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F1554 vs A307 Anchor Bolts

F1554 vs A307 Anchor Bolts

F1554 vs A307 Anchor Bolts

(OP)
I have searched the forums and could not find a very straight forward answer.  We had designed for a 7/8" A307 anchor bolt and our customer wants to use an 3/4" F1554 bolt.  In searching for the answer I would think the answer is no, they would need to be the same size because they are just about the same strenght.  Is this a correct assumption?

Thanks.

RE: F1554 vs A307 Anchor Bolts

Are you talking about ASTM A 307 Grade C and ASTM F 1554 Grade 36?

Regards,

Cory

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RE: F1554 vs A307 Anchor Bolts

(OP)
Thats what I believe, but the only designation I have is A307 and F1554.

RE: F1554 vs A307 Anchor Bolts

The information you have is inadequate.  If you are talking Grade C and Grade 36, they are essentially identical.  Note - ASTM A 307 Grade C is superceded by F 1554, so there really is no reason to specify A 307 Grade C on a new design.

Regards,

Cory

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RE: F1554 vs A307 Anchor Bolts

(OP)
That is what I had figured.  Thanks for the answers.

RE: F1554 vs A307 Anchor Bolts

If elongation of the bolt is important, remember the size is what counts, not the material strength.

RE: F1554 vs A307 Anchor Bolts


elongation of the bolt is always  important. If there is no elongation, there is no clamp load and thus the joint remains loose.  

Ciao,

HevïGuy
www.heviitech.com

RE: F1554 vs A307 Anchor Bolts

HeviiGuy,

"Always" is a very strong word.  There are instances where clamping force is not an issue.  Take the case of sign posts with nuts above and below the base plate.  Elongation would affect deflection, but would not loosen the joint.

RE: F1554 vs A307 Anchor Bolts


Foregoing resistance to shear loading, the basic function of any threaded fastener is to develp a clamp load. Preloaded threaded fasteners act as stretched springs. Their normal tendency is to return to their unloaded length. This is the mechanism behind clamp load.

Even if clamp load "isn't an issue", when a nut is run down the inclined plane of the fastener's thread, and friction constituents of the joint are overcome, the fastener does indeed stretch (hence "elongation") -even in the aforementioned sign post example where the grip length is relatively miniscule.

Ciao,

HevïGuy
www.heviitech.com

RE: F1554 vs A307 Anchor Bolts

Thanks for the lecture, but there are occasions in structures when we want the bolts to slip, and a clamping force is counterproductive.  Sometimes we intall them snug tight and then back off.

RE: F1554 vs A307 Anchor Bolts


Interesting. Why not simply use a dowel  if it's okay for the bolt to remain loose?

Ciao,

HevïGuy
www.heviitech.com

RE: F1554 vs A307 Anchor Bolts

Because you want it to stay in the hole.  One example is the connection of a wind column at the end of a portal frame building to the end portal at roof level.  You want the wind column to resist horizontal load only, so you allow the portal rafter to deflect by using slotted holes and bolts that are not tightened.  Horses for courses.  I am all for tight bolts, but my point was that "always" is not correct.

RE: F1554 vs A307 Anchor Bolts

F1554 is good material.  It comes in three grades; 36, 55 and 105.  I would want the same diameter rod as the original design, but thqat is negotiable if they are asking to substitute grade 55 material.  Good Luck.

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