×
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

Lock Washer at Open Web Steel Joist Bolted-Connection

Lock Washer at Open Web Steel Joist Bolted-Connection

Lock Washer at Open Web Steel Joist Bolted-Connection

(OP)
If the final connection for an Open Web Steel Joist (OWSJ), to support, were to be a bolted-connection, would a lock-washer provide any credible structural integrity?

Thank you!

RE: Lock Washer at Open Web Steel Joist Bolted-Connection

Most lock washers do nothing but make people feel good.

https://www.youtube.com/watch?v=IKwWu2w1gGk

Nord-Locks and Loktite are the only ways I trust to work the majority of times with minimal QA/QC. Cotter-pins and wiring the bolts are good but rely on installers to install it properly and a lack of QA/QC can hurt them.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
https://www.facebook.com/AmericanConcrete/

RE: Lock Washer at Open Web Steel Joist Bolted-Connection

Additionally, the RCSC has no test data for connections using lock-type washers, so they are not pre-qualified for use in bolted structural connections. I advise you stick with the connection details for which there are published, test-validated load capacities.
Dave

Thaidavid

RE: Lock Washer at Open Web Steel Joist Bolted-Connection

No.

RE: Lock Washer at Open Web Steel Joist Bolted-Connection


NASA's Fastner Design publication, 1228, states lockwashers are useless. The Navy's Ship Manual (S9086-CJ-STM-010/CH-075R2)Chapter 75 prefers locking nuts; although it states that lockwashers can be used on diesel equipment if there wasn't any previous bolt loosening.

RE: Lock Washer at Open Web Steel Joist Bolted-Connection

I propose we re-label "lock washers" as "slip washers" so clients and equipment vendors stop asking for them. Double talk should not be tolerated in engineering.

RE: Lock Washer at Open Web Steel Joist Bolted-Connection

If properly 'snug tight' should not loosen.

Dik

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