Osg 61535 Screw Machine Drill Bit 0.1378 in Hss

Product Description

The OSG 61535 is a screw machine length drill bit engineered for high-performance drilling in metal fabrication and machining applications. Built from high speed steel (HSS) with a coated finish, it features a 130-degree faceted point angle and a web-thinned, tapered web configuration that reduces thrust and improves chip evacuation at entry. The straight-cylindrical shank measures 4.00 mm (0.157 inches) in diameter, and the overall tool length is 52.00 mm (2.047 inches). With a 2-flute regular spiral design and a flute-to-diameter ratio of 5xD, this bit delivers consistent performance in production drilling environments. It is installed by machinists, tool-and-die professionals, and maintenance technicians working with precision metalworking equipment.

The OSG 61535 is suited for drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Its screw machine length profile — shorter than jobber length — provides added rigidity and reduced deflection, making it well-suited for CNC machining centers, drill presses, and screw machine operations where hole accuracy and repeatability are critical. The Series 1100 designation identifies it within OSG's high-performance drill lineup.

Key Features

• High speed steel construction with coated finish for extended tool life in metal cutting
• 130-degree faceted point angle reduces walking and improves entry accuracy
• Web-thinned tapered web lowers thrust force and promotes clean chip flow
• Screw machine length body adds rigidity over standard jobber-length bits
• Right-hand cut, 2-flute regular spiral flute geometry
• Drill bit diameter tolerance of plus 0 to minus 0.018 mm for tight-tolerance holes

Compatibility

Designed for use in steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Compatible with standard straight-shank drill chucks on CNC machining centers, drill presses, and screw machines accepting a 4.00 mm (0.157 inches) shank diameter. Drill bit size range covers 0.1000 to 0.1500 decimal inch (3.50 to 5.00 mm).

Installation Notes

Installation is performed by machinists or qualified maintenance technicians. Secure the straight-cylindrical shank fully in a properly sized drill chuck or collet before operation, and verify runout before drilling production parts. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant for the workpiece material to maximize tool life, noting that this bit does not support coolant-through delivery.