Need a tri-clamp ferrule on one end and a thread that isn't in any sanitary catalog on the other — a metric port, a BSPT valve, an odd flange bolt pattern? We machine the adapter to order: ferrule to DIN 32676 / ASME BPE dimensions so your clamp and gasket fit, the other end cut to whatever the equipment carries. 304 or 316L stainless, polished contact faces, MOQ 1, no CAD. Get a quote →
Why machine a tri-clamp adapter instead of buying one
Off-the-shelf tri-clamp adapters cover the well-trodden pairs: clamp × male NPT, clamp × female NPT, clamp × hose barb, in a handful of sizes. Step outside that — a ferrule onto an M20×1.5 instrument port, a BSPT-threaded tank fitting, a 3/8" compression line, or a bolt-flange interface on older process equipment — and the catalogs go quiet. Breweries retrofitting imported kit, food plants marrying new skids to legacy lines, and lab or extraction equipment builders hit this constantly. Each of these is a single turned part for us: ferrule end to standard, custom end to reality.
Configurations we machine
CLAMP × NPT / ZG
Male or female taper thread behind the ferrule — the classic process-to-plumbing conversion, in your size, not just the stocked ones.
CLAMP × BSP / G / METRIC
Parallel threads with shoulder seal — G3/4 CIP connections, M20×1.5 sensor ports, European tank fittings.
CLAMP × HOSE BARB
Barb profile matched to your actual hose ID — including odd and metric hoses catalog barbs skip.
CLAMP × FLANGE
Bolt-hole flange to ferrule adapters for legacy equipment — pattern copied from your part or drawing.
REDUCING CLAMP × CLAMP
Two ferrule sizes in one turned body where a gasket-and-reducer stack would add joints.
CAPS, SPUDS & PORTED BODIES
End caps with welded-in or machined ports, thermowell spuds, sample-valve bosses — one-off process oddities.
Ferrule sizes — measure the flange, not the tube
The single most common RFQ error is quoting the tube size when the clamp size is what matters. Measure the ferrule flange OD with a caliper and read it off this table:
| Nominal clamp size | Ferrule flange OD | Note |
|---|---|---|
| 1/2" – 3/4" (mini) | 25.0 mm | Shared mini ferrule |
| 1" (mini) | 34.0 mm | — |
| 1" – 1.5" | 50.5 mm | Shared — the classic mix-up size |
| 2" | 64.0 mm | — |
| 2.5" | 77.5 mm | — |
| 3" | 91.0 mm | — |
| 4" | 119.0 mm | — |
Ferrule ends are machined to DIN 32676 / ASME BPE groove and face dimensions, so standard clamps and gaskets (silicone, EPDM, PTFE, Viton) seat exactly as they do on catalog fittings. DIN-series and ISO-series ferrule dimensions differ from the inch series — if your plant runs DIN 11851 or ISO 2852 hardware instead, say so and we cut to that standard.
Materials & surface finish
| Material | Use it for | Notes |
|---|---|---|
| 316L stainless | Wetted / product-contact service | ASME BPE default for food, beverage, pharma |
| 304 stainless steel | Utilities, CIP loops, brewery duty | Economical for non-corrosive media |
| 6061 / 7075 aluminum | Non-wetted, dry-air & test rigs | Light fixtures, mock-ups, vacuum jigs — 7075 where stiffness matters |
| Brass C360 | Non-sanitary utility adapters | Free-machining, economical for prototypes |
| PTFE / PEEK | Insulating or chemical-duty bodies | Machined on request |
- Contact-face finish: machined and polished to Ra 0.8 µm (32 µin) standard; finer electro-polish-ready finish on request.
- Crevice control: bore transitions blended, no blind threads in the product path, gasket face square to the bore.
- Marking: laser-etched size, alloy and your part number — off the product-contact surfaces.
Not sure it's even "tri-clamp"? Send a photo of the joint with a ruler across the flange. We identify DIN, ISO and inch-series sanitary hardware — and the thread on the other side — as part of the free drawing. Or mail us the old fitting and we reverse engineer it.
Related pages
Where the Tri-Clamp Catalogue Stops
Standard ferrule-to-ferrule and ferrule-to-NPT parts are stocked by every sanitary supplier. These are the ones that are not.
| What you need | In the catalogue? | How we machine it |
|---|---|---|
| A standard ferrule to NPT or BSP adapter | Stocked | Buy it off the shelf from a sanitary supplier. |
| Tri-clamp on one end, an odd thread on the other | No | Ferrule flange turned to size, whatever standard goes on the second end. |
| A 1″ and 1.5″ ferrule that share a 50.5 mm flange | n/a | The classic mix-up size. Measure the flange OD, not the nominal — we quote from the flange. |
| 316L specifically for product contact | Partly | ASME BPE default for food, beverage and pharma. Stock lists often do not separate 316 from 316L. |
| A specified internal surface finish | No | Cut and finished to the Ra you state rather than as-machined. |
| Aluminium for a non-wetted test rig or jig | No | 6061 or 7075 for mock-ups and vacuum jigs where stainless is unnecessary weight. |
| A hose barb or fitting on the non-sanitary end | Thin | Barb sized to your hose ID with a proper retention profile. |
Ferrule sizes and materials above are the ones already tabulated on this page.
See also garden hose thread adapters for the 3/4-11.5 NH dimensions behind the ferrule × garden hose question below.
Will it clamp? Ferrule checks before you order
A tri-clamp joint fits by flange diameter, not by pipe size. 1″ and 1.5″ ferrules share the same 50.5 mm flange and the same clamp — only the gasket bore differs — while a 1″ mini ferrule is 34.0 mm and takes a different clamp altogether. DIN 32676 and ISO 2852 agree up to 2″ (64.0 mm) and part company at DN65: the DIN flange is 91.0 mm, the 2.5″ ISO flange is 77.5 mm, and neither clamp fits the other. Measure the flange outside diameter with a caliper and read the size from the table above.
What do I need to connect a 1.5″ tri-clamp port to a ½″ NPT gauge?
An adapter with a 50.5 mm ferrule on one end and a ½″ NPT female thread on the other, in 316L with the wetted face at Ra 0.8 µm or better, plus the clamp and gasket you already have for that ferrule size.
Same adapter, but BSP, a hose barb, or electropolished
A G ½ instead of NPT, a hose barb or a metric thread on the dry end, a mini ferrule, or 316L electropolished for a pharmaceutical line — each is a variant of the same drawing, one piece and up, quoted in 12 hours.
Frequently asked
What tri-clamp size do I have?
Measure the ferrule flange OD: 25 mm = 1/2"–3/4" mini · 34 mm = 1" mini · 50.5 mm = 1"–1.5" · 64 mm = 2" · 77.5 mm = 2.5" · 91 mm = 3" · 119 mm = 4". The 50.5 mm ferrule serves both 1" and 1.5" clamps — a caliper reading beats a nominal size every time.
Can you machine a tri-clamp to a metric or odd thread?
Yes — that's the reason to machine instead of buy. Ferrule × M20×1.5, × BSPT, × left-hand, × garden hose: the ferrule end stays to DIN 32676 / ASME BPE so your clamp and gasket fit, the other end matches your equipment.
304 or 316L?
316L for wetted product-contact duty (the ASME BPE assumption); 304 for utilities, CIP and brewing at lower cost; 6061 aluminum where the part never touches product. Tell us the media — the right alloy goes on the drawing.
Do you polish the contact surfaces?
Gasket face and bore polished to Ra 0.8 µm standard, finer on request, crevice-free transitions. CNC turned in one setup for concentricity.
Send the two ends and the media. "2" tri-clamp to 3/4 BSPT male, 316L, hot CIP loop" — that's a complete RFQ. Free drawing first, quote in 12 hours. Get a quote →