Westward 6EXN5 Step Drill Bit 10 Hole 1/4 to 1-3/8 In

Step Drill Bit for Progressive Hole Sizes

The Westward 6EXN5 step drill bit creates ten incrementally larger holes from 1/4 inch up to 1-3/8 inch in a single pass. Its high-speed steel body with an oxide coated finish resists wear during repetitive drilling tasks. The 3/8 inch shank with three flats locks securely in standard drill chucks. This bit suits maintenance technicians and fabricators who need multiple hole diameters without changing tools.

Behaviour Under Sustained Load

The oxide coated finish helps dissipate heat when drilling successive holes in metal sheet or plate. High-speed steel construction maintains cutting edges longer than uncoated carbon steel under continuous use. The straight flute design with three flats reduces chatter during extended drilling sessions. Maximum drilling depth is limited to 4 mm per step, so thick workpieces require multiple operations.

Practical Limits of the Shank Interface

The 3/8 inch straight shank fits most portable drill chucks but cannot transmit the torque of larger industrial taper shanks. Three flats prevent slippage yet limit compatibility with keyless chucks that rely on smooth cylindrical shanks. Overall length of 3 inches restricts reach in deep cavities or through bulky fixtures. Users needing deeper penetration or larger diameters must select a different tool.