Greenfield Threading
Greenfield Threading Spiral Point Tap 285503 3/8-16 UNC HSS TiN 3 Flute
Cuts 3/8-16 UNC threads in through-holes using high-speed steel with TiN coating for longer tool life
- Plug-style tap starts threads cleanly in through-holes
- TiN coating reduces friction and extends cutting life
- High-speed steel withstands heat during repeated use
- Three flutes clear chips efficiently for smoother cuts
- H3 limit and 2B fit deliver precise 3/8-16 UNC threads
Application Scope
The Greenfield Threading Spiral Point Tap 285503 cuts 3/8-16 UNC threads in through-holes. It suits machinists and maintenance technicians who need right-hand internal threads for standard coarse-pitch fasteners.
Sustained Cutting Behaviour
The high-speed steel substrate with TiN coating resists heat buildup during repeated passes. The spiral-point geometry pushes chips ahead of the tap, reducing flute clogging and torque spikes in longer production runs.
Build and Mounting Implications
Three flutes on a 2 15/16 in overall length provide balanced chip clearance and strength. The H3 limit targets a 2B class of fit, while the 0.3125 in drill size guides hole preparation for consistent engagement.
Highlights
- Plug-style tap starts threads cleanly in through-holes
- TiN coating reduces friction and extends cutting life
- High-speed steel withstands heat during repeated use
- Three flutes clear chips efficiently for smoother cuts
- H3 limit and 2B fit deliver precise 3/8-16 UNC threads
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
How much heat does the HSS TiN 3-flute tap generate during continuous threading?
The high-speed steel body with titanium nitride coating reduces friction, so heat build-up stays low even during extended production runs.
What drill size must I already have to prepare the hole for this 3/8-16 UNC tap?
A 0.3125 in drill bit is required to produce the 75 percent thread engagement specified for the H3 limit.
Will the 2 15/16 in overall length fit my older tap wrench or CNC holder?
The standard 2 15/16 in length matches common 3/8-16 UNC tooling, so it seats in most legacy wrenches and holders without adapters.
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