Heli-Coil® Materials, Coatings & Platings
Heli-Coil® screw thread inserts are available in a wide choice of materials to suit specific application needs.
Materials
- 304 Stainless Steel
- Standard, general-purpose material
- Ideal for original equipment applications, repair, and overhaul
- Stocked in most sizes
- Inconel X750
- Used in areas exposed to high temperatures
- Typical uses: gas turbine engines, nuclear applications, well drilling
- Non-magnetic
- Phosphor Bronze
- Ideal for salt water applications
- Non-magnetic
- Excellent electrical conductivity
- Nitronic 60®
- Superb gall resistance
- Compatible with stainless steel screws
- Ideal for use in vacuum environments
- Requires no additional coatings or plating
- Particle-free
- Non-magnetic
- Titanium
- Superior strength-to-weight ratio
- Corrosion-resistant
- Excellent low-temperature stability
Coatings & Platings
- Dry Film Lubricant
- Provides additional lubrication in high-friction applications
- High temperature resistance (400°F)
- Highly recommended with Heli-Coil® screw-locking inserts
- Mildly corrosive
- Material Spec: AS5272
- Color: Gray
- Primer Free® II
- RoHS-compliant; contains no chromates
- Eliminates need for zinc primers and epoxies
- Provides uniform top-to-bottom coverage
- Prevents galvanic corrosion between insert and parent material
- Eliminates locking torque issues associated with primers
- Improves installation productivity
- Provides additional lubrication facilitating insert installation
- Material Spec: None
- Color: Matte Black
- Cadmium
- For military specification purposes only
- Not recommended for new design due to its toxic nature
- Cadmium Plating Material Spec: QQ-P-416 Type II
- Color: Iridescent Yellow (free-running)
- Color: Olive Drab (screw-locking)
- Silver Plating
- Recommended to reduce galling of threads at high temperatures
- For use up to 1200°F
- Highly recommended with inserts made from Inconel X750
- Material Spec: QQ-S-365
- Color: Silver White
- Color Coding
- Facilitates verification of insert installation
- Allows for quick identification of similar-size inserts
- Available in Blue, Green, Red, and Black