We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Bright uncoated spiral point tap 5/16-18 UNC three flutes 300016

Greenfield Threading

Greenfield Threading Spiral Point Tap 5/16"-18 UNC 3 Flutes 300016

SKU CH-RV8W-K1SR9

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.

How it compares

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

Price $9.99
Cheaper than about 88% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-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.

More in Bits, Hole Saws & Accessory Kits

Similar items