A 3X50-SK31U68 is a constant force extension spring made of 301 stainless steel, designed for prototype and small-production applications, with a spring force of 19.6 lb, a maximum working deflection of 68 inches, and a minimum fatigue life of 13,000 cycles. The spring has a band thickness of 0.031 inch and a width of 2 inches, with mounting holes for end fastening as specified in the drawings. The drum diameter is not supplied.
Industrial fasteners are hardware devices that join two or more items together, creating a semi-permanent or permanent connection. The fasteners most frequently used by machinery designers are screws, nuts, retaining rings, and various types of pins because of the basic role that they play in the assembly of mechanisms. Various industrial hardware components are used in the assembly process including knobs, washers, spacers, shims, handles, springs, spring-powered reels, and ball plunger screws.
Fasteners play a vital role in a wide range of applications, from everyday household items to medical devices, robotics, and even outer space. Careful consideration must be given before selecting the most appropriate fastener for an application.
Download Reference Tables to help with selection:
| Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|
| Product Category | Constant Force Springs |
| Product Number | A 3X50-SK31U68 |
| Product Name | Constant Force Spring: 19.6 lb Spring Force, 13000 cycles Fatique Life, 68" Band length |
| Material | 301SS |
| Life Cycle | 13000 cycles |
| Load Force | 19.6 lbs (8.89 kg) |
| Inside Diameter | 3.44 inch (87.31 mm) |
