Heli-Coil 5528-5 Thread Repair Kit, 5/16-24 UNF, 12 Inserts

Heli-Coil 5528-5 Thread Repair Kit, 5/16-24 UNF, 12 Inserts

• Heli-Coil 5528-5 is an inch fine thread repair kit designed to restore stripped or damaged 5/16-24 UNF internal threads. The kit uses stainless steel wire thread inserts to create durable replacement threads and is commonly applied to automotive repairs such as exhaust manifold stud threads.
• Features:
  • 5/16-24 UNF thread repair capability helps restore damaged internal threads to a reusable size for standard fasteners.
  • 12 stainless steel wire thread inserts provide multiple repairs while improving resistance to wear and corrosion compared to damaged parent material.
  • Matched Heli-Coil tap (2299-5) and installation tool, tool Type 3 (R1191-5) support correct thread preparation and consistent insert installation.
  • Insert length 0.469 inches aligns with the specified kit size for common service repairs requiring an inch fine thread insert.
  • Designed application for repairing 5/16-24 UNF threads, with common use on exhaust manifold studs and other automotive threaded holes.
• Includes:
  • Heli-Coil Thread Inserts, 5/16-24 UNF x 0.469 inches, 12 count (821-5)
  • Heli-Coil Tap, 5/16-24 UNF (2299-5)
  • Heli-Coil Installation tool, tool Type 3 (R1191-5)
  • Instructions
• Specifications:
  • Manufacturer: Stanley Engineered Fastening (Heli-Coil)
  • Part Number: HE5528-5
  • MPN: 5528-5
  • UPC: 025964110213
  • Category: Fasteners
  • Subcategory: Threaded Inserts
  • Product Type: Thread Repair Kit
  • Thread Size: 5/16-24 UNF
  • Insert Length: 0.469 inches
  • Insert Material: Stainless steel (18-8)
  • Insert Quantity: 12
  • Insert Part Number: 821-5
  • Tap Part Number: 2299-5
  • Installation tool Type: 3
  • Installation tool Part Number: R1191-5
  • Drill Size Required: 21/64 inch
  • Drill Bit Included: No
  • Packaging Type: Carded
  • System Compatibility Or Application: Designed to repair stripped or damaged 5/16-24 UNF internal threads, commonly used on automotive exhaust manifold stud threads.
• The Heli-Coil Thread Repair Kit can also be referred to as a thread insert repair kit, a wire thread insert kit, a 5/16-24 UNF thread repair kit, an automotive thread repair kit, and a stainless steel thread insert kit.

Stanley Engineered Fastening manufactures fastening and assembly solutions used across automotive, industrial, and maintenance applications. The Heli-Coil brand is known for thread reinforcement products, including wire thread inserts and installation tooling for service, repair, and production environments.

Q: What thread size does this kit repair?
A: It is designed to repair internal threads to 5/16-24 UNF (inch fine) using matching inserts, tap, and installation tool.

Q: What drill size is required for installation?
A: The required drill size is 21/64 inch to prepare the hole before tapping and installing the insert.

Q: How many inserts are included in the kit?
A: The kit includes 12 thread inserts (821-5), along with the matching tap (2299-5) and installation tool (R1191-5).

Q: Is this kit intended for any specific application?
A: It is intended to restore stripped or damaged 5/16-24 UNF threads and is commonly used for automotive repairs such as exhaust manifold stud thread restoration.