If I want to countersink these so the are flush on the back, what size drill bit should I use?

I'm not sure what size drill bit you would use, but I don't think you'd want to do that because it would thin the wood that you're anchoring them in. Also, they are installed behind the wall so they aren't going to catch on anything and don't need to be flush.

I used a 1/2" drill bit to drill my holes in 3/4" plywood. Will these T nuts work for it.

Yeah 7/16" to 1/2" works for a hole size.

what is the length of the threaded part?

7/16"... if your question is intended to determine minimum plywood thickness, I would strongly suggest 3/4".

Can you recommend bolts that fit in these t-nuts?

Hi! The bolt that fits this tnut are 3/8" diameter. I have included a link to our website that give you a variety of lengths and finishes. http://www.cheapholds.com/Bolts_s/1818.htmPlease let me know if you have any more questions!

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SLSWHLX250 T-nuts for Climbing Holds

Product ID: 330969052

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🔩7/16" hole

⚙️Square drive

🧗‍♂️250 pack

Description

🔧 Secure Your Climb with Style!

BUILT TO LAST - Constructed from high-quality zinc-plated steel, ensuring longevity and resistance to wear.
EASY INSTALLATION - Designed for a 7/16" diameter hole, making setup a breeze for any climbing enthusiast.
ELEVATE YOUR CLIMBING GAME - Transform your climbing wall with premium T-nuts designed for durability and performance.
VERSATILE FOR ALL CLIMBERS - Perfect for both indoor and outdoor climbing walls, catering to every adventure seeker.
JOIN THE CLIMBING COMMUNITY - With 250 T-nuts in a pack, you can create a climbing wall that brings friends together.

The dzotmyn250 T-nuts are premium climbing wall accessories designed for both indoor and outdoor use. Each pack contains 250 high-quality, zinc-plated steel T-nuts that fit a 7/16" diameter hole, featuring a square drive system for easy installation. Perfect for creating a durable and engaging climbing experience.

Specifications

Drive system	Square
Material type	steel
Batteries included?	No
Brand	Climbing Wall Supply
Manufacturer	Escape Climbing
Item model number	FBA_HD24-250
Package Dimensions	22.99 x 16 x 7.24 cm; 2.02 kg
ASIN	B008L2Z630

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