• There are no alternate images available for this product.


3-conductor 1/4" Long Frame Jack, WEco Equiv. 248A, Max. Diameter "x" 0.625" (15.9mm)

Out of stock
This item is special order

Buy Now

View More From This Family

Long frame jacks are designed especially for high quality communication equipment, and to meet exacting MIL specifications, as well as telephone and communication systems. Rugged steel frames are produced in specially designed dies, press welded to provide rigidity and dimensional stability required by telephone and communication jack panels - and to meet MIL frame strength tests. A and C frame styles are available. MT-Jax have solder lug terminals.

A single row of jacks can be installed with a single buss wire connected to all ground lugs in a row, or when double rows are mounted on .625" vertical centers with lugs oriented between rows, holes in ground lugs line up so a single buss wire provides connections for both rows.

MT-Jax jacks Numbers MT-342B and MT-344B have shorter bushings, 0.5" long with a hold inside diameter of .21". They will mate with MIL plug M642/5-1 or M642/8-1. M642/5-1 plug (Switchcraft 480) cannot be used with MT-342B or MT-344B if these jacks are mounted on standard .625" thick panels. The short jack bushings are recessed .125", and the M642/5-1 is too wide to fit in the panel recess. Use plug M642/8-1 (Switchcraft 484) with a narrower diameter to fit in the recess and mate properly.

Contacts on shunts and isolated switching circuits are welded crossbar palladium. Welded crossbar gold alloy contacts (WEco #1) are available on special order for dry circuit applications


  • Number of Conductors: 3
  • Mounting Type: Panel
  • Termination Style: Solder
  • Contact Plating: Palladium
  • Sealed: Not Sealed
  • Packaging Type: Bulk
  • Number of Stations: 1
  • Standard Connector Type: MIL-Type Jacks & Plugs
  • Shunt: Shunted
  • Jack-Plug Type: Jack
  • Special Feature: Smaller ID


  • Contact Resistance: 0.03 Ohms
  • Dielectric Withstanding Voltage: 500 Volts
  • Insulation Resistance: 10000 MOhms
  • Circuit-Schematic: Double Closed


  • Life Cycle: 10000 Cycles


  • Temperature Range: -55C to +85C
  • Humidity Rating: MIL-STD-202 Method 106
  • Salt Spray: MIL-STD-202 Method 101
  • Mechanical Shock: MIL-STD-202 Method 213 Test Cond H
  • Vibration: MIL-STD-202 Method 213
  • Minimum Temperature: -55 C
  • Maxiumum Temperature: 85 C


  • RoHS Compliant: Compliant
  • REACH Compliant: Compliant
  • Brand: Switchcraft


  • Body Material: Copper Alloy
  • Contact Material: Gold Alloy
  • Insert Material Type: Thermoplastic
  • Terminal Material: Copper Alloy Tinnned
  • Spring Material: Palladium
  • Frame Material: Steel