Are these o.k. for 13awg wire?

if you look in the description you'll see ( WORKS WITH MULTIPLE SIZES OF SPEAKER WIRE Compatible with 12AWG to 18AWG speaker wire ) so i think so

They are standard size plugs. You will struggle to attach larger gauge cable. As the retaining screws have to be tighten all the way in .

Are these plugs meant to be very tight fitting? I assumed this was the standard size and it's the first time I've connected speakers this way.

do you mean the cover over the screws in the connector or the plug into its socket? i found the cover rather tight, and you have to make suree the sdcrews are tight in; if you do, then the cover fits nicely. That's the trick, but it took me a couple of gos to realise. In terms of fitting into the socket, they seem normal to me. Hope that helps.

Can the supplier or manufacturer clarify the size of these banana plugs. Are these standard banana plugs that fit into 4mm sockets or not??

I'm not the manufacturer, just a user but I can say these plugs were a perfect fit in the terminals of both my speakers and my amplifier.

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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

Product ID: 50068384

Details

Brand
FosPower
Cable type
Speaker
Compatible devices
Amplifier
Connector type
Banana Plug
Special feature
24k gold

🔆24K gold plated corrosion resistance

🔧Dual screw secure fit

🎚️Supports 12-18 AWG speaker wire

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Description

🎧 Plug into perfection — sound that speaks success.

EFFORTLESS SETUP - Dual screws lock wires tight for a no-fuss, rock-solid connection every time.
LIFETIME CONFIDENCE - Backed by a limited lifetime warranty—because quality that lasts is non-negotiable.
PREMIUM GOLD PLATING - 24K gold connectors ensure pristine signal clarity and long-lasting corrosion resistance.
COLOR CODED PRECISION - Polarity-coded collars eliminate guesswork, so your sound system always stays perfectly balanced.
UNIVERSAL COMPATIBILITY - Fits a wide range of speaker wires from 12 to 18 AWG—perfect for any home theater setup.

FosPower Banana Plugs come in a set of 4 closed screw connectors, featuring 24K gold plating for superior corrosion resistance and signal integrity. Designed for easy installation with dual screws securing 12-18 AWG speaker wires, these plugs are color-coded for polarity and ideal for home theater, amplifiers, and audio/video receivers. Trusted by thousands with a 4.4-star rating and backed by a limited lifetime warranty, they deliver professional-grade audio connectivity that elevates your sound experience.

Specifications

ASIN	B06Y6CQCX1
Best Sellers Rank	6 in Audio & Video Adapters
Brand	FosPower
Cable Type	Speaker
Colour	Closed Screw
Compatible Devices	Amplifier, Speaker, Television
Compatible Phone Models	Probably compatible with smartphones, specific models not listed
Connector Gender	Male-to-Female
Connector Type	Banana Plug
Country Of Origin	China
Customer Package Type	FFP
Customer Reviews	4.4 4.4 out of 5 stars (4,780)
Ethernet Cable Category	Cat 5
Gauge	18.0
Indoor Outdoor Usage	Indoor
Item Shape	Rectangular Prism
Item Weight	1.2 Ounces
Manufacturer	Fospower
Manufacturer Part Number	FOSCBL-2312
Maximum Voltage	20 Volts
Model Name	Closed Banana Plugs for Speaker Wire, Gold Plated Connectors with Dual Screws
Model Number	FOSCBL-2312
Number of Items	4
Number of Pins	1
Other Special Features of the Product	24k gold plated
Outer Material	Metal, possibly zinc alloy
Recommended Uses For Product	Home Theater, Audio Systems, Speaker Installations
Specification Met	RoHS
UPC	813154023128
Unit Count	4.0 count

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