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Gold spiral point tap with three flutes and plug chamfer

Greenfield Threading

Greenfield Threading Spiral Point Tap 285503 3/8-16 UNC HSS TiN 3 Flute

SKU CH-YNYD-0J8AV

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.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $12.99
Cheaper than about 82% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-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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