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Type DC elements can be used as either pressure actuated clutches or brakes. They are available in single and multiple disc designs.

Pressurizing the cylinder causes the piston to clamp the friction disc assemblies between clamping plates. External springs ensure positive disengagement.

Type DC elements are available in five basic disc sizes with static torque ratings to 2,061,000 lb.in (233.000 N.m). Element sizes are indicated by the number of friction discs and by the disc diameter in inches. For instance, size 225DC has two friction discs 25 inches in diameter.
Unit of Measure

Features

N/A Favorable torque to size ratio.
DC type elements are physically smaller than most other type clutches and brakes with the same torque capacity.

Low inertia friction disc assembly.
Reduces the overall inertia that must be started or stopped.

Optional split friction discs.
Allows removal of friction discs without disturbing other components of drive system in mid-shaft element arrangement.

Long wearing, self lubricating PolyPak* seals.
Eliminates premature twisting failure and requires no external lubrication.

Where Used

N/A

  • Power Presses
  • Tension Brakes
  • Emergency Stop Brakes on Unwind Stands

Specifications

Dimension D1

 N/A 18.00 in457 mm

W4

 N/A 25.00 in635 mm

Dimension D46

 N/A 0.00 in0 mm

Dimension D31

 N/A 2.45 in62 mm

Dimension D44

 N/A 0.25 in6 mm

Dimension H16

 N/A 16.50 in419 mm

H Number

 N/A 4

H Size

 N/A 1/2-13NC-2

Bolt Circle

 N/A 17.50 in445 mm
Dimension J1 N/A 44.750 in1136.7 mm
Dimension J12 N/A 36.375 in923.9 mm
Dimension J23 N/A 44.86 in1139 mm

Dimension O2

 N/A 3/4-14 NPT

Number of Friction Discs

 N/A 4

Size

 N/A 438DC

Dynamic Torque Rating at 75 psi (5.2 bar)

 N/A 2240000 lb·in252900 Nm

Maximum Speed of Disc

 N/A 950 rpm

Maximum Speed of Element

 N/A 450 rpm

Housing (Inertia)

 N/A 2355 lb·ft²99.24 kg·m²

Disc & Gear (Inertia)

 N/A 1112 lb·ft²46.86 kg·m²

Disc and Gear (Weight)

 N/A 1424 lb646 kg

Housing (Weight)

 N/A 1817 lb824 kg

Gear Part Number

 N/A 416461

Minimum Bore

 N/A 8.50 in216 mm

Maximum Bore

 N/A 10.25 in260 mm

Manufacturer

 N/A Eaton-Airflex

Actuation

 N/A Air (DC)

Note

N/A Basic part number only. Gear not included.
Some high torque applications of three and four disc elements require additional support on the cylinder side of the unit. Contact your local Airflex representative for more details.

  • 1 Tolerance +0.000/-0.003 in (+0.00/-0.08 mm)
  • 2 Tolerance +0.003/-0.000 in (+0.08/-0.00 mm)
  • 3 Maximum diameter of "as cast" surfaces.