Dynaflex® Shear-Type Couplings

Part # J-1211-2-3

LORD Dynaflex® Shear-Type Couplings are compact, one-piece flexible couplings economically constructed to isolate low-frequency vibration and accommodate multidirectional misalignment.

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HP @ 1750 rpm Ref. 1/8
Torque Rating Lbs.-in 5.00 lbs./in.
Static Torsional Stiffness 0.33 lb-in/deg +/- 20%
Set Screw Size 10/24
Part No. J-1211-2-3 | J121123
Manufacturer LORD Corporation
Part Category Vibration Control
Part Section DYNAFLEX® Couplings - Shear-Type
Part Status
Call +1 800 657-0747 or use the
webform to the right on this page
Part Alternative
Call +1 800 657-0747  or use the
webform to the right on this page


Catalog Page No.
Catalog Section Page No.
Rubber Parts Catalog DYNAFLEX COUPLING Page - 4
LORD - PC7000 rev1 DYNAFLEX COUPLING Page - 91



Dimensions Technical Drawing
Dimension Measurement Description
A 0.312 in. Standard Bore Diameter
B 0.312 in. Standard Bore Diameter
C 0.75 in.  
D 1.00 in. Reference Dimension
E 0.72 in. Reference Dimension
F 1.75 in.  
SCREW 10/24 Set Screw Size

Table 2

Standard Bore Tolerances

Bore Sizes Tolerance
from 0.000 to 0.499 + 0.0010 - 0.0000
from 0.500 to 0.749 + 0.0015 - 0.0000
from 0.750 to 1.499 + 0.0020 - 0.0000
NOTE: Intrusion should not exceed “E” bore length dimensions  

Maximum recommended misalignment

1/32 inch parallel, 2° angular


Intrusion should not exceed “E” bore length dimensions

Table 2

Standard Bore Tolerances

Bore Sizes Tolerance
from 0.000 to 0.499 + 0.0010 - 0.0000
from 0.500 to 0.749 + 0.0015 - 0.0000
from 0.750 to 1.499 + 0.0020 - 0.0000

Standard Construction

  • Hubs - steel
  • Bores - as listed
  • Set Screws - one per hub furnished but not installed
  • Flexing Element - neoprene


None Noted

Isolation Performance

Refer to Engineering Guide, Sample Problems section for a step by step method to calculate system natural frequencies and isolation efficiency.

Custom Designs

Customized designs and special elastomer compounds for specific problems are available. These may result in spring rates and dimensions other than shown.

Custom Parts

Our custom molding department can make a part just for your application.


Would you like some assistance in selecting the right mount for your application?  Our engineering department can help.  Please call or use the webform below.  We will be glad to assist.

Not what you are looking for?

Our knowledgeable staff can assist you with whatever you need.  From Special Packaging, Overnight shipments to applications engineering. DeltaFlex is ready to help find a solution.

Engineering Assistance

"Frequently vibration isolation problems require a system engineering analysis..." - Put us to work for you.

DeltaFlex has the computer capability, as well as specialized programs, for analyzing engine/transmission combinations. The output from these analyses is a mounting proposal which optimizes performance over the complete range of operating speeds. This service is available to you upon request. If you require this type of engineering assistance please call 800.657.0747 we will be glad to assist you.

What is the impact of Vibration Control?

The biggest impact that vibration isolation can have, is with the end users of our customers products, more importantly their perception of the quality of those products.

Values states herein represent typical values as not all test are run on each lot produced. For formalized product specifications or specific product end uses, contact Customer Service 262.632.2345.

A part’s listing on this website does not guarantee its availability.