Banana Connector: The Family Beyond the Plug
Banana is a family, not one part: plugs, jacks, stacking versions and test leads all share the 4 mm blade.
Quick Answer
| Member | Form | Use |
|---|---|---|
| Banana plug | 4 mm blade, spring contact | Speaker and test connections |
| Banana jack | Receptacle for the plug | Panels, wall plates |
| Stacking plug | Hollow blade, another plugs on | Test benches, multimeters |
| Double banana | Two blades, fixed pitch | Lab instruments |
| Sheathed plug | Insulated barrel | Safety test leads |
Sizes and Ratings
The 4 mm standard
Audio and most test gear use 4 mm. Smaller 2 mm versions exist for dense panels.
Current rating
Quality plugs carry tens of amps; speaker duty is comfortable.
Spring designs
Leaf, split barrel and cage springs grip differently. All work when clean.
Stacking caution
Stacked plugs share one contact path. Keep high current off stacks.
Speaker Versus Test Duty
- Speaker duty: screw or compression plugs, colour keyed.
- Test duty: sheathed, stacking capable plugs.
- Wall plates: banana jacks wired to the cable behind.
- Match metals to avoid corrosion: like on like.
- Retain a pull gauge habit: firm, never forced.
Real-World Applications
- Hifi speaker connections.
- Home theatre wall plates.
- Electronics lab benches.
- PA system patching.
Related Guides
For the plug detail, read banana plugs. For jack panels, see banana jacks. For speaker ends, start with speaker connectors.
FAQ
Are all banana plugs 4 mm?
Audio and test standard is 4 mm; mini versions exist.
Can I stack speaker plugs?
Avoid it. Stacking is for low current test work.
What is a double banana?
Two blades at fixed spacing, common on lab gear.
Do metals matter?
Galloping corrosion aside, gold plated contacts stay stable longest.