Bearings by Type
Bronze Bearings
Spyraflo’s bronze bearings are manufactured in accordance with MPIF Standard 35, equivalent to SAE 840 and ASTM B438/438M-05 specifications, and contain approximately 25% oil (by volume). Bronze bearings are pre-lubricated with oil that is vacuum-impregnated into the pores of the structure during production. Rotation of the shaft creates a hydrodynamic action that self-lubricates the bearing by drawing oil to the surface creating a film between the bearing and shaft.
Bronze bearings are ideal for high-speed, medium-load applications and are well suited where electrical current or static electricity must pass through the bearings and dissipate to the machine frame. Additional options include food-contact oils or the addition of graphite as a solid lubricant.
TECHNICAL SPECIFICATION
Bronze
Material: Copper: 90% (bal.), Tin: 9.5-10.5%, Graphite: 0.0-0.3% (max), Other: 0.0-2% (max)
Lubrication: Mobil DTE Medium Oil
P - Pressure: 2,000 PSI
V - Velocity: 1,200 FPM
PV Rating: 25000 PSI x FPM
Friction Coefficient: µ 0.04 - 0.35
Shaft Requirements: 95 HRB (min), 16 RMS (0.4 Ra) Surface Finish
Operating Temp: -20° to 200° F
Options: -HG for High-Temp Graphite, -H3 for Super Lube Oil (food contact)
Maintenance: None
Storage: Clean, dry storage in plastic containment (bags or bins).
Avoid absorbent materials (paper/cardboard) that may wick oil from bearing.
We offer bearings in press-fit, self-clinching, or mounted configurations, with plain or rolling elements, in a variety of materials. Bearings come in standard inch and metric sizes — including miniature options.
