Unlock guaranteed accuracy in metric-threaded assemblies with the Dormer Pramet A400 M4 HSS ST Straight Shank Subland 90° Standard Length drill (DIN 8374). This precision tool is purpose-built to create reliable chamfered clearance holes, ensuring smooth tapping and flawless fastener seating every time.

• 118° pilot with 90° chamfer — A two-step geometry that delivers a stable pilot hole followed by a precise chamfer at entry, perfect for standard metric threads and clean, reliable assembly fits.
• Steam oxide finish — A low-friction coating that minimizes sticking and built-up edge, extending tool life and delivering uniform chip evacuation during deep or batch drilling.
• Engineered pilot diameter and length — Specifically designed to produce the correct clearance drilling diameter and depth for standard threads, reducing rework and improving tapping success.
• Premium HSS material — High-speed steel construction provides dependable performance across steel, aluminum, and stainless steel, delivering consistent hole quality through a broad material range.
• Straight shank, DIN 8374 compatibility — Robust, vibration-resistant engagement with common chucks and collet systems, ideal for both CNC milling centers and conventional drill presses.
• Versatile, standard length (X4D) — A balanced geometry that suits tight work envelopes while delivering steady rigidity and predictable hole dimensions in a variety of applications.

Who benefits most: machinists and fabricators needing precise clearance holes for metric fasteners (such as M4) without compromising hole concentricity or finish. Ideal for automotive brackets, electrical housings, hydraulic blocks, and general mechanical assembly where clean chamfers and accurate hole size matter for reliable thread engagement.

Practical tips for best results: maintain proper lubrication/coolant to optimize tool life, select cutting parameters appropriate to the material, and use a stable fixturing setup to prevent deflection during entry and breakout. This drill excels in both CNC and traditional setups, delivering repeatable performance across throughput runs and prototyping cycles.