12" x 5" specification matrix
| Wheel build |
Capacity |
Best use |
| Rubber on steel |
2,000-3,500 lb |
Quiet routes, cushioned loads, finished floors |
| Polyurethane on cast iron |
3,500-5,000 lb |
Indoor transfer carts, platform trucks |
| Polyurethane on forged steel |
5,000-7,000 lb |
Heavy transfer, impact-prone routes |
| Forged steel |
7,000-10,000 lb |
Rail systems, hot environments, foundry |
Why 12" x 5" over 12" x 4" or 16" x 5"
Against 12" x 4": the extra inch of tread adds roughly 1,500-2,000 lb of capacity headroom at the same diameter and height. Against 16" x 5": same tread-area class, but 12" keeps the deck four inches lower — which matters when overhead clearance or loading ergonomics are constraints. The 12" x 5" is the pick when you need near-maximum capacity but can't afford the deck height of a 16-inch wheel.
Bearing and movement
Tapered roller bearings are standard at these loads — they carry radial weight and cornering thrust together. Four casters at 12" x 5" can total 40,000 lb; this is tugger or powered-movement territory, not hand-push.
FAQs
Can a 12x5 cart be hand-pushed?At the bottom of the range on smooth floor, with effort. Most applications are tugger-towed — the capacity that justifies this size exceeds hand-push range.
Top plate size?Typically 5" x 7" or larger with 8 mounting holes, scaling with capacity. Confirm the bolt pattern before retrofitting.
Polyurethane on cast iron or forged steel core?Cast iron for steady indoor loads. Forged steel once the route involves impact, towing, or dock-plate crossings.
Spec a 12 x 5 build
Send load per caster, floor type, and whether it's towed.
Call 844-439-4335
