Drill bit Ghring Wiertło 5,5 XL-P (NWKp) HSS ø5.5 mm, grind 250-160

Ghring Wiertło 5,5 XL-P (NWKp) HSS ø5.5 mm, grind 250-160 is a high-speed steel (HSS) twist drill with a 5.5 mm working diameter and XL‑P (NWKp) flute geometry. It is intended for drilling precision through-holes in metal and other materials compatible with HSS tooling. The grind designation 250-160 describes its flute and point geometry designed to provide controlled cutting action and efficient chip evacuation when used in handheld or machine drills.

Advantages

The XL‑P (NWKp) geometry improves chip removal and reduces clogging compared with standard twist drills, which supports more stable cutting and consistent hole quality. Made from HSS, the drill offers wear resistance and can maintain a sharp cutting edge under typical metalworking conditions. Its 5.5 mm diameter provides a common size for precision through-holes, and the 250-160 grind helps ensure repeatable centring and controlled penetration.

Suitable for

• Drilling through mild and medium steel, cast iron, non‑ferrous metals and common alloys compatible with HSS drills
• Production or repair tasks requiring consistent 5.5 mm through-holes
• Use in handheld electric drills, drill presses and drilling machines
• Workshop and maintenance applications where controlled chip evacuation is beneficial

Key specifications

• Material: high-speed steel (HSS)
• Diameter: 5.5 mm
• Flute/geometry: XL‑P (NWKp) for improved chip evacuation
• Grind designation: 250-160
• Type: straight shank twist drill suitable for general-purpose metalworking

How to use

Select an appropriate drilling speed for HSS in the material being machined and secure the workpiece to avoid movement. Use cutting fluid or lubricant as required for the material to reduce heat and extend tool life. Start with a proper centre mark or pilot to improve positioning, then drill with steady feed pressure while keeping the drill aligned. Withdraw the drill periodically to clear chips if drilling deep holes, and inspect the tip for wear if repeated holes are required.

Usage recommendations

For best results, match spindle speed and feed to the workpiece material and use cutting fluid when drilling ferrous metals. Replace or regrind the drill when the cutting edge becomes dull to maintain hole accuracy. When drilling thin or delicate sheets, support the material to prevent deformation and reduce burr formation.