Drillco 5/16 High Spiral Flute 5/16 Shank Nitro Construction Reamer (428N120)
Drillco 428N120 5/16 High Spiral Flute 5/16 Shank Nitro Construction Reamer is built for heavy-duty reaming in structural steel fabrication, bridgework, and industrial assembly applications. The tapered point ensures smooth entry into misaligned or off-center holes, delivering precise and accurate hole enlargements. Its high spiral flutes and Nitro surface treatment enhance chip removal, reduce heat buildup, and maintain cutting efficiency. The 3-flats reduced shank provides a secure, slip-free grip in the chuck, ideal for demanding fabrication tasks.
5/16-inch high spiral flute Nitro construction reamer with 5/16-inch shank
Tapered point for smooth entry into misaligned or undersized holes
High spiral flutes for efficient chip removal and smooth surface finish
3-flats reduced shank for secure, slip-free chuck grip
Most common angles for countersinking available: 60°, 82°, 90°
6 flutes for very fast shearing cuts
Higher flute count reduces chip size and chatter
Ensures precise, clean, and accurate hole enlargements
Improves chip removal and reduces heat buildup during cutting
Minimizes chatter for smoother cutting performance
Durable construction for long-lasting industrial use
Reliable performance in structural steel and bridgework applications
Technical Specifications:
Shank Size: 5/16 inch
Shank Type: 3-flats reduced shank
Point Type: Tapered point
Flute Type: High spiral flutes, 6 flutes for fast shearing
Countersink Angles: 60°, 82°, 90°
Surface Treatment: Nitro hard, protective coating
Applications: Structural steel fabrication, bridgework, industrial assembly
Product identification
- Brand: Drillco
- Model / MPN: 428N120
