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These are standard 3/8" x 16 thread socket head cap screws (we call them bolts) that you see in climbing gyms. Tighten them with a standard 5/16 hex (allen head) or .

These work with standard climbing wall t-nuts. 

Great for indoor use, though if you are in a wet environment or have an outdoor wall we recommend Stainless Steel Bolts and Stainless Steel T-Nuts instead.

Select your sizes and quantity from the dropdown for pricing.

Thread: 1.5" bolts are fully threaded. 2" and up will have an unthreaded neck between the threads and cap head. These neck sizes vary by bolt length. Contact us if you have questions on a specific size.

Need help chosing your sizes? email us at

Other Styles of Bolt: If your holds are tiny footholds with the washer close to the surface you'll need , or if they have no washer and instead have a countersunk attachment point (looks like a martini glass would fit in it) then the bolts have a flat top and are called and we have those as well. 

Standard vs Metric: Standard 3/8" bolts are what we use in the US, Metric M10 bolts and t-nuts are used in the UK and Europe. M10 is slightly larger than 3/8". 3/8" bolts will actually work in M10 t-nuts, but because the Standard 3/8" bolt shaft is a little smaller than a Metric M10 bolt shaft, a Standard bolt in a Metric t-nut is a bit more likely to strip out the threads. Metric M10 bolts DO NOT fit in Standard T-Nuts, or sometimes you can get them in but they'll usually get stuck. It's always recommended to make sure you have the correct hardware that fits together correctly.