Greenfield Threading
Greenfield Threading Spiral Point Tap 5/16"-18 UNC 3 Flutes 300016
Spiral point tap cuts 5/16"-18 UNC threads in through-holes using three-flute high-speed steel
- Spiral point pushes chips forward for cleaner through-holes
- High-speed steel construction resists wear during repeated threading operations
- 5/16"-18 UNC size matches common fastener specifications
- Three-flute design balances chip clearance with cutting stability
- Bright uncoated finish suits general-purpose tapping in steel and iron
Spiral Point Tap 5/16"-18 UNC
This high-speed steel spiral point tap cuts 5/16"-18 UNC threads in through-holes. The three-flute design pushes chips ahead of the cut to reduce binding in steel and aluminium. It is sized for machinists and maintenance technicians who need reliable thread production in general-purpose materials.
Replaces worn or undersized taps
Swap this in when an existing tap no longer holds pitch diameter or when a straight-flute tap loads up with chips in deep holes. The spiral point geometry is worth the change for production runs where chip evacuation slows cycle time; it adds less value for very shallow holes or blind-hole work where a bottoming lead is required.
Standard tap wrench or CNC holder
The 2 23/32 inch overall length and 1 1/8 inch thread length fit common tap holders without adapters. Use the specified 75 percent thread drill size F to avoid oversize holes that weaken the thread. The bright uncoated finish requires cutting fluid to prevent galling; running dry is the most common cause of premature wear.
Highlights
- Spiral point pushes chips forward for cleaner through-holes
- High-speed steel construction resists wear during repeated threading operations
- 5/16"-18 UNC size matches common fastener specifications
- Three-flute design balances chip clearance with cutting stability
- Bright uncoated finish suits general-purpose tapping in steel and iron
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
What drill size matches the 75 percent thread spec for this 5/16"-18 tap?
The 75 percent thread drill size is F for this 5/16"-18 UNC tap.
How do I avoid breaking the tap when starting threads in a blind hole?
Use the spiral point design to push chips ahead; keep the tap perpendicular and apply steady pressure with cutting fluid.
When should I replace this high-speed steel tap?
Replace when cutting edges dull, threads gauge out of 2B tolerance, or flutes show chipping after repeated use.
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