Silicon Bronze C64700 Fasteners
SILICON BRONZE C64700 FASTENERS | ULTIMATE GUIDE & MANUFACTURER
Ananka Fasteners is a premier manufacturer and supplier of high-quality Silicon Bronze C64700 Fasteners (UNS C64700), also known as Nickel-Silicon Bronze. This age-hardenable, copper-nickel-silicon alloy is precipitation hardened to achieve mechanical strength rivaling medium-carbon steel, while retaining non-magnetic properties, excellent conductivity, and outstanding resistance to marine corrosion and stress-corrosion cracking.
■ Complete Range of Silicon Bronze C64700 Fasteners
As a master manufacturer, we produce a comprehensive range of C64700 fasteners spanning from high-strength marine hardware to precision electrical components.
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Heavy Hex Bolts / Cap Screws | Hex Nuts / Jam Nuts | Threaded Rods |
| Socket Head Cap Screws | Heavy Hex Nuts | Double End Studs |
| Machine Screws | Flat Washers / Lock Washers | Continuous Thread Studs |
| Set Screws | Custom CNC Machined Nuts | Custom CNC Machined Studs |
■ Silicon Bronze C64700 Material Specifications
| Material Equivalent Grades | UNS C64700 | Nickel-Silicon Bronze | Copper-Nickel-Silicon Alloy |
|---|---|
| Standard Specifications | ASTM B411 (Copper-Nickel-Silicon Alloy Rod & Bar) ASTM B412 (Copper-Nickel-Silicon Alloy Wire) |
| Temper Condition | TF00 (Precipitation Hardened) — standard for maximum load-bearing capability |
| Size Range | 3/32" to 2" (2.38mm to 50.8mm) Custom machined lengths available on request. |
| Dimensional Standards | ASME B18.2.1 (Heavy Hex Bolts & Cap Screws), ASME B18.2.2 (Hex Nuts & Jam Nuts) |
■ Chemical Composition of C64700
| Cu (Copper) | Ni+Co (Nickel/Cobalt) | Si (Silicon) | Zn (Zinc) | Fe (Iron) | Pb (Lead) |
|---|---|---|---|---|---|
| Balance | 1.60 - 2.20% | 0.40 - 0.80% | 0.50% Max | 0.10% Max | 0.10% Max |
Total named elements shall constitute a minimum of 99.5% of composition. Nickel and silicon are what enable precipitation hardening in this alloy.
■ Mechanical Properties (TF00 Temper Condition)
Fasteners made from C64700 are typically supplied in the TF00 (Precipitation Hardened) condition. Properties vary slightly by diameter of the raw rod or bar stock:
| Diameter / Size | Min. Tensile Strength | Min. Yield Strength (0.5% Ext) | Min. Elongation |
|---|---|---|---|
| 3/32" - 1.5" (2.38 - 38.1mm) | 90 ksi (620 MPa) | 75 ksi (515 MPa) | 8% |
| Over 1.5" - 2" (38.1 - 50.8mm) | 80 ksi (550 MPa) | 70 ksi (485 MPa) | 8% |
Note: Hardness testing is not typically the governing criteria for acceptance in ASTM B411; tensile and yield strengths dictate compliance.
■ Physical & Thermal Properties
| Density | 0.320 lb/in³ (8.88 g/cm³) |
|---|---|
| Melting Point | 1940°F (1060°C) |
| Electrical Conductivity | 37 - 45% IACS (at 68°F / 20°C) |
| Thermal Conductivity | 98 - 106 BTU/sq ft/ft/hr/°F |
| Machinability Rating | 30% (Relative to Free-Cutting Brass at 100%) |
■ Key Characteristics & Industrial Applications
The addition of nickel makes C64700 heat-treatable, allowing it to reach mechanical strength levels well beyond standard silicon bronzes while retaining excellent ductility and conductivity.
- High Strength: Rivals many medium-carbon steel fasteners when precipitation hardened to the TF00 condition.
- Non-Magnetic: Ideal for sensitive electrical and electronic applications.
- Excellent Conductivity: High electrical and thermal conductivity compared to standard stainless steels or other bronzes.
- Corrosion Resistance: Performs exceptionally well in marine environments, fresh water, and industrial atmospheres, with strong resistance to stress-corrosion cracking.
■ Primary Industries Served
- Marine & Naval: High-load fastening applications requiring both strength and saltwater corrosion resistance.
- Electrical & Electronics: Switchgear components and non-magnetic hardware requiring high conductivity.
- Industrial Manufacturing: High-strength fasteners for equipment exposed to industrial atmospheres.
