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Custom made to order. All sales final.
Each Hamilton product is custom manufactured for your order and ships in about 4-6 weeks. Please confirm all specs before checkout, since made-to-order items aren't eligible for returns, exchanges or refunds. Need help? Call 844-439-4335 or email info@casterhq.com and we'll verify fit for you.
Unleash superior mobility with the R-ZFHS-4MB Hamilton Spinfinity Maintenance-Free ZFHS Series Rigid Caster. This robust and durable caster is expertly engineered to deliver top-notch performance in even the most demanding of industrial environments. Its durable design ensures an exceptional, maintenance-free lifespan.
The R-ZFHS-4MB features a robust 4" x 2" Cast Iron Metal Wheel, designed to withstand heavy loads and rugged use. The metal wheel provides a sturdy foundation, ensuring long-lasting durability and dependability. It's an ideal choice for heavy-duty industrial and commercial applications where reliability is key.
Equipped with 3/4" Sealed Precision Ball Bearings, this Hamilton Spinfinity Rigid Caster guarantees smooth, effortless movement. The sealed bearing design safeguards against dust and debris, promising a long-lasting and maintenance-free operation.
Experience top performance and an extended lifespan with our maintenance-free R-ZFHS-4MB Hamilton Spinfinity Rigid Caster. Upgrade your equipment's mobility and enhance your overall productivity today!
Order processing
In stock. Orders placed before 12pm CT (Mon–Fri) typically ship the same or next business day from our Mansfield, TX warehouse.
Shipping method
Smaller orders ship parcel (UPS/FedEx Ground). Heavy or bulk quantities consolidate to LTL freight. The method and final cost are shown before payment, so there are no post-checkout adjustments.
Payment & procurement terms
New to CasterHQ? Open an account or request terms and send your resale or tax-exemption certificate before ordering so it is applied at checkout.
Volume pricing & quotes
Quantity discounts apply automatically — no codes needed. For large, recurring, or custom requirements, request a bulk quote and our team will confirm pricing, lead time, and total landed freight upfront.
Returns & warranty
Stock items carry a 30-day return policy in unused, resalable condition. Made-to-order and custom items are non-returnable once production starts. All products carry the manufacturer's warranty against defects.
Central & Southern U.S.: typically 1–2 business days
East & West Coasts: typically 2–3 business days
Remote areas and freight deliveries may take longer.
For pallet freight, scheduled releases, or blanket purchase orders, contact our team and we'll confirm total landed cost before you commit. Direct line: 844-439-4335.
When it comes to heavy-duty applications, the R-ZFHS-4MB Hamilton Spinfinity Maintenance-Free ZFHS Series Rigid Caster stands out for its unparalleled performance and durability.
This caster is expertly engineered to cater to demanding industrial and commercial environments. Its durable design ensures optimal service life with minimal maintenance, making it a cost-effective solution for enhancing mobility in a variety of settings.
Featuring a robust 4" x 2" cast iron metal wheel, the R-ZFHS-4MB is capable of withstanding substantial loads while ensuring smooth operation. This wheel material is highly resistant to wear and tear, promising long-term reliability even under the toughest of conditions.
At the heart of this caster lies the 3/4" Sealed Precision Ball Bearings that enable effortless movement and superior load handling. The bearings are sealed to protect against dust and debris, offering you a maintenance-free operation.
With the R-ZFHS-4MB Hamilton Spinfinity Maintenance-Free ZFHS Series Rigid Caster, you don't just get a product - you get a promise of performance, durability, and enhanced productivity. Don't let outdated or subpar casters hold you back. Upgrade your equipment's mobility and enjoy improved operational efficiency today!
This Hamilton R-ZFHS-4MB 4" x 2" Cast Iron Rigid Sealed Caster is rated to 1000 lbs per caster. Size a set by dividing the total load by the number of casters, and for uneven floors assume 3 of 4 casters carry the load. Keep continuous-use loads within about 75-80% of the rating.
This caster runs a Cast Iron wheel with a 2" tread width. Steel / iron wheels give maximum capacity and durability on smooth, hard industrial floors and tolerate heat.
This caster uses a top-plate mount with a 4-1/2" x 6-1/2" plate. Measure your existing mounting holes before ordering; if you are replacing casters, match the bolt pattern - most standard patterns interchange across brands.
This is a Rigid caster. Rigid casters track straight for directional stability. For most mobile equipment we recommend 2 swivel + 2 rigid, or 4 swivel with at least 2 brakes.
The Cast Iron wheel performs best on smooth, hard industrial floors. For non-marking or clean-environment needs, ask us about matching tread options.
The overall height (floor to top of plate or stem) is 5-5/8". Account for it when checking equipment clearance, dock height, and ergonomic working height.
We accept purchase orders and offer Net 30 on approved accounts, ACH, and all major cards, plus tax-exempt ordering with a resale or exemption certificate. Volume discounts apply automatically; request a bulk quote for large or recurring orders. Stock items carry a 30-day return policy in unused condition (made-to-order items are non-returnable once production starts).
Application guidance for load margin, wheel materials, and swivel construction. Confirm ratings against your duty cycle, floor, and temperature before final spec.
Start with total system weight (payload + structure + fixtures), divide by casters that actually share the load, and keep continuous working load per caster at or below roughly 75% of catalog capacity (~25% margin). Heavy-duty kingpinless frames are often used on uneven floors, docks, and towed trains where dynamic load transfer is common — do not assume perfect four-caster share. If impact, drop-offs, or shock loading is expected, treat the margin as a floor, not a stretch goal, and confirm capacity at the wheel diameter and tread you select on this PDP. Dynamic and side loads are separate from static catalog ratings; call out towing or AGV duty when you quote so we can sanity-check the configuration.
Stay with polyurethane when floors are relatively smooth, temperatures stay inside the PU service window, and you want floor protection plus rollability. Move to phenolic, glass-filled nylon, or other high-temp / high-hardness options when heat, certain chemicals, or very high point loads push past what standard PU can sustain. Kingpinless construction solves swivel durability under thrust; it does not raise the wheel’s temperature or chemical limit. Use the wheel material and temperature fields on this product (and sibling SKUs) to match the environment — heat duty and side-thrust duty are independent selection axes.
Kingpin swivels concentrate clamping and much of the axial stack through one pin. Towing hitches, AGV corrections, and side scrub introduce lateral and moment loads that work that pin and the race faces harder than hand-pushed carts. Typical early wear modes include kingpin stretch or hole elongation, race brinelling, and increasing swivel play. Kingpinless designs replace that single-pin stack with a machined or forged raceway that carries thrust through the race path, which is why they are the usual spec for powered towing and higher side-load industrial carts. Pair kingpinless swivels with a wheel and bearing package rated for the same duty — the swivel upgrade alone does not fix an undersized tread or bearing.
$107.00
| Identification | |
|---|---|
| Part Number / SKU | R-ZFHS-4MB |
| Replacement Wheel Part No | W-420-MB-1/2 |
| Core | |
| Load Capacity | 1000 lbs |
| Wheel Diameter | 4" |
| Wheel Width | 2" |
| Floor to top of mounting plate (or stem shoulder).Overall Height (OAH)Floor to top of mounting plate (or stem shoulder). | 5-5/8" |
| Rig Type | Rigid |
| Brake | No Brake |
| Mounting | |
| Mount Style | Plate |
| Plate Size | 4-1/2" x 6-1/2" |
| Recommended Mounting Bolt | 1/2" |
| Wheel | |
| Wheel Material | Cast Iron |
| Compliance | |
| Buy American | Yes |
Your selection is highlighted. Every option shares its wheel size and mount; a Direct fit tag means the same mounting plate — a drop-in replacement. Step up or down in load rating within the same duty class, all in stock.
| Casters (in stock) | Load capacity | Wheel | Type | Overall height | Price | |
|---|---|---|---|---|---|---|
| 800 lbsLighter duty | 4" × 2"Phenolic | Swivel | 5-5/8" | $25.00 | View → | |
| 800 lbsLighter duty | 4" × 2"Phenolic | Swivel | 5-5/8" | $29.00 | View → | |
| 1000 lbs | 4" × 2"Cast Iron | Rigid | 5-5/8" | $107.00 | Viewing | |
| 1000 lbsSame capacity | 4" × 2"Polyurethane | Swivel | 5-5/8" | $183.00 | View → | |
| 1000 lbsSame capacity | 4" × 2" | Rigid | 5-5/8" | $10.00 | View → |
