Sgs 56028 Straight-flute Drill Bit No. 28 Solid Carbide

Product Description

The SGS 56028 is a straight-flute drill bit engineered for precision drilling in ferrous and hardened materials. Built from micrograin solid carbide, it carries a No. 28 wire size with a decimal diameter of 0.1405 inches and a 140-degree point angle that centers quickly and reduces thrust in hard workpieces. The two-flute, right-hand cutting geometry pairs with web thinning to improve chip evacuation in tough materials. The bright, uncoated finish leaves the carbide substrate exposed for clean cutting. Machinists and toolroom technicians working on CNC or manual drill press setups install this bit for short-run precision work where dimensional accuracy is critical.

This drill bit is sized for applications in cast iron, hardened steel, and general steel stock. The 15/16-inch flute length and maximum drilling depth of 3/4 inch suit it for shallow, tight-tolerance holes in tool and die work, fixture building, and precision part production. It conforms to DIN 6539 standards, making it a direct fit in shops that specify metric-aligned tooling geometry. The straight-flute design performs well in brittle materials where spiral flutes can cause chatter or micro-fractures at the cutting edge.

Key Features

• Micrograin solid carbide construction for rigidity and edge retention in hard materials
• 140-degree point angle reduces walking and lowers thrust force on entry
• Web-thinned geometry improves chip clearance and reduces cutting resistance
• Straight-flute design suited for drilling cast iron and brittle materials
• Right-hand cutting direction with uncoated bright finish
• Meets DIN 6539 standard for consistent geometry and interchangeability

Compatibility

Designed as a standard straight-flute carbide drill bit conforming to DIN 6539, compatible with any drill press, CNC machining center, or manual spindle holding a shank diameter of 0.1405 inches. Suitable for use in cast iron, hardened steel, and general steel workpieces as well as other hardened materials.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with carbide tooling. Secure the shank fully in a precision collet or drill chuck before operation and verify runout before drilling. Carbide is brittle and can fracture if subjected to side loads or impact; do not use in hammer or percussion drill applications. Inspect the cutting edges before each use and replace if chipping or wear is observed.