UNJ Unified Aerospace Full Profile Threading Inserts – 11 / 16 / 22 / 27 Series
Ideal for: Aerospace Components, High-Stress Fasteners, Aviation Maintenance.
- Product Standard: UNJ Unified Aerospace Full Profile laydown threading inserts (MIL-S-8879).
- Fatigue Resistance: Features a controlled, enlarged root radius (Rmax/Rmin) to reduce stress concentration, critical for aerospace safety.
- Size Range: Covers standard pitches from fine 32 TPI to coarse 4 TPI.
- Core Series: Includes the essential 16er threading insert (3/8″ I.C.) alongside precision 1/4″, 1/2″, and 5/8″ sizes.
- Versatile Machining: High-performance threading inserts for lathe applications, available in Right-Hand and left hand thread insert configurations.
- Material: Premium grade carbide threading inserts optimized for high-temperature alloys and stainless steel.
Contact our sales team to discover all of your pricing options.
Product Overview
Meet the rigorous demands of the aviation industry with our UNJ Unified Aerospace laydown threading inserts. Unlike standard UN threads, the UNJ profile is defined by a controlled, larger root radius on the external thread and a larger minor diameter on the internal thread. This specific geometry significantly improves the fatigue strength of the component, making it mandatory for many aerospace applications.
These carbide threading inserts are “Full Profile,” meaning they cut the thread groove, the controlled root radius, and top the crest in a single pass to ensure absolute conformity to aerospace standards.
Key Features & Benefits
- Aerospace Compliance: Engineered strictly to meet UNJ standards (e.g., MIL-S-8879 class 3A/3B), preventing failure in high-stress environments.
- Standard Compatibility: The popular 16er threading inserts series covers the most common aerospace pitches (32-8 TPI), fitting standard ISO tool holders.
- Precision Geometry: The high-precision ground cutting edge ensures the critical root radius is maintained throughout the tool’s life.
- Directional Options: We provide comprehensive solutions including left hand thread insert (EL/IL) models for specialized aerospace fasteners.
UNJ Full Profile External Threading Inserts Technical Specifications
| I.C. | Pitch (TPI) | Right-hand | Left-hand | L | X | Y |
|---|---|---|---|---|---|---|
| 3/8″ | 32 | 16ER32UNJ | 16EL32UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 28 | 16ER28UNJ | 16EL28UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 24 | 16ER24UNJ | 16EL24UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 20 | 16ER20UNJ | 16EL20UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 18 | 16ER18UNJ | 16EL18UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 16 | 16ER16UNJ | 16EL16UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 14 | 16ER14UNJ | 16EL14UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 12 | 16ER12UNJ | 16EL12UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 11 | 16ER11UNJ | 16EL11UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 10 | 16ER10UNJ | 16EL10UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 9 | 16ER9UNJ | 16EL9UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 8 | 16ER8UNJ | 16EL8UNJ | 16 | 1.2 | 1.5 |
| 1/2″ | 7 | 22ER7UNJ | 22EL7UNJ | 22 | 2 | 2.5 |
| 1/2″ | 6 | 22ER6UNJ | 22EL6UNJ | 22 | 2.2 | 2.5 |
| 1/2″ | 5 | 22ER5UNJ | 22EL5UNJ | 22 | 1.8 | 2.5 |
| 5/8″ | 4.5 | 27ER4.5UNJ | 27EL4.5UNJ | 27 | 2.2 | 3.2 |
| 5/8″ | 4 | 27ER4UNJ | 27EL4UNJ | 27 | 2.2 | 3.2 |
UNJ Full Profile Internal Threading Inserts Technical Specifications
| I.C. | Pitch (TPI) | Right-hand | Left-hand | L | X | Y |
|---|---|---|---|---|---|---|
| 1/4″ | 32 | 11IR32UNJ | 11IL32UNJ | 11 | 0.8 | 0.8 |
| 1/4″ | 28 | 11IR28UNJ | 11IL28UNJ | 11 | 0.8 | 0.8 |
| 1/4″ | 24 | 11IR24UNJ | 11IL24UNJ | 11 | 0.8 | 0.8 |
| 1/4″ | 20 | 11IR20UNJ | 11IL20UNJ | 11 | 0.8 | 0.8 |
| 1/4″ | 18 | 11IR18UNJ | 11IL18UNJ | 11 | 0.8 | 0.8 |
| 1/4″ | 16 | 11IR16UNJ | 11IL16UNJ | 11 | 0.8 | 0.8 |
| 1/4″ | 14 | 11IR14UNJ | 11IL14UNJ | 11 | 0.8 | 0.8 |
| 3/8″ | 32 | 16IR32UNJ | 16IL32UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 28 | 16IR28UNJ | 16IL28UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 24 | 16IR24UNJ | 16IL24UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 20 | 16IR20UNJ | 16IL20UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 18 | 16IR18UNJ | 16IL18UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 16 | 16IR16UNJ | 16IL16UNJ | 16 | 0.8 | 0.8 |
| 3/8″ | 14 | 16IR14UNJ | 16IL14UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 12 | 16IR12UNJ | 16IL12UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 11 | 16IR11UNJ | 16IL11UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 10 | 16IR10UNJ | 16IL10UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 9 | 16IR9UNJ | 16IL9UNJ | 16 | 1.2 | 1.5 |
| 3/8″ | 8 | 16IR8UNJ | 16IL8UNJ | 16 | 1.2 | 1.5 |
| 1/2″ | 7 | 22IR7UNJ | 22IL7UNJ | 22 | 2 | 2.5 |
| 1/2″ | 6 | 22IR6UNJ | 22IL6UNJ | 22 | 2.2 | 2.5 |
| 1/2″ | 5 | 22IR5UNJ | 22IL5UNJ | 22 | 1.8 | 2.5 |
| 5/8″ | 4.5 | 27IR4.5UNJ | 27IL4.5UNJ | 27 | 2.2 | 3.2 |
| 5/8″ | 4 | 27IR4UNJ | 27IL4UNJ | 27 | 2.2 | 3.2 |
(Note: Left-hand models are available for all corresponding pitches listed above).
Machining Guidelines
- UN vs. UNJ: Do not use standard UN threading inserts for UNJ applications. The root radius on UNJ inserts is larger; using a standard UN insert can result in stress risers and part rejection.
- Internal Threading: Be aware that UNJ internal threads require a larger pre-drilled hole (minor diameter) than standard UN threads to accommodate the external thread’s larger root radius.
- Setup: Ensure your threading inserts for lathe setup is rigid. Aerospace alloys (like Inconel or Titanium) often machined with UNJ threads can work-harden if the cut is not consistent.
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