BSK21-11MM-3/8"-A

$180.68 ea

Quantity	Price (USD)
1	$180.68 ea
10	$108.41 ea
25	$90.34 ea
50	$81.31 ea
100	Request Quote

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Ruland BSK21-11MM-3/8"-A, 11mm x 3/8" Bellows Coupling, Aluminum, Set Screw Style With Keyway, 1.313" (33.3mm) OD, 1.688" (42.9mm) Length

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PRODUCT SPECIFICATIONS

Ruland BSK21-11MM-3/8"-A is a set screw bellows coupling with 11mm x 3/8" bores, 1.313" (33.3mm) OD, 1.688" (42.9mm) length, and 4mm x 3/32" keyways. It is zero-backlash and has a balanced design for reduced vibration at high speeds. BSK21-11MM-3/8"-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 BSK21-11MM-3/8"-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. BSK21-11MM-3/8"-A is carefully manufactured in our Marlborough, MA factory under strict controls using proprietary processes.

PRODUCT SPECIFICATIONS

Dimensions
Large Bore B1	11 mm	Small Bore B2	0.375 in
Keyway K	4 mm	Keyway K2	3/32 in
B1 Shaft Penetration	0.804 in, 20.4 mm	B2 Shaft Penetration	0.804 in, 20.4 mm
Outer Diameter OD	1.313 in / 33.3 mm	Bore Tolerance	+.001 in / -.000 , +.03 mm / -.00 mm
Length L	1.688 in, 42.9 mm	Hub Width LH	0.590 in, 15.00 mm
Fastening Hardware
Forged Set Screw	M4	Screw Material	Alloy Steel
Hex Wrench Size	2.0 mm	Screw Finish	Black Oxide
Seating Torque	2.2 Nm	Number of Screws	4 ea
Performance Specifications
Static Torque	120 lb-in, 13.6 Nm	Angular Misalignment	1.5°
Dynamic Torque Non-Reversing	60 lb-in, 6.80 Nm	Parallel Misalignment	0.006 in, 0.15 mm
Dynamic Torque Reversing	30 lb-in, 3.40 Nm	Axial Motion	0.016 in, 0.40 mm
Torsional Stiffness	400 lb-in/Deg, 45 Nm/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	63452916930
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. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the rated torque of the metal bellows. Keyways are available to provide additional torque capacity in the shaft/hub connection when required. 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.