Hertel 83238782 Letter J Screw Machine Drill Bit Hss

Product Description

The HERTEL 83238782 is a screw machine length drill bit sized to letter J (0.2770 inches decimal equivalent) designed for heavy-duty drilling in metal fabrication, machining, and maintenance environments. Built from high-speed steel with an oxide coating, the bit features a 135-degree split point that reduces walking and lowers the thrust required to start a hole without a center punch. The shortened screw machine length body provides added rigidity in close-quarters applications such as drill presses, CNC machines, and turret setups where a standard jobber length bit would flex or chatter. Installation and use are handled by machinists and maintenance mechanics.

This bit is suited for production drilling and general-purpose metalworking where letter-size tooling is specified. The right-hand spiral flute design evacuates chips efficiently during through-hole and blind-hole operations. Its straight-cylindrical shank accommodates standard three-jaw drill chucks and collet-style tool holders. The heavy-duty grade and NAS 907 specification make it appropriate for aerospace-adjacent and industrial maintenance applications where dimensional tolerance and repeatable performance are required across high-cycle drilling runs.

Key Features

• Letter J size: 0.2770 inches decimal equivalent, within the 0.2500 to 0.3000 inch size range
• 135-degree split point reduces walking and decreases required feed force
• Web-thinned parallel web configuration improves chip clearance at the cutting tip
• High-speed steel construction with oxide coating for heat and wear resistance
• Screw machine (stub) length adds rigidity over jobber length bits in confined setups
• Meets NAS 907 specification for heavy-duty industrial and aerospace maintenance use

Compatibility

Designed as a direct-fit replacement for letter J screw machine length drill bits meeting NAS 907 specification. Fits any standard drill chuck or collet holder accepting a 0.2770 inch straight-cylindrical shank.

Installation Notes

This bit is installed and operated by machinists, toolroom technicians, and maintenance mechanics using standard drill presses, CNC machining centers, or hand-held power drills with appropriate chuck capacity. Ensure the shank is fully seated and the chuck is tightened securely before operating. Verify spindle speed is appropriate for the workpiece material and bit diameter before engaging the cut. Inspect the cutting edges and web thinning for wear or chipping before each use and replace the bit if edge integrity is compromised.