Custom Sensor Thread Adapters

When the Sensor Port Isn't in the Kit

Off-the-shelf gauge-adapter kits cover the popular ports — 1/8 NPT, 1/8 BSPT, a handful of metric sizes. The moment your sensor, transducer or instrument uses something outside that set — an OEM-specific port, a fine metric pitch, a mixed combination — the kit runs out and you're stuck. The sensor is right; the adapter to mount it simply isn't sold.

EKINSUN machines that adapter. We make custom sensor thread adapters for pressure, temperature and gauge/transducer ports, in the exact thread on each end, in brass, 316 stainless or steel — single pieces through small batches, quoted in 12 hours.

For pure thread-standard conversion see thread adapters; for clean-bore lab and medical fluidics see precision machined fittings.

Sensor & Instrument Ports We Adapt

Which Sensor, Which Thread — the Pairs We're Asked For

Most enquiries arrive as a sensor type, not a thread designation — a pressure sensor thread adapter, a thermocouple thread adapter, an oxygen sensor thread adapter. That works: name the sensor and the port, and we resolve the threads.

Sensor	Threads you'll typically meet	When the adapter is machined
Pressure sensor / transducer	G1/4 and G1/2 gauge ports (ISO 228), 1/4-18 NPT, 7/16-20 UNF on SAE senders	Port and sensor disagree — a G1/4 gauge into a 1/4 NPT block, with the sealing face preserved, not guessed
Thermocouple / RTD probe	1/8 and 1/4 NPT compression fittings, M20×1.5 thermowell connections	Thread mismatch, or an immersion depth that has to land exactly where the drawing says
Oxygen / lambda sensor	M18×1.5 — the automotive standard	Bungs, spacers and extension adapters machined to your pipe or manifold
Stripped sensor port	Whatever it was before the threads left	Thread repair by bushing — machined to the housing's actual bore, restoring the original size

Adapter bodies are machined in 304 stainless (1.4301) or 316L (1.4404) for process media, brass for gauges and low-pressure lines, and 6061 or 7075 aluminium where the assembly is weight-critical — with the sealing style carried over, not improvised.

Conversions & Seals We Machine

Port / conversion	How we handle it
BSPT ↔ NPT	Common gauge/sender conversion — tapered both sides, but different angle and taper, so we cut a true converting adapter
Metric ↔ NPT / BSPP	Fine metric sensor ports (e.g. M10×1.0, M12×1.5) to NPT or BSPP
Seal feature per end	Taper for NPT/BSPT, flat or O-ring boss for BSPP/SAE, cone where required — so the sensor seats and seals
Material for the media	Brass for mild service; 316 stainless or steel for high pressure, temperature or corrosive media

Build Your Adapter Spec — Instant RFQ

Configure your sensor adapter below. It generates clean RFQ text you can copy, or send straight to our engineers — no account, no CAD file.

Materials for Sensor Adapters

No Drawing? We Reverse Engineer It

If the thread in question is the sensor's cable entry rather than its process port — a connector or gland thread such as M12×1.5 or M16×1.5 feeding a protective conduit — that is a different family of adapter, with its own sizes and sealing. See cable gland & conduit thread adapters.

What to Send Us

• The sensor and the line port, or the old adapter — or photos with one known dimension
• The thread on each end if you know it (e.g. 1/8 BSPT sensor to 1/8 NPT line)
• Medium, pressure and temperature (so we pick the right material and seal)
• Quantity — one to prove the fit, or a batch — and delivery country

Where the Sensor Adapter Kit Stops

Gauge and sender kits cover the common conversions. These are the ports that are not in any kit.

What you need	In the catalogue?	How we machine it
A conversion that is in a standard gauge adapter kit	Stocked	Buy it off the shelf — the kit will be cheaper than a machined part.
A fine metric sensor port such as M10×1.0 or M12×1.5	Thin	Fine metric sensor threads against NPT or BSPP. Both ends cut to their own pitch.
BSPT against NPT, same nominal size	Occasionally	Tapered both sides but different angle and taper, so a true converting adapter is needed rather than a nipple.
A different seal form on each end	No	Taper for NPT/BSPT, flat or O-ring boss for BSPP/SAE, cone where the sensor needs one — both cut on one part.
A thread repair adapter for a stripped sensor port	No	Oversize on the outside to whatever the damaged hole cleans up to, sensor thread on the inside.
Material chosen for the media and temperature	n/a	Brass for mild service, 316 stainless or steel for high pressure, temperature or corrosive media.
An extended reach so the tip sits in the flow	No	Body length to your immersion depth, not to a catalogue length.

Port conversions above are the ones this page already lists.

The same machining covers the parts buyers name directly: a pressure sensor thread adapter or pressure transducer adapter between the sensor’s thread and the port; a thermocouple adapter — including left-hand thermocouple adapters for rotating or legacy plant; an O2 oxygen sensor adapter on the M18×1.5 bung standard; and thread repair adapters that sleeve a damaged port back to its original size.

Frequently Asked Questions