Bronze material family
Tin Bronze
Cast copper-tin-zinc bronzes for pressure tightness, strength and corrosion resistance.
Overview
Tin bronzes are classic copper-tin-zinc casting alloys with little or no lead. They are noted for pressure tightness, good corrosion resistance in water and steam and good wear performance. C90300 (about 8% tin) and C90500 (about 10% tin, “gun metal”) are the two grades listed here.
They are used for gears, worm wheels, valve and pump parts and marine hardware, usually in cast bar or sand-cast form.
Grades in this family
C90300 – Tin Bronze (88-8-0-4)An unleaded tin bronze with good strength, pressure tightness and corrosion resistance for valve bodies, bushings and gears.View details →C90500 – Tin Bronze (88-10-0-2, Gun Metal)A harder gun-metal type tin bronze (about 10% tin) for bearings, gears and valve parts that need strength and corrosion resistance.View details → | UNS | Name | Type | Product forms listed |
|---|---|---|---|
| C90300 | Tin Bronze (88-8-0-4) | Cast copper-tin-zinc alloy | Rod |
| C90500 | Tin Bronze (88-10-0-2, Gun Metal) | Cast copper-tin-zinc alloy | Rod |
Product forms listed are those shown on this website; availability is confirmed per inquiry.
Selection guide
- General pressure-tight castings and bushings: C90300.
- Harder, wear-resistant gears and bearings: C90500.
- Easier machining with marginal lubrication: consider C93200.
- Heavier duty: consider aluminum bronze.
Typical applications
- Valve bodies and fittings (design dependent)
- Bushings and bearings
- Gears and worm wheels
- Pump components
- Marine hardware in compatible service
- Worm wheels and gears
- Bearings in wet or marine service
- Valve and pump components
- Bushings for medium loads
- Steam and water fittings (design dependent)
Examples only – confirm suitability for your service.
Frequently asked questions
Are tin bronzes lead-free?
They are low-lead (a trace limit in the specification) but are not marketed here as meeting any drinking-water standard.
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