 2 | 60.3 (2.38 in) | 0.154 in (3.91 mm) | 76 (3.00 in) | 35 (1.38 in) | | 2-1/2 | 73.0 (2.88 in) | 0.203 in (5.16 mm) | 95 (3.75 in) | 44 | | 3 | 88.9 (3.50 in) | 0.216 in (5.49 mm) | 114 (4.50 in) | 51 | | 3-1/2 | 101.6 (4.00 in) | 0.226 in (5.74 mm) | 133 (5.25 in) | 57 | | 4 | 114.3 (4.50 in) | 0.237 in (6.02 mm) | 152 (6.00 in) | 64 | | 5 | 141.3 (5.56 in) | 0.258 in (6.55 mm) | 190 (7.50 in) | 79 | | 6 | 168.3 (6.62 in) | 0.280 in (7.11 mm) | 229 (9.00 in) | 95 | | 8 | 219.1 (8.62 in) | 0.322 in (8.18 mm) | 305 (12.00 in) | 127 | | 10 | 273.0 (10.75 in) | 0.365 in (9.27 mm) | 381 (15.00 in) | 159 | | 12 | 323.8 (12.75 in) | 0.406 in (10.31 mm) | 457 (18.00 in) | 190 | ## Where the files are - SHIELD (manufacturer): [Butt-welded fittings & flanges, SG-BWFF: ASME B16.9 elbows, tees, reducers (mm)](https://www.naffco.com/media-downloads/pdf/buttwelded.pdf) — web — Publisher's page; dimensions are facts - Weldbend Corporation: [Weld fitting & weld flange catalog, 63rd edition: 90° and 45° long-radius elbows, OD, STD / Sch 40 wall](https://acceldx.roccommercecloud.com/assets/86/84/86841a47-ae63-4c4d-9881-ceba74db0969/Weldbend_131010000_Catalog.pdf) — web — Publisher's page; dimensions are facts ## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/index.json - bw-elbow-90-lr-nps1-sch40: [STEP](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps1-sch40.step) · [STL](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps1-sch40.stl) — NPS 1 90° long-radius elbow, Sch 40: OD 33.40, ID 26.64, centre-to-end 1.50 in (38.1 mm); square ends - bw-elbow-45-lr-nps1-sch40: [STEP](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps1-sch40.step) · [STL](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps1-sch40.stl) — NPS 1 45° long-radius elbow, Sch 40: OD 33.40, ID 26.64, centre-to-end 22 mm; bend radius 38.1 mm with 6.22 mm straight at each end; square ends - bw-elbow-90-lr-nps2-sch40: [STEP](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps2-sch40.step) · [STL](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps2-sch40.stl) — NPS 2 90° long-radius elbow, Sch 40: OD 60.32, ID 52.50, centre-to-end 3.00 in (76.2 mm); square ends - bw-elbow-45-lr-nps2-sch40: [STEP](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps2-sch40.step) · [STL](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps2-sch40.stl) — NPS 2 45° long-radius elbow, Sch 40: OD 60.32, ID 52.50, centre-to-end 35 mm; bend radius 76.2 mm with 3.44 mm straight at each end; square ends - bw-elbow-90-lr-nps4-sch40: [STEP](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps4-sch40.step) · [STL](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-90-lr-nps4-sch40.stl) — NPS 4 90° long-radius elbow, Sch 40: OD 114.30, ID 102.26, centre-to-end 6.00 in (152.4 mm); square ends - bw-elbow-45-lr-nps4-sch40: [STEP](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps4-sch40.step) · [STL](https://xemstudio.com/files/hardware/butt-weld-elbows-long-radius/bw-elbow-45-lr-nps4-sch40.stl) — NPS 4 45° long-radius elbow, Sch 40: OD 114.30, ID 102.26, centre-to-end 64 mm; bend radius 152.4 mm with 0.87 mm straight at each end; square ends ## Questions **What is the centre-to-end of a 2 in 90° LR weld elbow?** 3 in (76 mm); 45° LR: 35 mm (1.38 in). **What is the centre-to-end of a 4 in 90° LR weld elbow?** 6 in (152 mm); 45° LR: 64 mm. ## Fits with - [Butt-weld equal tees (ASME B16.9), NPS ½ to 12](https://xemstudio.com/objects/butt-weld-equal-tees/) - [Butt-weld reducers, concentric and eccentric (ASME B16.9), NPS ¾ to 12](https://xemstudio.com/objects/butt-weld-reducers/) - [Schedule 40 pipe and PVC fittings, 1/2 to 2 inch](https://xemstudio.com/objects/schedule-40-pipe/) - [Sanitary clamp elbows, 90° and 45°, ½ to 4 in (tri-clamp style, BPE)](https://xemstudio.com/objects/sanitary-clamp-elbows/)