Supplier Guidance
Need a U.S. material match for LB4?
BS1400 LB4 is usually cross-referenced with ASTM C93500 / SAE 66, not C93200. If your project must be quoted from a different bearing bronze grade, the drawing should be reviewed before any substitution is made.
Use this page to start the sourcing conversation, then send the drawing, dimensions, quantity, and operating conditions so the final material can be checked before production.
Equivalent at a Glance
Engineering Check
Material Data to Review Before Quoting
This table gives your engineering, purchasing, or quality team a fast way to compare the source callout with the U.S. material starting point. It supports RFQ review; it does not replace the approved drawing or material specification.
| Item to compare | LB4 | C93700 |
|---|---|---|
| Tin (Sn) | 4.0-6.0% | C93700: 9.0-11.0% |
| Lead (Pb) | 8.0-10.0% | C93700: 8.0-11.0% |
| Zinc (Zn) | 2.0% max. | C93700: 0.8% max. |
| Closest ASTM callout | C93500 / SAE 66 | C93700 is a nearby high-leaded tin bronze, not the exact LB4 match |
| Practical conclusion | Do not force LB4 into C93200 by name alone | Quote only after drawing and chemistry review |
BS1400 LB4 public datasheets list C93500 / SAE 66 as the direct U.S. cross-reference. Precision Bronze currently has C93700 and C93200 material pages for nearby bearing bronze review.
Where This Cross-Reference Helps
This page is useful for replacement bushings, thrust washers, pump bushings, and older Commonwealth equipment drawings that list LB4.
If your print uses LB4, include the full drawing, tolerances, quantity, required supply form, and inspection notes with the RFQ. That lets us quote the material and manufacturing route with fewer back-and-forth questions.
Related Specifications You May See
The same material family may also appear under these names or standards: CuSn10Pb10, CC495K, ZCuSn10Pb10, CAC603, CuPb10Sn10.
If one of these appears on your drawing or purchase record, include it with the RFQ. It helps us understand the original specification and avoid quoting a material that only looks similar on paper.
Before You Substitute the Material
Confirm the leaded tin bronze composition range, casting process, and load conditions before treating any nearby grade as interchangeable.
Cross-reference charts are helpful for purchasing and maintenance teams, but they do not replace a formal material specification, mill certificate, or customer-approved drawing.
Available Forms
Common supply forms for C93700
Once the material match looks right, the next question is usually shape and machining route. Precision Bronze can quote C93700 as standard stock or finished parts depending on the drawing, size, tolerance, and quantity.
Bronze Solid Bar Bronze solid round bar and rod stock for machining bushings, bearings, pins, spacers, gears, and custom bronze parts. 
Bronze Cored Bar Bronze cored bar and hollow bar stock for efficient machining of sleeve bushings, bearings, rings, and bronze components. 
Plain Bronze Sleeve Bushings Plain bronze sleeve bushings and cast bronze sleeve bearings in C93200 SAE 660 and alternative alloys for radial load applications. 
Bronze Thrust Washers Bronze thrust washers and bearing washers machined from C93200 SAE 660 and high-strength bronze alloys for axial load support. 
Bronze Wear Plates Bronze wear plates, guide strips, and graphite plugged wear plates for sliding surfaces, tooling, and heavy equipment.