×
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

Standard Hooks for #18 Rebar

Standard Hooks for #18 Rebar

Standard Hooks for #18 Rebar

(OP)
Are there any codes that prohibit specifying a 180 degree hook for #18 rebar or recommendations against? I have received a recommendation from a fabricator against a 180 degree hook for #18 rebar stating it will put undue stress on the bar, risking breakage.

RE: Standard Hooks for #18 Rebar

I heard that they're exceedingly difficult to bend, so much so that if you see them bent it might be reasonable to assume a blowtorch assisted the process, which, of course, reduces its capacity.

RE: Standard Hooks for #18 Rebar

Fabricators should not be using a torch when bending, and I have never seen that done at a reputable shop. The rusty corners are the result of spalling of mill scale and the effect of cold work on the bar, not heat.
The 180 degree is a standard hook, and on a #18, it should be about 2'-4.5" out-to-out. Bending a 180 requires the same forces as bending a 90, since the additional bending is performed on an additional length of bar. The hard part is actually bending a hook that big, and even starting a bend in a bar that big requires very large forces.
(And higher grade bar requires substantially more force.)

RE: Standard Hooks for #18 Rebar

#18 bar? I've only ever heard of those being used in transportation infrastructure. Damn near impossible to splice those things. But in theory, there is no reason you can't hook them, provided you follow the minimum bend diameters for a bar that size.

Heating won't necessarily reduce the strength. You just have to make sure it cools down very slowly. A bar that large, however will have a pretty big quenching effect, so it may be pretty difficult to get it done properly.

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