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Tri-clamp × male NPT adapters (21MP style): ½ to 4 in

Name: Tri-clamp × male NPT adapters (21MP style): ½ to 4 in dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How long is a tri-clamp to male NPT adapter? · Standard part · basis: Face-to-end A per Dixon T21MP; NPT envelope (major diameter over L2) per ASME B1.20.1; bore the smaller of the clamp bore and the Sch 40 bore

Exact dimensions. True size, with no printing tolerance added.

sizes: 10 in table

Notes

Clamp face one end, male pipe thread the other. Threads are drawn as plain cylinders at the major diameter over the effective length L2; cut or chase the thread on the part, or print the envelope as a gauge.
Only sizes with a published A are drawn.
Every clamp face is the ISO 2852 profile used across this site: 2.85 mm rim, flat face with the gasket groove (K 1.6 deep, R3 1.2 bottom, 23° walls, P2 0.8 edges) on C2, 20° back cone. Flange C3 / groove C2 / tube OD × wall, mm: ½–¾ in 25.0 / 20.4 (derived) / 12.7–19.05 × 1.65; 1–1½ in 50.5 / 43.5 / 25.4–38.1 × 1.65; 2 in 64.0 / 56.5 / 50.8 × 1.65; 2½ in 77.5 / 70.5 / 63.5 × 1.65; 3 in 91.0 / 83.5 / 76.2 × 1.65; 4 in 119.0 / 110.0 / 101.6 × 2.11; 6 in 166.9 (6.570 in) / 156.5 / 152.4 × 2.77; 8 in 217.7 (8.570 in) / 207.0 / 203.2 × 2.77; 10 in 268.5 / 261.0 / 254.0 × 3.40; 12 in 319.3 / 311.8 / 304.8 × 3.40.

Sizes

clamp_in	npt	A_in	A_mm	thread_major_mm	L2_mm
½	¼	2.0	50.8	13.72	10.2
½	½	1.63	41.4	21.34	13.6
½	¾	2.0	50.8	26.67	13.9
¾	¾	1.79	45.5	26.67	13.9
1	½	2.19	55.6	21.34	13.6
1	1	2.25	57.1	33.4	17.3
2	2	2.64	67.1	60.33	19.22
2½	2½	2.88	73.2	73.03	28.89
3	3	3.07	78.0	88.9	30.48
4	4	3.16	80.3	114.3	33.02

Where the files are

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

Dixon	Clamp × male NPT (T21MP) and clamp × female NPT (T22MP) adapters: A per size	PDF	publisher's catalogue; dimensions cited
ASME	B1.20.1 Pipe threads, general purpose (NPT): major diameter, L2, tap drill; B16.11 forged fittings (Class 3000 couplings); B36.10 Sch 40 bore	standard	ASME; dimensions are facts verify
Rubber Fab	Tri-Clamp gasket dimensional chart: gasket ID, OD and bead diameter per size (2 in bead 2.22 in / 56.50 mm, 1.5 in 1.71 / 43.50, 3 in 3.29 / 83.50)	PDF	maker chart; dimensions are facts verify

Free files

★ Free files 10 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

male-npt-0.5in-x-1-4	½ in clamp × ¼ MNPT: 2.0 in face to thread end; thread envelope Ø13.72 × 10.2 (L2)	STEP · STL
male-npt-0.5in-x-1-2	½ in clamp × ½ MNPT: 1.63 in face to thread end; thread envelope Ø21.34 × 13.6 (L2)	STEP · STL
male-npt-0.5in-x-3-4	½ in clamp × ¾ MNPT: 2.0 in face to thread end; thread envelope Ø26.67 × 13.9 (L2)	STEP · STL
male-npt-0.75in-x-3-4	¾ in clamp × ¾ MNPT: 1.79 in face to thread end; thread envelope Ø26.67 × 13.9 (L2)	STEP · STL
male-npt-1in-x-1-2	1 in clamp × ½ MNPT: 2.19 in face to thread end; thread envelope Ø21.34 × 13.6 (L2)	STEP · STL
male-npt-1in-x-1	1 in clamp × 1 MNPT: 2.25 in face to thread end; thread envelope Ø33.4 × 17.3 (L2)	STEP · STL
male-npt-2in-x-2	2 in clamp × 2 MNPT: 2.64 in face to thread end; thread envelope Ø60.33 × 19.22 (L2)	STEP · STL
male-npt-2.5in-x-2-1-2	2½ in clamp × 2½ MNPT: 2.88 in face to thread end; thread envelope Ø73.03 × 28.89 (L2)	STEP · STL
male-npt-3in-x-3	3 in clamp × 3 MNPT: 3.07 in face to thread end; thread envelope Ø88.9 × 30.48 (L2)	STEP · STL
male-npt-4in-x-4	4 in clamp × 4 MNPT: 3.16 in face to thread end; thread envelope Ø114.3 × 33.02 (L2)	STEP · STL