BCK21-8-5-A

$193.02 ea

Quantity	Price (USD)
1	$193.02 ea
10	$115.81 ea
25	$96.51 ea
50	$86.86 ea
100	Request Quote

Built to Order Lead Time: 0-2 Days

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Ruland BCK21-8-5-A, 1/2" x 5/16" Bellows Coupling, Aluminum, Clamp Style With Keyway, 1.313" OD, 1.688" Length

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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 K1	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 Bellows: Type 321 Stainless Steel	Temperature	-40°F to 200°F -40°C to 93°C
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.
Prop 65	WARNING This product can expose you to chemicals including Ethylene Thiourea and Nickel (metallic), known to the State of California to cause cancer, and Bisphenol A and Ethylene Thiourea, known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.