| Specification | Details |
|---|---|
| Brand | INSIZE |
| Model | 3281-S50 |
| Product Type | Screw Thread Micrometer |
| Measuring Range | 25–50 mm |
| Graduation | 0.01 mm |
| Spindle Type | Non-Rotating Spindle |
| Force Control | Ratchet Stop |
| Measuring Tips | Included |
| Tip Angle | 60° |
| Measuring Tip Sets | 6 Pairs |
The INSIZE 3281-S50 Screw Thread Micrometer is a precision mechanical measuring instrument designed to measure the pitch diameter of screw threads in the 25–50 mm range. It features a 0.01 mm graduation, non-rotating spindle, and ratchet stop for controlled and repeatable measurement. The S50 version includes measuring tips, making it a convenient solution for professional thread inspection. The supplied 60° measuring-tip set covers multiple metric and unified thread ranges, making the micrometer suitable for CNC machining, tool rooms, manufacturing inspection, quality control, metrology, and precision engineering.
Key Features
1. 25–50mm Measuring Range
The 3281-S50 provides a 25–50 mm measuring range, making it suitable for measuring the pitch diameter of compatible larger threaded components and precision-machined parts.
2. Fine 0.01mm Graduation
The micrometer provides a 0.01 mm graduation, allowing detailed mechanical readings during thread inspection, machining, and dimensional quality-control operations.
3. Measuring Tips Included
The 3281-S50 includes six pairs of 60° measuring tips covering metric and unified thread pitches from 0.4–0.5 mm through 5.5–7 mm, providing flexibility for different compatible screw-thread applications.
4. Non-Rotating Spindle & Ratchet Stop
The non-rotating spindle helps maintain measuring-tip orientation, while the ratchet stop provides controlled measuring force for consistent readings.
5. 60° Setting Standard Compatibility
The 3281-S50 is supplied with the appropriate 60° setting-standard arrangement, while the 3281-SP1 55° setting standard is available as an optional accessory.
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