My Yahmaha amplifier has flip/squeeze plugs, not the round ones I'm seeing here. Will these work?

I tried it on a flip style and they were too big. The measurement of the plug is 0.15" or 3.85mm at the tip, at the widest 0.20" or 5.3mm. Your flip connectors may be larger than my example, a quick msr of the max gauge wire you can use will answer.

Has anyone tried to solder wires into these connectors for a better connection?

We have personally not done so, but other customers have done so to make their own cables and plugs. So it is quite possible to solder them. Since we have not done so ourselves, I cannot speak on the quality connection, but we have not heard any complaints for those that have. Hope this helps!

Are the outer sleeves/barrel "holding in place" after they're securely tighten? I have similar plugs from other company that "unscrew" themselves

They have not given me any connection problems so far after several months of use, but I went to check them after I saw your question. All the outer sleeves of the plugs inserted into my receiver were loose, a few (not all) going into the wall plates were loose, and none going into any of the speakers were loose. No explanation for how or why this occurred.

Yes you are correct, this is a 4mm Banana plug.

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Description

🎧 Plug into perfection with FosPower’s gold-standard audio connectors!

COLOR CODED CONVENIENCE - Instant polarity identification speeds up installation and prevents errors.
UNIVERSAL COMPATIBILITY - Works seamlessly with 12AWG to 18AWG speaker wires for versatile use.
EFFORTLESS SPEAKER SETUP - Closed screw design ensures a rock-solid connection without wire shorts.
PREMIUM 24 K GOLD PLATING - Resists corrosion for crystal-clear audio and long-lasting performance.
BUILT FOR HOME THEATER PROS - Perfect for A/V receivers, amplifiers, surround sound, and banana wall plates.

FosPower Banana Plugs come in a 12-pair set featuring closed screw terminals with dual screws for secure, short-free connections. Their 24K gold-plated connectors resist corrosion and are color-coded for easy polarity identification. Compatible with 12AWG to 18AWG speaker wires, these plugs are ideal for professional-grade home theater, audio, and amplifier setups.

Specifications

Brand	FosPower
Connector Type	USB
Cable Type	Speaker
Compatible Devices	Speaker
Special Feature	24k gold plated
Recommended Uses For Product	For use with speakers, A/V receivers, amplifiers, surround sound systems, and banana wall plates that use banana style binding posts
Colour	Black
Connector Gender	Male-to-Male
Shape	Round
Number of Pins	1
Net Quantity	12.00 Count
Item Weight	7.5 Ounces
Model Name	FosPower Banana Plugs
Indoor/Outdoor Usage	Outdoor
Number of Items	1
Outer Material	Metal
Manufacturer	FosPower
Country of Origin	USA
Model number	FOSCBL-2313
Item Weight	212 g
Product Dimensions	18.8 x 14.99 x 1.02 cm; 212.62 g
Item model number	FOSCBL-2313
Item Height	0.4 Inches
Item Width	5.9 Inches
Number of Ports/Connectors	1
Connectivity Technology	USB
Are batteries included?	No
External Certification	Não aplicável

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