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National Stock Number:
5305-01-359-9446
Federal Supply Class:
5305
National Item Identification Number:
013599446
Description:
SCREW,SHOULDER
Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter, No 0 (0.060 IN.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below No. 10 (0.190 IN.) (5 mm) nominal diameter. No. 10 (0.190 IN.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use SCREW, EXTERNALLY RELIEVED BODY. For items with a No. 10 (0.190 IN.) (5 mm) or larger thread diameter without an inserted driver head, use BOLT, SHOULDER. Excludes BOLT, INTERNAL WRENCHING and SCREW, CAP, SOCKET HEAD.
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Manufacturer Information:
| 0441C0174-1 | 03538 | LOCKHEED MARTIN CORPORATION | | 0441C0174-1 | 54497 | MARTIN MARIETTA TECHNOLOGIES INC SUB OF MARTIN MARIETTA CORP AERO AND NAVAL SYSTEMS | | 250-20UNC-3A | D9182 | ZF INDUSTRIEANTRIEBE WITTEN GMBH |
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Techincal Specification:
| FASTENER LENGTH | 1.402 INCHES MINIMUM AND 1.406 INCHES MAXIMUM | | HEAD DIAMETER | 0.419 INCHES MINIMUM AND 0.437 INCHES MAXIMUM | | HEAD HEIGHT | 0.213 INCHES MINIMUM AND 0.219 INCHES MAXIMUM | | HEAD STYLE | FLAT CHAMFER | | INTERNAL DRIVE STYLE | HEXAGON | | MATERIAL DOCUMENT AND CLASSIFICATION | QQ-N-281 FED SPEC ALL MATERIAL RESPONSES OVERALL | | MATERIAL | NICKEL ALLOY 400 OR NICKEL ALLOY R-405 OVERALL | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | SHOULDER DIAMETER | 0.308 INCHES MINIMUM AND 0.310 INCHES MAXIMUM FIRST SHOULDER | | SHOULDER SHAPE | ROUND FIRST SHOULDER | | SHOULDER LENGTH | 0.745 INCHES MINIMUM AND 0.755 INCHES MAXIMUM FIRST SHOULDER | | WIDTH ACROSS FLATS | 0.156 INCHES NOMINAL | | THREAD DIRECTION | RIGHT-HAND | | THREAD CLASS | 3A | | THREAD LENGTH | 0.438 INCHES NOMINAL | | THREAD SERIES DESIGNATOR | UNC | | THREAD QUANTITY PER INCH | 20 |
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