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FED-STD-H28/6A(1) NOT 4
Screw-Thread Standards for Federal Services Section 6 Gages and Gaging for Unified Screw Threads-UN and UNR Thread Forms
This section provides the standards for basic gaging principles, gaging practice, gage specifications, gage dimensions, gage measurements, measuring equipment, and calibration requirements for Unified inch screw threads (UN and UNR thread forms).
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Department of Defense [dod]