Expertly engineered for high-efficiency deep-hole threading operations in demanding environments, the Guhring Metric Bright Finish HSS Long Series Spiral Point Gun Tap range is the definitive industrial choice for machine tapping deep, hard-to-reach straight-through clearance holes. Operating on the standard 60° ISO Metric thread profile, these premium high-speed steel (HSS) tools feature an extended shank design that provides the critical reach required to clear deep pockets and complex fixtures without sacrificing tool alignment. Featuring a premium un-coated bright finish, these tools deliver an ultra-sharp cutting edge that significantly reduces friction, lowers cutting temperatures, and prevents work hardening in ductile materials. The specialized angular spiral point (gun nose) geometry shears structural materials cleanly and forcefully drives compact chips forward ahead of the tool cutting action. This reliable forward chip evacuation completely eliminates chip nesting and nesting-related tool failure when processing structural steels, mild steel, AS/NZS 3678 250 and 350 grade plate, free-cutting steels, and unalloyed case-hardened steels.

HSS APPLICATIONS

• Primary for machine tapping
• Ideal for Through holes 
• Great for cutting new threads
• Longer in length, Great for hard to reach places
• Suited for use in a variety of ferrous and non-ferrous materials
• Green Ring for cutting - Structural steels - mild steel, 250 and 350 plate, Free cutting steels, Case hardened steels

HSS TECHNICAL DATA

• Made from High Speed Steel
• Standard  - Guhring Std.
• Tolerance - ISO2 / 6H
• Surface - Bright Finish
• Guhring No. 998