HARLEY KIT 5/16-18 - Heli Coil Products

The Heli-Coil HARLEY KIT 5/16-18 (Model: 5521-5-2) provides a robust and reliable solution for permanently repairing stripped, worn, or damaged 5/16-18 UNC threads in professional automotive and industrial applications. This comprehensive kit restores compromised threads to their original size and condition, creating a stronger, more durable fastening point than the original. It is engineered to perform across a variety of materials, including aluminum, magnesium, cast iron, and bronze.

Key Features

• Permanent Thread Restoration: Effectively repairs 5/16-18 UNC coarse threads, ensuring a secure and lasting connection.
• Durable Construction: Inserts are crafted from hard, corrosion-resistant 18-8 (304) stainless steel, providing superior strength and resistance to vibration and impact.
• Versatile Material Compatibility: Suitable for restoring threads in a wide range of materials commonly found in engines, transmissions, and industrial equipment.
• Complete Kit Contents: Each kit includes a precision Heli-Coil tap, an installation tool, and 12 high-quality stainless steel inserts, along with detailed instructions for proper application.
• Improved Thread Integrity: Creates threads that are often stronger than the original, resisting future stripping and wear.

Applications

This Heli-Coil 5/16-18 thread repair kit is an indispensable tool for professional technicians and mechanics. It is widely used for repairing damaged threads in critical automotive components such as spark plug ports, oil drain plugs, exhaust and intake manifolds, transmission housings, and head bolt holes. While universally applicable for 5/16-18 UNC thread repair, its "HARLEY KIT" designation indicates particular suitability and popularity for restoring threads in Harley-Davidson motorcycle engines and other related components, including aluminum heads.

Specifications

• Thread Size: 5/16-18 UNC
• Insert Material: 18-8 (304) Stainless Steel
• Nominal Insert Length: 0.469 inches (1.5x diameter)
• Required Drill Size: 21/64 inch (Drill bit not included in kit)
• Kit Contents: Heli-Coil Tap, Installation Tool, 12 Inserts