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MJCC57-25-A

$127.87
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1 $127.87
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Ruland MJCC57-25-A, 25mm Jaw Coupling Hub, Aluminum, Clamp Style With Keyway, 57.2mm OD, 28.7mm Length

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PRODUCT SPECIFICATIONS

Ruland MJCC57-25-A is a clamp zero-backlash jaw coupling hub with a 25mm bore, 8mm keyway, 57.2mm OD, and 28.7mm length. It is a component in a three-piece design consisiting of two aluminum hubs and an elastomeric insert called the spider creating a lightweight low inertia coupling capable of speeds up to 8,000 RPM. This three-piece design allows for a highly customizable coupling that easily combines clamp or set screw hubs with inch, metric, keyed, and keyless bores. Spiders are available in three durometers allowing the user to tailor coupling performance to their application. Ruland jaw couplings have a balanced design for reduced vibration at high speeds. Hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. MJCC57-25-A is machined from bar stock that is sourced exclusively from North American mills and is RoHS3 and REACH compliant. It is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.

PRODUCT SPECIFICATIONS

Dimensions

Bore (B1) Larger inner diameter. Should match nominal shaft diameter.

25 mm

Keyway (K)

8 mm

B1 Max Shaft Penetration The maximum depth the shaft can penetrate into Bore B1.

28.7 mm

Outer Diameter (OD)

2.250 in (57.2 mm)

Bore Tolerance Variance in finished bore range before installation.

+0.03 mm / -0.00 mm

Hub Width (LH)

28.70 mm

Length (L)

3.150 in (80.0 mm)

Recommended Shaft Tolerance Acceptable variance in nominal shaft diameter before performance loss.

+0.000 mm / -0.013 mm

Fastening Hardware

Forged Clamp Screw Inch or metric socket head cap screw size.

M6

Number of Screws

1 ea

Screw Material

Alloy Steel

Screw Finish Surface finish and treatments on supplied hardware.

Black Oxide

Hex Wrench Size Wrench size that fits the screw head to tighten or loosen the screw.

5.0 mm

Seating Torque Torque required to install supplied hardware. Use torque wrench for accurate seating torque.

16 Nm

Performance Specifications

Torque Specifications Torque is dependent on the insert selected. Please see "Recommended Inserts" to select the correct insert for your application.

Torque ratings vary with insert selection

Misalignment Misalignment is dependent on the insert selected. Please see "Recommended Inserts" to select the correct insert for your application.

Misalignment ratings vary with insert selection

Maximum Speed

8,000 RPM

Moment of Inertia

9.088 x 10-5 kg-m2

Full Bearing Support Required? Full bearing support is a bearing in close proximity to both sides of the coupling to prevent axial loads that could result in rapid coupling failure.

Yes

Recommended Inserts Any of these inserts will match this coupling hub.

JD36/57-98R, JD36/57-92Y

Zero-Backlash? Zero-backlash ensures there is no loss of motion during operation.

Yes

Balanced Design The balanced design allows for reduced vibration at high RPMs.

Yes

Fail Safe? If the spider fails tenons will interlock preventing the loss of power transmission.

Yes

Additional Information

Weight (lbs)

0.398100

Temperature Minimum and maximum operating temperature. Operating temperature includes ambient temperature plus or minus factors such as system heat generated during operation, washdown, vacuum, etc...

-10°F to 180°F (-23°C to 82°C)

Material Specification

2024-T351 Aluminum Bar

Finish

Bright

Finish Specification Surface finish specifications.

Bright, No Plating

Manufacturer

Ruland Manufacturing

Recommended Gap Between Hubs The recommended installation gap between the two hubs.

0.050 in (1.25 mm)

Country of Origin

USA

UPC

634529116333

UNSPC Code used to identify products to standardize nomenclature around the world.

31163011

Tariff Code

8483.60.8000

Product Notes

Note 1

Stainless steel hubs are available upon request.

Note 2

Performance ratings are for guidance only. The user must determine suitability for a particular application.

Note 3

Torque ratings for the couplings are based on the physical limitations/failure point of the spiders. Under normal/typical conditions the hubs are capable of holding up to the nominal torque of the spiders. Please consult technical support for more assistance.

Prop 65 Required for the US State of California only.

WARNING This product can expose you to the chemical Ethylene Thiourea, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

CERTIFICATIONS/STANDARDS
ISO 9001:2015

Certified

Conflict Minerals

Compliant

RoHS3

Compliant

REACH

Compliant

Installation Instructions

  1. Align the bores of the MJCC57-25-A jaw coupling hubs on the shafts that are to be joined and determine if the misalignment parameters are within the limits of the coupling. (See spider for misalignment parameters.)
  2. Fully tighten the M6 screw(s) on the first hub to the recommended seating torque of 16 Nm using a 5.0 mm hex torque wrench.
  3. Insert a spider into the jaws of one hub until the raised points contact the base of the hub.
  4. Insert the jaws of the second hub into the spider openings until the raised points contact the base of the second hub. Some force will be required to insert the second hub. This is normal.
  5. Assure that a gap is maintained between the two hubs so there is no metal to metal contact. Fully tighten the screw(s) on the second hub to the recommended seating torque.

CUSTOMER REVIEWS

MJCC57-25-A
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