Butt-weld reducers, concentric and eccentric (ASME B16.9), NPS ¾ to 12 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/butt-weld-reducers/ (sheet CC BY 4.0) Basis: ASME B16.9 dimensions as published in SHIELD's manufacturer table (mm); OD and Sch 40 wall per ASME B36.10 (Weldbend) Catalog version: 2026-10-20 Sizes: see table below - Concentric and eccentric reducers share the same end-to-end length H for each size pair. An eccentric reducer keeps one side straight (flat side down in a pump suction, up for drainage). - Files: 2 × 1 and 4 × 2, concentric and eccentric, Schedule 40 at each end. The shape of the transition is the manufacturer's: the files run a straight cone over the full length between the two ends. - 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. size, NPS large-end OD, mm small-end OD, mm end-to-end H, mm 3/4 × 3/8 26.7 17.3 38 3/4 × 1/2 26.7 21.3 38 1 × 1/2 33.4 21.3 51 1 × 3/4 33.4 26.7 51 1-1/4 × 1/2 42.2 21.3 51 1-1/4 × 3/4 42.2 26.7 51 1-1/4 × 1 42.2 33.4 51 1-1/2 × 1/2 48.3 21.3 64 1-1/2 × 3/4 48.3 26.7 64 1-1/2 × 1 48.3 33.4 64 1-1/2 × 1-1/4 48.3 42.2 64 2 × 3/4 60.3 26.7 76 2 × 1 60.3 33.4 76 2 × 1-1/4 60.3 42.2 76 2 × 1-1/2 60.3 48.3 76 2-1/2 × 1 73.0 33.4 89 2-1/2 × 1-1/4 73.0 42.2 89 2-1/2 × 1-1/2 73.0 48.3 89 2-1/2 × 2 73.0 60.3 89 3 × 1-1/4 88.9 42.2 89 3 × 1-1/2 88.9 48.3 89 3 × 2 88.9 60.3 89 3 × 2-1/2 88.9 73.0 89 3-1/2 × 1-1/4 101.6 42.2 102 3-1/2 × 1-1/2 101.6 48.3 102 3-1/2 × 2 101.6 60.3 102 3-1/2 × 2-1/2 101.6 73.0 102 3-1/2 × 3 101.6 88.9 102 4 × 1-1/2 114.3 48.3 102 4 × 2 114.3 60.3 102 4 × 2-1/2 114.3 73.0 102 4 × 3 114.3 88.9 102 4 × 3-1/2 114.3 101.6 102 5 × 2 141.3 60.3 127 5 × 2-1/2 141.3 73.0 127 5 × 3 141.3 88.9 127 5 × 3-1/2 141.3 101.6 127 5 × 4 141.3 114.3 127 6 × 2-1/2 168.3 73.0 140 6 × 3 168.3 88.9 140 6 × 3-1/2 168.3 101.6 140 6 × 4 168.3 114.3 140 6 × 5 168.3 141.3 140 8 × 3-1/2 219.1 101.6 152 8 × 4 219.1 114.3 152 8 × 5 219.1 141.3 152 8 × 6 219.1 168.3 152 10 × 4 273.0 114.3 178 10 × 5 273.0 141.3 178 10 × 6 273.0 168.3 178 10 × 8 273.0 219.1 178 12 × 5 323.8 141.3 203 12 × 6 323.8 168.3 203 12 × 8 323.8 219.1 203 12 × 10 323.8 273.0 203 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - SHIELD (manufacturer): Butt-welded fittings & flanges, SG-BWFF: ASME B16.9 elbows, tees, reducers (mm) — web — Publisher's page; dimensions are facts — https://www.naffco.com/media-downloads/pdf/buttwelded.pdf - Weldbend Corporation: Weld fitting & weld flange catalog, 63rd edition: 90° and 45° long-radius elbows, OD, STD / Sch 40 wall — web — Publisher's page; dimensions are facts — https://acceldx.roccommercecloud.com/assets/86/84/86841a47-ae63-4c4d-9881-ceba74db0969/Weldbend_131010000_Catalog.pdf Free files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/butt-weld-reducers/index.json API: https://xemstudio.com/api/geometry?object=butt-weld-reducers