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

FosPower Banana Plugs 2 Pairs, 4 pcs, Closed Screw 24K Gold Plated Banana Speaker Plug Connectors for Speaker Wire, Wall Plate, Home Theater, Audio,Video Receiver, Amplifiers and Sound Systems

FosPower Banana Plugs 2 Pairs, 4 pcs, Closed Screw 24K Gold Plated Banana Speaker Plug Connectors for Speaker Wire, Wall Plate, Home Theater, Audio,Video Receiver, Amplifiers and Sound Systems

Q: 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.

Q: 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!

Q: 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.

Product ID: 249592951

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Details

Brand
FosPower
Connector Type
Closed Screw
Cable Type
Speaker
Compatible Devices
Speaker
Special Feature
Gold plated

🔆24K gold plated corrosion resistance

🔧Dual screw secure fit

🎛️Supports 12-18 AWG speaker wire

Frequently Bought Together

FosPower Banana Plugs 2 Pairs / 4 pcs, Closed Screw 24K Gold Plated Banana Speaker Plug Connectors for Speaker Wire, Wall Plate, Home Theater, Audio/Video Receiver, Amplifiers and Sound Systems

Amazon Basics Speaker Cable, Easy Assembly, 16-Gauge, Bronze, 100 ft

YAMAHA RX-V385 5.1-Channel 4K Ultra HD AV Receiver with Bluetooth

Description

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

EFFORTLESS SETUP - Closed screw design ensures a rock-solid, no-slip connection every time.
COLOR CODED PRECISION - Polarity-coded collars eliminate guesswork and keep your sound system perfectly balanced.
PREMIUM SIGNAL CLARITY - 24K gold plating resists corrosion for pristine audio transmission.
UNIVERSAL COMPATIBILITY - Fits a wide range of speaker wires from 12 to 18 AWG—flexibility meets performance.
BUILT FOR HOME THEATER PROS - Ideal for amplifiers, surround sound, and wall plates—upgrade your audio game instantly.

FosPower Banana Plugs feature a closed screw design with dual screws for secure wire connections, 24K gold plating to prevent corrosion, and compatibility with 12-18 AWG speaker wires. Perfect for home theater, audio, and amplifier setups, these color-coded plugs simplify installation while delivering superior sound quality.

Specifications

Brand	FosPower
Connector Type	Closed Screw
Cable Type	Speaker
Compatible Devices	Speaker
Special Feature	Gold plated
Recommended Uses For Product	Home Theater, Audio Systems, Speaker Installations
Colour	06 FT
Connector Gender	Male-to-Male
Shape	Round
Number of Pins	4
Net Quantity	4.00 Count
Model Name	Closed Banana Plugs for Speaker Wire, Gold Plated Connectors with Dual Screws
Indoor/Outdoor Usage	Outdoor
Number of Items	1
Customer Package Type	FFP
Outer Material	Metal, possibly zinc alloy
Manufacturer	FosPower
Country of Origin	USA
Model number	FOSCBL-2312
Item Weight	30 g
Product Dimensions	9.65 x 7.62 x 0.76 cm; 30 g
Item model number	FOSCBL-2312
Item Height	0.3 Inches
Item Width	3 Inches
Display Size	6 Inches
Connectivity Technology	USB
Are batteries included?	No

Have a Question? See What Others Asked

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

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

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

is this a 4mm plug?

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