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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.

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

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

SKU: AT-ST66550
MPN: ST66550

Save $13.22
Alfa Tools ST66551 6 X 1.0 MM HSS METRIC SCREW THREAD INSERT TAP

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

SKU: AT-ST66551
MPN: ST66551

Save $14.02
Alfa Tools ST66552 8 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

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

SKU: AT-ST66552
MPN: ST66552

Save $15.47
Alfa Tools ST66552A 8 X 1.0 MM HSS METRIC SCREW THREAD INSERT TAP

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

SKU: AT-ST66552A
MPN: ST66552A

Save $15.47
Alfa Tools ST66553 9 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

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

SKU: AT-ST66553
MPN: ST66553

Save $18.45
Alfa Tools ST66554 10 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66554 10 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66554
MPN: ST66554

Save $29.07
Alfa Tools ST66554A 10 X 1.0 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66554A 10 X 1.0 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66554A
MPN: ST66554A

Save $29.07
Alfa Tools ST66555 10 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66555 10 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66555
MPN: ST66555

Save $29.07
Alfa Tools ST66556 11 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66556 11 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66556
MPN: ST66556

Save $31.11
Alfa Tools ST66557 11 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66557 11 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66557
MPN: ST66557

Save $31.11
Alfa Tools ST66558 12 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66558 12 X 1.25MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66558
MPN: ST66558

Save $33.68
Alfa Tools ST66559 12 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66559 12 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66559
MPN: ST66559

Save $33.68
Alfa Tools ST66560 12 X 1.75MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66560 12 X 1.75MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66560
MPN: ST66560

Save $33.68
Alfa Tools ST66561 14 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66561 14 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66561
MPN: ST66561

Save $50.54
Alfa Tools ST66561A 14 X 1.25 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66561A 14 X 1.25 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66561A
MPN: ST66561A

Save $50.51
Alfa Tools ST66562 14 X 2.0MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66562 14 X 2.0MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66562
MPN: ST66562

Save $50.54
Alfa Tools ST66563 16 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66563 16 X 1.50MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66563
MPN: ST66563

Save $61.96
Alfa Tools ST66564 16 X 2.0MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66564 16 X 2.0MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66564
MPN: ST66564

Save $61.96
Alfa Tools ST66565 18 X 1.50 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66565 18 X 1.50 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66565
MPN: ST66565

Save $83.24
Alfa Tools ST66566 18 X 2.50 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66566 18 X 2.50 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66566
MPN: ST66566

Save $83.24
Alfa Tools ST66566A 18 X 2.0 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66566A 18 X 2.0 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66566A
MPN: ST66566A

Save $83.28
Alfa Tools ST66567 20 X 1.50 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66567 20 X 1.50 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66567
MPN: ST66567

Save $113.11
Alfa Tools ST66568 20 X 2.50 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66568 20 X 2.50 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66568
MPN: ST66568

Save $113.11
Alfa Tools ST66568A 20 X 2.0 MM HSS METRIC SCREW THREAD INSERT TAP

Alfa Tools ST66568A 20 X 2.0 MM HSS METRIC SCREW THREAD INSERT TAP

SKU: AT-ST66568A
MPN: ST66568A

Save $113.11