PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ST5M1291B2Connector,receptacle,electrical

The Boeing Company Div Defense · NSN 5935-00-550-9983 · FSC 5935 · No Item Name Available
Verified by PartsTable
NSN 5935-00-550-9983 — this item is cataloged by the U.S. Government under National Stock Number 5935-00-550-9983. Primary manufacturer part number: ST5M1291B2.
Features
  • Connector,receptacle,electrical — FSC 5935
  • Overall Diameter: 1.110 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN
  • Contact Removability: NONREMOVABLE SINGLE MATING END SINGLE CONTACT GROUPING
  • Nominal Thread Size: 0.688 INCHES IN
  • Thread Series Designator: UNEF
  • Precious Material and Weight: 0.013 GOLD GRAINS, TROY AND 0.013 SILVER GRAINS, TROY
  • Contact Surface Treatment: GOLD AND SILVER SINGLE MATING END SINGLE CONTACT GROUPING
  • Shell Material: STEEL
Applications
  • Electrical interconnection
  • Signal interface mating
  • Quick-disconnect coupling
General Description

The Connector,receptacle,electrical, cataloged under National Stock Number 5935-00-550-9983, is classified within Federal Supply Class 5935 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is The Boeing Company Div Defense. Government technical data includes 28 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5935-00-550-9983
Primary Part NumberST5M1291B2
Item NameConnector,receptacle,electrical
FSC / FSG5935 / 59 — No Item Name Available
ManufacturerThe Boeing Company Div Defense
StatusACTIVE
Overall Diameter1.110 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN
Contact RemovabilityNONREMOVABLE SINGLE MATING END SINGLE CONTACT GROUPING
Nominal Thread Size0.688 INCHES IN
Thread Series DesignatorUNEF
Precious Material and Weight0.013 GOLD GRAINS, TROY AND 0.013 SILVER GRAINS, TROY
Contact Surface TreatmentGOLD AND SILVER SINGLE MATING END SINGLE CONTACT GROUPING
Shell MaterialSTEEL
Included Contact Quantity13 SINGLE MATING END SINGLE CONTACT GROUPING
Shell Surface TreatmentCADMIUM AND CHROMATE
Shell TypeSOLID
Insert Position in Deg0.0
Environmental ProtectionHERMETIC
Contact MaterialNICKEL ALLOY SINGLE MATING END SINGLE CONTACT GROUPING
Thread Class2A A
Precious MaterialGOLD AND SILVER
Included Contact TypeROUND PIN SINGLE MATING END SINGLE CONTACT GROUPING
Connector Locking MethodBAYONET PIN
Terminal TypeSOLDER WELL SINGLE MATING END SINGLE CONTACT GROUPING
Terminal LocationBACK SINGLE MATING END SINGLE CONTACT GROUPING
Contact Position Arrangement Style10-35 SINGLE MATING END
Body StyleSTRAIGHT SHAPE, EXTERNAL COUPLING
Mating End Quantity1
Distance From Mounting Shoulder to Front Face1.037 INCHES NOMINAL IN
Thread DirectionRIGHT-HAND
Threaded Device TypeBACK SHELL AND MOUNTING BUSHING
Bushing Accommodation Hole ShapeROUND
Precious Material and LocationCONTACT SURFACES GOLD AND CONTACT SURFACES SILVER
Polarization MethodKEYWAY OR MULTIPLE KEYWAY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
3040-00-239-340618504 INTERCHANGEABLE
Collar,shaft
Komatsu America Corporation
6515-00-321-985065-3173 INTERCHANGEABLE
Curette,chalazion
Sklar Corporation Dba Sklar Instruments
5935-00-528-8443 INTERCHANGEABLE
Dummy Connector,receptacle
5306-01-305-173418504 INTERCHANGEABLE
Bolt,eye
Jergens Inc Div Tooling Components Division
2540-01-359-848218286-18287 INTERCHANGEABLE
Seat,vehicular
Kampi Components Co Inc
4820-01-641-250118504 INTERCHANGEABLE
Valve,check
United States Plastic Corp
5305-01-668-651218504 INTERCHANGEABLE
Screw,feed Regulating
Consolidated Sewing Machine Corp
Cross-Reference Index
Part NumberManufacturer
10-599342-35P Amphenol Corp Div Amphenol Aerospace Operations (USA)
ST5M1291B2 PRIMARY The Boeing Company Div Defense (USA)
18504 Sealtron, Inc. (USA)
S8202H10B35P Enviro-Seal Inc Dba Electronic Seals Co (USA)
10-499492-35P Amphenol Corp Div Amphenol Aerospace Operations (USA)
Related Parts
3040-00-239-3406INTERCHANGEABLE
COLLAR,SHAFT
18504
6515-00-321-9850INTERCHANGEABLE
CURETTE,CHALAZION
65-3173
5935-00-528-8443INTERCHANGEABLE
DUMMY CONNECTOR,RECEPTACLE
5306-01-305-1734INTERCHANGEABLE
BOLT,EYE
18504
2540-01-359-8482INTERCHANGEABLE
SEAT,VEHICULAR
18286-18287
4820-01-641-2501INTERCHANGEABLE
VALVE,CHECK
18504
5305-01-668-6512INTERCHANGEABLE
SCREW,FEED REGULATING
18504

Frequently Asked Questions

What is NSN 5935-00-550-9983?

NSN 5935-00-550-9983 is a Connector,receptacle,electrical, manufactured by The Boeing Company Div Defense, classified under FSC 5935 (No Item Name Available). Status: active.

What are the part numbers for NSN 5935-00-550-9983?

NSN 5935-00-550-9983 has 5 cross-referenced part numbers: 10-599342-35P (Amphenol Corp Div Amphenol Aerospace Operations), ST5M1291B2 (The Boeing Company Div Defense), 18504 (Sealtron, Inc.), S8202H10B35P (Enviro-Seal Inc Dba Electronic Seals Co), 10-499492-35P (Amphenol Corp Div Amphenol Aerospace Operations).

What NSN replaces 5935-00-550-9983?

There are 7 known substitutes for 5935-00-550-9983: 3040-00-239-3406, 6515-00-321-9850, 5935-00-528-8443 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ST5M1291B2?

Key specifications for ST5M1291B2: Overall Diameter: 1.110 INCHES MINIMUM AND 1.120 INCHES MAXIMUM IN; Contact Removability: NONREMOVABLE SINGLE MATING END SINGLE CONTACT GROUPING; Nominal Thread Size: 0.688 INCHES IN; Thread Series Designator: UNEF. 29 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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