ANBCD5OFSOversize Spiral Flute Tap UNF 5OFSSold0pcsCrafted in HSS-EX, the UNF 5OFS is a high-quality French-brand oversize tap, ideal for slightly oversized threads, made for repairing stripped/damaged threads or compensating casting shrinkage. Available in 40 sizes (thread dia 1~5, pitch 18~32, thread length 2.5mm). Suitable for machining carbon and alloy steel, stainless steel, cast iron, non-ferrous metals like aluminium and copper, workpiece hardness up to HRC45. French brand, consistent quality.
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Oversize Tap
Shrinkage Prevention
Product Overview: HSS Oversize Tap Spiral Flute UNF – 5OFS Series
【Product Features & Why We Recommend It】
- French Brand Professional Quality: Originating from a professional French cutting tool brand with rigorous quality control — recommended for users with high demands on UNF fine thread repair and oversize blind hole tapping accuracy and multi-material versatility.
- UNF Fine Thread Oversize Tap Spiral Flute Blind Hole Repair Design: Features a spiral flute oversize tap geometry that pulls chips upward and out of the hole — with a thread diameter specification larger than standard taps, recommended for UNF fine thread blind hole repair and oversize machining after thread stripping, chipping, or damage, effectively restoring North American fine thread specification workpiece threaded hole functionality, where the fine thread repair design also ensures repaired thread strength superior to UNC coarse threads.
- HSS-EX Ultra-High Performance Substrate: Manufactured with HSS-EX ultra-high performance high-speed steel, with maximum machining hardness up to HRC45 — delivering superior hardness, toughness, and wear resistance compared to standard HSS and HSS-CO, recommended for long-duration stable UNF fine thread spiral blind hole repair tapping across various materials.
- TiN Coating Enhancement: The surface is treated with TiN coating, providing good wear resistance and heat resistance — recommended for continuous UNF fine thread oversize spiral repair tapping of carbon steel, stainless steel, cast iron, and non-ferrous metals, effectively extending tool change intervals.
- 40 UNF Specification Wide Coverage: Available in thread diameter 1–5 inches and pitch 18–32 TPI across 40 specifications — recommended as the high-performance stock tool for UNF fine thread blind hole spiral oversize repair tapping in factories and maintenance centers, covering all types of thread repair needs for common North American fine thread specification workpieces.
【Machining Applications & Uses】
- Primary Use: UNF fine thread blind hole stripped thread repair and oversize tapping, North American fine thread specification damaged threaded hole functionality restoration, and precision machinery equipment UNF fine thread on-site repair.
- Recommended Work Materials:
- P-Class (Carbon Steel / Alloy Steel): Structural steel, carbon steel, and alloy steel — recommended for hardness below HRC45, where HSS-EX combined with TiN coating delivers stable UNF fine thread spiral oversize repair tapping performance.
- M-Class (Stainless Steel): SUS304, SUS316, and other high-toughness stainless steel — the spiral flute design effectively manages continuous chip upward evacuation, recommended for use with appropriate cutting fluid.
- K-Class (Cast Iron): Cast iron and gray iron — the TiN coating provides outstanding wear-resistant UNF fine thread repair tapping tool life.
- N-Class (Non-Ferrous Metals): Aluminum alloys, pure copper, brass, and other non-ferrous metals — the spiral flute design ensures smooth blind hole chip evacuation, preventing built-up edge from affecting UNF fine thread repair quality.
