A-A-51282
9 December 1985
COMMERCIAL ITEM DESCRIPTION
GAGE, THICKNESS, DIAL INDICATING
The General Services Administration has authorized the use of this commercial item description.
This commercial item description covers a precision dial indicating gage designed for measuring the thickness of ophthalmic lens blanks. The instrument shall be designed for long service and retain accuracy without constant recalibration.
Salient characteristics:
Shall be capable of measuring lens thickness up to 15 millimeters and accommodating lens diameter up to 72 millimeters.
Shall be a self-standing table top model with the base and caliper made of cast iron or tool steel. Base and caliper shall be either made of one piece casting or composite type.
The gage for thickness measurement shall be dial type having not less than 1-3/4 inch diameter dial face. The dial shall be graduated in 0.1 millimeter steps from 0 to 10 millimeters. Accuracy shall be within ± 0.1 millimeter from zero to full scale. The dial face shall be rotatable and lockable with a thumbscrew.
The anvil points shall be button type made of hardened steel. Bottom anvil shall be adjustable to allow for zero calibration.
Shall be provided with a lever control such that when pressing down the lever lifts the spindle, releasing it and lets the spindle contact the specimen to be measured.
Each gage shall be permanently and legibly marked with the manufacturer’s name or registered trademark.
Workmanship. The lens thickness gage shall be free from defects which detract from their appearance or impair their serviceability.
Unit. Each (EA). One gage, as specified, constitutes one unit.
Contractor certification. The contractor shall certify that the product offered meets the salient characteristics of this description and conforms to the producers’ own drawings, specifications, standards, and quality assurance practices. The Government reserves the right to require proof of such conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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