OSG 10900800 M10x1.5 STI 3-Flute Spiral Flute MB BRZ HSS-E Tap
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The OSG 10900800 is a new M10x1.5 STI (Screw Thread Insert / Heli-Coil) spiral flute tap from OSG's List S109 series, designed to cut the oversize internal thread required to accept a wire thread insert (e.g., Heli-Coil) that yields a finished M10x1.5 nominal thread. The tap features 3 spiral flutes (3FX designation) for upward chip evacuation, making it well-suited for blind-hole tapping in tough, hard-to-machine materials. The MB (Medium Blind) geometry designation confirms it is optimized for blind-hole applications, while the BRZ (Bronze/TiN-type OSG proprietary oxide) surface treatment reduces friction and built-up edge in ferrous and stainless materials. The D4 tolerance class indicates a 4H STI pitch diameter tolerance suitable for precision wire-insert thread installation, and the round shank with square drive is sized for standard tap holders and machine chucks.
Product Specifications
| Brand | OSG |
| Part Number (MPN) | 10900800 |
| List Number | S109 |
| Thread Size | M10 x 1.5 |
| Thread Standard | Metric (STI / Heli-Coil oversize) |
| Application | STI (Screw Thread Insert / Heli-Coil) |
| Number of Flutes | 3 |
| Flute Type | Spiral Flute (3FX) |
| Hole Type | Blind Hole (MB - Medium Blind) |
| Tolerance Class | D4 (STI pitch diameter tolerance) |
| Surface Treatment / Coating | BRZ (OSG Bronze oxide coating) |
| Condition | New |
| Chip Direction | Upward (spiral flute, blind hole) |
| Material | HSS-E (High Speed Steel, Cobalt) |