Osg 15140505 Cobalt Jobber Drill No 28 Wire 130 Deg

Product Description

The OSG 15140505 is a cobalt jobber-length drill bit in No. 28 wire size, equivalent to 0.1405 inch (3.57 mm) diameter. It features a 130-degree split point geometry with X-thinned web, which reduces walking at entry and lowers thrust force when drilling into steel and alloy steel. The TiN (Titanium Nitride) coating adds surface hardness and helps extend tool life in production drilling environments. Overall length is 3-3/16 inches, with a flute length of 1-3/4 inches and a straight cylindrical shank measuring 3/16 inch in diameter. This drill is part of OSG Series 1500 and is designed for high-performance applications in metalworking trades.

This bit is suited for use on ferrous materials including carbon steel and alloy steel in both job-shop and production settings. Its right-hand spiral flute and regular helix make it appropriate for general-purpose drilling in CNC machines, drill presses, and hand-held power tools where a standard jobber length is required. Typical applications include blind hole drilling, cross hole drilling, self-centering operations, and through-hole production work. The straight cylindrical shank fits standard drill chucks without adapters.

Key Features

• No. 28 wire size (0.1405 inch / 3.57 mm) with diameter tolerance of +0 to -0.018 mm
• 130-degree point angle with X-thinned, tapered web for reduced entry thrust and improved self-centering
• Cobalt construction with TiN coating for elevated heat resistance and extended tool life in steel applications
• Right-hand cut, regular spiral, 2-flute design for efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters
• Rated for blind hole, cross hole, drilling, and self-centering applications per Series 1500 spec

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for metalworking operations on steel and alloy steel workpieces, compatible with any drill press, CNC machining center, or handheld power tool accepting a 3/16 inch straight cylindrical shank.

Installation Notes

Installation of this drill bit should be performed by a qualified machinist or metalworking technician. Secure the straight shank firmly in a keyed or keyless chuck before operation and confirm runout is within acceptable limits. Coolant-through is not supported on this bit; apply cutting fluid externally when drilling steel at sustained feeds and speeds. Follow shop safety protocols and applicable OSHA machine guarding standards when operating drilling equipment.