Triumph Twist Drill 090547 Drill Bit Set 13pc Hss

Product Description

The TRIUMPH TWIST DRILL 090547 is a 13-piece maintenance length drill bit set built for metalworking and general-purpose drilling in trade and industrial settings. Each bit is manufactured from high-speed steel (HSS) with a black oxide and bronze oxide finish that reduces friction and extends service life. The 135-degree split point tip allows clean, self-centering starts without a center punch. Bits range from 1/16 inch to 1/4 inch in 1/64-inch step increments, covering the most common hole sizes encountered on the job. The set ships in a metal storage case and is sized for maintenance-duty use, meaning shorter overall length for improved rigidity in tight access areas. Overall bit length is 4.125 inches.

This set is suited for metalworking, mechanical maintenance, HVAC service, plumbing, and electrical trade applications where a compact, reliable drill bit assortment is needed. The maintenance length geometry keeps bits shorter than jobber-length equivalents, providing better control and reduced deflection when drilling in confined spaces such as equipment cabinets, panels, or mechanical rooms. The round-with-three-flats straight shank seats securely in standard drill chucks to resist slipping under load. This is a practical bench or field kit for technicians who need a full fractional range without carrying a large case.

Key Features

• 13-piece set covering 1/16 inch to 1/4 inch in 1/64-inch increments
• High-speed steel construction rated for heavy-duty metalworking and multipurpose use
• 135-degree split point for self-centering starts and reduced walking on metal surfaces
• Black oxide and bronze oxide dual finish for reduced friction and improved durability
• Maintenance length design at 4.125 inches overall for improved rigidity in tight spaces
• Round shank with three flats prevents bit rotation in chuck under load
• Metal storage case included for organized field or bench storage

Compatibility

Designed for use with standard three-jaw drill chucks accepting straight-shank bits; suited for metalworking and multipurpose drilling applications across HVAC, plumbing, electrical, and general mechanical maintenance trades.

Installation Notes

HSS drill bits should be installed in a properly tightened chuck before use to prevent slipping. When drilling metal, use appropriate cutting fluid or lubricant to reduce heat buildup and extend bit life. Reduce feed pressure as the bit breaks through to avoid grabbing or bit damage. Inspect bits for chipping or dulling regularly and replace any bit that shows wear to maintain hole quality and safe operation.