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Vintage TRW United-Greenfield machinist hand tap set for cutting 1/4-28 NF internal threads. This set includes two high speed steel taps stored in the original TRW United-Greenfield blue box.

Tap markings include:

TRW 1/4-28 NF H3 HS U7 USA

These vintage USA-made machinist tools are straight flute hand taps typically used with a tap wrench for threading steel, aluminum, and other metals.

TRW United-Greenfield cutting tools are well known in machine shops for durability and precision, and older USA-made versions are sought after by machinists and tool collectors.

Original box label shows:

Part numbers 14058 5303 and size 1/4-28 NF H3

Please review all photos carefully for condition and markings.

Measurements

Tap length: approx 3.25 in

Thread size: 1/4-28 NF

Shank size: approx 1/4 in

SHIPPING & RETURNS

Ships via USPS Ground Advantage (or Priority Mail if item weight exceeds 1 lb)

Handling Time: 1 business day

Returns: 30-day return window; buyer pays return shipping