Heli-coil A1185-14CN1750 Free Running Insert 7/8-9 Unc

Product Description

The HELI-COIL A1185-14CN1750 is a free running helical wire thread insert designed to restore or reinforce internal threads in worn, stripped, or undersized holes. Built from 304 stainless steel with a bright, uncoated finish, this tanged insert measures 1.75 inches in overall length and accepts a 7/8-9 UNC thread size. With 13-3/4 free coils and a 2D length-to-diameter ratio, it provides strong, vibration-resistant thread engagement in parent materials ranging from soft aluminum to harder alloys. Machinists, maintenance technicians, and industrial mechanics install this type of insert as a reliable OEM-spec thread repair solution.

This insert is suited for applications requiring durable thread repair or thread reinforcement in components subject to mechanical load and repeated fastener cycling. The 7/8-9 UNC thread size is common in heavy equipment, industrial machinery, and structural assemblies. The 304 stainless steel construction offers corrosion resistance for use in humid or mildly corrosive environments. The tanged design requires a standard tang break-off tool after installation to complete the process. This insert is sold individually.

Key Features

• 7/8-9 UNC thread size for use in standard unified coarse thread applications
• 1.75 inches overall insert length with a 2D length-to-diameter ratio for deep thread engagement
• 304 stainless steel construction provides corrosion resistance and long service life
• Tanged style allows controlled installation using a standard HELI-COIL installation tool
• Bright, uncoated finish - no coating interference with thread dimensional tolerance
• 13-3/4 free coils for consistent radial pressure and secure thread locking

Compatibility

Designed as an OEM-style thread repair insert for applications using 7/8-9 UNC internal threads in metal parent materials. Confirm parent material tap size requirements per HELI-COIL installation specifications before installation.

Installation Notes

Installation requires a correctly sized HELI-COIL tap to prepare the parent material hole before insert placement. Use a proper HELI-COIL installation tool sized for 7/8-9 to drive the insert to the correct depth. After seating the insert, break off the tang using a tang break-off tool before reinstalling any fastener. De-energize or lock out any associated equipment per applicable safety procedures before beginning thread repair work.