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
Silver metal tap with straight flutes and threaded tip

Westward

Westward 2LWN1 Straight Flute Hand Tap 5/16"-18 Bottoming 4 Flutes UNC

SKU CH-5VZD-ZQ4CM

Cuts 5/16"-18 UNC threads to the bottom of blind holes with four-flute high-speed steel

  • Product typeHole, Drill, Bore & Wire Gauges
  • High Speed Steel construction resists wear during repeated threading
  • Bottoming chamfer cuts threads close to the bottom of blind holes
  • Four straight flutes provide efficient chip clearance in through or blind holes
  • UNC 5/16"-18 thread size matches standard coarse-pitch fastener requirements
  • Right-hand orientation suits conventional clockwise tapping operations

Threading Tool for 5/16"-18 Holes

This straight flute hand tap cuts UNC threads in a 5/16"-18 size. It is designed for through-hole and blind-hole work where a bottoming chamfer is required. The high-speed steel construction suits general-purpose metalworking tasks. Machinists and maintenance technicians use it for repair and small-batch production.

Bottoming Chamfer Limits Thread Depth

The bottoming design provides only a short lead of 1 to 2 threads before full cutting begins. This restricts use to holes where the thread must start close to the bottom. It cannot start threads in a fresh hole as easily as a taper or plug tap. Users must drill the correct tap drill size and ensure adequate chip clearance.

High-Speed Steel with Bright Finish

The tap is made from high-speed steel and ships with an uncoated bright surface. Four straight flutes provide chip evacuation in ductile materials. The right-hand cut follows standard UNC rotation. The H5 thread limit defines the pitch diameter tolerance for a standard class of fit. No coating means lubricant is essential during use.

How it compares

Measured against everything we stock in Utility & Specialty Hand Tools, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 90% of the 2,474 comparable items (median $23.99).

Specifications

Product
Brand nameWestward
Product typeHole, Drill, Bore & Wire Gauges

Questions about this item

Should I choose the 5/16"-18 UNC bottoming tap or look for a different thread size?

Choose the 5/16"-18 UNC bottoming tap when you need to cut internal threads to the bottom of a blind hole in that specific diameter and pitch.

What does the H5 thread limit mean once the tap is in the machine?

The H5 limit produces a thread slightly larger than basic size, giving a looser fit that eases assembly and suits general-purpose work.

How does the straight-flute design affect chip removal in practice?

Straight flutes push chips ahead of the tap, so they work best in through holes or blind holes where you can clear chips frequently.

More in Utility & Specialty Hand Tools

Similar items