Sta-Kon RBBT21 INSULATED TEFZEL BUTT SPLICE 16-14

The RBBT21 is a blue-coded butt splice sized for 16 to 14 AWG stranded copper conductors. Blue is the standard color code for the 16-14 AWG range across insulated terminal lines, so it is easy to identify in a bin or on a crimp chart. Both barrel ends take the same range, so you are splicing 16-14 to 16-14, not stepping between sizes.

Yes. The RBBT21 uses a fluoropolymer (Tefzel) insulation rated to 150 C, which is well above the 105 C ceiling on ordinary nylon or vinyl insulated splices. That makes it suitable for engine compartments, boiler rooms, rooftop equipment, and similar elevated ambient work. It is also rated 600 V, so it covers standard building branch circuits and control wiring.

The RBBT21 carries UL file E9809. Paired with the 600 V rating, that covers it for the general purpose and control wiring an MRO or maintenance electrician runs day to day, and gives a facility inspector a file number to reference.

The working difference is heat and chemical exposure. The RBBT21's fluoropolymer barrel insulation holds a 150 C rating, so it survives ambient and radiant heat that softens or shrinks a standard nylon or vinyl splice. Electrically both do the same job at 600 V on 16-14 AWG copper. If the splice sits in conditioned space at normal room temperature, a standard nylon splice is the cheaper answer; if it sits near a heat source, specify the Tefzel version.

It is a crimped barrel splice, so it needs a controlled-cycle terminal crimper set for the blue 16-14 AWG die position, not pliers. Crimp each end separately after the conductor is bottomed in the barrel. The insulation on this one is fluoropolymer rather than nylon, so it will not tear the way soft vinyl does under the die, but the tool and die size are the same as any insulated 16-14 butt splice.

No. The RBBT21 barrel is copper and is sized for 16-14 AWG copper conductors. Aluminum needs a connector specifically listed for aluminum or AL/CU service. Using a copper-only splice on aluminum risks a loose, corroding joint.

Country of origin on the RBBT21 butt splice is the United States. That matters for government, federal facility, and Buy American procurement work where domestic origin has to be documented on the submittal.

Order by MPN RBBT21 from Sta-Kon. It is a single model with no finish, length, or packaging variations to pick between, so a facility standardizing on one heat-rated 16-14 AWG splice has exactly one number to put on the stock list.