Precision Twist Drill 5998363 Jobber Drill Bit No 30 Hss

Product Description

The PRECISION TWIST DRILL 5998363 is a jobber-length drill bit sized to wire gauge No. 30, equivalent to 0.1285 inches in diameter. Built from high speed steel with a steam oxide coating, it features a standard 118-degree split-point tip and a regular spiral flute geometry designed for consistent chip evacuation. The straight cylindrical shank seats cleanly in standard drill chucks. Overall length is 2.75 inches, with a flute length of 1.625 inches, giving a 13xD flute-to-diameter ratio. This is a general-purpose drilling tool suited for production shops, maintenance technicians, and metalworking trades who need reliable, repeatable performance in small-diameter hole work.

The 5998363 is rated for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials. It belongs to Precision Twist Drill Series R18 and meets ANSI standards. Typical applications include through-hole drilling in sheet metal fabrication, machine shops, and maintenance environments where wire-gauge drill sizes are specified by engineering drawings or fastener clearance requirements. The web-thinned, tapered web design reduces thrust force at the tip, which is particularly useful when drilling tougher alloys or thinner stock.

Key Features

• Wire gauge No. 30 size, 0.1285 inches diameter, for precision small-hole work
• High speed steel construction for durability across a broad range of workpiece materials
• Steam oxide coating reduces friction and provides mild corrosion resistance during storage and use
• 118-degree standard point angle for general-purpose entry on flat and curved surfaces
• Web-thinned, tapered web reduces cutting thrust and extends tool life in harder materials
• Right-hand spiral flute with regular helix for efficient chip removal in through and blind holes
• ANSI-compliant jobber length: 2.75 inches OAL with 1.625 inches of usable flute

Compatibility

Designed as an OEM-style replacement or standard-stock jobber drill bit for use in any drill press, hand drill, or CNC drilling application that accepts a straight cylindrical shank and requires a No. 30 wire gauge diameter. Compatible across Series R10, R15, and R18 Precision Twist Drill product families per supplier data.

Installation Notes

Install in a standard keyed or keyless chuck, ensuring the shank is fully seated and the chuck is tightened evenly. Power down or de-energize the drilling equipment before changing bits. Use appropriate cutting fluid or coolant for stainless steel, titanium, and superalloy workpieces to manage heat buildup, as this bit is rated for coolant-through use only externally. Inspect the cutting edges and web for wear before each use; a worn 118-degree point will cause oversized holes and poor surface finish.