# Forged socket-weld fittings (ASME B16.11), Class 3000 and 6000: elbows, tees, couplings — socket bore, depth, centre-to-bottom

> What are the socket dimensions of a Class 3000 socket-weld elbow, tee or coupling (bore, depth, centre-to-bottom)?

- Category: Tri-clamp & pipe › Pipe, tube & threads
- Kind: Standard part
- Basis: Wermac's ASME B16.11 socket-weld tables (mm: elbow, tee, coupling pages), cross-checked against the maker's inch catalog (Smith-Cooper 52-series); numbers and Xem-drawn envelopes
- Page: https://xemstudio.com/objects/forged-socket-weld-fittings-b16-11/ · JSON: https://xemstudio.com/api/geometry?object=forged-socket-weld-fittings-b16-11 · Plain text: https://xemstudio.com/objects/forged-socket-weld-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 socket-weld fittings take plain pipe in a socket: B is the socket bore (inside diameter of the socket), J the socket depth, D the bore of the fitting, C the socket wall, G the body wall and A the distance from the centre of the fitting to the bottom of the socket (centre-to-end = A + J). B, D and C are printed as two values, the first / second as headed in the table here (max / min as Wermac prints them). Wermac prints the letters in a different order on its coupling page; the tables here follow the elbow and tee pages, and the values are identical in all three.
- Cross-check: for every elbow, tee and coupling size A + J (converted to inches) lands within 0.04 in of the maker's overall centre-to-end A as Smith-Cooper prints it (the catalog text does not define its letters). Its elbow column B (read as the body width) compares with the drawn B(min) + 2 × C(min) as -0.8 to -0.2 mm for Class 3000 and -3.0 to -1.7 mm for Class 6000 (drawn minus printed). The coupling gap E (Wermac's laying-length column 'E', 9.5 / 13 / 19 mm) is the distance between the two socket bottoms: 2J + E is within 1 mm of Smith-Cooper's coupling length for all nine sizes (NPS 1/2: 29.5 mm vs 1.14 in = 29.0; NPS 4: 57 mm vs 2.25 in = 57.2). The 'check' columns below show the inch comparisons.
- Dropped as a misprint: Wermac prints D min = 46.4 for Class 3000 NPS 3 (next to D max 79.5); every other row has D min about 1.5–3 mm under D max, so the value is not used and no NPS 3 file is drawn. Tolerance of A as printed: ±1.5 mm (NPS 1/2 and 3/4), ±2 mm (NPS 1 to 2), ±2.5 mm (NPS 2-1/2 to 4).
- Files (Xem-drawn envelopes): a sphere and cylinders of outside diameter B(min) + 2 × C(min) meeting at the fitting centre, out to A + J on each arm; socket bore B(min) for the last J; bore D(min) from the socket bottom to the centre. The second printed value of B, C and D is used (the guaranteed minimum body; NPS 1/2 Class 3000: Ø29.9 drawn, the maker prints 1.20 in = 30.5 mm; the Class 6000 body is drawn smaller than the maker's by the range in the cross-check above). The true outside contour of a forged elbow or tee is not published as numbers, so the body is a cylinder-and-sphere envelope; the socket, the depth, the bore and the centre-to-bottom are the published values. Couplings: tube of that OD, length 2J + E.
- Half couplings, caps and reducing inserts are not tabulated here: the sources read give no defined centre dimension for them (Smith-Cooper A / B for socket-weld caps are printed without definitions).
- Socket bore vs pipe OD: Schedule 40 pipe OD is 21.34 / 26.67 / 33.40 / 42.16 / 48.26 / 60.33 mm at NPS 1/2 to 2, against socket bores of 21.70–21.95 / 27.05–27.30 / 33.80–34.05 / 42.55–42.80 / 48.65–48.90 / 61.10–61.35, i.e. 0.36–1.0 mm of clearance.

## 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 |
|---|---|---|---|---|
| socket bore B (min printed) | Ø21.70 (1/2), Ø33.80 (1), Ø61.10 (2) mm; depth J 10 / 13 / 16 | Schedule 40 pipe OD Ø21.34 / Ø33.40 / Ø60.33 (schedule-40-pipe), pipe seated to the socket bottom | socket | sw-* |
| flow bore D (min printed) | Class 3000: Ø15.0 / Ø25.9 / Ø51.7; Class 6000: Ø11.0 / Ø19.9 | pipe ID (Sch 40: 15.8 / 26.6 / 52.5): the fitting bore is smaller than the pipe bore by design | designed | sw-* |

## Sizes

| class | NPS | socket bore B max / min | socket depth J | bore D max / min | socket wall C max / min | body wall G | A 90° (centre to socket bottom) | A 45° | check: (A90+J) in vs maker A in | check: (A45+J) in vs maker A in | coupling gap E | check: coupling length 2J+E vs maker |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3000 | 1/2 | 21.95 / 21.70 | 10 | 16.6 / 15 | 4.65 / 4.10 | 3.75 | 15.5 | 11.5 | 1.00 vs 1.00 | 0.85 vs 0.82 | 9.5 | 29.5 (1.16 in) vs 1.14 in |
| 3000 | 3/4 | 27.30 / 27.05 | 13 | 21.7 / 20.2 | 4.90 / 4.25 | 3.9 | 19.5 | 12.5 | 1.28 vs 1.25 | 1.00 vs 1.00 | 9.5 | 35.5 (1.40 in) vs 1.38 in |
| 3000 | 1 | 34.05 / 33.80 | 13 | 27.4 / 25.9 | 5.70 / 5.00 | 4.55 | 22 | 14 | 1.38 vs 1.38 | 1.06 vs 1.06 | 13 | 39 (1.54 in) vs 1.50 in |
| 3000 | 1-1/4 | 42.80 / 42.55 | 13 | 35.8 / 34.3 | 6.05 / 5.30 | 4.85 | 27 | 17 | 1.57 vs 1.56 | 1.18 vs 1.19 | 13 | 39 (1.54 in) vs 1.50 in |
| 3000 | 1-1/2 | 48.90 / 48.65 | 13 | 41.7 / 40.1 | 6.35 / 5.55 | 5.1 | 32 | 21 | 1.77 vs 1.75 | 1.34 vs 1.31 | 13 | 39 (1.54 in) vs 1.50 in |
| 3000 | 2 | 61.35 / 61.10 | 16 | 53.5 / 51.7 | 6.95 / 6.05 | 5.55 | 38 | 25 | 2.13 vs 2.12 | 1.61 vs 1.62 | 19 | 51 (2.01 in) vs 2.00 in |
| 3000 | 2-1/2 | 74.20 / 73.80 | 16 | 64.2 / 61.2 | 8.75 / 7.65 | 7.0 | 41.5 | 29 | 2.26 vs 2.24 | 1.77 vs 1.74 | 19 | 51 (2.01 in) vs 2.00 in |
| 3000 | 3 | 90.15 / 89.80 | 16 | 79.5 / n/a (misprint) | 9.50 / 8.30 | 7.6 | 57.5 | 31.5 | 2.89 vs 2.87 | 1.87 vs 1.87 | 19 | 51 (2.01 in) vs 2.00 in |
| 3000 | 4 | 115.80 / 115.45 | 19 | 103.8 / 100.7 | 10.70 / 9.35 | 8.55 | 66.5 | 41.5 | 3.37 vs 3.37 | 2.38 vs 2.37 | 19 | 57 (2.24 in) vs 2.25 in |
| 6000 | 1/2 | 21.95 / 21.70 | 10 | 12.5 / 11 | 5.95 / 5.20 | 4.8 | 19.5 | 12.5 | 1.16 vs 1.13 | 0.89 vs 0.88 | 9.5 | — |
| 6000 | 3/4 | 27.30 / 27.05 | 13 | 16.3 / 14.8 | 6.95 / 6.05 | 5.55 | 22.5 | 14.5 | 1.40 vs 1.38 | 1.08 vs 1.06 | 9.5 | — |
| 6000 | 1 | 34.05 / 33.80 | 13 | 21.5 / 19.9 | 7.90 / 6.95 | 6.35 | 27 | 17 | 1.57 vs 1.56 | 1.18 vs 1.19 | 13 | — |
| 6000 | 1-1/4 | 42.80 / 42.55 | 13 | 30.2 / 28.7 | 7.90 / 6.95 | 6.35 | 32 | 21 | 1.77 vs 1.75 | 1.34 vs 1.31 | 13 | — |
| 6000 | 1-1/2 | 48.90 / 48.65 | 13 | 34.7 / 33.2 | 8.90 / 7.80 | 7.15 | 38 | 25 | 2.01 vs 2.00 | 1.50 vs 1.50 | 13 | — |
| 6000 | 2 | 61.35 / 61.10 | 16 | 43.6 / 42.1 | 10.90 / 9.50 | 8.75 | 41 | 29 | 2.24 vs 2.24 | 1.77 vs 1.74 | 19 | — |

## Where the files are

- Wermac: [ASME B16.11 socket-weld elbows 90 / 45 deg, Class 3000 and 6000 (mm)](https://wermac.org/fittings/dim_sw_elbows.html) — web — Publisher's page; dimensions are facts
- Wermac: [ASME B16.11 socket-weld tees and crosses, Class 3000 and 6000 (mm)](https://wermac.org/fittings/dim_sw_tee_cross.html) — web — Publisher's page; dimensions are facts
- Wermac: [ASME B16.11 socket-weld couplings, Class 3000 and 6000 (mm)](https://wermac.org/fittings/dim_sw_coupling.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 (14 parts, CC BY 4.0, Xem Studio)

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

- sw-elbow-90-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c3000-nps0p5.stl) — NPS 1/2 Class 3000 socket-weld 90° elbow envelope: socket bore Ø21.70, depth 10, centre-to-bottom 15.5, bore Ø15.0, body OD Ø29.90
- sw-elbow-90-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c3000-nps1.stl) — NPS 1 Class 3000 socket-weld 90° elbow envelope: socket bore Ø33.80, depth 13, centre-to-bottom 22, bore Ø25.9, body OD Ø43.80
- sw-elbow-90-c3000-nps2: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c3000-nps2.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c3000-nps2.stl) — NPS 2 Class 3000 socket-weld 90° elbow envelope: socket bore Ø61.10, depth 16, centre-to-bottom 38, bore Ø51.7, body OD Ø73.20
- sw-elbow-90-c6000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c6000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c6000-nps0p5.stl) — NPS 1/2 Class 6000 socket-weld 90° elbow envelope: socket bore Ø21.70, depth 10, centre-to-bottom 19.5, bore Ø11.0, body OD Ø32.10
- sw-elbow-90-c6000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c6000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-90-c6000-nps1.stl) — NPS 1 Class 6000 socket-weld 90° elbow envelope: socket bore Ø33.80, depth 13, centre-to-bottom 27, bore Ø19.9, body OD Ø47.70
- sw-elbow-45-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-45-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-45-c3000-nps0p5.stl) — NPS 1/2 Class 3000 socket-weld 45° elbow envelope (arms 135° apart): socket bore Ø21.70, depth 10, centre-to-bottom 11.5, bore Ø15.0
- sw-elbow-45-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-45-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-elbow-45-c3000-nps1.stl) — NPS 1 Class 3000 socket-weld 45° elbow envelope (arms 135° apart): socket bore Ø33.80, depth 13, centre-to-bottom 14, bore Ø25.9
- sw-tee-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-tee-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-tee-c3000-nps0p5.stl) — NPS 1/2 Class 3000 socket-weld tee envelope: socket bore Ø21.70, depth 10, centre-to-bottom 15.5 on run and branch, bore Ø15.0
- sw-tee-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-tee-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-tee-c3000-nps1.stl) — NPS 1 Class 3000 socket-weld tee envelope: socket bore Ø33.80, depth 13, centre-to-bottom 22 on run and branch, bore Ø25.9
- sw-tee-c3000-nps2: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-tee-c3000-nps2.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-tee-c3000-nps2.stl) — NPS 2 Class 3000 socket-weld tee envelope: socket bore Ø61.10, depth 16, centre-to-bottom 38 on run and branch, bore Ø51.7
- sw-coupling-c3000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c3000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c3000-nps0p5.stl) — NPS 1/2 Class 3000 socket-weld full coupling envelope: sockets Ø21.70 × 10 deep, 9.5 between socket bottoms, bore Ø15.0, OD Ø29.90, length 29.5
- sw-coupling-c3000-nps1: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c3000-nps1.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c3000-nps1.stl) — NPS 1 Class 3000 socket-weld full coupling envelope: sockets Ø33.80 × 13 deep, 13 between socket bottoms, bore Ø25.9, OD Ø43.80, length 39
- sw-coupling-c3000-nps2: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c3000-nps2.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c3000-nps2.stl) — NPS 2 Class 3000 socket-weld full coupling envelope: sockets Ø61.10 × 16 deep, 19 between socket bottoms, bore Ø51.7, OD Ø73.20, length 51
- sw-coupling-c6000-nps0p5: [STEP](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c6000-nps0p5.step) · [STL](https://xemstudio.com/files/hardware/forged-socket-weld-fittings-b16-11/sw-coupling-c6000-nps0p5.stl) — NPS 1/2 Class 6000 socket-weld full coupling envelope: sockets Ø21.70 × 10 deep, 9.5 between socket bottoms, bore Ø11.0, OD Ø32.10, length 29.5

## Questions

**How deep is the socket on a 1/2 inch socket-weld fitting?**

10 mm (3/8 in) for 1/2 inch; 13 mm for 3/4 to 1-1/2 inch; 16 mm for 2 to 3 inch; 19 mm for 4 inch (ASME B16.11 table, Wermac).

**What is the socket bore of a 1 inch socket-weld fitting?**

33.80 to 34.05 mm, to take 33.40 mm Schedule 40 pipe.

**What is the centre-to-bottom of a 1/2 inch Class 3000 socket-weld elbow?**

15.5 mm for the 90° and 11.5 mm for the 45° (add the 10 mm socket depth for centre-to-end).

## Fits with

- [Forged threaded fittings (ASME B16.11), Class 2000 / 3000 / 6000: elbows, tees, caps — centre-to-end, band OD, thread length](https://xemstudio.com/objects/forged-threaded-fittings-b16-11/)
- [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/)
- [Butt-weld equal tees (ASME B16.9), NPS ½ to 12](https://xemstudio.com/objects/butt-weld-equal-tees/)
- [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/)