Malleable iron threaded fittings, Class 150 (ASME B16.3): elbow, tee, coupling and union dimensions, NPS 1/8 to 6 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/malleable-iron-fittings-class-150/ (sheet CC BY 4.0) Basis: Anvil International's published spec sheets (FIG. 3101 90° elbow, 3102 45° elbow, 3105 tee, 3121 coupling, 463 union) and Smith-Cooper's catalogs for tee and coupling outside diameters; inches, with mm as printed by Anvil or converted at 25.4 Catalog version: 2026-10-20 Sizes: see table below - Class 150 'standard' malleable iron fittings (ASTM A197, NPT threads per ASME B1.20.1) are made to ASME B16.3; unions are ASME B16.39. Anvil prints one dimension per figure: A, the centre to the end of the threaded opening for elbows and tees, and the end-to-end length for the coupling. Smith-Cooper's catalogs agree with Anvil for the 90° tee A and the coupling length for every size they share (for example NPS 1/2: 1.12 in tee, 1.34 in coupling). - Smith-Cooper also prints the outside diameter of the tee (B) and the minimum outside diameter of the coupling (A): NPS 1/2 tee OD 1.20 in, NPS 1 1.77 in, NPS 2 2.96 in. They are the same series, so the coupling OD min equals the tee B for NPS 1/8 to 5. A 6 in coupling is printed 7.36 in against a 7.77 in tee band; that row is left out of the coupling column and flagged here. Nominal cast wall thickness is also printed (0.10 in at 1/2, 0.17 in at 2); it is the wall away from the threads and the thread-end walls are thicker, so it is not used to draw a bore. - Not tabulated by Anvil's sheets read: elbow and tee outside diameters from Anvil (Smith-Cooper's OD above is used), 3-1/2 and 5 in elbows (Anvil omits them), and Class 300 (the 300 lb series is a separate B16.3 table). Anvil's sheets stop at NPS 6, Smith-Cooper at NPS 8 for tees. The union column is Anvil FIG. 463 (bronze-to-iron seat, Class 150, ASME B16.39), end-to-end in mm as printed with the inch fraction; B16.39 is its own standard, not B16.3. - Files: Class 150 straight tees and couplings at NPS 1/4, 1/2, 3/4 and 1: Xem-drawn envelopes of the published values. The tee is cylinders of the maker's outside diameter B meeting at a sphere, out to A on run and branch; the coupling is a tube of the maker's minimum OD and the published end-to-end length. Threads are plain bores: the bore is the NPT tap-drill size from npt-bsp-thread-envelopes (Ø11.1 / 18.3 / 23.4 / 29.4 mm), thread and band are not drawn. Elbows have no file: the elbow outside diameter is not printed in the sheets read. - Why sizes stop at 1 in for files: the tap-drill table this site already carries (npt-bsp-thread-envelopes) ends at 1 in; larger sizes would need NPT tap-drill sizes from a source read. Dimensions in the table cover every size the sheets print. - Several Smith-Cooper coupling inside-diameter entries are plain misprints (a 4 in coupling is printed with an inside diameter of 0.54 / 0.58 in) and are not used. NPS 90° elbow A, in (mm) 45° elbow A, in (mm) tee A, in (mm) tee OD B, in (mm) nominal cast wall, in coupling end-to-end, in (mm) coupling OD min, in (mm) union end-to-end (Fig. 463) 1/8 0.69 (17.5) 0.63 (16.0) 0.69 (17.5) 0.69 (17.5) 0.09 0.96 (24.4) 0.69 (17.5) 33 mm (1 5/16 in) 1/4 0.81 (20.6) 0.73 (18.5) 0.81 (20.6) 0.84 (21.3) 0.09 1.06 (26.9) 0.84 (21.3) 47 mm (1 13/16 in) 3/8 0.95 (24.1) 0.80 (20.3) 0.95 (24.1) 1.01 (25.7) 0.10 1.16 (29.5) 1.01 (25.7) 47 mm (1 13/16 in) 1/2 1.12 (28.4) 0.88 (22.4) 1.12 (28.4) 1.20 (30.5) 0.10 1.34 (34.0) 1.20 (30.5) 49 mm (1 15/16 in) 3/4 1.31 (33.3) 0.98 (24.9) 1.31 (33.3) 1.46 (37.1) 0.12 1.52 (38.6) 1.46 (37.1) 52 mm (2 1/16 in) 1 1.50 (38.1) 1.12 (28.4) 1.50 (38.1) 1.77 (45.0) 0.13 1.67 (42.4) 1.77 (45.0) 62 mm (2 7/16 in) 1-1/4 1.75 (44.4) 1.29 (32.8) 1.75 (44.4) 2.15 (54.6) 0.14 1.93 (49.0) 2.15 (54.6) 67 mm (2 5/8 in) 1-1/2 1.94 (49.3) 1.43 (36.3) 1.94 (49.3) 2.43 (61.7) 0.15 2.15 (54.6) 2.43 (61.7) 70 mm (2 3/4 in) 2 2.25 (57.1) 1.68 (42.7) 2.25 (57.1) 2.96 (75.2) 0.17 2.53 (64.3) 2.96 (75.2) 75 mm (2 15/16 in) 2-1/2 2.70 (68.6) 1.95 (49.5) 2.70 (68.6) 3.59 (91.2) 0.21 2.88 (73.2) 3.59 (91.2) 92 mm (3 5/8 in) 3 3.08 (78.2) 2.17 (55.1) 3.08 (78.2) 4.28 (108.7) 0.23 3.18 (80.8) 4.28 (108.7) 95 mm (3 3/4 in) 3-1/2 — — 3.42 (86.9) 4.84 (122.9) 0.25 3.50 (88.9) 4.84 (122.9) — 4 3.79 (96.3) 2.61 (66.3) 3.79 (96.3) 5.40 (137.2) 0.26 3.69 (93.7) 5.40 (137.2) — 5 — — 4.50 (114.3) 6.58 (167.1) 0.30 — — — 6 5.13 (130.3) 3.46 (87.9) 5.13 (130.3) 7.77 (197.4) 0.34 — — — 8 — — 6.50 (165.1) 9.76 (247.9) 0.39 — — — Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Anvil International (maker): Class 150 malleable iron FIG. 3101 90 deg elbow: dimension A — web — Maker spec sheet; numbers only — https://econtent.adhq.com/dam/Original/608/Anvil_0810002618_Specification_Sheet.pdf - Anvil International (maker): Class 150 malleable iron FIG. 3102 45 deg elbow: dimension A — web — Maker spec sheet; numbers only — https://res.cloudinary.com/dzhpkjoqj/TradeService/ASCEngineeredSolutions-AnvilSPF_00003_1_SPEC.pdf - Anvil International (maker): Class 150 malleable iron FIG. 3105 straight tee: dimension A — web — Maker spec sheet; numbers only — https://res.cloudinary.com/dzhpkjoqj/TradeService/ASCEngineeredSolutions-AnvilSPF_00008_1_SPEC.pdf - Anvil International (maker): Class 150 malleable iron FIG. 3121 coupling: dimension A (end to end) — web — Maker spec sheet; numbers only — https://res.cloudinary.com/dzhpkjoqj/TradeService/ASCEngineeredSolutions-Anvil_00189_1_SPEC.pdf - Smith-Cooper (maker), via buyfittingsonline.com: Malleable iron Class 150 straight tee (ASME B16.3): centre to end A, outside diameter B, nominal metal thickness, NPS 1/8 to 8 — web — Maker catalog; numbers only — https://www.buyfittingsonline.com/content/Malleable-Iron-150-SM-Straight-Tees.pdf - Smith-Cooper (maker), via buyfittingsonline.com: Malleable iron Class 150 banded full coupling (ASME B16.3): outside diameter min A, inside diameter B, end to end C, internal thread length D, NPS 1/8 to 6 — web — Maker catalog; numbers only (several of its inside-diameter entries are misprints and are not used) — https://www.buyfittingsonline.com/content/Malleable-Iron-150-SM-Banded-Full-Couplings.pdf - Anvil International (maker), via hvacdiscounters.com: Malleable iron unions FIG. 463 (Class 150) and 554 (Class 250), ASME B16.39: end-to-end length by NPS — web — Maker datasheet PF-11.13; numbers only — https://www.hvacdiscounters.com/customer/docs/skudocs/mal-union.pdf - Anvil / ASC Engineered Solutions (maker): BIM/CAD library: Class 150 malleable iron threaded fittings (per-figure 3D CAD) — CAD, BIM — Maker's site terms: check before use [verify license at link] — https://bimcadshare.asc-es.com/category/mi-threaded-fittings-class-150 - ANSI Webstore (standard body storefront): ASME B16.3-2016 Malleable Iron Threaded Fittings, Classes 150 and 300 (paywalled; listing only) — web — Storefront page — https://webstore.ansi.org/Standards/ASME/ASMEB162016 Free files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/malleable-iron-fittings-class-150/index.json API: https://xemstudio.com/api/geometry?object=malleable-iron-fittings-class-150