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Screw Thread Insert Taps

Screw thread insert (STI) taps cut the oversized internal threads required for installing screw thread inserts such as Heli-Coil® and equivalents. Designed for thread repair and reinforcement in steel, stainless steel, aluminum, and alloys, these taps deliver precise, durable internal threads for demanding applications.

All models meet NAS 1222 specifications, making them approved for use in military vehicles and aircraft maintenance. Options include metric and USS/SAE sizes, with notched driving tangs for fast installation and removal. Compatible with standard tap wrenches and production tools, these taps support both MRO (maintenance, repair, operations) and production repair, ensuring long life, repeatable fit, and reliable performance.

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USS & SAE Perma-Thread Insert STI Taps
USS & SAE Perma-Thread Insert STI Taps
Perma-Thread Inserts feature precision-formed coils of extremely hard stainless steel (18-8) with a diamond-shaped wire design, providing permanent conventional screw-threads. Equipped with a notched driving "tang" for easy installation and removal. Designed to meet NAS 1222 specifications and suitable for military trucks, aircraft, and vehicles covered by MS 21208 and MS 21209.
Thread Size Number of Flutes Measurement Type Thread Type Material Package Qty Item #
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#8-32
4
USS
Coarse
Stainless Steel
1
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#10-24
4
USS
Coarse
Stainless Steel
1
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#10-32
4
SAE
Fine
Stainless Steel
1
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#12-24
4
USS
Coarse
Stainless Steel
1
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1/4"-20
4
USS
Coarse
Stainless Steel
1
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1/4"-28
4
SAE
Fine
Stainless Steel
1
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5/16"-18
4
USS
Coarse
Stainless Steel
1
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5/16"-24
4
SAE
Fine
Stainless Steel
1
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3/8"-16
4
USS
Coarse
Stainless Steel
1
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3/8"-24
4
SAE
Coarse
Stainless Steel
1
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7/16"-14
4
USS
Coarse
Stainless Steel
1
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7/16"-20
4
SAE
Fine
Stainless Steel
1
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Metric Perma-Thread Insert STI Taps
Metric Perma-Thread Insert STI Taps
Perma-Thread Inserts feature precision-formed coils of extremely hard stainless steel (18-8) diamond-shaped wire, providing permanent conventional screw-threads when installed. Designed with a driving "tang" for easy installation and removal. Larger in diameter before installation, they expand outward to anchor securely. Compatible with military trucks, aircraft, and vehicles per MS 21208 and MS 21209, meeting NAS 1222 specifications.
Thread Size Number of Flutes Measurement Type Thread Type Material Package Qty Item #
Price
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M5 x 0.8
4
Metric
Coarse
Stainless Steel
1
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M6 x 1.0
4
Metric
Coarse
Stainless Steel
1
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M7 x 1.0
4
Metric
Coarse
Stainless Steel
1
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M8 x 1.0
4
Metric
Fine
Stainless Steel
1
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M8 x 1.25
4
Metric
Coarse
Stainless Steel
1
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M10 x 1.25
4
Metric
Fine
Stainless Steel
1
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M10 x 1.5
4
Metric
Coarse
Stainless Steel
1
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M12 x 1.5
4
Metric
Fine
Stainless Steel
1
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M12 x 1.75
4
Metric
Coarse
Stainless Steel
1
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M14 x 1.5
4
Metric
Fine
Stainless Steel
1
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M14 x 2.0
4
Metric
Coarse
Stainless Steel
1
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M16 x 1.5
4
Metric
Fine
Stainless Steel
1
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