TINYMITE™ Oldham Shaft Couplings

Basic Design

Inherent in the Oldham design is a unique characteristic – uniform velocity, regardless of shaft misalignment. In their original form, Oldham type couplings had backlash, needed lubrication, and accepted little angular misalignment. Renbrandt is the originator of improvements which greatly enhance their performance.

The Nylon centerpiece virtually eliminates backlash, noise and the need for lubrication. The cylindrical cross pins permit greater angular misalignment (up to 5º).


Style Set Screw
Size 1
Hub 1 Bore Diameter 0.125 Inch
Set Screw Size for Hub 1 Two 4 – 40 @ 120º
Hub 2 Bore Diameter 0.125 Inch
Set Screw Size for Hub 2 Two 4 – 40 @ 120º
Maximum Torque 20 in·oz
Maximum RPM 1200 rpm
Former Product No. A201-36
Overall Diameter 1/4 Inch
Maximum Bore 0.125 Inch
Length 7/16 Inch
Weight Weight
Misalignment (Ang.) 3 º
Misalignment (Offset) 1/32 Inch
Maximum Temperature 175 ºF


  • Uniform Velocity
  • Greater Misalignment (5º)
  • No Radial Load
  • Easy Separation
  • Zero Backlash
  • Light Weight/Low Inertia
  • Moderate Torque
  • 6000 Volt Insulation
  • Small Size
  • Torsional Rigidity
  • Low Cost

Why Our Couplings are Better

The function of every flexible coupling is to transmit power or motion control from one rotating shaft to another that is not perfectly aligned, without excessive bearing loads.

But since the requirements for transmitting power are not the same as they are for controlling motion, couplings designed to transmit power might well be unsuitable for motion control and vice versa.

For instance, a resilient coupling made with rubber or springs would work well delivering power because it could absorb vibration and/or shock loads, but would not work well controlling motion. Here’s why: In a motion control system, every component in the drive train (including couplings) affects the accuracy of the system by the amount of compliance (Wind-Up), Inertia, Friction, Backlash, etc. – things quite unimportant when transmitting power. A coupling that absorbs vibration must by definition, have Wind-Up, Inertia, or Backlash; whereas a true-motion control coupling must have no Backlash, low Inertia, and very low Wind-Up.

There are many applications, which are extremely sensitive to these factors. Today’s encoders, for instance, can discriminate down to a few seconds of arc. (That’s the width of a dime seen from 2 miles away) So you see how couplings can affect the success of your design.

Torsional Wind-Up is a very important factor. Notice in the graphs how outstanding RENBRANDT Couplings are.

Other manufacturers offer similar misalignment accommodation and low compliance – BUT NOT IN THE SAME PRODUCT.

The system must also be free from imbalance, vibration, and oscillation in order to prevent hunting – especially in closed-loop systems where a null balance is established between error signals. Since 1951 RENBRANDT has been building and improving Servo Couplings that provide reliability and long life free from maintenance – at moderate cost.

Sizes/Part Numbers

Item # Bore Diameter High Torque Inside Bore Diameter Misalignment
A-600-1 0.1875 Inch
4.76 mm
8 ft/lb 7/16 Inch 40 º
A-600-2 0.25 Inch
6.35 mm
8 ft/lb 7/16 Inch 40 º
A-600-3 0.3125 Inch
7.94 mm
8 ft/lb 7/16 Inch 40 º
A-600-4 0.375 Inch
9.53 mm
8 ft/lb 7/16 Inch 40 º
A-600-5 0.4375 Inch
11.11 mm
8 ft/lb 7/16 Inch 40 º

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