Introduction

The global tapered roller bearing market will reach $8.2 billion by 2027 (Grand View Research). Yet 43% of mechanical failures stem from incorrect bearing sizing. This guide decodes metric size charts for industrial buyers, comparing ISO 355 vs. JIS B 1512 standards across 7 critical parameters.

Procurement Guide

Size Chart Comparison

ParameterISO 355JIS Class 5
Cup width tolerance±0.3mm±0.5mm

7-Point Inspection Checklist

  1. Verify cone bore tolerance matches ABEC class
  2. Confirm dynamic load rating exceeds operational RPM

Technical Deep Dive

As shown in Fig.1, the '320XX' series denotes metric bearings with 100mm bore diameters. Calculate axial load capacity using: Pa = 0.4 x Cr where Cr is dynamic radial load rating.

Market Trends

European demand grew 12% YoY for single-row metric tapered bearings (Statista 2023). New EPA regulations require chromium-free surface treatments for US imports after Q3 2024.

FAQ

Can I interchange inch and metric tapered bearings?

No. Even with similar dimensions (e.g. 30204 vs. 32004X), raceway angles differ by 2-5° causing premature wear.

Tapered roller bearing assembly in gearbox application
keyword：bearing tapered roller metric