Thomas & Betts 18RA-250F T&B 18RA-250F Insulated Vinyl Female - Disconnects For Wire Range 22-18 Length 0.96, Tab Size .250 x .032, Red, 100 Pack

The vinyl insulated 18RA-250F carries a 105 degree C temperature rating and a 600V voltage rating, which covers typical furnace control wiring, blower motor leads and line-voltage appliance circuits. The insulation is also rated UL 94 V-0 for flammability. For temperatures above 105 C you need a nylon or uninsulated barrel terminal instead.

They solve different problems. The Thomas & Betts 18RA-250F is crimped onto a stripped wire end for 22-18 AWG, with a brazed seam serrated barrel and vinyl insulation rated 600V and 105 degrees C. The 3M Scotchlok 951X female T-tap disconnect, also for 22-18 AWG, taps onto a run of wire without cutting it, so you branch off an existing conductor rather than terminate one. Choose the 18RA-250F when the wire end is free to strip and crimp, and a T-tap when the run has to stay continuous.

The Thomas & Betts 18RA-250F is a female 250 series disconnect for 22-18 AWG wire with a .250 x .032 tab opening, so it mates onto a male tab of the same size. For the mating male end, the 3M MVU10-250DMX Scotchlok male disconnect terminal is vinyl insulated and built for the 250 tab size, supplied 100 to a pack. Pairing a female to a male of the same tab width is what makes the joint separable without tools.

T&B lists the ERG4001 as the recommended tool for these. Also approved: WT145C, WT2000, WT112M and ERG4003. Use the insulated-terminal nest matched to the red 22-18 color code. A generic crimper will usually close the barrel, but the brazed seam serrated barrel on this terminal is what delivers its pull-out strength, and that only develops with a proper full-cycle crimp.

The body is brass with an electro tin-plated finish. Tin plating over brass is what gives it a low-resistance connection to a tinned or plated blade and resists surface oxidation in humid mechanical rooms and rooftop units. It is not a marine or direct-wet-location terminal; for those, a heat-shrink sealed barrel is the right choice.

These ship 100 to the inner pack with an order multiple of 100, and 500 to the outer carton. So quantities move in hundreds, not singles. For a service van that generally works out fine: 100 red 22-18 females covers a lot of control-wiring repairs.

The 18RA-250F carries both UL and CSA certifications, the insulation is UL 94 V-0, and it is RoHS compliant under exemption 06. That combination is what most government, healthcare and education submittals ask for on terminal hardware.

The 18RA-250F is a crimp-barrel female: you strip the 22-18 AWG conductor and crimp the terminal onto the wire end. A T-tap type such as the 3M Scotchlok 951X female T-tap disconnect, also rated 22-18 AWG, instead pierces an intact run of wire to branch off it without cutting. Use the crimp barrel for a wire end or a new lead; use the T-tap when you need to pick up power mid-run without breaking the circuit.

The Thomas & Betts 18RA-250F uses insulated vinyl in red with a UL 94 V-0 flammability rating and an electro tin-plated brass body. The 3M Scotchlok 951X female disconnect is nylon insulated and covers the same 22-18 AWG wire range. Vinyl and nylon sleeves differ in stiffness and abrasion behavior, so match whichever your spec or existing harness calls out.

No. The Thomas & Betts 18RA-250F barrel is sized for 22-18 AWG with a maximum insulation diameter of 0.15 inch, and a larger conductor will not seat for a proper crimp. Step up to a disconnect rated for your conductor size in the same .250 x .032 tab series so the connection still mates with the same male tab.

Overall length is 0.96 inch with a 0.29 inch body dimension and 0.03 inch stock thickness. Just under an inch means it seats on a blade without eating much depth behind a thermostat subbase or inside a crowded control compartment, though you still need room for the wire bend radius past the barrel.