Long A325 Bolt Alternatives

[waytsh]

Hi All,

I have designed a reinforcing solution for a barn timber using bolted steel side plates. The contractor is having trouble sourcing the long A325 bolts required. I can't really use lags bolts, at least on the backside of the timber because of clearance with the roof. Is there a good alterative that might be a little more readily available? Could I use cut down threaded rod or maybe F1554 Grade 55 anchor bolts? I figure you clever folk will have some ideas.

Thanks!

 

[DrZoidberWoop]

F1554 Gr105 rods have strength that's roughly equivalent to A325 bolts. We commonly spec it when the required bolts are not available.

 

[Harbringer80]

Do you really need A325? Can they use A307 threaded rod? Otherwise, they can use F1554 Gr 55.

 

[waytsh]

Do you really need A325? Can they use A307 threaded rod? Otherwise, they can use F1554 Gr 55.

I might be able to squeak by with A307s in some areas. If I can't I can look at increasing the number of bolts.

 

[XR250]

Hard to imagine the bolt grade would be the limiting factor.

 

[dik]

F1554 Gr105 rods have strength that's roughly equivalent to A325 bolts.

Good call... I generally spec Grade 55 S1 for anchor rods... not as strong but better than A307.

 

[phamENG]

Hard to imagine the bolt grade would be the limiting factor.

This. There's a reason A325 is rarely spec'd in wood construction. In nearly every connection I've ever considered in wood, the wood failed a check long before the bolt did. If you're finding that you need a bolt stronger than A307, look real close at your calcs around the wood failure mode.

 

[canwesteng]

I'm curious to see the detail as well. Seems like even for a through bolt with side plates plowing through the wood would always govern.

 

[Lomarandil]

High spec threaded rod is great and all, but given the same thought as above, you might want to think about coil rod. Ubiquitous and versatile.

 

[waytsh]

Hard to imagine the bolt grade would be the limiting factor.

Fair point, I will double check my numbers. They are in white oak with a very large edge distance.

 

[mikek396]

What about SAE Grade 5 bolts?
I believe strength is similar and they can be purchased from McMaster

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