Contact US

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!

*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

Question About Linear Bearing (LMH16UU)

Question About Linear Bearing (LMH16UU)

Question About Linear Bearing (LMH16UU)

Quick question; does anyone know whether a linear bearing, such as the flanged unit with part number LMH16UU, will allow for a twisting motion of the shaft (roll), as well as longitudinal movement?

RE: Question About Linear Bearing (LMH16UU)

I expect that linear ball bearing guides will not be particularly tolerant of shaft rotation, but will not entirely prevent it. The problem is that the balls will be in sliding contact with the surfaces of the guide slot.

Follow this link: https://www.thkstore.com/files/index/download/id/3...

I see the following on page 111 of that PDF:

Rotational Use Not Allowed
The Linear Bushing is not suitable for rotational
use for a structural reason. (See Fig.10 .)
Forcibly rotating it may cause an unexpected

RE: Question About Linear Bearing (LMH16UU)

Thanks for the info guys, very helpful! I guess a pacific bearing is the way to go.

RE: Question About Linear Bearing (LMH16UU)

Badger -

Just make sure that the pressure and velocity match bearing capacity.

p.s. - are you a bodger, as in green wood work? I do that myself.

RE: Question About Linear Bearing (LMH16UU)

Okay, thanks for the heads up. I think I should be okay as what I need it for is quite a low-pressure, low-velocity application.

I didn't mean bodger in that sense of the word, never heard that one! Done some woodworking in the past, but not that kind.

RE: Question About Linear Bearing (LMH16UU)

Thanks for the suggestion, looks like it would do the job but I was hoping to find something with a flange and bolt holes to secure it to a metal plate.

RE: Question About Linear Bearing (LMH16UU)

A flange probably won't work. Since the balls are captive and don't recirculate, they will tend to travel at half the speed differential of the separated parts. Adding a flange and tying them to one part will force the balls to skid. The McMaster Carr units are linear bearings, so they have recirculating paths and cannot rotate as the OP desires.

I do see McM-C offer linear/rotary versions, which look like a linear inner bearing with a rotary bearing on the outside.

RE: Question About Linear Bearing (LMH16UU)

Wrong McMasters Link.

Linear and Rotary Ball Bearings

Engineered for simultaneous linear and rotary motion, these bearings allow rotary speeds up to 3,600 rpm. They are for use with round end-supported shafts. The fixed-alignment design is for use where shaft misalignment is unlikely. End seals keep lubricant in and dirt out. To install, slide bearings into a housing (not included) and secure with two retaining rings (sold individually).

For technical drawings and 3-D models, click on a part number.For technical drawings and 3-D models, click on a part number.


For Shaft
Dia. Overall
Lg. For Housing ID Retaining Ring Groove
End-to-End Lg. Dynamic Load
Capacity, lbs. Dynamic Rotary
Load Capacity Max.
Speed, rpm Max.
Temperature, ° F For Shaft Material Each Each
Fixed Alignment
Steel Bearings
3/8" 7/8" 0.6250" - 0.6255" 9/16" 70 29 lbs. @ 500 rpm 3,600 200° Stainless Steel, Steel 6485K11 $75.00 9968K23 $0.40
1/2" 1 1/4" 0.8750" - 0.8755" 7/8" 185 76 lbs. @ 500 rpm 3,600 200° Stainless Steel, Steel 6485K12 78.57 9968K24 .56
3/4" 1 5/8" 1.2500" - 1.2505" 1 1/16" 325 133 lbs. @ 500 rpm 3,600 200° Stainless Steel, Steel 6485K14 85.71 9968K26 .85
1" 2 1/4" 1.5625" - 1.5630" 1 5/8" 450 185 lbs. @ 500 rpm 3,600 200° Stainless Steel, Steel 6485K15 151.79 9968K27 1.21
1 1/2" 3" 2.3750" - 2.3760" 2 1/4" 935 383 lbs. @ 500 rpm 3,600 200° Stainless Steel, Steel 6485K17 266.07 9968K29 2.93

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close