Thread Repair Technical Information
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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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