# Forged threaded fittings (ASME B16.11), Class 2000 / 3000 / 6000: elbows, tees, caps — centre-to-end, band OD, thread length

> What are the dimensions of a Class 3000 threaded elbow, tee or cap (centre-to-end, outside diameter, thread length)?

- Category: Tri-clamp & pipe › Pipe, tube & threads
- Kind: Standard part
- Basis: Wermac's ASME B16.11 threaded tables (mm: elbows, tees, caps), cross-checked against the maker's inch catalog (Smith-Cooper 42-series); numbers and Xem-drawn envelopes
- Page: https://xemstudio.com/objects/forged-threaded-fittings-b16-11/ · JSON: https://xemstudio.com/api/geometry?object=forged-threaded-fittings-b16-11 · Plain text: https://xemstudio.com/objects/forged-threaded-fittings-b16-11/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.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- B16.11 threaded fittings (NPT per ASME B1.20.1): B is the minimum length of perfect thread, J the minimum length of useful thread (B plus threads with fully formed roots and flat crests), D the outside diameter of the band, G the minimum wall and A the centre-to-end of a 90° elbow or tee; C is the 45° centre-to-end. Wermac's page itself defines only B and J and orders the other columns by header position, so the letter mapping is a reading; it is confirmed by the maker: Smith-Cooper's elbow A and B (inches) equal Wermac's A and D for Class 3000 NPS 1/2 to 4 and Class 6000 NPS 1/2 to 3 within 1.5 mm (NPS 2 Class 3000: A 64 / D 84 mm vs 2.50 / 3.31 in = 63.5 / 84.1). The 'check' column shows the inch comparison.
- Dropped: Wermac's Class 6000 NPS 4 elbow row (D 152, A 114, C 79) repeats the Class 3000 NPS 4 row exactly, while the Class 6000 rows from NPS 1/2 to 2-1/2 equal the next size's Class 3000 D, A and C (and NPS 3 is 146 / 106 / 79); the value is not used. The maker's 6000 series stops at NPS 3 for elbows.
- Disagreement shown, not resolved: Class 3000 NPS 3/4 cap OD is printed '35.' by Wermac and 1.33 in (33.8 mm) by Smith-Cooper (all other cap ODs agree within 1 mm), so no 3/4 cap file is drawn. Tees use the same centre-to-end A as the 90° elbow (Wermac's tee table repeats the elbow columns).
- Class 2000 is Wermac only (no maker cross-check read) and is table-only. Couplings: Wermac's threaded-coupling page was not available; Smith-Cooper's A and B (inches) are shown as printed, but the catalog text does not define which is the length and which the OD, so no coupling file is drawn.
- Files (Xem-drawn envelopes): cylinders of the published band OD D meeting at a sphere of the same radius at the centre, out to the published centre-to-end; caps are a cylinder of OD D and length A with a plain blind bore of depth J. Threads are plain bores: the bore is the NPT tap-drill size (Ø18.3 for 1/2, Ø23.4 for 3/4, Ø29.4 for 1; from ANSI/ASME B1.20.1 as listed on npt-bsp-thread-envelopes). Taper, thread form and the true outer shape (the real band and hexagon-like body of a forged elbow) are not drawn; those are not published as numbers in the sources read. Sizes are 1/2 to 1 only because the tap-drill table on this site stops at NPS 1.
- Threaded fittings take male NPT pipe directly (pipe thread sealant, no socket): see npt-bsp-thread-envelopes for the male side.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| plain bore (NPT tap-drill size, thread not drawn) | Ø18.3 (1/2), Ø23.4 (3/4), Ø29.4 (1) mm | tap with an NPT tap to ANSI/ASME B1.20.1 for the male pipe thread on npt-bsp-thread-envelopes (taper 1:16) | designed | thd-* |
| body OD / centre-to-end | Class 3000 1/2: OD 38, A 33; 1: OD 56, A 44; Class 6000 1/2: OD 46, A 38 | nothing: free-standing fitting; centre-to-end is the set-back for the next component | designed | thd-* |

## Sizes

| part | class | NPS | elbow/tee: B min perfect thread | cap: length A | elbow/tee: J useful thread | cap: OD D (mm) | elbow/tee: D band OD | cap: min wall G | elbow/tee: G min wall | cap: B thread | elbow/tee: A 90° | cap: J thread | elbow/tee: C 45° | cap: — | check vs maker (in): elbow/tee A / OD; cap A / OD |
|---|---|---|---|---|---|---|---|---|---|
| elbow / tee | 2000 | 1/2 | 10.9 | 13.6 | 33 | 3.18 | 28 | 22 | — |
| elbow / tee | 2000 | 3/4 | 12.7 | 13.9 | 38 | 3.18 | 33 | 25 | — |
| elbow / tee | 2000 | 1 | 14.7 | 17.3 | 46 | 3.68 | 38 | 28 | — |
| elbow / tee | 2000 | 1-1/4 | 17 | 18 | 56 | 3.89 | 44 | 33 | — |
| elbow / tee | 2000 | 1-1/2 | 17.8 | 18.4 | 62 | 4.01 | 51 | 35 | — |
| elbow / tee | 2000 | 2 | 19 | 19.2 | 75 | 4.27 | 60 | 43 | — |
| elbow / tee | 2000 | 2-1/2 | 23.6 | 28.9 | 92 | 5.61 | 76 | 52 | — |
| elbow / tee | 2000 | 3 | 25.9 | 30.5 | 109 | 5.99 | 86 | 64 | — |
| elbow / tee | 2000 | 4 | 27.7 | 33 | 146 | 6.55 | 106 | 79 | — |
| elbow / tee | 3000 | 1/2 | 10.9 | 13.6 | 38 | 4.09 | 33 | 25 | 1.30 / 1.50 vs 1.31 / 1.50 |
| elbow / tee | 3000 | 3/4 | 12.7 | 13.9 | 46 | 4.32 | 38 | 28 | 1.50 / 1.81 vs 1.50 / 1.81 |
| elbow / tee | 3000 | 1 | 14.7 | 17.3 | 56 | 4.98 | 44 | 33 | 1.73 / 2.20 vs 1.75 / 2.19 |
| elbow / tee | 3000 | 1-1/4 | 17 | 18 | 62 | 5.28 | 51 | 35 | 2.01 / 2.44 vs 2.00 / 2.44 |
| elbow / tee | 3000 | 1-1/2 | 17.8 | 18.4 | 75 | 5.56 | 60 | 43 | 2.36 / 2.95 vs 2.38 / 2.97 |
| elbow / tee | 3000 | 2 | 19 | 19.2 | 84 | 7.14 | 64 | 44 | 2.52 / 3.31 vs 2.50 / 3.31 |
| elbow / tee | 3000 | 2-1/2 | 23.6 | 28.9 | 102 | 7.65 | 83 | 52 | 3.27 / 4.02 vs 3.25 / 4.00 |
| elbow / tee | 3000 | 3 | 25.9 | 30.5 | 121 | 8.84 | 95 | 64 | 3.74 / 4.76 vs 3.75 / 4.75 |
| elbow / tee | 3000 | 4 | 27.7 | 33 | 152 | 11.18 | 114 | 79 | 4.49 / 5.98 vs 4.50 / 6.00 |
| elbow / tee | 6000 | 1/2 | 10.9 | 13.6 | 46 | 8.15 | 38 | 28 | 1.50 / 1.81 vs 1.50 / 1.81 |
| elbow / tee | 6000 | 3/4 | 12.7 | 13.9 | 56 | 8.53 | 44 | 33 | 1.73 / 2.20 vs 1.75 / 2.19 |
| elbow / tee | 6000 | 1 | 14.7 | 17.3 | 62 | 9.93 | 51 | 35 | 2.01 / 2.44 vs 2.00 / 2.44 |
| elbow / tee | 6000 | 1-1/4 | 17 | 18 | 75 | 10.59 | 60 | 43 | 2.36 / 2.95 vs 2.38 / 2.97 |
| elbow / tee | 6000 | 1-1/2 | 17.8 | 18.4 | 84 | 11.07 | 64 | 44 | 2.52 / 3.31 vs 2.50 / 3.31 |
| elbow / tee | 6000 | 2 | 19 | 19.2 | 102 | 12.09 | 83 | 52 | 3.27 / 4.02 vs 3.25 / 4.00 |
| elbow / tee | 6000 | 2-1/2 | 23.6 | 28.9 | 121 | 15.29 | 95 | 64 | — |
| elbow / tee | 6000 | 3 | 25.9 | 30.5 | 146 | 16.64 | 106 | 79 | 4.17 / 5.75 vs 4.13 / 5.69 |
| cap | 3000 | 1/2 | 32 | 28 | 6.4 | 10.9 | 13.6 | — | 1.26 / 1.10 vs 1.25 / 1.12 |
| cap | 3000 | 3/4 | 37 | 35 (printed '35.') vs maker 1.33 in = 33.8 | 6.4 | 12.7 | 13.9 | — | 1.46 / 1.38 vs 1.44 / 1.33 |
| cap | 3000 | 1 | 41 | 44 | 9.7 | 14.7 | 17.3 | — | 1.61 / 1.73 vs 1.62 / 1.75 |
| cap | 3000 | 1-1/4 | 44 | 57 | 9.7 | 17 | 18 | — | 1.73 / 2.24 vs 1.75 / 2.25 |
| cap | 3000 | 1-1/2 | 44 | 64 | 11.2 | 17.8 | 18.4 | — | 1.73 / 2.52 vs 1.75 / 2.50 |
| cap | 3000 | 2 | 48 | 76 | 12.7 | 19 | 19.2 | — | 1.89 / 2.99 vs 1.88 / 3.00 |
| cap | 3000 | 2-1/2 | 60 | 92 | 15.7 | 23.6 | 28.9 | — | 2.36 / 3.62 vs 2.38 / 3.62 |
| cap | 3000 | 3 | 65 | 108 | 19 | 25.9 | 30.5 | — | 2.56 / 4.25 vs 2.56 / 4.25 |
| cap | 3000 | 4 | 68 | 140 | 22.4 | 27.7 | 33 | — | 2.68 / 5.51 vs 2.69 / 5.50 |
| cap | 6000 | 1/2 | 33 | 38 | 7.9 | 10.9 | 13.6 | — | 1.30 / 1.50 vs 1.31 / 1.50 |
| cap | 6000 | 3/4 | 38 | 44 | 7.9 | 12.7 | 13.9 | — | 1.50 / 1.73 vs 1.50 / 1.75 |
| cap | 6000 | 1 | 43 | 57 | 11.2 | 14.7 | 17.3 | — | 1.69 / 2.24 vs 1.69 / 2.25 |
| cap | 6000 | 1-1/4 | 46 | 64 | 11.2 | 17 | 18 | — | 1.81 / 2.52 vs 1.81 / 2.50 |
| cap | 6000 | 1-1/2 | 48 | 76 | 12.7 | 17.8 | 18.4 | — | 1.89 / 2.99 vs 1.88 / 3.00 |
| cap | 6000 | 2 | 51 | 92 | 15.7 | 19 | 19.2 | — | 2.01 / 3.62 vs 2.00 / 3.62 |
| cap | 6000 | 2-1/2 | 64 | 108 | 19 | 23.6 | 28.9 | — | — |
| cap | 6000 | 3 | 68 | 127 | 22.4 | 25.9 | 30.5 | — | — |
| cap | 6000 | 4 | 75 | 159 | 28.4 | 27.7 | 33 | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 1/2 | 1.12 | 1.88 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 3/4 | 1.33 | 2.00 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 1 | 1.75 | 2.38 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 1-1/4 | 2.25 | 2.62 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 1-1/2 | 2.50 | 3.12 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 2 | 3.00 | 3.38 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 2-1/2 | 3.62 | 3.62 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 3 | 4.25 | 4.25 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 3000 | 4 | 5.50 | 4.75 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 6000 | 1/2 | 1.50 | 1.88 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 6000 | 3/4 | 1.75 | 2.00 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 6000 | 1 | 2.25 | 2.38 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 6000 | 1-1/4 | 2.50 | 2.62 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 6000 | 1-1/2 | 3.00 | 3.12 | — | — | — | — | — |
| coupling (maker A, B as printed, in; letters undefined) | 6000 | 2 | 3.62 | 3.38 | — | — | — | — | — |

## Where the files are

- Wermac: [ASME B16.11 threaded elbows 90 / 45 deg, Class 2000, 3000, 6000 (mm)](https://wermac.org/fittings/dim_thd_elbows.html) — web — Publisher's page; dimensions are facts
- Wermac: [ASME B16.11 threaded tees and crosses, Class 2000, 3000, 6000 (mm)](https://wermac.org/fittings/dim_thd_tees.html) — web — Publisher's page; dimensions are facts
- Wermac: [ASME B16.11 threaded end caps, Class 3000 and 6000 (mm)](https://wermac.org/fittings/dim_thd_caps.html) — web — Publisher's page; dimensions are facts
- Smith-Cooper (maker), via buyfittingsonline.com: [Forged carbon steel fittings, Class 3000 / 6000, threaded (42-series) and socket weld (52-series): elbows, tees, couplings, caps; dimensions A and B in inches (letters not defined in the text read)](https://www.buyfittingsonline.com/content/pipe-fittings-forged-carbon-steel-specifications-sizing-3000-6000-lb.pdf) — web — Maker catalog; numbers only
- Bonney Forge (maker): [Forged steel fittings CAD (socket weld 3000 and others; 3D models per part)](https://cad.bonneyforge.com/printitem/forged-steel-fittings-unions/category-1108/3000-socket-weld-1) — CAD — Maker's site terms: check before use (verify at link)
- Bonney Forge (maker): [Forged steel fittings catalog F9-2012 (socket weld and threaded elbows, tees, couplings, caps; ASME B16.11); read for its scope only, its tables were not used (the extract disagreed with the other two sources)](https://bonneyforge.com/assets/files/FSFU.pdf) — web — Maker catalog
- ANSI Webstore (standard body storefront): [ASME B16.11-2016 Forged Fittings, Socket-Welding and Threaded (the standard itself is paywalled; listing only)](https://webstore.ansi.org/standards/asme/asmeb16112016) — web — Storefront page

## Free STEP/STL (13 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/index.json

- thd-elbow-90-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c3000-nps0p5.stl) — NPS 1/2 Class 3000 threaded 90° elbow envelope: body OD Ø38, centre-to-end 33, plain bore Ø18.3 (NPT tap-drill size; thread not drawn)
- thd-elbow-90-c3000-nps0p75: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c3000-nps0p75.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c3000-nps0p75.stl) — NPS 3/4 Class 3000 threaded 90° elbow envelope: body OD Ø46, centre-to-end 38, plain bore Ø23.4 (NPT tap-drill size; thread not drawn)
- thd-elbow-90-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c3000-nps1.stl) — NPS 1 Class 3000 threaded 90° elbow envelope: body OD Ø56, centre-to-end 44, plain bore Ø29.4 (NPT tap-drill size; thread not drawn)
- thd-elbow-90-c6000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c6000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c6000-nps0p5.stl) — NPS 1/2 Class 6000 threaded 90° elbow envelope: body OD Ø46, centre-to-end 38, plain bore Ø18.3 (NPT tap-drill size; thread not drawn)
- thd-elbow-90-c6000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c6000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-90-c6000-nps1.stl) — NPS 1 Class 6000 threaded 90° elbow envelope: body OD Ø62, centre-to-end 51, plain bore Ø29.4 (NPT tap-drill size; thread not drawn)
- thd-elbow-45-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-45-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-45-c3000-nps0p5.stl) — NPS 1/2 Class 3000 threaded 45° elbow envelope (arms 135° apart): body OD Ø38, centre-to-end 25, plain bore Ø18.3 (NPT tap-drill size; thread not drawn)
- thd-elbow-45-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-45-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-elbow-45-c3000-nps1.stl) — NPS 1 Class 3000 threaded 45° elbow envelope (arms 135° apart): body OD Ø56, centre-to-end 33, plain bore Ø29.4 (NPT tap-drill size; thread not drawn)
- thd-tee-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-tee-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-tee-c3000-nps0p5.stl) — NPS 1/2 Class 3000 threaded tee envelope: body OD Ø38, centre-to-end 33 on run and branch, plain bore Ø18.3 (NPT tap-drill size; thread not drawn)
- thd-tee-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-tee-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-tee-c3000-nps1.stl) — NPS 1 Class 3000 threaded tee envelope: body OD Ø56, centre-to-end 44 on run and branch, plain bore Ø29.4 (NPT tap-drill size; thread not drawn)
- thd-cap-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c3000-nps0p5.stl) — NPS 1/2 Class 3000 threaded cap envelope: OD Ø28, length 32, blind plain bore Ø18.3 × 13.6 deep (useful thread length J; NPT tap-drill size, thread not drawn)
- thd-cap-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c3000-nps1.stl) — NPS 1 Class 3000 threaded cap envelope: OD Ø44, length 41, blind plain bore Ø29.4 × 17.3 deep (useful thread length J; NPT tap-drill size, thread not drawn)
- thd-cap-c6000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c6000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c6000-nps0p5.stl) — NPS 1/2 Class 6000 threaded cap envelope: OD Ø38, length 33, blind plain bore Ø18.3 × 13.6 deep (useful thread length J; NPT tap-drill size, thread not drawn)
- thd-cap-c6000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c6000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-threaded-fittings-b16-11/thd-cap-c6000-nps1.stl) — NPS 1 Class 6000 threaded cap envelope: OD Ø57, length 43, blind plain bore Ø29.4 × 17.3 deep (useful thread length J; NPT tap-drill size, thread not drawn)

## Questions

**What is the centre-to-end of a 1/2 inch Class 3000 threaded elbow?**

33 mm (1.31 in) for the 90° and 25 mm for the 45°; band OD 38 mm (1.50 in) (Wermac and Smith-Cooper agree).

**What is the minimum thread length on a 1/2 inch forged fitting?**

B (perfect thread) 10.9 mm and J (useful thread) 13.6 mm for NPS 1/2, the same in every class.

**How long is a 1 inch Class 3000 threaded cap?**

41 mm, OD 44 mm (Wermac); Smith-Cooper: 1.62 in long, 1.75 in OD.

## Fits with

- [Forged socket-weld fittings (ASME B16.11), Class 3000 and 6000: elbows, tees, couplings — socket bore, depth, centre-to-bottom](https://xemstudio.com/objects/forged-socket-weld-fittings-b16-11/)
- [Malleable iron threaded fittings, Class 150 (ASME B16.3): elbow, tee, coupling and union dimensions, NPS 1/8 to 6](https://xemstudio.com/objects/malleable-iron-fittings-class-150/)
- [NPT male thread envelopes 1/8 to 1 in (ASME B1.20.1)](https://xemstudio.com/objects/npt-thread-envelopes/)
- [Schedule 40 pipe and PVC fittings, 1/2 to 2 inch](https://xemstudio.com/objects/schedule-40-pipe/)
- [Butt-weld elbows, 90° and 45° long radius (ASME B16.9), NPS ½ to 12](https://xemstudio.com/objects/butt-weld-elbows-long-radius/)
- [NPT pipe thread dimensions (ASME B1.20.1): TPI, E0, E1, L1, L2 and tap drill, NPS 1/8 to 6 + male NPT end STEP/STL](https://xemstudio.com/objects/npt-thread-dimensions-asme-b1-20-1/)