Copper-Nickel-Silicon Alloy (CW111C) Pins: High Wear and Anti-Galling
Engineering Overview: Metallurgical breakdown of CW111C (CuNi2Si) bottom pin tumblers, combining 220 HV hardness with natural anti-galling lubricity.
Technical & Engineering Specifications
| Alloy Grade | CW111C (CuNi2Si / C18000 Precipitation Hardened) |
|---|---|
| Application | Master Key Bottom Pins & High-Traffic Tumblers |
| Vickers Hardness | 200 - 240 HV (Age-Hardened) |
| Anti-Galling Rating | Exceptional against Nickel-Silver & Brass Keys |
| Electrical Conductivity | 40% IACS |
Anti-Galling Pin Tumbler Metallurgy
Repeated key insertion under heavy commercial usage causes metal transfer and galling between bottom pins and key blades. CW111C (CuNi2Si / Nickel-Silicon Bronze) solves this.
Metallurgical Properties
- Precipitation Hardening: Achieves 200 to 240 HV hardness via nickel silicide micro-precipitates.
- Low Friction & Galling Resistance: Forms a low-wear pairing against nickel-silver keys, maintaining pin tip geometry within +/- 0.005 mm over 200,000 cycles.
Frequently Asked Engineering & Selection Questions
Q1: Why are CW111C alloy pins used in high-cycle locks?
They combine 220 HV hardness with natural anti-galling properties, preventing pin tip wear and maintaining exact bitting tolerances.