Datasheet · Type K · Rev. 08

Type K Stranded Wire
Chromel / Alumel

Multi-strand twisted wire for flexibility and vibration resistance. 7/19/37 strand configurations available.

Type K Stranded Wire: φ0.1mm – φ5.0mm, −200°C to +1370°C, IEC 60584-1 Class 1

Ø range

φ0.1mm – φ5.0mm

Temp

−200°C to +1370°C

EMF tol.

±1.5°C (0–375°C) / ±0.4% (375–1000°C)

Testing

100%

Technical Specifications

Type K Stranded Wire — Chromel / Alumel at −200°C to +1370°C, multi-strand (7 / 19 / 37) from φ0.1mm – φ5.0mm, supplied to IEC 60584-1 Class 1.

How to specify Type K Stranded Wire

1. Confirm the alloy for your operating temperature — Chromel / Alumel, rated −200°C to +1370°C in air.
2. Pick the conductor diameter from φ0.1mm – φ5.0mm (diameter tolerance ±0.005mm (fine) / ±0.02mm (standard)) — supplied as 7, 19 or 37 strand Chromel / Alumel construction for −200°C to +1370°C.
3. Choose the temper condition for this K · Chromel / Alumel wire — Hard (cold-drawn) / Soft (annealed) / Bright finished. Soft or annealed tempers are usual where multi-strand K wire is routed around moving parts.
4. Choose the surface finish for K · Chromel / Alumel — Bright / Oxidized / Electro-polished. Finish is selected for the service environment along the flexing run.
5. Choose the packaging — DIN 125 spool / Coil / Custom reel, standard coil weights 5kg / 10kg / 20kg standard. Spooled so the K multi-strand pays out without twisting.
6. Quote Type K Stranded Wire against IEC 60584-1 Class 1 and request the MTC / EMF calibration certificate with the batch number for traceability.

Which thermocouple type fits the job

These are the K-type ranges as quoted for solid wire; the same Chromel / Alumel alloys are available in the multi-strand form described on this page. Confirm the type first, then choose the strand configuration.

Type	Alloy	Range	EMF tolerance
J	Iron / Constantan	−40 … +750 °C	±1.5°C (0–275°C) / ±0.4% (275–750°C)
K this page	Chromel / Alumel	−200 … +1370 °C	±1.5°C (0–375°C) / ±0.4% (375–1000°C)
N	Nicrosil / Nisil	−270 … +1300 °C	±1.5°C (0–375°C) / ±0.4% (375–1000°C)

See the full 5-type comparison →

Verification & quality evidence

• IEC 60584-1 Class 1 / ASTM E230 / DIN EN 60584
• 100% eddy-current + resistance + dimensional · MTC · EMF calibration certificate · Furnace batch traceability
• Third-party testimonials and site references are being collected for this product line — ask for Type K Stranded Wire reference contacts in comparable flexing or vibrating installations when you request a quote.

Frequently Asked Questions

What alloy is Type K stranded wire made from?

Chromel (NiCr 90/10) for the positive leg and Alumel (NiAl 95/5 with Mn 2/Si 1) for the negative leg.

What temperature range and diameters does Type K stranded wire cover?

−200 °C to +1370 °C, in diameters from φ0.1 mm to φ5.0 mm, in 7, 19 or 37 strand constructions.

When should stranded Type K be chosen over bare wire?

Whenever the wire moves. Vibration, flexing and thermal cycling work-harden a solid conductor until it fractures; stranded construction lasts several times longer in those conditions.

Can Type K stranded wire be used in vacuum or reducing atmospheres?

Not above 800 °C. Green-rot chromium oxidation in the Chromel leg drives a large negative EMF drift; Type N is the correct choice for vacuum and reducing service.