Heli-coil K1191-24 Free Running Insert 1-1/2-12 Unf

Product Description

The HELI-COIL K1191-24 is a free running wire thread insert designed to create a strong, wear-resistant internal thread in parent materials that require thread repair or reinforcement. Sized at 1-1/2-12 UNF, the insert measures 2.25 inches overall length, providing a 1-1/2D length-to-diameter ratio. Manufactured from stainless steel with a bright, uncoated finish, it delivers corrosion resistance suitable for demanding mechanical and industrial environments. The tanged design allows installation with a standard HELI-COIL drive tool, and the tang is removed after seating to complete the installation.

Free running inserts of this size are used in applications where standard threads in aluminum, cast iron, or softer base materials need to be upgraded to a durable stainless steel thread form. Common install scenarios include heavy equipment repair, industrial machinery, marine hardware, and any structural or high-vibration assembly where a 1-1/2-12 UNF thread must hold reliably over extended service cycles. This insert is supplied individually and is compatible with matched HELI-COIL installation tooling for the 1-1/2-12 thread series.

Key Features

• Thread size: 1-1/2-12 UNF, providing a fine-pitch thread form
• Overall length of 2.25 inches with a 1-1/2D length-to-diameter ratio
• Stainless steel construction with bright, uncoated finish for corrosion resistance
• Tanged design for use with standard HELI-COIL installation driver tools
• 23-1/2 free coils for consistent thread engagement across the full insert length
• Single-insert packaging suitable for low-quantity repair or prototyping use

Compatibility

Designed for use in any tapped parent material requiring a 1-1/2-12 UNF free running wire thread insert. Requires a matching HELI-COIL tap and installation tool sized for the 1-1/2-12 thread series.

Installation Notes

Installation is typically performed by a machinist or maintenance technician using the specified HELI-COIL tap, installation tool, and tang break-off tool for the 1-1/2-12 series. The parent material must be drilled and tapped to the correct HELI-COIL insert tap size before the insert is driven in. Ensure the parent material is secured and the bore is clean and free of debris before installation. Always remove the drive tang after the insert is fully seated using the appropriate tang break-off tool.