Does anyone know what the "usable" length is?

They are designed to be have 2" clear between the head of the bolt and the wire retainer when the retainer is in its natural position. The claims that 2 3/8" are usable should be qualified with warnings that the retainers will be sprung or stretched outward, and perhaps prone to popping open. The intended use is for 2" or less diameter tubing.

does this work as a pin to hold extender in place??

these pins are not meant to have any real force on them

How do you open and close it?

Just pull the bracket end that is open (not attached to the pin) out just far enough to clear the pin and pull it to any side. Put the pin in the item you want and again just pull the bracket out far enough to clear the pin and place the open end of the bracket over the pin. It will spring back to its origiinal shape.

What is the sheer rating for this pin?

There is none since all it is meant to do is to hold the coupler down onto the ball. There is no stress on it.

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CURT 25080 Trailer Coupler Pin, 1/4-Inch Diameter x 2-3/4-Inch Long, Clear ZINC

CURT 25080 Trailer Coupler Pin, 1/4-Inch Diameter x 2-3/4-Inch Long, Clear ZINC

Product ID: 7743581

Details

Brand
CURT
Color
CLEAR ZINC
Material
Carbon Steel
Number of Pieces
1
Size
Pack of 1

📏1/4-inch diameter x 2-3/4-inch length

🛠️Zinc-plated corrosion-resistant finish

🛡️Solid steel for high strength & safety

Description

🔒 Lock in your peace of mind with CURT’s ultimate trailer safety pin!

RUST NOT HERE - Durable zinc plating guards against corrosion, keeping your pin pristine through all weather.
LIFETIME CONFIDENCE - Backed by a limited lifetime warranty, this pin is built to last as long as your adventures.
ROCK SOLID SECURITY - Solid steel pin locks your trailer coupler latch tight, ensuring safe towing every mile.
EFFORTLESS OPERATION - Spring steel retainer clip snaps on easily—no fumbling, no rattling, just smooth security.
UNIVERSAL FIT ZERO HASSLE - Fits a wide range of trailer couplers, jacks, and pintle hooks for ultimate versatility.

The CURT 25080 Trailer Coupler Pin is a 1/4-inch diameter, 2-3/4-inch long solid steel pin with a corrosion-resistant zinc finish. Designed for versatile use across various trailer couplers and towing accessories, it features a spring steel retainer clip for secure, rattle-free locking. Trusted by thousands with a 4.8-star rating and backed by a limited lifetime warranty, it’s the essential, durable safety upgrade every trailer owner needs.

Specifications

ASIN	B001GN3H5A
Best Sellers Rank	#93,463 in Automotive ( See Top 100 in Automotive ) #72 in Trailer Coupler Parts
Brand	CURT
Color	CLEAR ZINC
Compatible Groove Diameter	0.25 Inches
Customer Reviews	4.8 4.8 out of 5 stars (6,974)
Fastener Type	Pin
Global Trade Identification Number	00612314110803
Included Components	1/4" Safety Pin
Item Dimensions	4 x 4 x 1 inches
Item Type Name	Trailer Coupler Pin, 1/4-Inch Diameter x 2-3/4-Inch Long
Item Weight	22.68 g
Manufacturer	Curt Manufacturing
Material Type	Carbon Steel
Model	25080
Number Of Items	1
Number of Pieces	1
Outside Diameter	0.25 Inches
Part Number	25080
Screw Head Style	Square
Size Name	Pack of 1
UPC	612314110803
Unit Count	1.0 Count
Warranty Description	Limited Lifetime

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