Hertel C.401.0026 Jobber Drill Bit 0.26 Mm Hss

Product Description

The HERTEL C.401.0026 is a high speed steel jobber-length drill bit ground to a 118-degree standard point angle. Measuring 0.26 mm (0.0102 inches) in diameter with an overall length of 19 mm (0.748 inches), this bit is built for precise, small-diameter drilling in general-purpose metalworking and machining applications. The bright, uncoated finish indicates an unmodified HSS substrate suitable for a broad range of workpiece materials. Two spiral flutes clear chips efficiently during right-hand rotation. Machinists, tool-and-die technicians, and precision fabricators reach for bits in this sub-millimeter range when drilling pilot holes, through-holes in thin stock, or fine-detail features in ferrous and non-ferrous metals.

This drill bit fits general-purpose production and maintenance machining environments where extremely small-diameter holes are required. Typical applications include PCB-adjacent metalwork, instrument components, watch and clock parts, medical device fabrication, and small fastener pilot holes. The straight-cylindrical shank seats directly into standard drill chucks, collets, and precision micro-chuck systems capable of holding sub-millimeter tooling. Coolant-through capability is not available on this model, so conventional flood or mist cooling is used at the machine when drilling harder materials.

Key Features

• 0.26 mm (0.0102 inches) diameter for precision small-hole drilling
• 118-degree standard point angle for general-purpose entry geometry
• High speed steel construction provides adequate toughness for ferrous and non-ferrous workpieces
• Bright, uncoated finish — no post-grind thermal treatment that could alter substrate hardness
• Two spiral flutes promote chip evacuation in deep, small-diameter bores
• Straight-cylindrical shank for compatibility with standard chucks and collets
• Right-hand cutting direction — mounts in conventional clockwise-rotation spindles

Compatibility

Designed as a general-purpose jobber drill bit for use in any drill press, CNC machining center, or hand-held precision drill capable of accommodating a straight-cylindrical shank at sub-millimeter diameters.

Installation Notes

Sub-millimeter drill bits are fragile and require a rigid, vibration-free machine setup to avoid breakage. Secure the workpiece firmly before drilling and use the lowest practical feed rate consistent with the spindle speed recommended for HSS tooling at this diameter. Inspect the bit tip under magnification before each use — uncoated HSS at this size is susceptible to edge chipping if mishandled. Follow standard shop safety practices: eye protection is required, and spindle speed should be set appropriately for the workpiece material and bit diameter before the cut is started.