BCK21-8-5-A
$183.82
ea
Ruland BCK21-8-5-A, 1/2" x 5/16" Bellows Coupling, Aluminum, Clamp Style With Keyway, 1.313" OD, 1.688" Length
PRODUCT SPECIFICATIONS
Ruland BCK21-8-5-A is a bellows coupling with 1/2" x 5/16" bores, 1.313" OD, 1.688" length, and 1/8" keyway on the 1/2" bore and no keyway on the 5/16" bore. It is zero-backlash and has a balanced design for reduced vibration at high speeds. BCK21-8-5-A is comprised of two anodized aluminum hubs and a stainless steel bellows. The bellows are able to flex while remaining rigid under torsional loads allowing for all types of misalignment to be accommodated. This bellows coupling is lightweight and has low inertia making it suitable for applications with speeds up to 10,000 RPM. Hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. Ruland manufactures BCK21-8-5-A to be torsionally rigid and an excellent fit for precise positioning stepper servo applications as well as encoders. It is machined from solid bar stock that is sourced exclusively from North American mills and RoHS2 and REACH compliant. BCK21-8-5-A is carefully manufactured in our Marlborough, MA factory under strict controls using proprietary processes.
PRODUCT SPECIFICATIONS
| Dimensions | |||
|---|---|---|---|
Large Bore B1 |
0.500 in |
Small Bore B2 |
0.313 in |
Keyway K |
1/8 in |
Keyway K2 |
NK |
B1 Shaft Penetration |
0.804 in |
B2 Shaft Penetration |
0.804 in |
Outer Diameter OD |
1.313 in |
Bore Tolerance |
+.001 in / -.000 in |
Length L |
1.688 in |
Hub Width LH |
0.590 in |
| Fastening Hardware | |||
Forged Clamp Screw |
M3 |
Screw Material |
Alloy Steel |
Hex Wrench Size |
2.5 mm |
Screw Finish |
Black Oxide |
Seating Torque |
2.1 Nm |
Number of Screws |
2 ea |
| Performance Specifications | |||
Static Torque |
120 lb-in |
Angular Misalignment |
1.5° |
Dynamic Torque Non-Reversing |
60 lb-in |
Parallel Misalignment |
0.006 in |
Dynamic Torque Reversing |
30 lb-in |
Axial Motion |
0.016 in |
Torsional Stiffness |
400 lb-in/Deg |
Maximum Speed |
10,000 RPM |
| Additional Information | |||
Material Specification |
Hubs: 2024-T351 Aluminum Bar |
Temperature |
-40°F to 200°F |
Finish Specification |
Sulfuric Anodized MIL-A-8625 Type II, Class 2 and ASTM B580 Type B Black Anodize |
Manufacturer |
Ruland Manufacturing |
Country of Origin |
USA |
Weight (lbs.) |
0.1650 |
UPC |
63452916509 |
||
| Product Notes | |||
Note 1 |
Stainless steel hubs are available upon request. |
Note 2 |
Torque ratings are at maximum misalignment. |
Note 3 |
Performance ratings are for guidance only. The user must determine suitability for a particular application. |
Note 4 |
Torque ratings for the couplings are based on the physical limitations/failure point of the metal bellows. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the metal bellows. Please consult technical support for more assistance. |
