1/4"-28 TAP --- - Heli Coil Products

The Heli Coil Products 821-4 1/4"-28 tap is engineered to precisely prepare damaged or stripped 1/4"-28 fastener holes for Heli-Coil thread repair inserts. This specialized tap cuts the correct oversized thread profile, ensuring optimal insert fit and maximum holding strength. Professional technicians can rely on this tool to accurately and durably restore fine-thread locations, extending component life without costly replacements.

Key Features

• Precision-Engineered for Heli-Coil Inserts: Designed to perfectly match 1/4"-28 UNF Heli-Coil thread repair inserts, guaranteeing proper fit, alignment, and maximum holding strength for a secure repair.
• Accurate Thread Form: Produces clean, true internal threads, crucial for reliable insert engagement, minimizing the risk of cross-threading, and ensuring a lasting repair.
• Professional-Grade Durability: Constructed to withstand the rigorous demands of repeated use in professional automotive, industrial, and maintenance environments.
• Material Versatility: Effectively prepares holes in a wide range of materials, including steel, aluminum, cast iron, and common machinery alloys.
• Compact Design: Its efficient form factor allows for enhanced control and easier access in confined spaces, streamlining in-vehicle or on-equipment thread repair.

Applications

The Heli-Coil 821-4 tap is an essential tool for repairing damaged 1/4"-28 fastener holes across various professional applications. It is commonly used for engine brackets, throttle and carburetor mounting bosses, accessory mounts, and small engine components. This tap is also suitable for light-duty suspension or chassis hardware, proving critical in automotive, aerospace, equipment repair, and general industrial maintenance for reinforcing fine-thread 1/4"-28 holes before installing a Heli-Coil insert to restore clamp load and component reliability.

Specifications

• Manufacturer: Heli Coil Products
• Model Number: 821-4
• Thread Size: 1/4"-28 UNF
• Weight: 0.1 lb
• Dimensions: 6.5 x 1.25 x 1.25 in