Twist drill bit DeWalt DT4917-QZ — right-hand rotation, 1 pc, blister pack

DeWalt DT4917-QZ is a single-piece twist drill bit designed for right-hand rotation and supplied in a blister pack. Engineered for drilling a range of metals, including high alloy steels and stainless materials, this drill bit features a high-cobalt composition and an optimised tip and flute geometry to improve penetration speed and cutting life. The drill bit is offered as a replacement or occasional-use tool where a reliable, long-lasting metal drilling solution is required.

Advantages

The 5% cobalt content maintains a sharper cutting edge and provides significantly longer life compared with standard HSS-R bits. A no-walk tip reduces the tendency to skid on the work surface and enables cleaner, more accurate, burr-free holes from 5 mm and above. The spin-proof three-sided shank provides improved grip in the chuck to minimise slipping during operation. Optimised flute geometry speeds up cutting, removes chips more effectively and reduces heat build-up during drilling.

Suitable for

• Portable and stationary drilling of heat- and acid-resistant steels
• Drilling welded seams, cast iron and bronze
• Working with stainless and chrome-nickel steels
• Replacement or occasional-use drill bit for metal fabrication and maintenance tasks

Key specifications

• Type: twist drill bit, right-hand rotation
• Material enhancement: 5% cobalt high-speed steel
• Tip: no-walk tip with recessed cutting wings for reduced burrs
• Shank: three-sided anti-slip shank (spin-proof) for improved chuck grip (diameters from 5 mm)
• Core design: reinforced central core increasing thickness toward the chuck for improved fracture stability (from 4.8 mm)
• Performance: optimised flute geometry for faster penetration and chip evacuation
• Drilling suitability: metals with tensile strength up to 1100 N/mm²
• Colour/finish: gold-coloured coating
• Quantity: single piece in blister pack
• Nominal length and diameter: length approx. 151 mm, diameter 13 mm

How to use

Fit the DeWalt twist drill bit into a compatible drill chuck and tighten securely, ensuring the three-sided shank seats properly to reduce slippage. Select an appropriate drilling speed and apply steady pressure; for hard or high-alloy steels use lower speeds and coolant or cutting fluid to manage heat. For accurate starts on smooth surfaces, use the no-walk tip to position the bit before applying full feed. Withdraw the bit periodically on long holes to clear chips and avoid overheating.

Usage recommendations

Use cutting fluid or coolant when drilling high alloy or stainless steels to extend tool life and improve hole quality. For best results, match drilling speed to material hardness, clamp or secure workpieces, and ensure the chuck is compatible with the three-sided shank to prevent slipping.