Drill bit Proline 77185 — metal drill bit Ø18.5 mm, length 198 mm, 1 pcs

Proline 77185 is a single HSS metal drill bit with an 18.5 mm diameter and an overall length of 198 mm, intended for drilling steel and other ferrous and non‑ferrous metals. The bit features a 135° point angle with chamfering adjustment to speed up center starting and reduce walking, and it is fully precision ground to ensure straightness and accurate hole geometry. Supplied as one piece in protective packaging, this drill bit is suitable for workshop, construction, and repair tasks that require a mid‑size diameter and reliable metal cutting performance.

Advantages

The drill bit is manufactured from refined high‑speed steel (HSS), which provides increased abrasion resistance, improved resilience and higher torsional strength compared with standard carbon steel bits. Fully ground flutes and cutting geometry deliver high precision, consistent hole diameter and better straightness, while the 135° point with chamfering adjustment shortens lead‑in time and reduces the need for repeated center punching. The single‑piece supply and protective tube packaging help keep the cutting edge intact until use.

Suitable for

• Drilling holes in structural and sheet metal
• Workshop and maintenance drilling tasks
• Construction site metalwork and repair jobs
• Machine and hand drilling where an 18.5 mm hole is required

Key specifications

• Material: refined high‑speed steel (HSS)
• Diameter: 18.5 mm
• Overall length: 198 mm
• Point angle: 135° with chamfering adjustment
• Manufacturing: fully ground for precision and straightness
• Resistance: increased abrasion resistance and improved torsional strength
• Packaging: single piece in protective plastic tube

How to use

Secure the workpiece and mark the drilling position; use a center punch if necessary to aid precise start. Fit the 18.5 mm drill bit into a compatible drill chuck and tighten securely. When drilling metal, use steady feed pressure and appropriate cutting speed for HSS bits—moderate speed for larger diameters—and apply cutting fluid to reduce heat and extend tool life. Withdraw the bit periodically to clear chips and avoid clogging. After completion, clean chips from the hole and inspect the edge for any burrs.

Usage recommendations

For best results with this Proline HSS drill bit, use suitable cutting fluid, moderate spindle speeds, and firm but controlled feed. Store the bit in its protective tube when not in use to preserve the ground cutting edges and ensure consistent drilling performance.