What is the diameter of the hole for the lock shackle?

The hole is 7/16" (not 1/2" like the other answer says). Would have been nice if the manufacturer had listed this in the description.

Is the body aluminum? How secure can that be?

Blaylock Trailer (TL-33) Lock. The EZ Lock Model TL-33 Universal Coupler Lock is precision made of heavy grade aircraft aluminum and will not rust. It features a solid hardened 3/4" steel locking rod, for use with large heavy duty padlock (padlock not included). Fits all trigger style: Fulton, Shelby, Dutton-Lainson, Atwood, and similar. Fits latch style: Atwood, Fulton cast couplers and similar. Does not fit Hammeblow (Bulldog) couplers. Inside dimension of the channel is 4-3/4 inches with overall dimensions of 4-1/2" depth x 6-1/8" wide x 5-1/2" tall. A patented design ensures the most secure way to leave an unattended trailer.

What if I only need a pin

Make one out of a grade 8 bolt the length you need to be able install a lock. Have a hole drilled in the end of the bolt slightly larger than the lock used

Would a 5/8" locking hitch pin work with this security device?

Not sure why anyone would want to attempt that. I would suggest ordering it - then take the rod from it to a locksmith you trust and get a good padlock for it. If you want things Keyes the same so you don’t look like a high-school janitor - locksmiths can customize locks and match key gateway systems. If you get a cheap lock from a big box store - think through the “weakest link” theory and scrap the idea of buying this item.

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Blaylock American Metal TL-33 Coupler Lock

Blaylock American Metal TL-33 Coupler Lock

Product ID: 8321879

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Details

Brand
Blaylock
Item Weight
3 Pounds
Vehicle Service Type
Trailer
Material
Aluminum Alloy
Finish Type
Powder Coated

🔒Universal fit

⚙️3 pin placement

🇺🇸USA made

Description

🔐 Lock It Down, Drive It Proud!

🌟 TRUSTED BRAND - Manufactured by Blaylock American Metal, a name synonymous with reliability and quality.
📏 ADJUSTABLE FIT - Accommodates couplers from 2" to 2-5/16", providing a snug and secure fit every time.
🔑 SECURE YOUR TRAILER - Designed for both commercial and recreational use, ensuring peace of mind wherever you go.
💪 DURABLE CONSTRUCTION - Crafted from high-quality aluminum and alloy steel with a powder-coated finish for long-lasting performance.
🔄 VERSATILE COMPATIBILITY - Fits over 30 different coupler styles and brands, making it the ultimate choice for diverse needs.

The Blaylock TL-33 Universal Coupler Receiver Lock is a robust and versatile locking solution designed for both commercial and recreational trailers. Weighing just 3 pounds, this lock fits over 30 different coupler styles and accommodates couplers ranging from 2" to 2-5/16". Made from durable aluminum and alloy steel with a powder-coated finish, it ensures long-lasting protection for your trailer. Proudly made in the USA, the TL-33 is the go-to choice for secure and reliable trailer locking.

Specifications

Brand	Blaylock
Item Weight	3 Pounds
Vehicle Service Type	Trailer
Material	Aluminum, Alloy Steel, Metal
Finish Type	Powder Coated
OEM Part Number	TL33
Manufacturer	Blaylock American Metal
UPC	749560112333
Global Trade Identification Number	00749560112333
Model	TL-33
Item Weight	3 pounds
Country of Origin	USA
Item model number	TL-33
Is Discontinued By Manufacturer	No
Exterior	Smooth
Manufacturer Part Number	TL-33

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