BSK21-6-6-A

$169.43 ea
Quantity Price (USD)
1 $169.43 ea
10 $101.66 ea
25 $84.72 ea
50 $76.24 ea
100 Request Quote
Built to Order Lead Time: 0-2 Days
Ruland BSK21-6-6-A, 3/8" x 3/8" Bellows Coupling, Aluminum, Set Screw Style With Keyway, 1.313" OD, 1.688" Length

PRODUCT SPECIFICATIONS

Ruland BSK21-6-6-A is a set screw bellows coupling with 3/8" x 3/8" bores, 1.313" OD, 1.688" length, and 3/32" x 3/32" keyways. It is zero-backlash and has a balanced design for reduced vibration at high speeds. BSK21-6-6-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 BSK21-6-6-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. BSK21-6-6-A is carefully manufactured in our Marlborough, MA factory under strict controls using proprietary processes.

PRODUCT SPECIFICATIONS

Dimensions

Large Bore B1

0.375 in

Small Bore B2

0.375 in

Keyway K

3/32 in

Keyway K2

3/32 in

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 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

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

63452917311

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.

CERTIFICATIONS/STANDARDS
ISO 9001:2015

Certified

Conflict Minerals

Compliant

RoHS3

Compliant

REACH

Compliant

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