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STI Tap for Wire Thread Insert
-- Steady & Reliable Manufacturer --
Product Overview
This is a special Screw Thread Insert (STI) tap, ground to cut the oversized, non-standard thread form that a wire thread coil insert needs in order to seat and lock correctly, rather than a standard nut-and-bolt thread. It is the tap used to prepare a hole before installing a helicoil-type, tangless, or screw-lock wire thread insert.
We supply this tap to buyers who are installing our wire thread inserts and need the matching STI tap to cut a correctly sized hole, whether for a one-off repair, a repair kit refill, or a production line preparing holes for insert installation.
Specifications
| Item | Detail |
|---|---|
| Design | STI (Screw Thread Insert) thread form, oversized relative to the nominal bolt thread |
| Material | HSS; HSS-E (cobalt) for stainless and harder alloys |
| Coating | TiN, TiCN, or bright (uncoated) |
| Thread Size Range | Matches standard wire thread insert sizes, M2 – M39; UNC/UNF #0 – 1-1/2" |
| Compatible Insert Types | Free-running, screw-lock, and tangless wire thread inserts |
| Standard Reference | Cuts to MIL-I-45914 / NASM8846 insert-hole dimensions |
| Shank Style | Standard shank per size, straight flute or spiral point geometry available |
| Packaging | Individual case, or boxed set matched to common insert sizes |
Application Fields
- ✓Preparing tapped holes before installing helicoil-type wire thread inserts
- ✓Tangless and screw-lock wire thread insert installation prep
- ✓Thread repair kit tap replacement
- ✓Aerospace and automotive thread reinforcement prep work
- ✓General machine shop thread repair using wire thread inserts
- ✓Tooling distributor resale alongside insert and repair kit products
Key Advantages
- Cuts the exact STI thread form that our wire thread inserts are designed to seat into, avoiding a mismatched or undersized hole.
- Matches free-running, screw-lock and tangless insert sizes, so one tap size covers all insert types for a given nominal thread.
- HSS-E (cobalt) option extends tool life when preparing holes in stainless steel or harder aerospace alloys.
- Sized to standard insert dimensions, so it works directly with our helicoil-type inserts and repair kits without custom tooling.
- Available individually or as a boxed set matched to the most common insert sizes used in repair work.
Company Profile
Dongtai Jinzhize Metal Products Co., Ltd.
As STI Tap for Wire Thread Insert Manufacturer and STI Tap for Wire Thread Insert Factory, Dongtai Jinzhize Metal Products Co., Ltd. is a specialized manufacturing facility dedicated to threaded connection products for the automotive and aerospace sectors. We primarily produce Helical Wire Inserts, Self-Tapping Inserts, Key Locking Inserts, Threaded Adapters, Oil Plugs, as well as matching installation taps and tools.
Established in 2015, the company operates from a 10,000-square-meter-owned manufacturing plant equipped with hundreds of machine tools and automated production systems. Through years of development, we have built an experienced team of design, development, and production specialists, complemented by a rigorous quality management system and comprehensive after-sales service mechanism.
Our products are widely utilized in the automotive industry (including engines and transmissions for both passenger and commercial vehicles), the aerospace industry, and rail vehicle manufacturing.
With an annual output value of 153 million RMB in 2024, we possess the capability for a large-scale, stable supply. We are committed to providing customers with highly consistent, traceable products and reliable service support.
