Description

Drillco 427N220 1-5/16 Spiral Flute 3/4 Shank Nitro Construction Reamer is designed for heavy-duty reaming in structural steel fabrication, bridgework, and assembly projects. This Nitro construction reamer features a black and gold surface treatment that creates a hard protective layer, increasing hardness without brittleness while providing maximum lubricity. The spiral flute design improves chip removal, reduces heat buildup, and ensures precise, clean hole enlargements. Made from premium-grade cobalt high-speed steel (HSS), it can drill harder materials approximately 30% faster than standard HSS. The self-centering 135° split-point reduces walking and lowers thrust for controlled cutting, while the 3-flats reduced shank ensures secure, slip-free gripping in the chuck. The longer shank design is ideal for use in turret lathes and applications requiring extended reach.

Features:

1-5/16-inch Nitro spiral flute construction reamer with 3/4-inch shank
Black and gold Nitro surface treatment for hardness and maximum lubricity
Spiral flutes for efficient chip removal and consistent cutting
Self-centering 135° split-point minimizes walking and reduces thrust
3-flats reduced shank prevents slipping in the chuck
Most common angles for countersinking available: 60°, 82°, 90°
4 flutes for improved material removal rate and surface finish
Longer shank for use in turret lathes and extended reach applications

Benefits:

Ensures precise, clean, and smooth hole enlargements
Handles harder materials efficiently and faster than standard HSS
Improves chip removal and reduces heat buildup during cutting
Provides versatility with multiple countersinking angles and flutes
Durable construction minimizes replacement frequency and downtime

Technical Specifications:

Model: 427N220
Size: 1-5/16 inch
Shank Size: 3/4 inch
Shank Type: 3-flats reduced shank
Point Type: Tapered point, 135° split-point
Flute Type: Spiral flutes, 4 flutes for improved removal rate
Material: Premium-grade cobalt HSS
Surface Treatment: Black and gold Nitro coating for hardness and lubricity
Shank Length: Longer shank for turret lathe use
Countersink Angles: 60°, 82°, 90°
Applications: Structural steel fabrication, bridgework, assembly, hard material reaming, turret lathe operations