PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ST5M1291-B3Connector,receptacle,electrical

The Boeing Company Div Defense · NSN 5935-01-149-5144 · FSC 5935 · No Item Name Available
Verified by PartsTable
NSN 5935-01-149-5144 — this item is cataloged by the U.S. Government under National Stock Number 5935-01-149-5144. Primary manufacturer part number: ST5M1291-B3.
Features
  • Connector,receptacle,electrical — FSC 5935
  • Thread Direction: RIGHT-HAND
  • Thread Class: 2A A
  • Overall Diameter: 1.110 INCHES NOMINAL IN
  • Contact Position Arrangement Style: 7-50 SINGLE MATING END
  • Mounting Facility Thickness: 0.360 INCHES NOMINAL IN
  • Mating End Quantity: 1
  • Environmental Protection: HERMETIC
Applications
  • Electrical interconnection
  • Signal interface mating
  • Quick-disconnect coupling
General Description

The Connector,receptacle,electrical, cataloged under National Stock Number 5935-01-149-5144, 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 6 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5935-01-149-5144
Primary Part NumberST5M1291-B3
Item NameConnector,receptacle,electrical
FSC / FSG5935 / 59 — No Item Name Available
ManufacturerThe Boeing Company Div Defense
StatusACTIVE
Thread DirectionRIGHT-HAND
Thread Class2A A
Overall Diameter1.110 INCHES NOMINAL IN
Contact Position Arrangement Style7-50 SINGLE MATING END
Mounting Facility Thickness0.360 INCHES NOMINAL IN
Mating End Quantity1
Environmental ProtectionHERMETIC
Threaded Device TypeBACK SHELL AND MOUNTING BUSHING
Distance From Mounting Shoulder to Front Face1.037 INCHES NOMINAL IN
Contact MaterialCOPPER ALLOY SINGLE MATING END SINGLE CONTACT GROUPING
Connector Locking MethodBAYONET PIN
Contact Surface TreatmentGOLD SINGLE MATING END SINGLE CONTACT GROUPING
Included Contact Quantity7 SINGLE MATING END SINGLE CONTACT GROUPING
Shell Surface TreatmentPASSIVATE
Contact Surface Treatment Document and ClassificationMIL-G-45204 MIL SPEC SINGLE TREATMENT RESPONSE SINGLE MATING END SINGLE CONTACT GROUPING
Terminal TypeSOLDER WELL SINGLE MATING END SINGLE CONTACT GROUPING
Terminal LocationBACK SINGLE MATING END SINGLE CONTACT GROUPING
Included Contact TypeROUND PIN SINGLE MATING END SINGLE CONTACT GROUPING
Polarization MethodKEYWAY OR MULTIPLE KEYWAY
Precious Material and LocationCONTACT SURFACES GOLD
Insert Position in Deg0.0
Thread Series DesignatorUNEF
Nominal Thread Size0.688 INCHES AND 0.875 INCHES IN
Bushing Accommodation Hole ShapeROUND
Thread Quantity Per Inch24 AND 20
Precious MaterialGOLD
Shell MaterialSTEEL CORROSION RESISTING
Precious Material and Weight0.007 GOLD GRAINS, TROY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
2540-00-119-0645 INTERCHANGEABLE
Seat,spring
3110-00-120-3108 INTERCHANGEABLE
Bearing,roller,needle
5330-00-599-487018505 INTERCHANGEABLE
Gasket
Parker-Hannifin Corporation
4730-01-507-2464 INTERCHANGEABLE
Elbow,pipe
Cross-Reference Index
Part NumberManufacturer
10-599342-99P Amphenol Corp Div Amphenol Aerospace Operations (USA)
18505 Sealtron, Inc. (USA)
10-499492-99P Amphenol Corp Div Amphenol Aerospace Operations (USA)
S8202H10B99P-1L4 Enviro-Seal Inc Dba Electronic Seals Co (USA)
ST5M1291-B3 PRIMARY The Boeing Company Div Defense (USA)
S8202H10B99P Enviro-Seal Inc Dba Electronic Seals Co (USA)
Related Parts
2540-00-119-0645INTERCHANGEABLE
SEAT,SPRING
3110-00-120-3108INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
5330-00-599-4870INTERCHANGEABLE
GASKET
18505
4730-01-507-2464INTERCHANGEABLE
ELBOW,PIPE

Frequently Asked Questions

What is NSN 5935-01-149-5144?

NSN 5935-01-149-5144 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 5935-01-149-5144?

NSN 5935-01-149-5144 has 6 cross-referenced part numbers: 10-599342-99P (Amphenol Corp Div Amphenol Aerospace Operations), 18505 (Sealtron, Inc.), 10-499492-99P (Amphenol Corp Div Amphenol Aerospace Operations), S8202H10B99P-1L4 (Enviro-Seal Inc Dba Electronic Seals Co), ST5M1291-B3 (The Boeing Company Div Defense) and 1 more.

What NSN replaces 5935-01-149-5144?

There are 4 known substitutes for 5935-01-149-5144: 2540-00-119-0645, 3110-00-120-3108, 5330-00-599-4870 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of ST5M1291-B3?

Key specifications for ST5M1291-B3: Thread Direction: RIGHT-HAND; Thread Class: 2A A; Overall Diameter: 1.110 INCHES NOMINAL IN; Contact Position Arrangement Style: 7-50 SINGLE MATING END. 30 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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