M29504 Fiber Optic Termini – M29504/14 and M29504/15


STRAN Technologies has qualified its optical termini to the multimode requirements of MIL-PRF-29504/14 and /15 specifications and is proven to maintain or exceed the performance requirements of STRAN’s M28876 and TACLight connector product lines. Built around a singlemode quality zirconia ferrule, STRAN’s military approved M29504/14 and M29504/15 series multimode optical termini offer singlemode performance at multimode affordability. The ferrule comes chamfered and pre-radiused to minimize polish time and consumption of expensive polishing films. So as to eliminate entrapped air in the bonding adhesive, ferrules are bottom-seated into the ferrule holder for unsurpassed reliability.

With its eleven, specially heat treated Beryllium Copper Belleville washers, the M29504/14 offers consistent terminus mating forces of between 5 – 7lbs. These mating forces have been proven to prevent optical discontinuities during demanding shock loads in excess of 1,500 g’s in 3 milliseconds and vibration levels in excess of 40 g’s RMS. The M29504/14 and M29504/15 are supplied with Fluorosilicone ‘o’-rings for environmental sealing of the connector insert cavity for open face pressures of up to 1 atmosphere. Angle polished and keyed versions are available for singlemode sensor applications; however these versions are not specified in the military specification.

Designed to be used with a 0.0945” hexagonal crimper, specially heat treated and gold flashed crimp sleeves capture Aramid fiber reinforced OFCC strength elements in excess of 22 pounds of tensile load.  These M29504 termini are the contacts designed for both MIL- PRF-28876 and Hermaphroditic TACLight™ connectors.


  • Navy Secure Data/Com Systems
  • Deployable Harsh Environment Systems
  • Emergency Restoration Systems
  • Video / Data Transmission Links
  • Sensor Systems

To access this document, please complete the following:

First Name (required)

Last Name (required)

Email (required)


Features / Options

Termini Pin Multimode (no crimp sleeve)

  • Max Fiber (Diameter in Microns) : 126
  • MIL Spec Number: M29504/14-4131
  • Strantech Part Number: 410-0003-126

Termini Pin Multimode (with crimp sleeve)

  • Max Fiber (Diameter in Microns) : 126
  • MIL Spec Number: M29504/14-4131C
  • Strantech Part Number: 410-0004-126

Termini Socket Multimode (no crimp sleeve)

  • Max Fiber (Diameter in Microns) : 126
  • MIL Spec Number: M29504/15-4171
  • Stran Part Number: 410-0005-126

Termini Socket Multimode (with crimp sleeve)

  • Max Fiber (Diameter in Microns) : 126
  • MIL Spec Number: M29504/15-4171C
  • Stran Part Number: 410-0006-126

Dummy Termini

  • Max Fiber (Diameter in Microns) : N/A
  • MIL Spec Number: M29504/03-4038
  • Stran Part Number: 410-0007

 Termini Mechanical Specifications

  • Connectors incorporating these termini typically meet high impact shock and vibration requirements while maintaining the optical path for error free data transfers.
  • Other ferrule materials can be made available
  • Short travel with extremely high loads, (approximately 5-7 lbs).
  • The zirconia ferrules are held to extreme tolerances (1um TIR).


Title Description
Operating Temperature Range  40°C to +70°C (can go up to 150°C, with high Tg adhesive for bonding the fiber)
Thermal Cycling: -40°C to +65°C
Thermal Shock: -55°C to +85°C
Temperature Life: +110°C for 240 hours
Thermal Shock: 40°C to +70°C per EIA-455-71
Vibration: Up to 40 g’s rms
Mating Durability: 500 cycles with average change of optical transmission of 0.13dB
Salt Spray: 500 hours
Pressure Sealing: 1 atmosphere
Terminus Mating Force:  5 - 7 lbs Typical
Terminus Retention Force:  > 22 lbs 
OFCC Retention Force > 22 lbs (dependent upon OFCC construction)
Weight: 0.7g


Main Menu