Thread Repair Technical Information

Basics of...Thread Repair

Thread Repair Inserts are used to quickly and permanently restore tapped holes, which have been stripped or damaged due to wear, corrosion or over torque.

4 Easy Steps for Coil Type Inserts

Drill- Drill hole
Tap- Tap the hole to a sufficient depth to accommodate the insert length and bolt being used
Install- Install the appropriate length insert. Use the installation tool and wind the insert into the hole until the top coil is ¼ - ½" below the surface
Tang Removal- Remove the tang by using a break-off rod or a punch that fits inside the insert

Coil Type Inserts

Free Running

Can be used to repair tapped holes, which have been stripped or damaged due to wear, corrosion or over-torque
Coil tension holds insert in place without placing tension on surrounding material
Vibration & impact resistant

Free Running

Features a locking mechanism that grips the bolt and prevents it from loosening under vibration or impact
Eliminates the need for thread locking mechanisms
Allows repeated assembly and disassembly without appreciable loss of selflocking torque

Tanged

Tangs must be removed to eliminate interference with the end of the assembled bolt
Operation is automatic and can be operated with one hand
Tang break off tool is required

Tangless

Eliminates the need for a tang break-off tool
Installs quickly and easily from either end

Strip Feed Reels

Bulk inserts mounted on plastic strips available in reels of 500 or 1000
Increases installation rates by minimizing handling
Used with power installation tooling to support high volume production requirements

Surface Treatments for Coil Type Inserts

Primer Free II^®

Contains no chromates; RoHS compliant
Eliminates need for zinc primer
Prevents galvanic corrosion between insert and parent material
Eliminates locking torque issues associated with primers
Improves installation productivity
Provides additional lubrication facilitating insert installation

Gall Resistant

Material: Nitronic 60^™
Requires no additional coatings or plating
Non-magnetic & particle free
Ideal for use in vacuum environments

Dry Film Lubricant

Provides additional lubrication in high friction applications
Temperature resistant up to 400° F
Contains corrosion resistant properties

Thread Repair Kits

A convenient way to quickly repair tapped holes which have been stripped or damaged
Most kits (unless otherwise noted) contain: Drills, taps, installation tools, tang break-off tools and a quantity of inserts
Available in Inch, Metric, Spark Plug or Pipe Thread series

Tools

Hand Installation

Used to install inserts in tapped holes
Thread size of the insert to be installed will determine the choice of tool:

To install coarse threads use a Mandrel
To install fine threads use a Prewinder

Hand Extraction

Used to remove inserts from a tapped hole
Place tool inside hole with insert to be removed. Strike head of the tool with a light blow and turn counter clockwise, maintaining steady downward pressure

Tang Break-Off

Removes tang after installation to prevent interference with the end of an assembled bolt
Available for use with sizes up to 1/2" and M12 nominal diameter

Power

Used for high volume production
Can be hand held or mounted on a work station
Consists of an air motor, adapter and front end assembly
Available for use with sizes up to 1/2 and M12 nominal diameter
Front end assembly consists of:

Prewinder
Mandrel
Spacers

Screw Thread Insert (STI) Taps

For use in tapping holes according to screw thread standards

Materials

Carbon Steel

Standard, general purpose material

Stainless Steel

Corrosion resistant
Ideal for original equipment applications, repair and overhaul

Titanium

Superior strength to weight ratio
Corrosion resistant
Excellent low pressure stability

Nitronic 60^™

Compatible with stainless steel screws
Ideal for vacuum environments
Particle-free, non-magnetic with excellent gall resistance

Non-Coil Type Inserts

Solid

Designed to fill holes that are too large or relocated holes that have been drilled or tapped in the wrong location

Self-Locking

Repairs stripped or worn threads in jigs, fixtures, bolster plates, dies and machine tools
Features a locking element to hold insert secureley in place and will not loosen under vibration

Keylocking

Features 2 or 4 locking keys that provide superior holding power in a variety of materials
Inserts with internal threads of size M7 or larger are furnished with 4 locking keys, sizes smaller than M7 are supplied with 2 locking keys

Solid Thread Insert Styles

Thin Wall- Designed for applications where wall thickness or weight is not an issue
Heavy-Duty- Most commonly used insert, available with coarse and fine threads
Extra Heavy-Duty-Designed with increased wall thickness and greater external thread area for superior pull-out strength and holding power. In high sheer strength materials: provides comparable holding power to heavy inserts. In low sheer strength materials: provides maximum holding power and pull-out strength

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