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Beam Couplings for Encoders
Ruland 4-beam couplings are manufactured from a single piece of aluminum or stainless steel with multiple spiral (helical) cuts allowing for a zero-backlash encoder coupling with higher accuracy and better overall misalignment capabilities than traditional single beam couplings. They are designed with extra flexibility to provide reduced bearing loads, which is critical in encoders which have small sensitive bearings. Ruland 4-beam couplings have a balanced design for reduced vibration at speeds up to 6,000 RPM. Ruland manufactures two series of 4-beam couplings, P and MW, giving designers a variety of performance and dimensional characteristics to choose from. Ruland manufactures 4-beam couplings in our Marlborough, Massachusetts factory with bore sizes ranging from 3/32” to 1/2” or 3mm to 12mm.
Products
Download CAD File:
PCR18-1/2\"-10MM-A
PCR18-1/2"-10MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-10MM-A, 1/2" x 10mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-1/2\"-11MM-A
PCR18-1/2"-11MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-11MM-A, 1/2" x 11mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-1/2\"-12MM-A
PCR18-1/2"-12MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-12MM-A, 1/2" x 12mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-1/2\"-6MM-A
PCR18-1/2"-6MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-6MM-A, 1/2" x 6mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-1/2\"-7MM-A
PCR18-1/2"-7MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-7MM-A, 1/2" x 7mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-1/2\"-8MM-A
PCR18-1/2"-8MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-8MM-A, 1/2" x 8mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-1/2\"-9MM-A
PCR18-1/2"-9MM-A
As low as
$47.49
$69.65
Ruland PCR18-1/2"-9MM-A, 1/2" x 9mm Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-10MM-1/4\"-SS
PCR18-10MM-1/4"-SS
As low as
$119.59
$175.40
Ruland PCR18-10MM-1/4"-SS, 10mm x 1/4" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-10MM-3/8\"-SS
PCR18-10MM-3/8"-SS
As low as
$119.59
$175.40
Ruland PCR18-10MM-3/8"-SS, 10mm x 3/8" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-10MM-5/16\"-SS
PCR18-10MM-5/16"-SS
As low as
$119.59
$175.40
Ruland PCR18-10MM-5/16"-SS, 10mm x 5/16" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-9MM-1/4\"-SS
PCR18-9MM-1/4"-SS
As low as
$119.59
$175.40
Ruland PCR18-9MM-1/4"-SS, 9mm x 1/4" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-9MM-5/16\"-SS
PCR18-9MM-5/16"-SS
As low as
$119.59
$175.40
Ruland PCR18-9MM-5/16"-SS, 9mm x 5/16" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-10MM-A
PSR18-1/2"-10MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-10MM-A, 1/2" x 10mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-11MM-A
PSR18-1/2"-11MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-11MM-A, 1/2" x 11mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-12MM-A
PSR18-1/2"-12MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-12MM-A, 1/2" x 12mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-6MM-A
PSR18-1/2"-6MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-6MM-A, 1/2" x 6mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-7MM-A
PSR18-1/2"-7MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-7MM-A, 1/2" x 7mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-8MM-A
PSR18-1/2"-8MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-8MM-A, 1/2" x 8mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-1/2\"-9MM-A
PSR18-1/2"-9MM-A
As low as
$41.35
$60.64
Ruland PSR18-1/2"-9MM-A, 1/2" x 9mm Four Beam Coupling, Aluminum, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-10MM-1/4\"-SS
PSR18-10MM-1/4"-SS
As low as
$110.57
$162.16
Ruland PSR18-10MM-1/4"-SS, 10mm x 1/4" Four Beam Coupling, Stainless Steel, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-10MM-3/8\"-SS
PSR18-10MM-3/8"-SS
As low as
$110.57
$162.16
Ruland PSR18-10MM-3/8"-SS, 10mm x 3/8" Four Beam Coupling, Stainless Steel, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-10MM-5/16\"-SS
PSR18-10MM-5/16"-SS
As low as
$110.57
$162.16
Ruland PSR18-10MM-5/16"-SS, 10mm x 5/16" Four Beam Coupling, Stainless Steel, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-9MM-1/4\"-SS
PSR18-9MM-1/4"-SS
As low as
$110.57
$162.16
Ruland PSR18-9MM-1/4"-SS, 9mm x 1/4" Four Beam Coupling, Stainless Steel, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSR18-9MM-5/16\"-SS
PSR18-9MM-5/16"-SS
As low as
$110.57
$162.16
Ruland PSR18-9MM-5/16"-SS, 9mm x 5/16" Four Beam Coupling, Stainless Steel, Set Screw Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
PCR18-1/2"-10MM-A
0.5000 in
10 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-1/2"-11MM-A
0.5000 in
11 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-1/2"-12MM-A
0.5000 in
12 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-1/2"-6MM-A
0.5000 in
6 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-1/2"-7MM-A
0.5000 in
7 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-1/2"-8MM-A
0.5000 in
8 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-1/2"-9MM-A
0.5000 in
9 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-10MM-1/4"-SS
10 mm
0.2500 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PCR18-10MM-3/8"-SS
10 mm
0.3750 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PCR18-10MM-5/16"-SS
10 mm
0.3125 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PCR18-9MM-1/4"-SS
9 mm
0.2500 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PCR18-9MM-5/16"-SS
9 mm
0.3125 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-10MM-A
0.5000 in
10 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-11MM-A
0.5000 in
11 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-12MM-A
0.5000 in
12 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-6MM-A
0.5000 in
6 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-7MM-A
0.5000 in
7 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-8MM-A
0.5000 in
8 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-1/2"-9MM-A
0.5000 in
9 mm
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PSR18-10MM-1/4"-SS
10 mm
0.2500 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PSR18-10MM-3/8"-SS
10 mm
0.3750 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PSR18-10MM-5/16"-SS
10 mm
0.3125 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PSR18-9MM-1/4"-SS
9 mm
0.2500 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PSR18-9MM-5/16"-SS
9 mm
0.3125 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
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Now Shopping by
Static Torque
34 lb-in (3.84 Nm)
Static Torque
54.0 lb-in (6.10 Nm)
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