Products for USB Sensing and Control
Products for USB Sensing and Control


Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9
+1 403 282-7335

Jaw Coupling Half 4mm Series 12

ID: TRM4310_0
Recommended for new designs: Phidgets Inc. is not the original manufacturer for this product, but we intend to sell it (or a similar replacement with a compatible form, fit and function) for as long as it is available from the supplier.

This aluminium jaw coupling fits a 4mm shaft and connects to another half coupling with a spider.


Quantity Available: 114

Qty Price
5 $2.88
10 $2.76

This jaw type half-coupling can be used to connect a 4mm shaft to another shaft. It is held in place by two set screws, and fits together with another series 12 jaw coupling of any shaft size with a hard elastomer spider in between. See the Connection & Compatibility tab for a complete list of compatible couplings and spiders.

Jaw type couplings are ideal for high-torque applications and applications where shafts of two different sizes need to be coupled. This series of couplers are rated for torques as high as 35 kg·cm and speeds of up to 12000 rpm.

If you're having trouble with slipping, you can file a groove into the shaft where the set screws hold it in place. You can also use a Loctite adhesive on the set screws to ensure that they remain in place.


This jaw type half-coupling connects to any other series 12 half-coupling with a coupling spider pressed in between. The other half and the spider are both sold separately.


Jaw Coupling Spider

You'll need a coupling spider to connect this jaw coupling to another. You can find a list of compatible spiders below:

Product Physical Properties
Image Part Number Price Material Shore Hardness
TRM4335_0 $1.30 Elastomer 95-98A

Jaw Couplings


Jaw couplings are designed to connect to other jaws in the same series, which gives you the option of coupling two differently sized shafts together. Between the two jaw couplings, a coupling spider is used to hold them in place while still allowing for a small amount of flex. The jaw couplings in the list below will fit together with this coupling:

Product Physical Properties
Image Part Number Price Inner Diameter
TRM4310_0 $3.00 4 mm
TRM4311_0 $3.50 5 mm
TRM4312_0 $2.80 14
TRM4313_0 $3.00 8 mm
TRM4314_0 $2.80 9 mm
TRM4315_0 $3.60 10 mm
TRM4316_0 $2.80 11 mm
TRM4317_0 $3.60 12 mm
TRM4338_0 $2.80 6 mm


If you want to be able to measure the speed that a rotary system is moving at, you can use this 4mm shaft coupler to connect to any of these encoders:

Product Physical Properties Encoder Properties
Image Part Number Price Shaft Diameter Encoder Resolution Encoder Speed Max
3530_1 $50.00 4 mm 360 CPR 3000 RPM

Product Specifications

Physical Properties
Material Aluminum
Coupling Rated Torque 35.7 kg·cm
Coupling Rated Speed 12000 RPM
Inner Diameter 4 mm
Hex Key Size Required 1.5 mm
Customs Information
Canadian HS Export Code 8483.60.00
American HTS Import Code 8483.60.80.00
Country of Origin CN (China)