The GripEdge ISTB40 is a T40 3/8" Drive Impact RPT Star/Torx Socket engineered for professional-grade fastener engagement on both new and damaged hardware. Built from precision S2 tool steel, this socket delivers the hardness and durability required for demanding daily use in aviation, automotive, and aerospace applications. Patented Rounding Prevention Technology (RPT) features bi-directional geometry that grips stripped or corroded Torx/Star fasteners, providing up to 400% more removal torque compared to standard sockets. Its impact-rated profile and black phosphate finish make it a reliable, long-service tool across a wide range of working environments.
Features
Patented RPT bi-directional geometry grips both new and stripped Torx/Star fasteners
Delivers up to 400% more torque on rounded or damaged Star/Torx bolts
Precision S2 tool steel construction for exceptional hardness and long service life
Black phosphate finish resists corrosion and exposure to shop chemicals
Impact profile for versatile use in varying clearance conditions
Compatible with standard ratchets, flex handles, and bit holders
Specifications
Part Number: ISTB40
Drive Size: 3/8"
Size: T40
Drive Style: Star / Torx
Variant: Impact
Material: S2 Tool Steel
Finish: Black Phosphate
Technology: RPT Rounding Prevention Technology
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