By product form

Thermocouple Bare Wire

Bare thermocouple wire is the solid, single-strand form of the five standard alloy pairs, supplied from φ0.025 mm up to φ5.0 mm. Each product page below carries the full specification table, alloy designation, EMF tolerance and the certification scope you get with the batch.

Available types — Bare Wire

Type K — Chromel / Alumel

−200 … +1370 °C

Solid single-strand Chromel.

Type N — Nicrosil / Nisil

−270 … +1300 °C

Solid single-strand Nicrosil.

Type J — Iron / Constantan

−40 … +750 °C

Solid single-strand Iron.

Type T — Copper / Constantan

−200 … +350 °C

Solid single-strand Copper.

Type E — Chromel / Constantan

−200 … +900 °C

Solid single-strand Chromel.

Specifying a bare wire conductor

Choose bare wire when the conductor is fixed in service. A solid single strand gives a stable, repeatable EMF at the junction, holds its calibrated tolerance along a straight run, and is the simplest thing to weld, braze or twist into a measuring point. Because there is no strand lay and no insulation to strip, it is also the form to specify when the junction itself has to be formed on site.

Confirm the alloy pair and the temperature range for your process — the five standard types covered here are K, N, J, T and E.
Pick the conductor diameter from φ0.025 mm to φ5.0 mm; ultra-fine gauges are made as solid single strand.
Set the surface finish and temper — bright, oxidized or electro-polished, in hard-drawn or annealed condition.

Bare wire supply details

Construction: Solid single strand
Diameter range: φ0.025 mm – φ5.0 mm — runs down to φ0.025 mm at the ultra-fine end, which is where bare wire is normally specified — fine-gauge junctions and fast-response sensing points.
Surface finish: Bright / Oxidized / Electro-polished
Condition: Hard (cold-drawn) / Soft (annealed) / Bright finished
Packaging: DIN 125 spool / Coil / Custom reel

Bare wire or stranded wire?

Bare and stranded wire are made from the same five alloy pairs to the same IEC 60584-1 Class 1 and ASTM E230 tolerances. The difference is the conductor construction, and that is what decides which form suits an installation.

Aspect	Bare Wire	Stranded Wire
Conductor construction	Solid single strand	7 / 19 / 37 twisted strands
Diameter range	φ0.025 mm – φ5.0 mm	φ0.1 mm – φ5.0 mm
Best suited to	Fixed sensing points and ultra-fine gauge junctions	Moving, flexing or vibrating conductors

Choose bare wire when the conductor is fixed in service.

Every conductor ships with a mill test certificate, EMF calibration certificate and furnace batch traceability. Tell us the alloy, diameter, finish, temper and coil weight and we return a priced offer.

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