NSN 5310-01-388-7956, 5310013887956
NUT,SELF-LOCKING,EXTENDED WASHER

Federal Supply Classification: FSC 5310 - Nuts and Washers
National Item Identification Number: NIIN 013887956
Codification Country: United States
Item Name Code: INC 29730
Criticality: ( )
Hazardous Material Indicator Code: (N) There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials.

Availability: Readily Available Qualified Suppliers: Currently qualifying suppliers

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DLMS^® Summary

National Stock Number 5310-01-388-7956

National Stock Number (NSN) 5310-01-388-7956, or NIIN 013887956, (nut,self-locking,extended washer) was assigned April 8, 1994 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.

There are no manufacturer part numbers associated to this NSN.

This part number has not been procured by the US Government in over 5 years.

This NSN is unique to one weapons system.

Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Mar 18, 2014, this NSN's acquisition method was noted as: Not established. Not established.

This NSN is assigned to Item Name Code (INC) 29730. [A NUT HAVING 6 FLAT SIDES AND AN INTEGRAL WASHER WHICH EXTENDS BEYOND THE FLATS OR PERIPHERY. AN INTEGRAL FEATURE IS INCORPORATED FOR LOCKING ON THE THREADS OF A MATING MEMBER.]. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 5310013887956 does not contain precious metals.

This information was last updated on Aug 01, 2025.

Technical Characteristics

NUT STYLE: (ACTA) SLOTTED HEXAGON
CRITICALITY CODE JUSTIFICATION: (CRTL) FEAT
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: (STDC) QQ-P-416, TY2, CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NOMINAL THREAD SIZE: (CQJX) 0.250 INCHES
THREAD CLASS: (AAJD) 3B
THREAD DIRECTION: (AAJF) RIGHT-HAND
WIDTH ACROSS FLATS: (ASDB) 0.305 INCHES MINIMUM AND 0.315 INCHES MAXIMUM
OVERALL HEIGHT: (ABKW) 0.173 INCHES MINIMUM AND 0.203 INCHES MAXIMUM
THREAD SERIES: (BZRR) UNJF
SPECIAL FEATURES: (FEAT) SAFETY CRITICAL THREAD PER FED STD H28/20 SYSTEM 22
SURFACE TREATMENT: (SFTT) CADMIUM OVERALL AND CHROMATE OVERALL
WASHER THICKNESS: (ADEM) 0.020 INCHES NOMINAL
LOCKING FEATURE: (AAUM) PREVAILING TORQUE ALL METAL DESIGN
LUBRICATION: (ABAJ) DRY FILM LUBRICANT
MATERIAL: (MATT) STEEL COMP 1035 OVERALL OR STEEL COMP 1042 OVERALL OR STEEL COMP 1137 OVERALL OR STEEL COMP 4027 OVERALL OR STEEL COMP 4037 OVERALL OR STEEL COMP 8740 OVERALL
WASHER OUTSIDE DIAMETER: (AAVX) 0.420 INCHES MAXIMUM
THREAD QUANTITY PER INCH: (CMLP) 28