AT Screw / Thread Inserts & Kits

Alfa Tools thread inserts and repair kits offer permanent solutions for restoring stripped, damaged, or worn threads in aluminum, magnesium, cast iron, and other soft metals. Whether you’re fixing stripped spark plug threads, reinforcing aluminum manifolds, or repairing damaged fastener holes, our comprehensive selection includes helical coil (wire thread) inserts, solid screw inserts, NPT pipe thread inserts, and complete repair kits with installation tools. These thread inserts create threads stronger than the original material, prevent future thread damage, and enable the use of standard fasteners in soft metals without the risk of stripping.

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Alfa Tools ST66530 1/4-20 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66530
MPN: ST66530

~~List price $26.68~~

Save $13.31

Alfa Tools ST66531 1/4-28 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66531
MPN: ST66531

~~List price $26.68~~

Save $13.31

Alfa Tools ST66532 5/16-18 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66532
MPN: ST66532

~~List price $29.52~~

Save $14.72

Alfa Tools ST66533 5/16-24 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66533
MPN: ST66533

~~List price $29.52~~

Save $14.72

Alfa Tools ST66534 3/8-16 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66534
MPN: ST66534

~~List price $43.56~~

Save $21.72

Alfa Tools ST66535 3/8-24 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66535
MPN: ST66535

~~List price $43.56~~

Save $21.72

Alfa Tools ST66536 7/16-14 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66536
MPN: ST66536

~~List price $48.61~~

Save $24.25

Alfa Tools ST66537 7/16-20 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66537
MPN: ST66537

~~List price $48.61~~

Save $24.25

Alfa Tools ST66538 1/2-13 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66538
MPN: ST66538

~~List price $68.68~~

Save $34.26

Alfa Tools ST66539 1/2-20 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66539
MPN: ST66539

~~List price $68.68~~

Save $34.26

Alfa Tools ST66542 5/8-11 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66542
MPN: ST66542

~~List price $137.47~~

Save $68.56

Alfa Tools ST66542A 5/8-18 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66542A
MPN: ST66542A

~~List price $137.47~~

Save $68.56

Alfa Tools ST66546 3/4-10 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66546
MPN: ST66546

~~List price $196.43~~

Save $97.96

Alfa Tools ST66547 3/4-16 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66547
MPN: ST66547

~~List price $196.43~~

Save $97.96

Alfa Tools ST66548 7/8-9 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66548
MPN: ST66548

~~List price $275.76~~

Save $137.53

Alfa Tools ST66548A 7/8-14 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66548A
MPN: ST66548A

~~List price $275.76~~

Save $137.53

Alfa Tools ST66549 1-8 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66549
MPN: ST66549

~~List price $449.32~~

Save $224.10

Alfa Tools ST66549A 1-12 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66549A
MPN: ST66549A

~~List price $449.32~~

Save $224.10

Alfa Tools ST66549B 1-14 HSS SCREW THREAD INSERT TAPS

SKU: AT-ST66549B
MPN: ST66549B

~~List price $449.32~~

Save $224.10

Alfa Tools ST66550 M5 X .8 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66550
MPN: ST66550

~~List price $26.52~~

Save $13.22

Alfa Tools ST66551 6 X 1.0 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66551
MPN: ST66551

~~List price $28.12~~

Save $14.02

Alfa Tools ST66552 8 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66552
MPN: ST66552

~~List price $31.03~~

Save $15.47

Alfa Tools ST66552A 8 X 1.0 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66552A
MPN: ST66552A

~~List price $31.03~~

Save $15.47

Alfa Tools ST66553 9 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66553
MPN: ST66553

~~List price $37.02~~

Save $18.45