Silicon Bronze C66100 Fasteners
SILICON BRONZE C66100 FASTENERS | ULTIMATE GUIDE & MANUFACTURER
Ananka Fasteners is a premier manufacturer and supplier of high-quality Silicon Bronze C66100 Fasteners (UNS C66100), commonly known as Leaded Silicon Bronze. Alloyed with a small percentage of lead for dramatically improved machinability, C66100 is the premier choice for highly machined fasteners, intricate custom components, and high-speed screw machine products, while retaining excellent corrosion resistance and non-sparking, galling-resistant performance.
■ Complete Range of Silicon Bronze C66100 Fasteners
As a master manufacturer, we produce a comprehensive range of C66100 fasteners spanning from marine hardware to precision-machined custom components.
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Hex Bolts / Hex Cap Screws | Hex Nuts / Heavy Hex Nuts | Continuous Thread Studs |
| Socket Head Cap Screws | Jam Nuts / Acorn Nuts | Double End Studs |
| Screw Machine Products | Flat Washers / Lock Washers | Terminals / Contact Springs |
| Set Screws / Machine Screws | Custom CNC Machined Nuts | Bushings / Valve Stems |
■ Silicon Bronze C66100 Material Specifications
| Material Equivalent Grades | UNS C66100 | Leaded Silicon Bronze | Copper-Silicon-Lead Alloy |
|---|---|
| Standard Specifications | ASTM F468 (Nonferrous Bolts, Hex Cap Screws & Studs) ASTM F467 (Nonferrous Nuts) ASTM B98 / ASME SB98 (Copper-Silicon Alloy Rod, Bar & Shapes) |
| Size Range | Metric: M3 to M100 | Imperial: 1/4" to 1" Custom machined lengths available on request. |
| Thread Types | UNC, UNF, Metric Coarse, Metric Fine, BSW, BSF |
| Dimensional Standards | ASME B18.2.1 (Hex Bolts & Cap Screws), ASME B18.2.2 (Hex Nuts & Heavy Hex Nuts), ASME B18.21.1 (Washers) |
■ Chemical Composition of C66100
| Cu (Copper) | Si (Silicon) | Pb (Lead) | Mn (Manganese) | Zn (Zinc) | Fe (Iron) |
|---|---|---|---|---|---|
| 94.0% Min (Remainder) | 2.80 - 3.50% | 0.20 - 0.80% | 1.50% Max | 1.50% Max | 0.25% Max |
Minimum content of copper plus all other elements with specified limits shall be 99.5%.
■ Mechanical & Physical Properties
| Tensile Strength (Min) | Yield Strength (Min, 0.2%) | Elongation (in 4D, Min) | Hardness |
|---|---|---|---|
| 70 - 100 ksi (482 - 689 MPa) | 35 ksi (241 MPa) | 15% | 75 - 95 HRF |
For nuts manufactured to ASTM F467: Proof Stress (min) 70 ksi | Hardness ~75 HRB.
| Density | 8.52 g/cm³ (0.308 lb/in³) |
|---|---|
| Melting Point (Liquidus) | 1019°C (1832°F) |
| Modulus of Elasticity | 103.4 GPa (15,000 ksi) |
| Machinability Rating | 50% (vs. free-cutting brass at 100%) |
■ Standard Thread Data & Tensile Stress Areas
C66100 fasteners are commonly produced in Unified National Coarse (UNC) and Unified National Fine (UNF) thread series:
| Nominal Size (in) | UNC TPI | UNC Stress Area (in²) | UNF TPI | UNF Stress Area (in²) |
|---|---|---|---|---|
| 1/4" | 20 | 0.0318 | 28 | 0.0364 |
| 5/16" | 18 | 0.0524 | 24 | 0.0580 |
| 3/8" | 16 | 0.0775 | 24 | 0.0878 |
| 1/2" | 13 | 0.1419 | 20 | 0.1599 |
| 5/8" | 11 | 0.2260 | 18 | 0.2560 |
| 3/4" | 10 | 0.3340 | 16 | 0.3730 |
| 1" | 8 | 0.6060 | 12 | 0.6630 |
■ Key Characteristics & Industrial Applications
C66100 sacrifices a small amount of weldability, due to its lead content, in exchange for superior machinability, making it tailored for specific high-precision use cases.
- Superior Machinability: Rated at 50% relative to free-cutting brass, making it ideal for high-speed screw machine products and intricate custom components.
- Marine-Grade Corrosion Resistance: Highly resistant to saltwater corrosion, chloride pitting, and crevice corrosion.
- Non-Sparking & Anti-Galling: Suited for hazardous environments and repeated fastening without cold welding.
- Moderate Electrical Conductivity: Combined with high strength, suitable for pole-line hardware, contact springs, and terminals.
■ Primary Industries Served
- Marine & Naval Hardware: Boat building, marine fittings, and anti-fouling equipment.
- Electrical & Power: Pole-line hardware, contact springs, switch blades, and terminals.
- Heavy Industry: Oil refinery plumbing tubes, chemical processing equipment, bushings, bearings, and valve stems.
