Grid couplings are they the right choice for you?

Grid coupling or Biddy Coupling replacement

Grid couplings or Biddy Couplings are flexible couplings used in high torque, low misalignment applications.

Biddy couplings were originally invented by Dr James Biddy in 1917, by mating two shafts together with hubs and a specially wound and tempered spring to allow the two shafts to become angularly misaligned.

Grid couplings small amount of angular misalignment is a disadvantage.

The maximum amount of misalignment of a grid coupling is only 1/2°, making them similar to a jaw coupling, a simple coupling with limited use.

The major difference between a jaw coupling and a grid coupling is the grid coupling can handle far higher torque and it has no elastomeric insert, like the jaw couplings elastomeric spider.

Vibration is handled differently in the different couplings, jaw couplings vibration is absorbed by the elastomeric insert, where with the grid coupling, the vibration is absorbed by the grid spring.

No Internal spiders or components to maintain or replace.

The advantage the grid coupling has over the jaw coupling is the reduced maintenance costs, mainly due to not needing to replace the spider inserts. While it uses less, the grids being aligned between grooved hubs teeth and greased still wear out by wearing against the hubs, so the grid need to be replaced but not as often.

Their high torque capacity but limited flexibility limits their usefulness as a coupling option so they traditionally are used in pumps and motors.

Grid coupling vs Twin Spring , the same but different.

We at Twin Spring offer a lot of the similar features but at a lower price but with increased flexibility.

Springs verses grid springs = same long life.

No internal components – Greased single ball bearing in the Twin Spring Coupling, greased grid spring.

Springs – Both couplings absorb vibration with their springs so equal there also.

Twin Spring is more flexible than a grid coupling.

Flexibility and alignment rigidity – Twin Spring couplings are far more flexible, up to 45° but stays rigid at high speed with minimal angular misalignment.

Ultimate Torque – Twin Springs couplings only are comparable to the 1020, 1030 and 1040 with both the 1000T10 and 1000T20 Horizontal slip and vertical split couplings.

Twin Spring Couplings are cheaper than a grid coupling, 1 coupling no covers or extras.

Price – The Twin Spring Couplings are priced at that of a jaw coupling and universal joint making them cheaper than a grid coupling, plus there is no need to replace the grid spring which wear due to constantly rubbing again the grid hubs.

For more details on Twin Springs range of couplings go to

Twin Spring Coupling replaces

TB Woods G-Flex grid coupling 1000T10 – 1000T20- 1020, 1030, 1040

Lovejoy Grid Coupling 1020, 1030, 1040

Falk Steelflex 1020T10, 1030T10, 1040T10, 1020T20, 1030T20, 1040T20.

Morse/Browning® Grid-Flex® – GF2020H, GF2030H, GF2040H, GF2020V, GF2030V, GF2040V.

Dodge® Grid-Lign® – 1020T10, 1030T10, 1040T10, 1020T20, 1030T20, 1040T20.

Kop-Flex® Kop-Grid® 1020H, 1030H, 1040H, 1020V, 1030V, 1040V.

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