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Industrial Hardware & Specialties, Inc. :: Thread Repair Kits & Inserts

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Thread Repair Kits & Inserts

Why Use Threaded Helical Inserts?

Threaded inserts are used when alternate methods of repairing a threaded hole are inconvenient, impractical or impossible. The Precision system is much easier than plugging a damaged hole with weld bead, re-drilling and tapping. It’s usually more practical than using an oversized bolt.

Simple Installation

The first step in creating a new, stronger thread is cleaning up the original, damaged threads. This is done with a standard drill, the size of which is indicated on the product package. The hole is then tapped with an oversize Screw Thread Insert (STI) tap provided in each kit. Kits do not include drills. Since you may already have the necessary drill in your tool kit, drills are available separately. The free diameter of the Thread Insert is larger than the new threaded hole, but it is easily “wound” into place with the inserting tool provided. Once in place, the insert tends to spring back to its original diameter, giving it a very strong grip in the hole. Finally, the driving tang is broken off by tapping downward with the end of the inserting tool. If necessary, inserts can be removed, using one of the extracting tools shown on our site.

Automatically Corrects Thread Pitch Errors

Replacement of the entire damaged part could well be impossible as well as costly and time-consuming. While our thread insert offers an expedient solution to an immediate problem, its benefits don’t end there. Almost all threaded fasteners contain minor errors in pitch of threaded form which tend to concentrate the load on some threads. The free coils of the helical thread insert can flex to accommodate form and pitch variations, thus distributing the load most efficiently over all threads.

Free-Running and  Locking Inserts

Our thread inserts are made in all standard thread sizes and in two basic types…free-running and locking. The locking type features a crimped turn which provides an exceptionally strong grip on the mating bolt. Locking inserts can be used to eliminate the need for lock washers or other locking devices. The design is particularly recommended for applications which require a constant locking torque. The thread insert system is supplied with easy-to-use tooling which facilitates installation in almost any location. Our taps inserts and tools are interchangeable with other helical insert systems.

Single Size Repair Kits
Single Size Repair Kits
82 products
Mini Range Kits
Mini Range Kits
7 products
Master Range Kits
Master Range Kits
4 products
Master Helical  Total Range Repair Kit
Master Helical Total Range Repair Kit
5 products
Giant Big-Boy Range Kits
Giant Big-Boy Range Kits
4 products
Giant 8-Pitch Repair Kits
Giant 8-Pitch Repair Kits
20 products
Giant Metric Repair Kits
Giant Metric Repair Kits
20 products
Left Hand Repair Kits
Left Hand Repair Kits
36 products
British Thread Inserts
British Thread Inserts
56 products
Spark Plug Kits
Spark Plug Kits
5 products
N.P.T Pipe Thread
N.P.T Pipe Thread
5 products
Small Quantity Insert Packages
Small Quantity Insert Packages
157 products
Bulk Quantity Insert Packages
Bulk Quantity Insert Packages
738 products
STI Taps & Drills
STI Taps & Drills
203 products
Hand Tools
Hand Tools
49 products
Pre-Winder Tools
Pre-Winder Tools
113 products
Extracting Tools
Extracting Tools
5 products
Display Racks
Display Racks
1 products

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