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4″x1.25″ – Spring Loaded Light Duty Rigid Caster – Soft Gray Non-Marking Rubber
$55.46
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)
Technical Specifications
Overall Height
5-7/16"
Axle Diameter
3/8"
ISO 9001
ISO 9001:2015 Certified
Maximum Capacity (lbs)
135 lbs
Durometer
65A - 70A
Color
Gray
Wheel Diameter
4"
Wheel Width
1.25"
Spring Constant
252 lbs/in
Spring Travel
0.41"
Non-Marking
Yes
Weight
4 lbs
Description
The Spring-Loaded Model 3 brings suspension protection to light-duty electronics carts and shock-sensitive equipment. Built on the proven Model 3 platform, this caster adds a spring mechanism between wheel and mounting plate, absorbing floor impacts that would otherwise transmit directly to sensitive cargo. The gray non-marking RF rubber wheels provide additional compliance—rubber’s natural shock absorption combines with spring suspension for maximum protection of delicate electronics, instruments, and laboratory equipment. Precision sealed ball bearings ensure smooth rolling, while integrated plastic thread guards protect bearings and caster legs from fiber and hair binding common in office and laboratory environments.
Available in 4-inch and 5-inch wheel diameters with 1.25-inch tread width. The 4-inch mode performs optimally with 120-240 lb total equipment loads ; the 5-inch model handles 165-305 lb loads in the optimal deflection range. Both configurations use the standard Model 3 mounting plate and bolt pattern. Swivel and rigid options available. An optional face contact brake (FCB) adds wheel lock capability—the red plastic pedal behind the wheel engages and disengages easily by foot.
FAQ
Q: What equipment is this caster designed for?
A: Light-duty electronics carts, AV equipment, instrument transport, server peripherals, laboratory carts, and shock-sensitive cargo. The 4-inch model is optimal for 120-200 lb total loads; the 5-inch model for 165-265 lbs.
Q: How does the spring suspension work?
A: The spring compresses under load and during impacts, converting sudden shocks into controlled deflection. The 4-inch model provides up to 0.50 inches of travel (bottoms out at 130 lbs); the 5-inch model provides up to 0.66 inches of travel (bottoms out at 190 lbs). For best performance, static load should compress the spring 25-40% of available travel.
Q: Why only RF rubber wheels?
A: The gray RF rubber complements spring suspension; rubber’s inherent compliance adds a second layer of shock absorption while providing non-marking floor protection. For electronics environments, this combination maximizes cargo protection.
Q: What do the plastic thread guards do?
A: Thread guards create a barrier around the bearing and swivel leg, preventing hair, fibers, string, and debris from wrapping around moving parts. Particularly valuable in office, laboratory, and data center environments.
Q: Can I add wheel brakes?
A: Yes. The optional face contact brake (FCB) features a red plastic pedal behind the wheel. Step down to lock, tap to release.
Q: What mounting plate does this use?
A: Standard Model 3 mounting plate and bolt hole pattern.
Q: Are rigid (fixed) casters available?
A: Yes. Both swivel and rigid configurations available in 4-inch and 5-inch wheel sizes.
Q: How does this compare to standard Model 3 casters with rubber wheels?
A: Standard rubber wheels provide some shock absorption through tread deformation—but only 0.03-0.05 inches of compliance. The Spring-Loaded Model 3 adds 0.50-0.66 inches of controlled spring travel, reducing transmitted shock by 60-70% compared to rigid casters. For equipment exceeding the optimal load range (above 265 lbs), the suspension still functions but with reduced impact capacity; consider the Model 9 spring caster for heavier loads.
Q: What floor types work best?
A: Smooth, hard floors—sealed concrete, tile, epoxy, raised data center flooring. RF rubber provides excellent traction and floor protection on these surfaces. Not recommended for carpet, outdoor use, or rough industrial floors.d range across four casters, which keeps each caster in the 25-40% static deflection zone where suspension performance is best.
Q: What’s the difference between this and the Model 9 spring caster?
A: The Model 9 is a medium-duty suspension caster rated for 550 lbs per caster with 1.13 inches of spring travel; designed for server racks, aerospace components, and medical imaging equipment. The Spring-Loaded Model 3 is sized for lighter electronics carts and instruments where the larger Model 9 would be oversized.
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
If you have any questions about your measurements, please call 800-501-3808
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