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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.
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
Because of its size and weight, this item typically ships LTL freight on a pallet. Smaller add-on items may ship parcel. Freight cost is calculated by destination and shown before payment, or quoted for large orders.
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.
This Hamilton S-MDD-12DH 12" x 3" Duralast Swivel Dual Wheel Caster – 6300 lb is rated to 6300 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 Polyurethane wheel with a 3" tread width. Polyurethane protects finished floors, rolls quietly, and resists most chemicals while carrying heavy loads.
This caster uses a top-plate mount with a 8-1/2" x 8-1/2" 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 Swivel caster. Swivel casters rotate 360 degrees for full maneuverability. For most mobile equipment we recommend 2 swivel + 2 rigid, or 4 swivel with at least 2 brakes.
Rated for -5°F to 160°F. Operating outside the rated range can reduce wheel life and load capacity, so match it to your environment (wash-down, freezer, oven-adjacent, etc.).
The Polyurethane wheel performs best on smooth to semi-smooth floors including sealed concrete, tile, and epoxy. For non-marking or clean-environment needs, ask us about matching tread options.
The overall height (floor to top of plate or stem) is 15-1/2". 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).
$1,878.00
| Identification | |
|---|---|
| Part Number / SKU | S-MDD-12DH |
| Replacement Wheel Part No | W-1230-D-1-1/4 |
| Core | |
| Load Capacity | 6300 lbs |
| Wheel Diameter | 12" |
| Wheel Width | 3" |
| Floor to top of mounting plate (or stem shoulder).Overall Height (OAH)Floor to top of mounting plate (or stem shoulder). | 15-1/2" |
| Rig Type | Swivel |
| Brake | No Brake |
| Horizontal distance from the swivel centerline (kingpin) to the wheel axle.Swivel Lead (Offset)Horizontal distance from the swivel centerline (kingpin) to the wheel axle. | 3-1/4" |
| Number of Wheels | 2 (dual wheel) |
| Mounting | |
| Mount Style | Plate |
| Plate Size | 8-1/2" x 8-1/2" |
| Recommended Mounting Bolt | 5/8" |
| Wheel | |
| Wheel Material | Polyurethane |
| Wheel Color | Green Poly on Gray Center |
| Bearing Type | Straight Roller Bearing |
| Axle Diameter | 1" |
| Construction | |
| Frame / Finish | Platinum Powder |
| Temperature Range | -5°F to 160°F |
| Unit Weight | 125 lbs |
| 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 | |
|---|---|---|---|---|---|---|
| 6000 lbsLighter duty | 12" × 3"Polyurethane | Rigid | 15-1/2" | $599.00 | View → | |
| 6000 lbsLighter duty | 12" × 3"Ductile Iron | Swivel | 13-1/2" | $397.00 | View → | |
| 6300 lbs | 12" × 3"Polyurethane | Swivel | 15-1/2" | $1,878.00 | Viewing | |
| 7000 lbsHeavier duty | 12" × 3"Polyurethane | Swivel | 14-1/2" | $2,030.00 | View → |
