BS12-4-4-A

$116.99 ea
Quantity Price (USD)
1 $116.99 ea
10 $70.19 ea
25 $58.50 ea
50 $52.65 ea
100 Request Quote
Built to Order Lead Time: 0-2 Days
Ruland BS12-4-4-A, 1/4" x 1/4" Bellows Coupling, Aluminum, Set Screw Style, 0.750" OD, 1.188" Length

PRODUCT SPECIFICATIONS

Ruland BS12-4-4-A is a set screw bellows coupling with 1/4" x 1/4" bores, 0.750" OD, and 1.188" length. It is zero-backlash and has a balanced design for reduced vibration at high speeds. BS12-4-4-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 BS12-4-4-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. BS12-4-4-A is carefully manufactured in our Marlborough, MA factory under strict controls using proprietary processes.

PRODUCT SPECIFICATIONS

Dimensions

Large Bore B1

0.250 in

Small Bore B2

0.250 in

B1 Shaft Penetration

0.570 in

B2 Shaft Penetration

0.570 in

Outer Diameter OD

0.750 in

Bore Tolerance

+.001 in / -.000 in

Length L

1.188 in

Hub Width LH

0.410 in

Fastening Hardware

Forged Set Screw

M3

Screw Material

Alloy Steel

Hex Wrench Size

1.5 mm

Screw Finish

Black Oxide

Seating Torque

0.92 Nm

Number of Screws

2 ea

Performance Specifications

Static Torque

40 lb-in

Angular Misalignment

1.5°

Dynamic Torque Non-Reversing

20 lb-in

Parallel Misalignment

0.004 in

Dynamic Torque Reversing

10 lb-in

Axial Motion

0.010 in

Torsional Stiffness

120 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.)

0.0330

UPC

63452906309

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.

CERTIFICATIONS/STANDARDS
ISO 9001:2015

Certified

Conflict Minerals

Compliant

RoHS3

Compliant

REACH

Compliant

CUSTOMER REVIEWS

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