Silicon Bronze C65100 Fasteners
SILICON BRONZE C65100 FASTENERS | ULTIMATE GUIDE & MANUFACTURER
Ananka Fasteners is a premier manufacturer and supplier of high-quality Silicon Bronze C65100 Fasteners (UNS C65100), commercially known as Low-Silicon Bronze B. This single-phase, high-copper alloy synthesizes the corrosion resilience of commercially pure copper with mechanical yield strengths comparable to low-carbon steel, delivering exceptional fatigue endurance, a non-magnetic signature, and superior ductility for extreme cold heading.
■ Complete Range of Silicon Bronze C65100 Fasteners
As a master manufacturer, we produce a comprehensive range of C65100 fasteners spanning from marine hull hardware to precision electrical grounding components.
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Hex Bolts / Heavy Hex Bolts | Hex Nuts / Heavy Hex Nuts | Double End Studs |
| Carriage Bolts / Plow Bolts | Lock Nuts / Nylock Nuts | Fully Threaded Studs |
| Socket Head Cap Screws | Castle Nuts / Wing Nuts | Tap End Studs |
| Wood Screws / Lag Screws | Flat Washers / Lock Washers | U-Bolts / J-Bolts / Eye Bolts |
■ Silicon Bronze C65100 Material Specifications
| Material Equivalent Grades | UNS C65100 | Low-Silicon Bronze B | Copper-Silicon Alloy |
|---|---|
| Standard Specifications | ASTM F468 / ASME SF468 (Bolts, Hex Cap Screws & Studs — Marking F468K) ASTM F467 (Nuts — Marking F467K) ASTM B98 / B99 (Rod, Bar & Wire) |
| Size Range | Imperial: 1/4" to 1-1/2" (per F468) | Metric: M1.2 to M48 Broader custom range M1.2 to M160 / 1/4" to 4" available on request. |
| Common Tempers | OS035 (Annealed), H02 (Half Hard), H04 (Hard), H06 (Extra Hard) |
| Dimensional Standards | ASME B18.2.1 (Hex & Heavy Hex Bolts), ASME B18.2.2 (Hex Nuts) |
■ Chemical Composition of C65100
| Cu (Copper) | Si (Silicon) | Zn (Zinc) | Fe (Iron) | Mn (Manganese) | Pb (Lead) |
|---|---|---|---|---|---|
| 96.0% Min (Remainder) | 0.80 - 2.00% | 1.50% Max | 0.80% Max | 0.70% Max | 0.05% Max |
Lead is strictly limited to prevent "hot shortness" and preserve C65100's status as one of the most weldable copper alloys. Zinc is capped at 1.50% to guarantee immunity to dezincification.
■ Mechanical Properties by Temper
C65100 exhibits a strong strain-hardening response, allowing tensile strength to be tailored by cold-work temper while retaining critical ductility:
| Temper | Description | Min. Tensile (ksi) | Min. Yield (ksi) | Min. Elongation |
|---|---|---|---|---|
| OS035 | Annealed | 40 (Typical) | 15 (Typical) | 50% |
| H02 | Half Hard | 55 | 20 | 11 - 12% |
| H04 | Hard (~36% CW) | 65 | 35 | 8 - 10% |
| H06 | Extra Hard (~50% CW) | 75 - 85 | 40 - 55 | 6 - 8% |
Per ASTM F468 (Marking F468K): full-size product tensile 70-100 ksi min / yield 55-70 ksi min for 1/4"-3/4" diameters, with a minimum elongation of 8% in 4D.
■ Physical & Thermal Properties
| Density | 0.316 lb/in³ (8.75 g/cm³) |
|---|---|
| Melting Range | 1890 - 1940°F (1032 - 1060°C) |
| Electrical Conductivity | 12% IACS |
| Thermal Conductivity | 33.0 Btu/(sq ft·hr·°F) [57.1 W/(m·K)] |
| Modulus of Elasticity | 17,000 ksi (117 GPa) |
| Magnetic Permeability | < 1.01 (Non-Magnetic) |
■ Key Characteristics & Industrial Applications
C65100 combines the highest electrical conductivity of the silicon bronze family with total immunity to dezincification and oxygen-starvation crevice corrosion — a failure mode that frequently compromises 316 stainless steel in stagnant seawater or submerged timber.
- Crevice Corrosion Immunity: Unlike passive stainless steels, C65100 does not rely on continuous oxygen replenishment to resist chloride attack, making it dimensionally stable for decades below the waterline.
- Dezincification Resistance: Zinc capped at 1.50% guarantees the alloy will never suffer the structural hollowing that plagues naval brass.
- Anti-Biofouling: Continuously emitted copper ions deter barnacles, algae, and tubeworm colonization on marine hardware.
- Superior Weldability: Trace lead content and excellent TIG/MIG compatibility make it one of the most weldable copper alloys, ideal for securing studs to deck plates or bus bars.
- High Fatigue Endurance: Rated at 28 ksi over 100 million cycles (H04 temper), well suited to marine hull fastenings and vibration-prone assemblies.
■ Primary Industries Served
- Marine & Naval Architecture: Wooden and fiberglass hull fastenings, deck cleats, carriage bolts, and bronze fairleads.
- Electrical Power Distribution: Transformer mounting bolts, bus bar connectors, and subterranean grounding grid hardware.
- Petrochemical Processing: Heat exchanger tube sheet flanges, slurry tank studs, and hydraulic line U-bolts.
- Aerospace & Instrumentation: Non-magnetic bearing cages, gyroscopic mounts, and instrumentation housings.
- Historical Architectural Restoration: Decorative facade fastening with an authentic aged bronze patina.
