Recoil Brand products and systems consts of precision inserts, quality high speed taps, and easy-to-use installation tools which are used for repairing damaged screw threads or creating strong new threads. Recoil helically wound screw-thread inserts are generally manufactured from Type 304 (18-8) stainless steel wire cold rolled into a diamond shaped cross section. Recoil inserts can be supplied in other materials such as Inconel, Nimonic 90, Nitronic 60, Phosphor Bronze and Type 316 stainless steel.

 

Recoil inserts are available in either standard free running form or screw lock type which provides an internal locking feature. Inserts are manufactured for every thread form including UNC, UNF, BSC, BSW, BSP, BSF, BA, NPT and ISO Metric thread sizes.

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Recoil STI Tap Drill Chart:

Uninstalled, Recoil inserts are greater in diameter than the tapped hole in the parent material into which they are to be installed. During the assembly operation the diameter of the leading coil is reduced thereby permitting entry of the insert into the tapped hole. When the insert is installed at the correct depth, the coils expand and permanently retain the insert in place.

Unlike many solid insert types like the Keyserts and Keenserts, both manufactured by Alcoa, it is not necessary to use locking, swaging or keying operations to locate and retain Recoil inserts.Stress concentration problems whci typically occur in the parent material when using solid inserts are therefore eliminated.

A Recoil insert will dimensionally adjust both radially and axially, to any expansion or contraction within the parent material.

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