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Screw-Lock Wire Thread Insert
-- Steady & Reliable Manufacturer --
Product Overview
The screw-lock wire thread insert is the self-locking version of our standard coil insert: a short section of the coil is deliberately deformed into an elliptical shape so it grips the mating bolt thread once installed, adding resistance to vibration-induced loosening without a separate thread-locking adhesive. It is produced to NASM8846 Type II / MIL-I-45914 tolerances and installs with the same tooling used for our free-running coil inserts.
We supply it to buyers building assemblies that see continuous vibration or shock loading, such as engine accessories, suspension components and machine tool assemblies, where a loose fastener is not an acceptable outcome and a bonded thread locker is not practical to apply or inspect on every joint.
Specifications
| Item | Detail |
|---|---|
| Material | 300 series stainless steel (S30200 / S30500) |
| Standard | NASM8846 Type II, MIL-I-45914, IFI-536 |
| Thread Size Range | Metric M2 – M24; Unified #2-56 – 1"-14 |
| Locking Method | Deformed coil section (mechanical interference); no adhesive required |
| Length Options | 1.5D, 2D, 2.5D, 3D |
| Breakaway Torque | Meets NASM8846 minimum prevailing-torque values by size |
| Surface Finish | Passivated, silver plate, or phosphate & oil |
| Reusability | Rated for a defined number of reinsertion cycles per NASM8846 size chart |
Application Fields
- ✓Engine accessory brackets and covers
- ✓Suspension and chassis fasteners
- ✓Machine tool and spindle housings
- ✓HVAC and compressor assemblies
- ✓Off-road and agricultural equipment
- ✓Wind turbine and rotating machinery housings
Key Advantages
- Removes the need for a separate thread-locking compound, which keeps assembly and later rework simpler.
- Mechanical locking action stays effective across temperature swings that can weaken adhesive-based thread lockers over time.
- Uses the same installation tooling as our free-running coil inserts, so no new equipment is needed on the line.
- Meets NASM8846 prevailing-torque requirements, giving a verifiable, testable locking performance for quality sign-off.
- Reworkable joint design, since the locking section can be replaced if the insert is removed for service.
Company Profile
Dongtai Jinzhize Metal Products Co., Ltd.
As Screw-Lock Wire Thread Insert Manufacturer and Screw-Lock 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.
