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Last Modified: Nov 26, 2021

Part Number NAS498 Close Tolerance Screw

National Stock Number: 5305-00-059-7042

NAS498 Cross Reference Parts

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Summary Information (click on this NSN number for detailed information: 5305-00-059-7042)

Definition: Close Tolerance Screw, also referenced with federal logistics item name code 29294: A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. the nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. the head is designed to be held or driven with an inserted driver. it is not designed for rotation by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads.
Federal Supply Class (FSC): 5305
NIIN: 00-059-7042 (000597042)
NMF Description: BOLTS/NUTS/SCREWS NOI I/S
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