5-piece lot of vintage collectible Pratt & Whitney Co. adjustable rectangular split metric thread ring gages. All pieces are cleanly stamped with the iconic Pratt & Whitney Co. hallmark out of Hartford, Connecticut, U.S.A.
Pratt & Whitney precision tooling is highly sought after by tool collectors, precision machinists, and industrial historians. This specific set focuses entirely on hard-to-find early Metric (m/m) thread profiles with distinct multi-relief frame cuts.
Complete Size Inventory & Markings:
• 16 m/m — 1.5 m/m PI. (Stamped B.M. L., Hartford Conn. U.S.A. mark)
• 14 m/m — 1 m/m PI. (Stamped GO, B.M. L., ZQ, 5256 with original inspection wax/seal remnants)
• 12 m/m — 1.5 m/m PI. (Clear, clean factory script)
• 10 m/m — 1 m/m PI.
• 5 m/m — .75 m/m P. (Stamped MASTER — Small frame size)
Condition Notes:
• Crisp Historic Tooling: Excellent clear typography and manufacturer stamps. Deeply stamped sizing indices are fully legible.
• Thread Condition: Internal precision thread faces appear to be sharp and structurally sound
• Adjustment Hardware: Split tension gaps are intact, and integrated alignment calibration pins/screws are present.
Please inspect all photos closely for condition and details.
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