Heavy Duty Solid Key Locking Insert For 5/16-18 External Threads. Built From Tough C1215 Steel With 302 Stainless Keys, This Zinc Phosphate Coated Design Delivers A Smooth Install And Rock Solid Grip For Bulletproof Thread Repairs Across Aluminum Or

Heavy duty thread repair insert for 5/16 18 external threads
✔️ Single pack, C1215 steel body with 302 stainless keys

This solid key locking insert is designed to fix stripped or damaged threads in tough metals like aluminum, magnesium, and cold rolled steel. You install it using basic drill and tap tools, making it a simple fix for automotive parts, aerospace equipment, and heavy machinery maintenance jobs.

✅ 5/16-18 external threading with 2A class fit
✅ C1215 steel build paired with corrosion resistant 302 stainless keys
✅ Zinc phosphate finish plus Ferrocote light oil for smooth operation
✅ 0.31 inch body length and 0.32 inch counter sink diameter
✅ Standard removal drill size of 7/32 inch with 1/8 inch clearance depth

💡 How do keyed thread bushings improve durability in soft metals?

Engineers rely on hardened steel bodies with matched stainless pins because they lock the nut in place during high vibration runs. These units are pretty handy when you need reliable torque retention without re-machining the host block.

- Provide uniform load distribution across damaged alloy surfaces - Prevent rotational slip under heavy impact and thermal cycling - Extend service life compared to conventional coil styles

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