C93200 Cast Bronze Sleeve Bushings - SAE 660

Q: Is SAE 660 the same as C93200?

Yes. C93200 (UNS) and SAE 660 are the same alloy (High-Leaded Tin Bronze). You may also see it listed as CDA 932 or "Bearing Bronze." These terms are interchangeable.

Q: What clearance should I specify between the bushing and shaft?

The standard rule is 0.001 inches of clearance per inch of shaft diameter. (Example: A 2-inch shaft requires ~0.002" clearance). High-speed applications may require slightly more clearance to accommodate thermal expansion.

Q: What shaft hardness do I need?

We recommend a shaft hardness of 35-50 HRC. While C93200 is forgiving, a harder shaft ensures the bushing wears preferentially (saving the expensive shaft) and prevents galling under load.

Select Bushing Sizes and Request a Quote

Filter standard sizes below to build your quote, or contact us for custom machining and non-standard dimensions.

Part #	I.D.	O.D.	Length	Qty	Request Quote

C93200 (SAE 660) is the primary choice for machine tool bearings in industrial machinery and heavy equipment due to its excellent machinability and cost-effective load capacity. This high-leaded tin bronze handles loads up to 4,000 PSI and speeds up to 750 SFM, making it ideal for excavator booms, pump impellers, and agricultural equipment where lubrication is available.

Industrial Machinery

The workhorse application for C93200. You'll find SAE 660 bushings in machine tool spindles, forging press linkages, rolling mill bearings, punch press guides, and crane sheaves and trunnions. The alloy's combination of load capacity, machinability, and cost-effectiveness makes it the default choice for general industrial bearing applications where lubrication is available.

Hydraulic Systems

Hydraulic cylinders, pumps, and presses rely on C93200 for rod guides, gland bushings, piston wear rings, and pump gear bushings. The material handles the cyclic loading and moderate speeds typical of hydraulic equipment. For cylinder applications with limited re-lubrication access, graphite-plugged options extend service intervals.

Construction & Earthmoving Equipment

Excavator boom and arm pivot bushings, loader bucket pin bushings, bulldozer track roller bushings, and grader kingpin bearings. Construction equipment sees high loads, shock, and contamination. C93200's toughness and the lead content's boundary lubrication properties help it survive tough conditions. Many equipment rebuilders specify graphite-plugged bushings for pivot points that are difficult to grease regularly.

Agricultural Equipment

Tractor drivetrain and suspension bushings, combine harvester linkage pivots, hay baler plunger guides, disc harrow pivot bushings, and tillage equipment wear points. Agricultural applications often involve seasonal use with long idle periods followed by intense operation. C93200's corrosion resistance and ability to handle shock loads make it well-suited to farm equipment.

Pumps & Fluid Handling

Centrifugal pump shaft bushings, gear pump housing bushings, valve stem guides, and impeller wear rings. C93200 provides good performance in pump applications where the pumped fluid provides lubrication. For dry-start or intermittent lubrication conditions, consider graphite-plugged options.

Additional Applications

C93200 also appears in material handling equipment (forklifts, conveyors), automotive components (wrist pins, suspension), mining equipment (crusher bushings, screen decks), and power generation (turbine linkages, generator bearings). For marine applications or highly corrosive environments, C95400 aluminum bronze may be a better fit.

Need Oil & Grease Grooves or Graphite Plugging Added?

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Oil & Grease Grooves

We machine lubrication grooves to your print or to standard industry patterns. Groove selection depends on shaft motion, lubricant type, and how lubrication is delivered to the bearing.

Pattern	Best For
Single Loop	General purpose; rotating shafts with periodic greasing
Figure Eight	Rotating shafts; distributes grease across full bearing surface
Double Loop	Boundary lubrication; slow speeds under 10 SFM
Double Figure Eight	Heavy boundary lubrication; intermittent operation
Straight Groove	Reciprocating motion; long bearings; locate in unloaded zone
Circular Groove	Varying load direction with pressure-fed oil system
Straight + Circular	Varying load direction without pressure-fed lubrication
Spiral (RH or LH)	Continuous rotation; helps move lubricant along bearing length

Graphite Plugged & Grooved

For high-temperature applications or locations where re-lubrication is difficult, graphite provides supplemental dry lubrication. Two options are available:

Graphite Plugged

Holes are drilled into the bearing ID in a specified pattern, then filled with solid graphite plugs under high pressure. As the bearing wears, graphite transfers to the shaft surface, providing continuous dry lubrication. Common in construction equipment pivot bushings, furnace components, and applications where grease would burn off or contaminate the process.

Graphite Grooved

Machined channels on the bearing ID are filled with graphite. Provides more graphite surface area than plugging for applications requiring extended self-lubrication between service intervals.

Installation Note

Graphite-lubricated bushings require 0.001–0.002" additional shaft clearance compared to standard bushings. This can be specified as a larger ID or achieved by reaming after installation. Lubricate the bushing prior to initial assembly.

Frequently Asked Questions

Expert answers to common technical questions about bronze bushings, material selection, and installation specifications.

Is SAE 660 the same as C93200?

When should I choose C93200 over C95400 Aluminum Bronze?

Choose C93200 for general-purpose bearing applications with moderate loads (max 4,000 PSI) and speeds (max 750 SFM). It is cost-effective and has excellent anti-friction properties. Upgrade to C95400 only if you require high tensile strength, impact resistance, or corrosion resistance.

What clearance should I specify between the bushing and shaft?

Do standard bushings come with oil grooves?

No. Our standard C93200 stock is sold "plain" (smooth ID). If your application requires grease distribution (e.g., for use with a Zerk fitting), we can machine any groove pattern (Figure-8, Loop, Straight) to your specifications. Contact us for a custom machining quote.

Do I need to ream the bushing ID after pressing it in?

Yes, in most precision applications. Pressing a bushing into a housing typically shrinks the ID by 70–100% of the interference fit (e.g., a 0.002" press fit shrinks the ID by ~0.0015"). You must ream or bore the bushing after installation to restore the correct running clearance.

What is the maximum operating temperature?

C93200 maintains structural integrity up to ~450°F, but your lubricant will likely fail first. Standard grease and oil often break down between 200°F and 300°F. For applications exceeding 450°F, consider using Graphite-Plugged Bronze or high-temp alloys.

What shaft hardness do I need?

C93200 (SAE 660) Cast Bronze Sleeve Bushings

Bearing bronze per ASTM B505. Standard and custom sizes.