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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:
PCR14-8MM-3/16\"-A
PCR14-8MM-3/16"-A
As low as
$37.53
$55.04
Ruland PCR14-8MM-3/16"-A, 8mm x 3/16" Four Beam Coupling, Aluminum, Clamp Style, 0.875" (22.2mm) OD, 1.063" (27.0mm) Length
Download CAD File:
PCR14-8MM-3/16\"-SS
PCR14-8MM-3/16"-SS
As low as
$98.42
$144.36
Ruland PCR14-8MM-3/16"-SS, 8mm x 3/16" Four Beam Coupling, Stainless Steel, Clamp Style, 0.875" (22.2mm) OD, 1.063" (27.0mm) Length
Download CAD File:
PCR14-8MM-5/16\"-A
PCR14-8MM-5/16"-A
As low as
$37.53
$55.04
Ruland PCR14-8MM-5/16"-A, 8mm x 5/16" Four Beam Coupling, Aluminum, Clamp Style, 0.875" (22.2mm) OD, 1.063" (27.0mm) Length
Download CAD File:
PCR14-8MM-5/16\"-SS
PCR14-8MM-5/16"-SS
As low as
$98.42
$144.36
Ruland PCR14-8MM-5/16"-SS, 8mm x 5/16" Four Beam Coupling, Stainless Steel, Clamp Style, 0.875" (22.2mm) OD, 1.063" (27.0mm) Length
Download CAD File:
PCR16-8MM-1/4\"-A
PCR16-8MM-1/4"-A
As low as
$40.03
$58.71
Ruland PCR16-8MM-1/4"-A, 8mm x 1/4" Four Beam Coupling, Aluminum, Clamp Style, 1.000" (25.4mm) OD, 1.250" (31.8mm) Length
Download CAD File:
PCR16-8MM-1/4\"-SS
PCR16-8MM-1/4"-SS
As low as
$99.80
$146.37
Ruland PCR16-8MM-1/4"-SS, 8mm x 1/4" Four Beam Coupling, Stainless Steel, Clamp Style, 1.000" (25.4mm) OD, 1.250" (31.8mm) Length
Download CAD File:
PCR16-8MM-5/16\"-A
PCR16-8MM-5/16"-A
As low as
$40.03
$58.71
Ruland PCR16-8MM-5/16"-A, 8mm x 5/16" Four Beam Coupling, Aluminum, Clamp Style, 1.000" (25.4mm) OD, 1.250" (31.8mm) Length
Download CAD File:
PCR16-8MM-5/16\"-SS
PCR16-8MM-5/16"-SS
As low as
$99.80
$146.37
Ruland PCR16-8MM-5/16"-SS, 8mm x 5/16" Four Beam Coupling, Stainless Steel, Clamp Style, 1.000" (25.4mm) OD, 1.250" (31.8mm) Length
Download CAD File:
PCR18-8MM-1/4\"-A
PCR18-8MM-1/4"-A
As low as
$47.49
$69.65
Ruland PCR18-8MM-1/4"-A, 8mm x 1/4" Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-8MM-1/4\"-SS
PCR18-8MM-1/4"-SS
As low as
$119.59
$175.40
Ruland PCR18-8MM-1/4"-SS, 8mm x 1/4" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-8MM-5/16\"-A
PCR18-8MM-5/16"-A
As low as
$47.49
$69.65
Ruland PCR18-8MM-5/16"-A, 8mm x 5/16" Four Beam Coupling, Aluminum, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR18-8MM-5/16\"-SS
PCR18-8MM-5/16"-SS
As low as
$119.59
$175.40
Ruland PCR18-8MM-5/16"-SS, 8mm x 5/16" Four Beam Coupling, Stainless Steel, Clamp Style, 1.125" (28.6mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR20-8MM-1/4\"-A
PCR20-8MM-1/4"-A
As low as
$58.15
$85.29
Ruland PCR20-8MM-1/4"-A, 8mm x 1/4" Four Beam Coupling, Aluminum, Clamp Style, 1.250" (31.8mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR20-8MM-1/4\"-SS
PCR20-8MM-1/4"-SS
As low as
$146.33
$214.61
Ruland PCR20-8MM-1/4"-SS, 8mm x 1/4" Four Beam Coupling, Stainless Steel, Clamp Style, 1.250" (31.8mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR20-8MM-5/16\"-A
PCR20-8MM-5/16"-A
As low as
$58.15
$85.29
Ruland PCR20-8MM-5/16"-A, 8mm x 5/16" Four Beam Coupling, Aluminum, Clamp Style, 1.250" (31.8mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PCR20-8MM-5/16\"-SS
PCR20-8MM-5/16"-SS
As low as
$146.33
$214.61
Ruland PCR20-8MM-5/16"-SS, 8mm x 5/16" Four Beam Coupling, Stainless Steel, Clamp Style, 1.250" (31.8mm) OD, 1.500" (38.1mm) Length
Download CAD File:
PSMR22-8-5-A
PSMR22-8-5-A
As low as
$33.30
$48.83
Ruland PSMR22-8-5-A, 8mm x 5mm Four Beam Coupling, Aluminum, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-5-SS
PSMR22-8-5-SS
As low as
$90.29
$132.43
Ruland PSMR22-8-5-SS, 8mm x 5mm Four Beam Coupling, Stainless Steel, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-6-A
PSMR22-8-6-A
As low as
$33.30
$48.83
Ruland PSMR22-8-6-A, 8mm x 6mm Four Beam Coupling, Aluminum, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-6-SS
PSMR22-8-6-SS
As low as
$90.29
$132.43
Ruland PSMR22-8-6-SS, 8mm x 6mm Four Beam Coupling, Stainless Steel, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-7-A
PSMR22-8-7-A
As low as
$33.30
$48.83
Ruland PSMR22-8-7-A, 8mm x 7mm Four Beam Coupling, Aluminum, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-7-SS
PSMR22-8-7-SS
As low as
$90.29
$132.43
Ruland PSMR22-8-7-SS, 8mm x 7mm Four Beam Coupling, Stainless Steel, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-8-A
PSMR22-8-8-A
As low as
$33.30
$48.83
Ruland PSMR22-8-8-A, 8mm x 8mm Four Beam Coupling, Aluminum, Set Screw Style, 22.2mm OD, 27.0mm Length
Download CAD File:
PSMR22-8-8-SS
PSMR22-8-8-SS
As low as
$90.29
$132.43
Ruland PSMR22-8-8-SS, 8mm x 8mm Four Beam Coupling, Stainless Steel, Set Screw Style, 22.2mm OD, 27.0mm Length
Part number
Bore (B1)
Small Bore (B2)
Length (L)
Material
Outer Diameter (OD)
Maximum Speed
PCR14-8MM-3/16"-A
8 mm
0.1875 in
1.063 in (27.0 mm)
Aluminum
0.875 in (22.2 mm)
6,000 RPM
PCR14-8MM-3/16"-SS
8 mm
0.1875 in
1.063 in (27.0 mm)
303 Stainless Steel
0.875 in (22.2 mm)
6,000 RPM
PCR14-8MM-5/16"-A
8 mm
0.3125 in
1.063 in (27.0 mm)
Aluminum
0.875 in (22.2 mm)
6,000 RPM
PCR14-8MM-5/16"-SS
8 mm
0.3125 in
1.063 in (27.0 mm)
303 Stainless Steel
0.875 in (22.2 mm)
6,000 RPM
PCR16-8MM-1/4"-A
8 mm
0.2500 in
1.250 in (31.8 mm)
Aluminum
1.000 in (25.4 mm)
6,000 RPM
PCR16-8MM-1/4"-SS
8 mm
0.2500 in
1.250 in (31.8 mm)
303 Stainless Steel
1.000 in (25.4 mm)
6,000 RPM
PCR16-8MM-5/16"-A
8 mm
0.3125 in
1.250 in (31.8 mm)
Aluminum
1.000 in (25.4 mm)
6,000 RPM
PCR16-8MM-5/16"-SS
8 mm
0.3125 in
1.250 in (31.8 mm)
303 Stainless Steel
1.000 in (25.4 mm)
6,000 RPM
PCR18-8MM-1/4"-A
8 mm
0.2500 in
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-8MM-1/4"-SS
8 mm
0.2500 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PCR18-8MM-5/16"-A
8 mm
0.3125 in
1.500 in (38.1 mm)
Aluminum
1.125 in (28.6 mm)
6,000 RPM
PCR18-8MM-5/16"-SS
8 mm
0.3125 in
1.500 in (38.1 mm)
303 Stainless Steel
1.125 in (28.6 mm)
6,000 RPM
PCR20-8MM-1/4"-A
8 mm
0.2500 in
1.500 in (38.1 mm)
Aluminum
1.250 in (31.8 mm)
6,000 RPM
PCR20-8MM-1/4"-SS
8 mm
0.2500 in
1.500 in (38.1 mm)
303 Stainless Steel
1.250 in (31.8 mm)
6,000 RPM
PCR20-8MM-5/16"-A
8 mm
0.3125 in
1.500 in (38.1 mm)
Aluminum
1.250 in (31.8 mm)
6,000 RPM
PCR20-8MM-5/16"-SS
8 mm
0.3125 in
1.500 in (38.1 mm)
303 Stainless Steel
1.250 in (31.8 mm)
6,000 RPM
PSMR22-8-5-A
8 mm
5 mm
27.0 mm
Aluminum
22.2 mm
6,000 RPM
PSMR22-8-5-SS
8 mm
5 mm
27.0 mm
303 Stainless Steel
22.2 mm
6,000 RPM
PSMR22-8-6-A
8 mm
6 mm
27.0 mm
Aluminum
22.2 mm
6,000 RPM
PSMR22-8-6-SS
8 mm
6 mm
27.0 mm
303 Stainless Steel
22.2 mm
6,000 RPM
PSMR22-8-7-A
8 mm
7 mm
27.0 mm
Aluminum
22.2 mm
6,000 RPM
PSMR22-8-7-SS
8 mm
7 mm
27.0 mm
303 Stainless Steel
22.2 mm
6,000 RPM
PSMR22-8-8-A
8 mm
8 mm
27.0 mm
Aluminum
22.2 mm
6,000 RPM
PSMR22-8-8-SS
8 mm
8 mm
27.0 mm
303 Stainless Steel
22.2 mm
6,000 RPM
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