Name: 4" Gray Soft Rubber Swivel Wheel - Model K3
SKU: K3RF4X1.25-S3
Availability: InStock

2 +

Volume Pricing on Inquiry. Call us: 800-501-3808

Most of our casters are assembled and dispatched within 24-48 hours.

Click to Download CAD Files

Download 2D File

4″ Gray Soft Rubber Swivel Wheel – Model K3

$30.31

PN: K3RF4X1.25-S3

In Stock

Please select any add ons you require for your caster and if you are selecting multiple option types, add all of the quantity for the first choice and then make your selections for the second, third, fourth, etc… choices. (Example: 2 With Brakes and 2 Without Brakes)

SKU: K3RF4X1.25-S3Categories: Plate Casters, Swivel Casters, Model K3 - up to 300 lbs each - Plate Size 3-1/8" x 4-1/8", K3 Swivel

Technical Specifications

Wheel Diameter

Caster City Recommendation

Ollie Recommends!

Non-Marking

Yes

Durometer

75A ± 5

ISO 9001

ISO 9001:2015 Certified

Fork Finish

Zinc Coating

Wheel Width

1.25"

Wheel Bearing

Precision Sealed Ball Bearings

Maximum Capacity (lbs)

200 lbs

Overall Height

5-1/8"

Swivel Radius

3-1/4"

Color

Gray

Zinc Brake Codes

PTB, TB

Lube Axle Code

Plate Fastener Type

Mounting Plate, Top Plate

Plate Mounting Type

Top Plate

Weight

2 lbs

Description

4″ Gray Soft Rubber Precision Sealed Ball Bearings. Shown with 5″ Wheel.

Plate Caster Model K3 is made from stamped steel frames with a zinc plating to resist corrosion. This plate caster uses a ⅜” diameter axle and the swivel caster raceway is held together by a ½” diameter rivet. Plate Caster Model K3 caster brackets have two rows of ball bearings rotating on raceways for smoother swiveling. There is a solid cover over the swivel raceways to shield them from dirt and dust. Plate caster Model K3 uses a larger plate which is intended to make fabrication easier since it also uses a larger bolt size which is easier to handle. This plate caster performs best if you limit the load to no more than 1200 lbs on a set of 4 Model K3 casters.

This caster comes with a gray, non-marking, injection molded thermoplastic rubber tire mechanically bonded to a polyolefin center. This institutional caster wheel was designed to use a ⅜” axel and the tread width of the tire is 1-¼”.This soft gray rubber caster wheel comes with a durometer of 90-95A, making it excellent for indoor usage on smooth surfaces to reduce noise and vibration. This caster wheel has a sealed precision ball bearing protected with plastic spanner bushings that reduce the inner diameter of the axle, act as thread guards, and guard the bearing from indirect and direct moisture exposure. Injection molded wheels such as this soft rubber swivel wheel are not the best choice for standing loads that are moved infrequently.

In a hospital kitchen where food service carts need to roll quietly without scuffing the floors, Caster City’s Soft Gray Rubber Caster Wheel keeps things moving smoothly. Its gray non-marking thermoplastic rubber tread, bonded to a polyolefin center, absorbs shocks to protect both the cart and delicate cargo, while rolling over small debris with ease. With precision sealed ball bearings that need no maintenance, this wheel cuts down on noise and vibration, making it a great fit for places like pharmaceutical labs, hospitals, and food service setups where clean, quiet operation is a must.

This wheel handles exposure to chemicals and solvents without breaking a sweat, but it’s not built for heavy-duty abuse—think overloading, rough floors, or leaving it standing under weight for too long, as that can lead to flat spots. If you’re pushing it manually, cut the load capacity by 50% to make it easier to move, and go for the largest diameter you can to keep things rolling smoothly. Designed for dry factory floors, the Soft Gray Rubber Caster Wheel protects pricey surfaces and prolongs equipment life, but watch out for heat buildup or harsh impacts that might affect the bonding over time.

FAQ

FAQ – Model K3 Swivel Caster with RF Soft Gray Rubber Wheel

What is the Model K3 caster with RF Soft Gray Rubber Wheel designed for?
The Model K3 caster with RF Soft Gray Rubber Wheel is designed for institutional environments like hospitals, schools, and offices, where quiet operation, floor protection, and easy maneuverability are essential.

What sizes are available for the RF Soft Gray Rubber Wheel in the Model K3 caster?
The RF Soft Gray Rubber Wheel for the Model K3 caster is available in a 1.25″ width with diameters of 3″, 4″, and 5″, providing options for different clearance and mobility needs.

What bearing type comes with the RF wheel in the Model K3 caster?
The RF wheel in the Model K3 caster comes exclusively with precision sealed ball bearings, ensuring smooth, maintenance-free operation.

What are the main benefits of the RF Soft Gray Rubber Wheel in institutional settings?
The RF wheel offers a quiet, shock-absorbing ride that protects floors, reduces noise, and minimizes vibration, making it ideal for sensitive environments like hospitals and schools.

How does the Model K3 caster differ from industrial casters?
The Model K3 is an institutional caster, designed for lighter-duty use with a focus on aesthetics, noise reduction, and floor protection, unlike industrial casters built for heavy loads and rough conditions.

What are the thread guards on the RF wheel, and why are they important?
The RF wheel includes thread guards to prevent debris like hair or threads from entangling in the wheel, which is crucial for maintaining cleanliness in environments like hospitals.

Can the Model K3 caster with RF wheel be used in wet environments?
The RF wheel can handle light exposure to water, but the caster frame’s material must be considered. For wet settings, a stainless steel frame is recommended.

What is the durometer of the RF Soft Gray Rubber Wheel, and why does it matter?
The RF wheel has a 75A durometer, providing softness for shock absorption and floor protection, which is key in institutional settings where noise and vibration control are priorities.

How do I choose the right diameter for the RF wheel in the Model K3 caster?
Smaller diameters (3″) are better for low-clearance equipment, while larger ones (5″) handle uneven floors more easily. Select based on your equipment’s height and floor conditions.

What maintenance does the RF wheel in the Model K3 caster require?
The RF wheel’s precision sealed ball bearings require no maintenance, ensuring smooth, long-term performance with minimal upkeep.

What is the mounting plate size for the Model K3 caster?
The Model K3 caster uses a larger mounting plate of 3 1/8″ x 4 1/8″, providing a secure and stable attachment for equipment.

Our #1 goal is to help you find the best caster and wheels for your needs. If you need help finding the right casters, contact our team of professionals. You can also customize many of our casters with a variety of options such as swivel locks, wheel brakes and zerk fittings. We ship our products from assembly plants in Georgia, Pennsylvania, Virginia, Texas, Nevada and Canada. Whether you’re a one-man shop or a global giant, we can provide you with: We specialize in Business to Business, however, consumer orders are gladly accepted and we can provide you with:

Fastest Lead Time in the Industry
Caster performance data.
Comparative data.
Customized caster solutions.
Help with caster solutions.
Case studies by industry or application.
Manufacturer and Distributor of over $25 million dollars in Finished Component Parts
Majority of Orders Processed and Shipped in 2 Days or Less

Call us during the design phase of your project, we can help you avoid costly modifications once fabrication has started. We guarantee what we recommend.