# Tri-clamp end caps with ports: NPT, clamp nozzle, hose barb and airlock hole, 1½ to 8 in

> Is there a tri-clamp cap with a ½ inch NPT port?

- Category: Hardware › Sanitary clamp fittings
- Kind: Hardware
- Basis: Xem Studio design on the standard solid cap (16AMP thickness per size): ports are ASME B16.11 Class 3000 half couplings tapped to B1.20.1 (drawn as the tap-drill bore), 1½ in clamp nozzles, a ½ in hose barb (14MPHR barb profile) or a plain Ø12.7 hole
- Page: https://xemstudio.com/objects/tri-clamp-ported-end-caps/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-ported-end-caps · Plain text: https://xemstudio.com/objects/tri-clamp-ported-end-caps/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

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

## Notes

- Lids that take something: a thermometer or pressure gauge (¼ or ½ NPT), a ball-lock post or valve, a 1½ in clamp for a thermowell, airlock or spunding valve, a blow-off hose, or an airlock grommet.
- Ports are welded half couplings on the real part; here they are one solid with the cap.
- 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

| size | flange_od_mm | cap_mm |
|---|---|---|
| 1–1½ | 50.5 | 6.35 |
| 2 | 64.0 | 6.35 |
| 2½ | 77.5 | 6.35 |
| 3 | 91.0 | 6.35 |
| 4 | 119.0 | 7.92 |
| 6 | 166.9 | 11.1 |
| 8 | 217.7 | 12.19 |

## Where the files are

- 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](https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch) — standard — ASME; dimensions are facts (verify at link)
- GW Kent: [Tri-clamp fittings guide: tube OD, flange OD and ID per size to 12 in; solid cap thickness](https://www.gwkent.com/triclamp-guide) — web — publisher's guide; dimensions cited
- Dixon: [14MPHR brewery hose barb: A and barb OD B (hose ID + 0.040 in) per size, ½ to 6 in](https://www.cooneybrothers.com/userfiles/ad/documents/Dixon_Sanitary_14MPHRG600_Catalog.pdf) — PDF — publisher's catalogue; dimensions cited
- 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)](https://shop.andersonprocess.com/media/assets/product/documents/rubber-fab-tri-clamp-dimensions.pdf) — PDF — maker chart; dimensions are facts (verify at link)

## Free STEP/STL (42 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/index.json

- cap-1.5in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-8npt.stl) — 1–1½ in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-1.5in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-1-4npt.stl) — 1–1½ in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-1.5in-grommet-hole-12.7: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-grommet-hole-12.7.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-grommet-hole-12.7.stl) — 1–1½ in cap with a Ø12.7 (½ in) hole for an airlock grommet
- cap-1.5in-half-in-barb: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-half-in-barb.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-1.5in-half-in-barb.stl) — 1–1½ in cap with a ½ in hose barb (blow-off)
- cap-2in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-1-8npt.stl) — 2 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-2in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-1-4npt.stl) — 2 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-2in-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-1-2npt.stl) — 2 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
- cap-2in-3-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-3-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-3-4npt.stl) — 2 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
- cap-2in-3x1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-3x1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-3x1-4npt.stl) — 2 in cap with three ¼ FNPT half couplings on r 10.7
- cap-2in-grommet-hole-12.7: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-grommet-hole-12.7.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-grommet-hole-12.7.stl) — 2 in cap with a Ø12.7 (½ in) hole for an airlock grommet
- cap-2in-half-in-barb: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-half-in-barb.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2in-half-in-barb.stl) — 2 in cap with a ½ in hose barb (blow-off)
- cap-2.5in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-1-8npt.stl) — 2½ in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-2.5in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-1-4npt.stl) — 2½ in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-2.5in-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-1-2npt.stl) — 2½ in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
- cap-2.5in-3-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-3-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-2.5in-3-4npt.stl) — 2½ in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
- cap-3in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-8npt.stl) — 3 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-3in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-4npt.stl) — 3 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-3in-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1-2npt.stl) — 3 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
- cap-3in-3-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-3-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-3-4npt.stl) — 3 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
- cap-3in-3x1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-3x1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-3x1-4npt.stl) — 3 in cap with three ¼ FNPT half couplings on r 16.4
- cap-3in-1.5in-port: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1.5in-port.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-3in-1.5in-port.stl) — 3 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
- cap-4in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-8npt.stl) — 4 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-4in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-4npt.stl) — 4 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-4in-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1-2npt.stl) — 4 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
- cap-4in-3-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3-4npt.stl) — 4 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
- cap-4in-3x1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3x1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-3x1-4npt.stl) — 4 in cap with three ¼ FNPT half couplings on r 21.9
- cap-4in-1.5in-port: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port.stl) — 4 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
- cap-4in-1.5in-port-and-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port-and-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-4in-1.5in-port-and-1-2npt.stl) — 4 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling
- cap-6in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-8npt.stl) — 6 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-6in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-4npt.stl) — 6 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-6in-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1-2npt.stl) — 6 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
- cap-6in-3-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3-4npt.stl) — 6 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
- cap-6in-3x1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3x1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-3x1-4npt.stl) — 6 in cap with three ¼ FNPT half couplings on r 33.0
- cap-6in-1.5in-port: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port.stl) — 6 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
- cap-6in-1.5in-port-and-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port-and-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-6in-1.5in-port-and-1-2npt.stl) — 6 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling
- cap-8in-1-8npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-8npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-8npt.stl) — 8 in cap with a ⅛ FNPT half coupling at the centre (tap-drill Ø8.6)
- cap-8in-1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-4npt.stl) — 8 in cap with a ¼ FNPT half coupling at the centre (tap-drill Ø11.1)
- cap-8in-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1-2npt.stl) — 8 in cap with a ½ FNPT half coupling at the centre (tap-drill Ø18.3)
- cap-8in-3-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3-4npt.stl) — 8 in cap with a ¾ FNPT half coupling at the centre (tap-drill Ø23.4)
- cap-8in-3x1-4npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3x1-4npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-3x1-4npt.stl) — 8 in cap with three ¼ FNPT half couplings on r 44.5
- cap-8in-1.5in-port: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port.stl) — 8 in cap with a 1½ in clamp nozzle at the centre, 1 in tall
- cap-8in-1.5in-port-and-1-2npt: [STEP](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port-and-1-2npt.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-ported-end-caps/cap-8in-1.5in-port-and-1-2npt.stl) — 8 in cap with a 1½ in clamp nozzle and a ½ FNPT half coupling

## Questions

**Which cap for an airlock?**

The 1½ in or 2 in cap with the Ø12.7 hole takes a ½ in airlock grommet; or use a 1½ in clamp port and an airlock cap on it.

**Which cap for a thermometer?**

A ½ NPT port takes a ½ NPT bimetal thermometer or a thermowell; or use a tri-clamp thermowell on a clamp port.

## Fits with

- [Tri-clamp dome lids: 1½ to 12 in, plain or with a port at the crown](https://xemstudio.com/objects/tri-clamp-dome-lids/)
- [Tri-clamp thermowells: 1½ and 2 in clamp, 2½ to 12 in insertion, ½ NPT top](https://xemstudio.com/objects/tri-clamp-thermowells/)
- [Tri-clamp × hose barb adapters (14MPHR style): ½ to 4 in clamp, ¼ to 4 in hose](https://xemstudio.com/objects/tri-clamp-hose-barb-adapters/)
- [Tri-clamp × female NPT adapters (22MP style): ½ to 4 in](https://xemstudio.com/objects/tri-clamp-female-npt-adapters/)
- [Tri-clamp vessels with a dished or round welded bottom: 4, 6 and 8 in, 12 to 24 in deep](https://xemstudio.com/objects/tri-clamp-dished-bottom-vessels/)