Needle roller bearings are critical components in machinery, requiring precise part number identification for proper maintenance and replacement. This guide decodes numbering systems, compares manufacturer catalogs, and provides technical specifications for industrial applications.

Table of Contents

1. Needle roller bearing part number cross reference

Understanding cross-referencing between manufacturers like SKF, Timken, and NTN requires analyzing bearing dimensions, load capacities, and sealing types. ISO 3030 standards dictate number structures where the first two digits typically indicate series, followed by bore diameter codes. Professional cross-reference tools should account for: Radial clearance suffixes (C2/C3/C4), Cage material codes (J-steel, M-brass), and Special coating indicators (XN for nitrided surfaces). Always verify interchangeability through technical datasheets rather than relying solely on dimension matching.

2. How to read needle roller bearing numbers

Deciphering bearing codes involves breaking down alphanumeric sequences. For example, in NKIS 25-XL: NK denotes drawn cup type, I indicates reinforced seal, S specifies steel cage, 25mm bore. The XL suffix signifies extra load capacity. Japanese manufacturers like KOYO use different coding - RNA4902 translates to: RNA (needle roller assembly), 49 (series), 02 (02×15mm dimensions). Critical parameters to extract include: Basic designation (indicates bearing type), Suffixes (material/design variants), and Prefixes (application-specific features).

3. Needle roller bearing size chart PDF

Standard size charts should list: Nominal bore diameter (d), Outer diameter (D), Width (B/C), Dynamic load rating (Cr), and Limiting speed. For drawn cup bearings, include cup thickness (F) and roller diameter (Dw). Metric series (e.g., RNA49) and inch series (e.g., NATR-10PPX) require separate charts. Essential conversion formulas: Bore (mm) = 5×(last two digits) for metric bearings; Inch bore = (last two digits)/16. Always cross-check against manufacturer specifications when available.

4. INA needle bearing catalog download

INA's ZARN and ZKLF series feature unique numbering conventions. The ZARN 3072-L-TV designation breaks down as: ZARN (double-row angular contact), 30 (series), 72 (bore 72mm), L (light preload), TV (PTFE seals). Their catalog organizes bearings by: Application (transmission vs. pump bearings), Lubrication type (grease-packed or oil-lubricated), and Precision class (P6/P5). Critical technical data includes: Axial load capacity ratios (Fa/Fr), Temperature ranges (-30°C to 150°C standard), and Recommended mounting tools.

5. Needle roller bearing replacement guide

When substituting bearings, evaluate: Dynamic equivalent load (P = XFr YFa), Minimum load requirements (to prevent skidding), and Lubrication compatibility. For obsolete numbers like Torrington B-1212, use dimension matching (12mm ID × 22mm OD × 16mm width) combined with load ratings. Upgrade options include switching from open to sealed designs (adding DD suffix) or upgrading cage materials. Always perform post-installation checks: Runout measurement (max 0.05mm TIR), and Initial torque values (1-3 Nm typical for small bearings).

This comprehensive guide addresses all critical aspects of needle roller bearing identification and selection. From decoding complex part numbers to accessing manufacturer catalogs, you'll find practical solutions for cross-referencing obsolete parts, interpreting technical charts, and selecting optimal replacements. The included size conversion formulas and load calculation methods ensure precise bearing selection for industrial machinery, automotive systems, and heavy equipment applications.

Mastering needle roller bearing part numbers enables efficient maintenance planning and reduces equipment downtime. By understanding manufacturer coding systems, utilizing cross-reference tools, and applying proper selection criteria, engineers can ensure optimal bearing performance across various operating conditions. Keep this guide bookmarked for quick access to critical technical data during your next bearing replacement project.