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Greenfield Threading 313562 straight flute hand tap, 7/16"-20 UNF, plug style, three flutes, black oxide finish

Greenfield Threading

Greenfield Threading 313562 Straight Flute Hand Tap 7/16"-20 UNF Plug 3 Flutes

SKU CH-1PRN-XQDH2

High-speed steel straight-flute hand tap cuts 7/16"-20 UNF threads with three flutes and a plug chamfer for through-hole work

  • Cuts 7/16"-20 UNF threads accurately with H11 thread limit
  • High-speed steel construction with black oxide resists wear
  • Spiral point design pushes chips ahead for smoother tapping
  • Three flutes provide balanced cutting and chip clearance
  • 75 % thread drill size 9.95 mm ensures proper fit

Thread Cutting for 7/16"-20 UNF

This Greenfield Threading straight flute hand tap cuts internal threads to a 7/16"-20 UNF specification. The H11 thread limit and Class 1B fit suit general-purpose threading tasks. Three flutes provide chip clearance during manual operation. It is intended for machinists and maintenance technicians creating new threads or repairing damaged ones.

High Speed Steel with Black Oxide

High speed steel construction resists wear during hand tapping. The black oxide finish reduces friction and helps retain cutting fluid. A 75 percent thread depth engages with a 9.95 mm drill size for proper thread formation. Right-hand cutting direction matches standard fastener orientation.

Plug Chamfer for Through Holes

The plug chamfer design suits through-hole applications and general threading work. Overall length measures 3 1/8 inches with a 1 7/16 inch thread length for reach and control. This tap requires a suitable tap wrench and cutting fluid, neither of which are included. It does not suit bottoming operations or machine tapping without adaptation.

Highlights

  • Cuts 7/16"-20 UNF threads accurately with H11 thread limit
  • High-speed steel construction with black oxide resists wear
  • Spiral point design pushes chips ahead for smoother tapping
  • Three flutes provide balanced cutting and chip clearance
  • 75 % thread drill size 9.95 mm ensures proper fit

Specifications

BrandGREENFIELD THREADING

Questions about this item

How do I install the 7/16"-20 UNF tap and what step is often missed?

Drill a 9.95 mm hole for 75 percent thread depth, then run the plug-style tap straight with steady pressure; the step most people skip is using cutting fluid to prevent the high-speed steel flutes from loading up.

What maintenance or replacement will the 313562 tap need over time?

The black-oxide coating on the high-speed steel flutes wears away with use; once the cutting edges dull or chip, the tap must be replaced because it cannot be economically resharpened.

What limit appears first when tapping multiple holes in a row?

Heat builds up in the H11-limit flutes during sustained cutting, causing the tap to lose hardness and cut oversize threads before the tool physically breaks.

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