Allegiance Rotary Burr 2978425 SE-3 3/8 Inch (1/4 Inch Shank Tungsten Carbide Oval Egg Shape Double Cut 25000 Max RPM Weld Grinding Contour Steel)

Allegiance 2978425 SE-3 3/8-Inch Oval Shape Carbide Rotary Burr

The Allegiance 2978425 SE-3 3/8-Inch Oval Shape Carbide Rotary Burr is a specialized rotary grinding and shaping bit engineered for machining rounded grooves, blending internal egg-shaped fillets, hollowing out metal pockets, and smoothing curved contours without digging into target workpieces. Rated for operational speeds up to 25,000 RPM on a standard 1/4-inch steel shank, this tungsten carbide head bit features an egg-shaped oval head profile and double-cut cross-flute geometry that breaks material into fine chips to eliminate chatter. Outfitted with a 3/8-inch head diameter and a 5/8-inch length of cut across a 2-5/16-inch overall length, this 0.15-pound rotary tool accessory executes precision metal removal.

Best Used For:

• Rounded Groove & Egg-Profile Machining: Carving smooth curved bottom channels and concave radii in die molds and steel fabrications.
• Internal Pocket & Cavity Hollowing: Removing interior wall stock and shaping rounded recesses in iron castings and machined parts.
• Engine Cylinder Head & Porting Modifications: Smoothing curved runner transitions and radiused internal port walls in automotive cylinder heads.

Key Performance & Safety Features

• Tungsten Carbide Cutting Head: High-density carbide composition brazed to a hardened steel shank maintains cutting edge hardness under intense heat.
• Oval / Egg (SE-3) Head Profile: Rounded egg geometry provides smooth clearance for multi-directional contouring and curved fillet blending without gouging.
• Double-Cut Cross-Flute Design: Opposing cutting flutes produce granular metal chips to minimize tool chatter and deliver smooth surface finishes.
• 25,000 Maximum RPM Speed Rating: Precision-balanced construction accommodates pneumatic and electric 1/4-inch die grinders at full operating speed.
• Hardened 1/4-Inch Steel Shank: Precision-ground steel shank mounts securely into standard 1/4-inch collets to eliminate rotational runout.
• Multi-Metal Substrate Compatibility: Cuts efficiently through structural steel, cast iron, stainless steel, brass, bronze, and aluminum.

What's Included

• (1) Allegiance 2978425 SE-3 3/8-Inch Double Cut Oval Shape Solid Carbide Burr

Technical Specifications

Pro-Tip: Execute smooth sweeping motions along curved contours; maintaining high die grinder speeds near 25,000 RPM allows the oval egg-shaped flutes to blend internal radiused fillets without digging or leaving chatter marks.