How Heavy of a load are these for when hauling ?

You can tell me where to use, I can tell you if it can be used.The safety pin is made of solid steel and can be used in many heavy machinery without problems. The other 1/4 pins are only 6MM, ours is 6.3MM, this is the standard 1/4 pin。 If you encounter any problems during use, please contact us, we'll do our absolute best for you to put things right.

Your description of this product says it is a square shaft but every photo you have shows a round shaft? Which is this please?

We usually say that the square shaft locking pin is a pin that can be used on a square shaft or a square tube. The spring wire of the square pin is square, so you can put it on the square tube and insert the pin into the pin hole of the square tube. Since most pinholes are round, we make the needle round. This square pin is also suitable for cylindrical pins. If the pinhole is square, it can be used as long as the size is comparable. hoping it is helpful to you. Thank you for your question.

Does this work with scaffolding?

Probably too light duty... I don't believe they would be strong enough for scaffolding application

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10 PCS Square Pto Pin Shaft Locking Pin 1/4 pin Hitch pin Wire Lock Pin Safety Coupler Pin 1/4" x 2-3/4"for PTO,Farm,Lawn,Hitches,and Garden (10 PCS Trailer Pins)

10 PCS Square Pto Pin Shaft Locking Pin 1/4 pin Hitch pin Wire Lock Pin Safety Coupler Pin 1/4" x 2-3/4"for PTO,Farm,Lawn,Hitches,and Garden (10 PCS Trailer Pins)

Product ID: 149323353

Details

Brand
Comonc
Item Diameter
6.3
Material
Carbon Steel
Pin type
Hitch
Size
1/4-01

📏1/4 inch diameter precision fit

⚙️Zinc-coated corrosion resistance

🛡️High-strength carbon & spring steel

158 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔒 Lock in strength, unlock peace of mind!

VERSATILE UTILITY - Perfect for farming, gardening, trailers, boats, and more—your all-in-one locking pin solution.
LOCK IT DOWN SECURELY - Integrated safety latch ensures pins stay firmly in place—no accidental pops or loosening.
WEATHERPROOF RELIABILITY - Zinc plating offers superior corrosion resistance, keeping your pins rust-free season after season.
PRECISION FIT EVERY TIME - Standard 1/4" x 2-3/4" size fits a wide range of trailer and PTO connectors seamlessly.
BUILT TO ENDURE HEAVY LOADS - Crafted from premium carbon and spring steel for unmatched strength and durability under pressure.

This 10-piece set of 1/4" x 2-3/4" square PTO shaft locking pins combines precision engineering with rugged carbon steel and spring steel construction. Featuring a secure safety latch and zinc corrosion-resistant coating, these pins deliver reliable, heavy-duty performance across farming, gardening, trailer, and PTO applications—ensuring your equipment stays locked tight and ready for action.

Specifications

ASIN	B07VF61LB1
Best Sellers Rank	#9,222 in Automotive ( See Top 100 in Automotive ) #139 in Trailer Accessories
Brand	Comonc
Color	silver
Compatible Groove Diameter	0.25 inches
Customer Reviews	4.8 4.8 out of 5 stars (1,705)
Fastener Type	Locking Pin
Finish Types	Zinc plated
Item Diameter	6.3 millimeters
Item Dimensions	2.75 x 0.25 x 2 inches
Manufacturer	Comonc
Material Type	Carbon Steel
Model	10 PCS Trailer Pins
Number Of Items	10
Number of Pieces	10
Outside Diameter	6.3 millimeters
Part Number	SLP-1/4
Pin Type	Hitch
Set Name	10
Size Name	1/4-01
UPC	791319276476
Unit Count	10 Count

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