Description
Thread measuring wire set ø6.5 mm (Set 0.17 to 3.20 mm) is a precision-ground tool steel wire used in the three-wire method to verify the pitch diameter of screw threads. The three-wire method provides more accurate pitch diameter measurement than direct reading with a thread micrometer — three wires of identical diameter (maintained as a matched set in the inspection laboratory) create a measurement geometry that cancels first-order errors.
Wire diameter ø6.5 mm. Lapped to tight tolerances, hardened, and supplied with documented diameter calibration. Use a matching thread micrometer or universal micrometer for the actual measurement step.
Usage: Select three wires with a diameter matched to the thread pitch (the manufacturer’s table provides the correct wire diameter for a specific thread pitch). Place two wires in adjacent grooves on one side of the thread and one wire on the opposite side. Measure over the wires with a standard outside micrometer. Apply the three-wire formula: pitch diameter = M − 3w + 0.866p (where M is the over-wire reading, w is the wire diameter, and p is the thread pitch).
Common applications: Thread QC inspection in machine shops performing screw machining, calibration lab thread form verification, line-side QC on thread cutting operations, and all applications where direct thread micrometer readings need to be verified against the more accurate three-wire reference.
Features
- Thread measuring wire set ø6.5 mm (Set 0.17 to 3.20 mm)
- Hardened, ground reference surfaces for repeatable measurement
- Schut build quality
- Suitable for workshop QC, calibration lab, and bench measurement applications
- SWISS MADE series
Specifications
| Manufacturer | Schut |
|---|---|
| Series | SWISS MADE |
| Type | Thread measuring wires |
| Article number | 64-779160 |
Compatible accessories
Compatible accessories: Schut setting standards and reference standards for periodic verification of accuracy at known dimensions; calibration certificate (ISO 17025) upon initial delivery and for periodic verification — typically a 12-month interval for production floors, 6 months for high-volume lines; Schut protective cases and bench storage; Schut spare parts and consumables where applicable.
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