BSP taper pipe threads R and Rp (ISO 7-1), 1/16 to 6: TPI, pitch, gauge-plane diameter, gauge length + 8 male taper STEP/STL files

sizes

15 in table

Notes

• R is the external taper pipe thread (taper 1:16 on diameter), Rp the internal PARALLEL thread and Rc the internal taper thread (ISO 7-1 designations). The diameters above are at the gauge plane; the thread gets 1 mm smaller in diameter for every 16 mm toward the end. The gauge length a is the distance from the gauge plane to the small end of the external thread.
• Numbers: ISO 7-1 sample Table 1 (iTeh) for the pitch, d, d2 and d1 of all 15 sizes (the generator re-checks P = 25.4 / TPI, d2 = d - 0.640327 P and d1 = d - 1.280654 P on every row); gauge length a from Engineering ToolBox's ISO 7-1 table and the Wikipedia British Standard Pipe table, which agree on 1/8, 1/2 and 1. R 4 and R 5 gauge lengths (25.4, 28.6) come from Engineering ToolBox only and R 6 (28.6) from Wikipedia only: the iTeh scan's gauge-length column was not legible, so there is no second source for those three. The tolerance on gauge length, the useful thread length and the fitting allowance were not readable in the sample and are left out.
• Files: 8 male taper envelopes for R 1-1/4 to R 6. Each is a cone from the free end to the gauge plane (major Ø d at the gauge plane, Ø d - a/16 at the free end) joined to an EXAMPLE EN 10255 medium tube stub (30 mm long, our example length, OD and wall below). The stub OD is larger than d on every size, as in a real threaded tube. Sizes up to R 1 (and BSP 1/8 to 1 as plain male ends) are on the 'Pipe thread envelopes' page.
• EN 10255 medium tube used for the stub (OD x wall, mm): 1-1/4 = 42.4 x 3.25, 1-1/2 = 48.3 x 3.25, 2 = 60.3 x 3.65, 2-1/2 = 76.1 x 3.65, 3 = 88.9 x 4.05, 4 = 114.3 x 4.5, 5 = 139.7 x 4.85, 6 = 165.1 x 4.85. BS 1387 tables (Engineering ToolBox) give a slightly different OD for the same nominal bores (medium / heavy OD 42.9, 48.8, 60.8, 76.6, 89.5, 114.9, 140.6, 165.1) and walls (3.2, 3.2, 3.6, 3.6, 4.0, 4.5, 5.0, 5.0): the two standards differ, so the stub is an example, not a fixed size.
• Left out: Rc internal taper details, the Rp internal tolerances, NPT (ASME B1.20.1 has its own page), JIS PT, and BSPT in tapped-hole drill sizes.

BSP taper pipe threads R and Rp (ISO 7-1), 1/16 to 6: TPI, pitch… size chart

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 8 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=bsp-taper-pipe-threads-r-rp-iso-7-1

Fits with

Free

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NPT male thread envelopes 1/8 to 1 in (ASME B1.20.1)6 sizes★ 6 filesFree

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/STL15 sizes★ 9 filesFree

ISO 1179 / BSPP (G thread) ports with O-ring or bonded seal: D3, D4, O-ring size, Dowty bonded-seal ID, OD, thickness38.1×38.1×2.47 mm★ 7 filesFree

NPT pipe plugs: square head, hex head, round head and hex socket (ASME B16.11; Dryseal NPTF, flush PTF) 1/16 to 6 in — head size, length, socket + envelope models7.9×7.9×8.2 mm★ 18 files