Kray ensures accurate industrial product discovery, regardless of search terminology

In complex catalogs, buyers search by specs, fit, and context.
Shaped by 200,000+ hours of real-world catalog research.

Want to know how Kray understands caster buyer intent?

Because Kray knows how casters are specified - across types, geometry, materials, bearings, and environments. That knowledge becomes your search + filters + product pages.

Kray recognizes caster language

Swivel/rigid, total lock vs wheel lock, stem vs top plate, non-marking, ESD, washdown.

Understands fit & geometry

Overall height, wheel dia/width, bolt pattern, offset & swivel radius clearance.

Maps to structured facets

Every query becomes filters: load ranges, wheel materials, bearing types, brake types, environment tags.

Types of casters & how they are specified

A snapshot of the depth we audit against - this is how buyers and engineers actually evaluate casters.

Swivel Casters

For maneuverability and frequent direction changes.

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Sub-types:standard swivel, swivel w/ brake, directional lock, total lock

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Key specs:wheel diameter, offset, swivel radius, bearing type

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Common issues:lock types not modeled, swivel geometry missing

Rigid (Fixed) Casters

For straight-line travel and stability.

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Sub-types:standard rigid, heavy-duty rigid

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Key specs:wheel width, axle diameter, load rating

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Common issues:mixed with swivel results, no steering context

Specialty Casters

Designed for specific environments or loads.

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Types:shock-absorbing, dual-wheel, central lock (medical)

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Key specs:suspension travel, load distribution, lock linkage

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Common issues:treated as standard casters in search

Wheel Materials

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Polyurethane (PU):low rolling resistance, high wear resistance

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Rubber:quiet, floor protection, vibration damping

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Nylon / Polyamide:chemical resistant, harder ride

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Cast iron / steel:extreme loads, harsh floors

Mounting & Geometry

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Mounting:top plate, threaded stem, grip ring, bolt hole

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Critical dimensions:overall height, bolt pattern, stem size

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Geometry:offset, swivel radius, kingpin design

Load, Bearings & Environment

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Load:static vs dynamic load, safety factor

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Bearings:plain, roller, ball, sealed precision

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Environment:stainless, washdown, ESD, high-temp

Complete caster selection & specification guide

This comprehensive reference combines use case recommendations with critical dimensions. This is the kind of clarity buyers expect, and what we audit your site against.

Use case / Wheel size	Recommended caster	Wheel material	Load capacity	Mounting type	Critical specs to filter
Industrial trolleys 5" - 6" wheels	Swivel + Rigid set	PU on Cast Iron	250 - 800 lbs	Top plate	Load rating, wheel dia, brake type, overall height
Medical equipment 3" - 4" wheels	Central lock swivel	Non-marking rubber	100 - 400 lbs	Stem mount	Noise level, hygiene rating, central lock linkage
Small furniture 2" - 3" wheels	Swivel (light-duty)	Nylon / soft rubber	50 - 250 lbs	Top plate / stem	Plate size, overall height, floor protection
Outdoor carts 4" - 6" wheels	Directional lock swivel	Rubber / PU	150 - 800 lbs	Top plate	Weather resistance, corrosion rating, bearing seal
Heavy machinery 6" - 8" wheels	Rigid heavy-duty	Cast iron / steel	600 - 1200+ lbs	Bolt hole	Static & dynamic load, wheel width, bolt pattern
ESD environments 3" - 5" wheels	Swivel w/ brake	Conductive PU	100 - 600 lbs	Top plate	Electrical resistance, bearing type, brake style
Utility carts 4" - 5" wheels	Swivel + Rigid set	Polyurethane (PU)	150 - 600 lbs	Top plate	Rolling resistance, wheel width, swivel radius

Critical dimensions

Overall height includes wheel + housing + mounting. Critical for clearance.
Wheel width affects stability and floor contact area.
Plate size must match mounting points. Standard patterns: 2"×2" to 6"×8".
Swivel offset ranges from 0.5" to 3". Affects maneuverability.

Load & performance specs

Load capacity varies by material, bearing, and use (static vs dynamic).
Bearings impact performance: plain, roller, ball, precision sealed.
Safety factor is typically 3:1 or 4:1 for static loads.
Environment tags include stainless, washdown, ESD, high-temp.

Key caster geometry (commonly missing online)

We look for these in your data model and UX because they directly affect fit, maneuverability, and buyer confidence.

Swivel radius & offset

Offset affects how easily a caster starts swiveling. Swivel radius determines the clearance needed to rotate.

Overall height & bolt pattern

Overall height affects clearance and ergonomics. Bolt pattern must match the equipment frame.

Niches where Kray ships faster

Specialized industry solutions ready to deploy

Pre-modeled intent, spec schemas, and facet blueprints for complex catalogs.

Casters

Load, mounting, brakes, wheel materials, swivel geometry, environment.

Industrial spare parts

Model compatibility, alternates, fitment, part families, cross references.

Spec-heavy components

Attribute normalization, range filters, engineered substitutions.

What buyers say vs What most sites show

The gap between how buyers describe their needs and what traditional search can handle

What buyers say

"I need a 4 inch swivel caster with brake, PU, 300kg."

"Top plate mounting, indoor epoxy floor."

"Needs directional lock for straight travel."

What most sites show

Hundreds of similar product tiles

No way to filter by lock type

Specs hidden in PDFs

Why caster ecommerce breaks

Standard ecommerce platforms weren't built for spec-heavy industrial products

What most sites do

Keyword search only

Works for short names, fails for spec-rich needs.

Rigid categories

Buyers can't combine load + mount + wheel + brake easily.

Specs scattered or inconsistent

"Top plate" vs "plate mount" vs "base plate".

What buyers need

Find by conditions

Load, mounting, wheel material, floor, environment.

Facet-driven narrowing

Dynamic facets that match intent - not static filters.

Confidence in fit

The right caster, not 200 "similar" results.

What your caster audit includes

A comprehensive analysis of search quality, facet structure, and data consistency

1) Search Quality Test (SQT)

We run real caster queries and grade relevance, coverage, and failure modes.

Long queries (load + mount + material)

Edge cases (ESD, washdown, high-temp)

No-results & wrong-results analysis

2) Category + Facet Review

We identify missing facets and restructure for how buyers actually refine.

Movement (swivel/rigid/locks)

Mounting (plate/stem/bolt-hole)

Wheel (material, dia, width)

3) Spec Consistency & Data

We normalize attribute naming so search + filters work reliably across SKUs.

Mounting terms & bolt patterns

Load ratings & safety factors

Environment tags (stainless, ESD)

Example findings we commonly see

Real issues that prevent buyers from finding the right products

Search failure examples

"swivel caster brake 5 inch PU 450kg"

Returns furniture casters, misses industrial duty.

Missing mounting facet

Users can't narrow to top plate vs threaded stem.

Lock types not modeled

Directional vs total lock treated as same.

Data issues

Inconsistent naming

"Plate mount" / "Top plate" / "Base plate".

Specs buried in PDFs

Not searchable, not filterable, not comparable.

Units mixed

mm/in, kg/lb inconsistently prevents filtering.

How Kray improves caster discovery

Purpose-built search that understands industrial product specifications

Understands spec-rich queries

Interprets buyer intent across load, movement, wheel, mounting, brakes, and environment.

Activates the right facets

Facets don't just filter - they guide users to the right SKU faster.

Built for complex catalogs

Works with industrial SKU data and improves search without forcing buyers to rephrase.