×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

A307 Heavy Hex Head

A307 Heavy Hex Head

A307 Heavy Hex Head

(OP)
I work for a firm that always specs A307 as heavy hex head bolts.  These are for items like stairs and handrails.  Before coming here I had always just specified A307 Gr A for such things which by default comes as standard hex.

I have a few questions.

Is specifying A307 heavy hex in structures a common practice?

What is the extra cost? (I already contacted a vendor. He was no help.)

Why would you want a heavy hex head to bolt a stair tread to stringer (as an example) anyway?

RE: A307 Heavy Hex Head

Somebody correct me if I'm wrong, but I believe it simply depends on what type of bolt or threaded rod you're using.  High-strength and/or large diameter bolts/rods will typically require heavy nuts.  It would be overkill for lower strength bolt/rod applications.  

Not sure about the extra cost, but I'm sure you'd have to take other factors into account such as galvanizing, dimension of nut considered, etc.

RE: A307 Heavy Hex Head

might just be specifying practice to avoid confusion or winding up with the wrong spec for A325 bolts or A490.  

RE: A307 Heavy Hex Head

A307 Heavy Hex Bolt is specified as A307 Grade B.

Depending on size, say 1/4" to 1 1/2", A307 Gr A Bolts use a Standard A563 Hex Nut. From 1 5/8" up, A307 Gr A Bolts use a A563 Heavy Hex Nut.

All A307 Gr B Bolts are Heavy Hex Bolts and require A563 Heavy Hex Nuts for all sizes.

I don't think I answered any of your questions but I am sure I confused the hell out of the topic !!!!  

RE: A307 Heavy Hex Head

I stipulate heavy hex in general for all bolts and in particular for anchor rods...

Dik

RE: A307 Heavy Hex Head

In Canada, 5/8" ASTM A307 bolts with standard hex head are commonly used for light steel framing such as girts, purlins, etc.  For structural steel in buildings, 3/4" ASTM A325 bolts are usually used.

The following link suggests where A307 Heavy Hex Head are used:

http://www.portlandbolt.com/technicalinformation/astm/ASTM_A307.html

BA

RE: A307 Heavy Hex Head

(OP)
Dik, do specify A307 Grade A with Heavy Hex (which is not the standard but possible to get as I understand) or A307 Grade B which comes with heavy hex head as the default?

BAretired, I agree with that. Yes, I'm aware of using Grade B for cast iron flanges.

RE: A307 Heavy Hex Head

BAretired - thanks for the link; a lot of useful info.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources