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4'' Stem ESD Rigid Caster

4'' anti-static rigid stem-mount caster
Farnham: 700
Los Angeles: 437
Lawrenceville: 632
  • Electric conductivity (ESD) caster
  • 4 inches (100 mm) diameter wheel
  • 250 pounds (113 kg) loading capacity
  • 2.5 mph maximum speed

Electric conductivity (ESD) 4 inches rigid stem caster with a loading capacity of 250 pounds (113 kg) and a maximum speed of 2.5 mph. The stem-mount is made with a rubber bushing that expands into a 28 mm steel pipe to keep the wheel in place. You will need to secure the wheel by placing it on a connector with WF-U5/16 U-Bolt (included with the caster).

Bolt M12 (12 mm) Length 2 1/4" (57.15 mm)

See the Installation Steps tab for more information on how to install EW-4EF casters.

Use the F-BUS component when this caster is used with the EP-96-ST pipe.

4 inches casters are made for:

  • More or less long trips (30 to 50 feet)
  • Frequent use (20 to 50 times a day)
  • Carts weighting less than 400 pounds
  • Narrow carts (between 16 and 24 in. wide)

EW-4EF has a non-electric conductivity version: W-4EF

All casters are equipped with a precision ball bearing.

More Information
Box Quantity30
Length4 in (102 mm)
Height5 1/8 in (130 mm)
Weight (kg/lbs)1.4 lb (0.65 kg)
Box DimensionsCardboard box of 11 X 9 X 5 in (279 mm X 229 mm X 127 mm)
Primary MaterialThermoplastic Rubber (TPR)
Temperature Resistance-22°F to 158°F (-30°C to 70°C)
Electric Conductivity (ESD)Yes (10^6– 10^8)
Loading Capacity250 lb (113 kg)
  1. Ensure you have the following parts:
    • 1x EW-4EF
    • 1x WF-U5/16 U-bolt - included with the caster.
    • 2x WF-U5/16 nuts - included with the caster.
    • 1x WF-U5/16 metal plate - included with the caster.
    • 1x 28mm pipe of your choice
    • 1x Ratchet Wrench 3/4 in.
    • 1x Ratchet Wrench 5/16 in.
  2. Ensure that the structure is levelled when supported by the pipes that will be wheeled. Otherwise, the height difference might cause the structure to sway.
  3. Flip the structure for a better access to the bottom pipes.
  4. Unscrew the 3/4 in. bolt underneath the plate of the caster using the wrench.
  5. Tighten the nut located on the top of the stem for the rubber bushing to expend until it barely fits inside the pipe.
  6. Insert the wheel rod completely inside the pipe. Help yourself with a mallet if needed.
  7. Tighten the same 3/4 in. bolt using the wrench 3/4 and let the wheel rotate until it grips firmly inside the pipe.
  8. Place the WF-U5/16 metal plate between the pipe and the caster and aligned it with the corresponding openings.
  9. Insert the WF-U5/16 U-bolt in the openings in order to trap the tube inside the U-bolt.
  10. Tighten the WF-U5/16 nuts with the U-bolt using the wrench 5/16.

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