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Unit 1 - 6115 4 St SE
Calgary AB  T2H 2H9


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

Jaw Coupling Half 0.25" Series 12

ID: TRM4312_0

This aluminium jaw coupling fits a 0.25" shaft and connects to another half coupling with a spider.


Quantity Available: 116

Qty Price
5 $2.69
10 $2.58

This jaw type half-coupling can be used to connect a 0.25" 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.

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.


  • Use this to attach a 0.25" shaft to another piece of shaft
  • Connects to another Series 12 coupling and spider
  • Tightens on with two 1/16" set-screws


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
Part Number Price Material Shore Hardness
Jaw Coupling Spider Series 12
$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
Part Number Price Inner Diameter
Jaw Coupling Half 4mm Series 12
$3.00 4 mm
Jaw Coupling Half 5mm Series 12
$3.50 5 mm
Jaw Coupling Half 6mm Series 12
$2.80 6 mm
Jaw Coupling Half 0.25" Series 12
$2.80 14
Jaw Coupling Half 8mm Series 12
$3.00 8 mm
Jaw Coupling Half 9mm Series 12
$1.40 9 mm
Jaw Coupling Half 10mm Series 12 - 3mm Keyway
$3.60 10 mm
Jaw Coupling Half 10mm Series 12 - 4mm Keyway
$3.60 10 mm
Jaw Coupling Half 11mm Series 12
$1.40 11 mm
Jaw Coupling Half 12mm Series 12
$3.60 12 mm

Stepper Motors

Stepper motors have high torque and precise position control. This shaft coupler can connect to the main shaft of the following stepper motors:

Product Physical Properties Motor Properties Electrical Properties
Part Number Price Shaft Diameter Mounting Plate Size Rated Torque Step Angle Recommended Voltage
NEMA23 - 0.9 Degree - 2.8A Stepper - Gearless
$28.00 14 NEMA - 23 11.2 kg·cm 0.9° 24 V DC

Product Specifications

Physical Properties
Material Aluminum
Coupling Rated Torque 35.7 kg·cm
Coupling Rated Speed 12000 RPM
Inner Diameter 14
Hex Key Size Required 116
Customs Information
Canadian HS Export Code 8483.60.00
American HTS Import Code 8483.60.80.00
Country of Origin CN (China)