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MJS33-12-A JD21/33-85B MJS33-11-A

In stock
Ruland MJS33-12-A JD21/33-85B MJS33-11-A, 12mm x 11mm Jaw Coupling Bundle, Aluminum, Set Screw Style Hubs, 33.3mm OD, 44.5mm Length

PRODUCT SPECIFICATIONS

This Ruland jaw coupling bundle contains MJS33-12-A, JD21/33-85B, and MJS33-11-A. To make a complete assembly you must specify two hubs and one spider. All parts have an OD of 33.3mm (1.313") and assembled length of 44.5mm (1.750"). MJS33-12-A is a set screw hub with a 12mm bore. JD21/33-85B is a 85 Shore A spider. MJS33-11-A is a set screw hub with a 11mm bore. The dampening characteristics of this zero-backlash jaw coupling reduce settling time and shock loads making it well suited for systems that have agressive acceleration/deceleration profiles. Ruland jaw couplings have a balanced design for reduced vibration at speeds up to 8,000 RPM. Hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. Hubs are manufactured in our Marlborough, MA factory under strict controls using proprietary processes from bar stock that is sourced exclusively from North American mills. All components in this bundle are RoHS3 and REACH compliant.

PRODUCT SPECIFICATIONS

Dimensions

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

12 mm

Small Bore (B2) Smaller inner diameter. Should match nominal shaft diameter.

11 mm

Outer Diameter (OD)

33.3 mm

Length (L)

44.5 mm

CERTIFICATIONS/STANDARDS
ISO 9001:2015

Certified

Conflict Minerals

Compliant

RoHS3

Compliant

REACH

Compliant

Dimensions

Bore (B1)

12 mm

B1 Max Shaft Penetration

15.0 mm

Outer Diameter (OD)

1.313 in (33.3 mm)

Bore Tolerance

+0.03 mm / -0.00 mm

Hub Width (LH)

15.00 mm

Length (L)

1.750 in (44.5 mm)

Recommended Shaft Tolerance

+0.000 mm / -0.013 mm

Fastening Hardware

Forged Set Screw

M4

Number of Screws

2 ea 90° apart

Screw Material

Alloy Steel

Screw Finish

Black Oxide

Hex Wrench Size

2.0 mm

Seating Torque

2.2 Nm

Performance Specifications

Torque Specifications

Torque ratings vary with insert selection

Misalignment

Misalignment ratings vary with insert selection

Maximum Speed

8,000 RPM

Moment of Inertia

5.992 x 10-6 kg-m2

Full Bearing Support Required?

Yes

Recommended Inserts

JD21/33-98R, JD21/33-92Y, JD21/33-85B

Zero-Backlash?

Yes

Balanced Design

Yes

Fail Safe?

Yes

Additional Information

Weight (lbs)

0.082400

Temperature

-10°F to 180°F (-23°C to 82°C)

Material Specification

2024-T351 Aluminum Bar

Finish

Bright

Finish Specification

Bright, No Plating

Manufacturer

Ruland Manufacturing

Recommended Gap Between Hubs

0.030 in (0.75 mm)

Country of Origin

USA

UPC

634529068113

UNSPC

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. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the nominal torque of the spiders. 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 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.

Installation Instructions

Installation Instructions

  1. Align the bores of the MJS33-12-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 M4 screw(s) on the first hub to the recommended seating torque of 2.2 Nm using a 2.0 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.

Installation Video

Dimensions

Outer Diameter (OD)

1.313 in (33.3 mm)

Performance Specifications

Rated Torque

18 in-lb (2.03 Nm)

Angular Misalignment

1.0°

Peak Torque

36 in-lb (4.1 Nm)

Parallel Misalignment

0.006 in (0.15 mm)

Torsional Stiffness

13.3 lb-in/Deg (1.51 Nm/Deg)

Moment of Inertia

0.00267 lb-in2 (7.799 X 10-7 kg-m2)

Axial Motion

0.030 in (0.76 mm)

Maximum Speed

8,000 RPM

Full Bearing Support Required?

Yes

Zero-Backlash?

Yes

Additional Information

Weight (lbs)

0.013800

Temperature

-10°F to 180°F (-23°C to 82°C)

Material Specification

Polyurethane 85 Shore A BLUE

Finish Specification

Plain

Manufacturer

Ruland Manufacturing

UPC

634529069035

Country of Origin

USA

Tariff Code

8483.60.8000

UNSPC

31163011

Recommended Gap Between Hubs

0.030 in (0.75 mm)

Product Notes

Note 1

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

Note 2

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. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the nominal torque of the spiders. Keyways are available to provide additional torque capacity in the shaft/hub connection when required. Please consult technical support for more assistance.

Prop 65

This product does not require a warning.

Installation Instructions

Installation Instructions

  1. Align the bores of the jaw coupling hubs on the shafts that are to be joined and determine if the misalignment parameters are within the limits of the coupling.(Angular Misialignment: 1.0 deg, Parallel Misalignment: 0.006 in (0.15 mm), Axial Motion: 0.03 in (0.76 mm))
  2. Fully tighten the screw(s) on the first hub to the recommended seating torque using a hex torque wrench.
  3. Insert a spider into the jaws of the first 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.

Installation Video

Dimensions

Bore (B1)

11 mm

B1 Max Shaft Penetration

15.0 mm

Outer Diameter (OD)

1.313 in (33.3 mm)

Bore Tolerance

+0.03 mm / -0.00 mm

Hub Width (LH)

15.00 mm

Length (L)

1.750 in (44.5 mm)

Recommended Shaft Tolerance

+0.000 mm / -0.013 mm

Fastening Hardware

Forged Set Screw

M4

Number of Screws

2 ea 90° apart

Screw Material

Alloy Steel

Screw Finish

Black Oxide

Hex Wrench Size

2.0 mm

Seating Torque

2.2 Nm

Performance Specifications

Torque Specifications

Torque ratings vary with insert selection

Misalignment

Misalignment ratings vary with insert selection

Maximum Speed

8,000 RPM

Moment of Inertia

6.002 x 10-6 kg-m2

Full Bearing Support Required?

Yes

Recommended Inserts

JD21/33-98R, JD21/33-92Y, JD21/33-85B

Zero-Backlash?

Yes

Balanced Design

Yes

Fail Safe?

Yes

Additional Information

Weight (lbs)

0.083400

Temperature

-10°F to 180°F (-23°C to 82°C)

Material Specification

2024-T351 Aluminum Bar

Finish

Bright

Finish Specification

Bright, No Plating

Manufacturer

Ruland Manufacturing

Recommended Gap Between Hubs

0.030 in (0.75 mm)

Country of Origin

USA

UPC

634529130643

UNSPC

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. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the nominal torque of the spiders. 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 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.

Installation Instructions

Installation Instructions

  1. Align the bores of the MJS33-11-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 M4 screw(s) on the first hub to the recommended seating torque of 2.2 Nm using a 2.0 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.

Installation Video

CUSTOMER REVIEWS

MJS33-12-A JD21/33-85B MJS33-11-A
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