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Bright spiral point tap 3/8-24 UNF three flutes high speed steel

Greenfield Threading

Greenfield Threading 357561 Spiral Point Tap 3/8"-24 UNF 3 Flutes Bright

SKU CH-RJW4-PR5KF

Spiral point tap cuts 3/8"-24 UNF threads in through holes with three flutes and a bright high-speed steel finish

  • Spiral point pushes chips forward for cleaner threading
  • 3/8"-24 UNF size matches precise fastener requirements
  • Three flutes balance chip clearance with cutting strength
  • High-speed steel construction resists wear during repeated use
  • Bright uncoated finish suits general-purpose tapping applications

Purpose and Fit

The Greenfield Threading 357561 is a spiral point tap for cutting 3/8"-24 UNF threads. It suits machinists and maintenance technicians producing right-hand internal threads in through-holes. The H1 limit and 2B class of fit meet standard tolerance requirements. It is not for blind-hole work or left-hand thread applications. Buyers needing larger diameters or different pitch series must select another tool.

Cutting Behaviour

The plug chamfer and spiral point push chips ahead of the tap, reducing torque and heat during through-hole tapping. Bright high-speed steel runs uncoated, so lubrication is essential to control temperature and extend edge life. Three flutes balance chip clearance with core strength for the 1 1/4 in thread length. No noise or power-draw data is published for this hand or machine accessory.

Included Value

The package contains the single tap identified by model 357561. No drill, gauge, holder or coating service is bundled. The 75 percent thread drill size of 8.50 mm guides the separate drill-bit purchase. Users must supply cutting fluid and a compatible tap wrench or machine adapter to complete the operation.

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

How do I install the Greenfield Threading 357561 Spiral Point Tap 3/8"-24 UNF and what step is commonly missed?

Clamp the workpiece, drill an 8.50 mm hole to 75 percent thread depth, apply cutting fluid, start the tap square using the 3/8"-24 UNF thread size and 3-flute spiral point design, then reverse frequently to clear chips — the step often skipped is maintaining perpendicular alignment throughout the 1 1/4 in thread length

What maintenance or replacement will the Greenfield Threading 357561 Spiral Point Tap 3/8"-24 UNF need over time?

The high-speed steel bright uncoated finish on the 3-flute spiral point tap will dull with use; resharpen the cutting edges or replace the tap when thread quality degrades or the H1 thread limit can no longer produce a 2B class of fit

What limit appears first when using the Greenfield Threading 357561 Spiral Point Tap 3/8"-24 UNF continuously?

Chip evacuation in the 3-flute spiral point design becomes the limiting factor during sustained threading, especially at the full 1 1/4 in thread length in deeper holes where the bright uncoated high-speed steel generates more heat

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