Lathe Cut Washer---A lathe-cut washer is a type of washer, typically made of rubber or metal, that is manufactured by cutting it from a tube of material on a lathe, rather than being stamped out from a sheet .
Key Characteristics
Process: The washer is "parted" or cut from a pre-formed, extruded cylindrical tube of material using a lathe. This is a subtractive manufacturing process .
Material: Most commonly used for rubber washers, where they are produced from an extruded rubber tube . The process is also used for metal washers, machining them from bar stock or plate .
Distinction from Stamping: Unlike die-cut or stamped washers, which are punched from a flat sheet, lathe-cut washers are machined. This avoids issues common to stamping, such as "apple core" edges on rubber or burrs and edge deformation on metal parts .
Advantages
The lathe-cutting process offers several specific benefits compared to other manufacturing methods:
Superior Edge Quality: For rubber washers, the process creates parts with square, clean edges and no mold flash or flow marks. For metal washers, machining provides a cleaner edge profile than stamping .
High Precision: This method allows for tight tolerances. For example, some custom manufacturers advertise tolerances as precise as ±0.003 inches for lathe-cut washers . Metal washers can achieve thickness tolerances of ±0.01mm .
No Tooling Investment for Molds: For rubber lathe-cut washers, expensive molds are not required. The washers are cut from an extruded tube, offering designers flexibility in sizing without the high upfront cost of tooling .
Suitable for Large Sizes: Lathe-cutting can produce washers with diameters up to 16 inches or more .
Typical Applications
The high quality and precision of lathe-cut washers make them suitable for demanding applications:
Rubber Washers: Often used as an economical alternative to O-rings in static sealing applications, such as in oil and air filters, gas fittings, and chemical container seals .
Metal Washers: Used when high flatness, parallelism, and dimensional accuracy are critical, such as in automotive powertrains, precision automation, and high-load bolted joints