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Best Helical Threaded Inserts

Lisle 66130 Threaded Insert, (Pack of 10)
Threaded Inserts-10 Pack. Replaces stripped spark plug threads on Ford V10, 4.6 and 5.4 liter engines.
Reviews
"Product was just as described."
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PowerCoil 3532-2GK Free Running Coil Threaded Insert Kit, 304 Stainless Steel, #2-56 Thread Size, 0.129" Installed Length
Reviews
"Really like that this kit also comes with the drill bit as well to prevent having to find the correct bit each time."
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1/4" -20 Threaded Inserts (8 per Pack)
Features: Can be installed with screwdriver, threaded insert wrench or threaded insert power drive tool Rugged steel construction Can be used for wood/wood joints, or wood/non-wood joints Brad point drill recommended for drilling pilot hole To install, simply drill a pilot hole slightly narrower than threaded insert body.
Reviews
"These threaded inserts worked very well for the kitchen table I had built."
"They are handy when you need to screw a bolt into a piece of wood."
"The ones I received from Rockler are much much fatter than the ones shown in the picture."
"When you need this type of fastener, they are great."
"Overpriced but work fine."
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Best Externally Threaded Inserts

E-Z Lok Threaded Inserts For Metal; Assortment Kit; Carbon Steel; Heavy Wall; UNC Internal Threads, 10-24, 1/4-20, 5/16-18, 3/8-16, 1/2-13; 46 pieces
The E-Z LOK threaded inserts kit for metal is a 46-piece set of solid, heavy wall, carbon steel, self-locking, unified coarse thread inserts for use in metal, packaged in a case with a compartment for each of five different sizes: 10-24, 1/4-20, 5/16-18, 3/8-16, and 1/2-13. Full Thread Depth. 10. 329-3. 10-24. 3/8-16. 0.406. 5/16. 3/8-16. 15/32. 10. 329-4. 1/4-20. 7/16-14. 0.437. 23/64. 7/16-14. 1/2. 10. 329-5. 5/16-18. 1/2-13. 0.484. 27/64. 1/2-13. 9/16. 10. 329-6. 3/8-16. 9/16-12. 0.515. 31/64. 9/16-12. 19/32. 6. 329-8. 1/2-13. 3/4-10. 0.656. 21/32. 3/4-10. 3/4. Externally threaded inserts are used to repair a hole with stripped threads, or to install a new threaded hole.
Reviews
"These are truly professional coils."
"Fast and easy way to replace stripped out threads. Just drill out the threads, re-thread with new tap size and install E-Z LOK."
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Best Thread Locking Inserts

E-Z Lok Externally Threaded Insert, C12L14 Carbon Steel, Meets AISI 12L14/Metric, M10-1.25 Internal Threads, 9/16"-12 External Threads, 13.08mm Length, Made in US (Pack of 10)
E-Z LOK threaded inserts for metal provide an easy to use solution for repairing or reinforcing threaded holes in metal.
Reviews
"I started by using the EZ-Lok threaded coil repair kits prior to these externally threaded insert. The coil repair kits did not work twice and every time I repaired one and torqued it tight, the threaded coil will slip and not hold!"
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Best Heat Set Inserts

[initeq] Qty 100 #8-32 8-32 Threaded Heat Set Inserts for 3D Printing
This means that you can create products larger than the print volume your printer supports, and that failed prints often result in less waste due to only one part of a larger assembly failing. Enter your model number to make sure this fits.
Reviews
"Great quality and hold extremely well."
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Best Tapping Inserts

1/4-20 Thd., .551 Lg., Self Tapping Thread Inserts, Stainless Steel (1 Each)
For use in plastics, light metal alloys and hard wood.
Reviews
"They were easy to install and of good grade SS for boat applications."
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Best Crack Repairing Inserts

PowerCoil 3/8-24 unf Thread Repair Insert Kit
3/8-24UNF Thread Repair Kit: Contains 15 inserts (1.5deep) Tap, Drill Bit, and tool.
Reviews
"A complete and good quality kit."
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Best Press-In Inserts

Fastcom Press-In Threaded Insert Steel, Compatible With Metal, 1/4"-20 Internal Threads External Threads, 0.408" Length (Pack of 50)
Quickly install threaded holes in metal, plastic, fiberglass or any other rigid material with a minimum thickness of 3/32 inch (2.3812mm for metric sizes).
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