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Bright high-speed steel straight-flute hand tap plug three flutes #3-56 UNF 1.81 in overall length

Greenfield Threading

Greenfield Threading 300645 Straight Flute Hand Tap Plug, 3 Flutes

SKU CH-ASDS-3TG4R

A straight-flute hand tap for #3-56 UNF threads, plug style with three flutes and H2 limit in high-speed steel

  • Right-hand threads suit standard fasteners
  • High-speed steel resists wear during tapping
  • Plug chamfer starts threads in through-holes
  • Bright finish prevents coating buildup
  • #46 drill size matches 75 % thread depth

Greenfield Threading 300645 Hand Tap

This Greenfield Threading 300645 straight flute hand tap creates internal UNF threads. The plug chamfer starts threads easily in through-holes or deep blind holes. High speed steel construction handles general-purpose tapping in steel, aluminium and plastic. Right-hand cut suits standard fastening applications.

Check thread size and drill before ordering

Verify the required thread is #3-56 UNF with a 2B class of fit. The tap needs a #46 drill size for 75 percent thread engagement. Confirm the workpiece material suits high speed steel and that a 1.81 inch overall length fits your holder or tap wrench.

Bright finish and H2 limit guide daily use

The bright uncoated surface requires cutting fluid to prevent galling and extend tool life. H2 thread limit produces a standard fit for most assemblies. Three flutes provide good chip clearance in ductile materials. Square shank drives securely in a tap wrench for hand operation.

How it compares

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

Price $7.99
Cheaper than about 91% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameCHICAGO-LATROBE

Questions about this item

What comes in the package and what else do I need to start tapping?

The box contains the CHICAGO-LATROBE 300645 straight-flute hand tap. You will need a #46 drill bit for the 75 percent thread hole, a tap wrench to turn the tool, and cutting fluid for the operation.

How do I choose between the available thread sizes for this tap?

This model is a single specification: #3-56 UNF, plug style, H2 limit, class 2B fit. There are no alternative sizes or versions listed for the 300645, so you simply verify that your application calls for this exact thread.

What does the 1.81 in overall length mean when I am using the tap by hand?

The tap measures 1.81 inches from end to end with a .5 inch thread length. The remaining shank and square fit a standard tap wrench, giving you full control for hand threading in a through-hole or blind-hole application.

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