×
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

Questions regading Metric U-Bolt designation

Questions regading Metric U-Bolt designation

Questions regading Metric U-Bolt designation

(OP)
Hi everyone,

I have a metric U-bolt designation of M14 OD X 2 mm pitch X 60 mm long thread length and a 215 mm total length. There is a 79.5 mm center to center distance. The U-bolt is a 9.8 class, and it has a designation of "PX" after the class rating.

I was told the PX designation is the type of bolt, but does anyone know exactly what it means ? Does this simply tell that it is a U bolt, or does it mean something else ?

A 9.8 class somewhere between a grade 5 and a grade 8, right ?

Regarding the overall length of a U bolt, is this generally considered as dimension C as shown in the attached drawing, (end of threads to inside of flat portion) or is it generally considered from the end of the threads to the outside of the flat portion ? I only have written specs on the U-bolt, no drawing.

Thanks
John

RE: Questions regading Metric U-Bolt designation

The PX might be a symbol for the manufacturer.  It may be a product descriptor from the manufacturer.  I have never seen PX associated with a U-bolt.

According to SAE J1199, property class 9.8 has a tensile strength of 900 MPa and a hardness of 27 to 36 HRC.  Compare this to a Grade 5 according to SAE J429 which has a tensile strength of 830 MPa (120 ksi) and a hardness range of 25 to 34 HRC.

The dimension C is the grip length plus the thread length, which is important for joint calculations.

Regards,

Cory

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.

RE: Questions regading Metric U-Bolt designation

The "PX" is likely the manufacturer's identification.

A class 9.8 M14x2 bolt should have a yield strength of 82.8 kN and an UTS of 104 kN,

RE: Questions regading Metric U-Bolt designation

(OP)
Thanks for the feedback guys.

John

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