This 131-piece SAE helicoil thread repair kit restores stripped, worn, or damaged UNC threads in five sizes of 1/4 in, 5/16 in, 3/8 in, 7/16 in, and 1/2 in, stocking 110 thread inserts for engine and automotive repairs. Each fix follows four steps: drill out the damaged hole, tap the new thread, thread in the coil, and snap off the tang with the breaking pin tools, using the rubber-coated insertion tool for a steady grip. The inserts are wound from high-strength 304 stainless steel, while the twist drills of 17/64 in, 21/64 in, 25/64 in, 29/64 in, and 17/32 in and taps of 1/4-20, 5/16-18, 3/8-16, 7/16-14, and 1/2-13 are heat treated to a 55 to 62 HRC hardness for repeated repairs in aluminum, iron, carbon steel, bronze, and magnesium. The inserts, drills, taps, breaking pin tools, installation tools, and hex key stow in a portable carry case that keeps everything organized between jobs.
SAE Thread Repair 1/4 to 1/2 in: This 131-piece helicoil kit restores stripped or worn SAE UNC threads in five sizes 1/4 in 5/16 in 3/8 in 7/16 in and 1/2 in with 110 thread inserts on hand
304 Stainless Inserts and HRC55-62 Tools: The thread inserts are wound from high-strength 304 stainless steel while the twist drills and taps are heat treated to 55 to 62 HRC for repeated repairs
Four-Step Drill Tap Insert and Break: Restore a thread by drilling out the damaged hole tapping the new thread threading in the coil and snapping off the tang with the included breaking pin tools
Fixes Threads in Many Metals: The kit repairs stripped threads in aluminum iron carbon steel bronze and magnesium making it suited to engine repair automotive service and equipment maintenance
Complete Kit in Carry Case: Includes 110 thread inserts 5 twist drills 5 taps sized 1/4-20 to 1/2-13 5 breaking pin tools 5 installation tools and 1 hex key organized in a portable carry case
