Sgs 51344 Drill Bit Letter F 0.2570 in Solid Carbide Altin

Product Description

The SGS 51344 is a solid carbide screw machine length drill bit sized to Letter F (0.2570 inches diameter) and engineered for demanding metal-cutting applications. It features a 145-degree notched point geometry with web thinning on a tapered web, which reduces thrust force and improves penetration in hard and abrasive workpiece materials. The AlTiN finish — applied under SGS's Ti-NAMITE-A proprietary process — provides high heat resistance and extended tool life in dry or near-dry cutting conditions. With an overall length of 3.125 inches and a straight shank diameter of 0.3125 inches, the bit fits standard drill chucks and CNC toolholders used in production environments. Installed and operated by machinists and toolroom professionals.

This drill bit is designed for cutting alloy steels and titanium alloys where heat generation and tool wear are primary concerns. The screw machine length (stub) configuration provides added rigidity compared to jobber-length bits, making it well suited for short-hole drilling on CNC machining centers, drill presses, and screw machines. The regular spiral flute geometry supports chip evacuation in through-hole and blind-hole operations across production and job-shop settings.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard-material drilling
• AlTiN (Ti-NAMITE-A) coating for elevated heat resistance and extended tool life
• 145-degree notched point with web thinning reduces entry thrust and centers drill accurately
• Screw machine (stub) length at 3.125 inches OAL provides superior rigidity over jobber-length bits
• Right-hand cut, regular spiral flute with 2 margins for consistent hole geometry
• Straight shank at 0.3125 inches diameter fits standard chucks and collets without adapters

Compatibility

Designed as a screw machine length replacement or production drill bit for operations on alloy steels and titanium, fitting standard straight-shank drill chucks and collets accepting a 0.3125-inch shank in CNC machining centers, drill presses, and automatic screw machines.

Installation Notes

Installation and operation should be performed by qualified machinists or toolroom technicians familiar with carbide tooling. Secure the straight shank fully in a collet or drill chuck to the manufacturer-recommended engagement depth before commencing any cut. Carbide tooling is brittle — avoid side loading, interrupted cuts without appropriate feed reduction, or dropping the bit on hard surfaces. Follow your machine tool's spindle speed and feed rate specifications for the workpiece material and bit diameter; consult SGS cutting data tables for Series 135 carbide drills when setting up the operation.