ROCKY MOUNTAIN TWIST Threaded Shank Drill Bit: #28, 1-1/4" Overall Lg

This cobalt drill bit is designed for drilling precision holes in hardened metals and aerospace alloys. Its threaded shank (1/4"-28) allows secure mounting in tool holders for high-torque applications. It meets NAS 965 Type D specifications, making it suitable for aircraft maintenance and industrial machining where exact hole size and shank retention are critical.

The bit has a 0.1405-inch diameter (#28 wire gauge), 1/4"-28 threaded shank, and 1-1/4" overall length. It is made from black oxide cobalt steel and conforms to NAS 965 Type D standards. The manufacturer part number is 953CO28SS. These specs ensure compatibility with standard threaded holders and repeatable drilling in tough materials.

3G Electric supplies ROCKY MOUNTAIN TWIST threaded shank drill bits worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your facility. Contact our team for pricing and lead time on the #28 bit (MPN 953CO28SS). We source genuine ROCKY MOUNTAIN TWIST tooling for aerospace and industrial buyers.

Match the thread size (1/4"-28) to your tool holder and the wire gauge (#28 = 0.1405") to your hole diameter. Confirm overall length (1-1/4") fits your clearance. For hardened materials, choose cobalt with black oxide finish. Verify NAS 965 Type D compliance if required by your quality system. 3G Electric can help cross-reference your application needs.