Product Overview
Solderless Speaker and Test Lead Connectors with Finger Guards
Condition
Unused new old stock. Includes one red plug and one black plug with finger guard collars. Markings legible: RadioShack 274-721, reverse marked 274-0721.
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Product Overview
Radio Shack catalog number 274-721 (also designated 274-0721) provides a solderless termination solution for audio connections, DC power supplies, and test bench gear. Each set includes one red and one black banana plug with color-coded handles and integrated finger guards. Internal clamping secures stranded wire by folding conductors over the plug body and tightening the threaded metal collar, eliminating the need for soldering or crimping tools in the field.
Key Features
- Standard 4mm banana plug pins compatible with standard binding posts and test jacks
- Solderless clamping mechanism secures stranded wire under a threaded metal collar
- Integrated finger guard collars on insulated red and black handles
- Two-plug set with one red handle and one black handle for polarity identification
- Knurled metal collar provides positive grip during assembly and wire installation
Applications
- Terminating amplifier speaker cables for quick connection to stereo receiver binding posts
- Building custom DC power supply jumper cables and test leads on the workbench
- Hooking up amateur radio gear, signal generators, and bench multimeters
- Prototyping audio crossover networks and educational electronics projects
Frequently Asked Questions
How do you attach wire to these solderless banana plugs?
Unscrew the plastic handle and the internal metal collar. Thread the stripped stranded wire through the handle and center plug hole, fold the bare wire strands over the side, and thread the metal collar down over the folded wire to clamp it tightly. Then screw the handle back into place.
What wire gauge works best with the solderless clamp?
Stranded copper wire between 16 AWG and 22 AWG fits through the internal wire channel and folds cleanly over the plug body for a secure mechanical clamp.
What binding post spacing do these plugs fit?
These are individual single plugs, allowing connection to standard 4mm binding posts at any spacing, including standard 3/4-inch dual post configurations or isolated jacks.
Nothing quite matches the satisfaction of building a clean test lead without firing up a soldering iron. Strip the wire, cinch down the collar, and get straight to testing.
