8-1/2″ x 8-1/2″ plate casters — industrial top-plate mount casters with the 8-1/2″ x 8-1/2″ bolt-hole pattern. Capacity to 20,000 lb per caster on 10″ - 16″ wheels. Specified for super-heavy industrial, aircraft tugs, military, foundry. 23 styles stocked across Hamilton, Albion, Faultless, Caster Concepts, and Service Caster series. Standard bolt pattern: 6-3/4″ x 6-3/4″. Stocked at our Mansfield, TX facility for same or next-day shipping.
Standard configurations and capacity tiers stocked for 8-1/2″ x 8-1/2″ top-plate casters. Match wheel size to floor condition and load.
| Spec | Standard | Best For |
|---|---|---|
| Plate Size | 8-1/2″ x 8-1/2″ | Match existing equipment bolt pattern |
| Bolt Pattern | 6-3/4″ x 6-3/4″ | Verify with calipers before ordering |
| Capacity Range | Up to 20,000 lb per caster | super-heavy industrial, aircraft tugs, military, foundry |
| Wheel Sizes | 10″ - 16″ | Larger wheels = lower push force, higher deck |
| Tier Class | Super Heavy | Spec match to load + duty cycle |
| Brands Stocked | Hamilton, Albion, Faultless, Caster Concepts | Cross-reference supported |
| Configurations | Swivel, Rigid, Total Lock, Brake | Spec at order |
| Ship Time | Same-day before 3pm CT | Mansfield, TX warehouse |
Measure your existing equipment plate bolt-hole pattern with calipers. The 8-1/2″ x 8-1/2″ plate uses a 6-3/4″ x 6-3/4″ bolt pattern. Replacement casters must match BOTH the overall plate dimensions AND the bolt-hole spacing — even 1/16″ off prevents bolt-for-bolt install. Photograph the existing mount and email info@casterhq.com if unsure.
Total cart load divided by 4 casters, plus 30% safety margin (50% for outdoor or shock applications). The 8-1/2″ x 8-1/2″ plate supports up to 20,000 lb per caster — that’s 80,000 lb total cart capacity at 4 casters. Match to your actual load, don’t exceed.
Available wheel range: 10″ - 16″. Smooth concrete: smaller wheels work. Floor seams, thresholds, debris: 6″+ minimum. Outdoor or rough surfaces: 8″+ required. Larger wheels reduce push force by ~30% per 2″ diameter increase.
Standard options for 8-1/2 x 8-1/2 plate: poly-on-iron (highest capacity, non-marking), cast iron (max capacity, marks floors), phenolic (heat-resistant), polyurethane (non-marking, quiet), pneumatic (rough terrain, shock absorption). Email info@casterhq.com with environment for material recommendation.
A top-plate mount industrial caster sized for the 8-1/2″ x 8-1/2″ bolt pattern. Capacity up to 20,000 lb per caster on 10″ - 16″ wheels. The plate dimensions and bolt pattern (6-3/4″ x 6-3/4″) determine compatibility with existing equipment mounts.
Up to 20,000 lb per caster at static rating. For a 4-caster cart: 80,000 lb total capacity. Always size 30% above your peak load for safety margin (50% for shock-load applications).
The 8-1/2″ x 8-1/2″ plate supports 10″ - 16″ wheels in standard configurations. Larger wheels require longer hub bores but the top-plate dimensions stay constant. Verify wheel-to-floor clearance after install.
Measure your existing mount with calipers: overall plate dimensions (8-1/2″ x 8-1/2″) AND bolt-hole spacing (6-3/4″ x 6-3/4″). Both must match for bolt-for-bolt replacement. Photograph the existing caster mount and email info@casterhq.com for cross-reference verification.
Hamilton (heaviest capacity, mil-spec), Albion (USA-made, widest selection), Faultless (economy industrial), Caster Concepts (custom-engineered, fastest lead time for non-stock), and Service Caster (light-to-medium duty). All cross-reference supported.
Standard 8-1/2″ x 8-1/2″ casters: zinc-plated or zinc-yellow chromate steel for indoor industrial. Stainless (304 or 316) for wet, washdown, food, pharma, chemical environments. Stainless costs 2-3x more and capacity is 70-80% of equivalent steel. Specify by environment.
Industrial plate casters ship without bolts — bolt length depends on frame thickness. Standard bolt sizes for 8-1/2″ x 8-1/2″ plate: 5/16″-18 to 1/2″-13 grade 5 zinc-plated. Use 4 bolts + lock washers + nuts per caster.
Stock 8-1/2″ x 8-1/2″ casters ship same day from Mansfield, TX before 3pm CT. Freight-class sizes (20,000 lb capacity and above) are quoted at order. Engineer cross-reference: next-business-day response from info@casterhq.com.
