John Crane - A division of Smiths Group
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Performance Charateristics of Bearing Materials

The following tables provide Performance Characteristics of common bearing materials. Orion designed bearings are supplied with a high-tin lining according to the ASTM B-23 and QQ-T-390 Grade 2 Specifications. We have chosen the Grade 2 Babbitt because of its excellent characteristics.

Bearing Alloy Hardness Room Temp Hardness 300 deg. F Min Shaft Hardness Load Carrying Capacity Maximum Operating Temperature Compatibility Conformability & Embeddability Corrosion Resistance Fatigue Strength
  (Brinell) (Brinell) (Brinell) (psi) (F) (see scale) (see scale) (see scale) (see scale)
Tin-base babbitt 20-30 6-12 130-170 800-1500 300 X X X XXXXX
Lead-base babbitt 15-20 6-12 130-170 800-1200 300 X X XXX XXXXX
"Three-component bearings, babbitt surfaced" ** ** 200-300 2000-5000 300 X XX XX XX
Cadmium base 30-40 15 200-250 1500-2000 500 X XX XXXXX XXXX
Copper-lead 20-30 20-30 200 1500-2500 350 XX XX XXXXX XXX
Lead bronze 40-70 40-60 300 3000-4000 450 XXX XXXX XXXX XX
Tin bronze 60-80 60-70 300-400 >4000 500 XXXXX XXXXX XX X
Aluminum alloy 45-50 40-45 200-300 >5000 250 XXXX XXX X XX
Silver (overplated) 25 25 300-400 >5000 500 XX XXX X X