ISO
ISO 2061 Textiles — Determination of twist in yarns — Direct counting method
How many turns per unit length are in a yarn, counted directly by untwisting it.
- Number
- ISO 2061
- Committee
- ISO/TC 38
- Status
- active
Equivalents
| Body | Number | Equivalence | Deviation |
|---|---|---|---|
| ASTM | ASTM D1422 | NEQ | Parallel standard, not an adoption of the ISO text under ISO/IEC Guide 21. Measures the same property by a comparable method; results should not be assumed interchangeable. Confirm which standard the buyer specifies. ASTM D1422 uses the untwist-retwist principle rather than direct counting, which is a different measurement route to the same property. |
| CEN | EN ISO 2061 | IDT | CEN adopts the standard unchanged under this designation, which is the name it is cited by across the European Union. Recorded so that a specification written in European terms reaches the document this register already holds. |
Verification coverage
Checked against ASTM. Not yet checked: AATCC, BIS, SAC, JIS, EN, DIN — an absent row here does not mean no equivalent exists.
What this standard is for
Where it is used
Yarn specifications where handle, strength or fabric appearance depend on twist, and in disputes about why a fabric feels wrong.
Why it matters
Twist governs strength, softness and how a knitted fabric behaves — under-twisted yarn is weak, over-twisted yarn gives spirality and a harsh handle. It is one of the few yarn parameters a buyer can feel in the finished garment.
What to watch for
Direct counting and untwist-retwist do not always give the same figure on the same yarn, so state which method the specification means.
Calculators that implement this
- Ring Frame Production Estimator
- Rotor Spinning Twist, Peripheral Speed & Production Window
- Roving Twist Multiplier, Flyer Speed & Production
- Siro Spinning Strand Spacing, Convergence Angle & Twist Balance
- Twist Multiplier to TPI & TPM Calculator
- Yarn Twist Liveliness, Snarling & Residual Torque
Buy the official copy from ISO
Metadata only — purchase the standard from the issuing body.
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