Spring Loaded CD Disk Inner Torsion Unit 20725 Stainless Steel 0-1 0-12 7x5x4

Spring Loaded CD Disk Inner Torsion Unit 20725 Stainless Steel 0-1 0-12 7x5x4

This is a spring-loaded CD disk inner torsion assembly, part number 20725, constructed from machined stainless steel. The unit consists of a laminated plate-stack body with an integrated open channel housing two blue compression/torsion springs, a top-mounted locating pin shaft, and a circular bottom mounting flange with a bolt pattern — designed for precise, spring-assisted rotational or clamping force application in an optical disc manufacturing press or stamper line.

Specifications & What's Included

• Part Number: 20725
• Description (as stamped on unit): DISK INNER TORSION NO.20725
• Torsion Range: 0-1 / 0-12
• Body Material: Stainless steel (laminated plate-stack construction)
• Dimensions: 7" x 5" x 4"
• Springs: Two blue torsion/compression springs, housed in front-face open slot
• Top: Central locating/guide pin (hex-socket knurled head), multiple threaded mounting holes, hex socket cap screws
• Bottom: Circular mounting flange with bolt pattern (5 holes) and central bore
• Side plates: Engraved layer/index numbers (12, 15, 17 visible on side faces)
• Rear: Brass set screw visible; part description and number stamped into body
• Includes: Unit only — no additional accessories

Applications

This type of spring-loaded inner torsion assembly is used in CD, DVD, and Blu-Ray optical disc manufacturing equipment — specifically within disc stamper presses, injection molding tooling systems, or disc handling mechanisms that require controlled, repeatable spring-loaded clamping or torsional force. In an optical disc plant, tooling like this is used to maintain precise disc positioning, apply consistent clamping pressure to stamper dies, or control rotational indexing during the replication process. The laminated stainless steel plate construction is common in high-precision tooling blocks used in clean-room-adjacent disc manufacturing environments where rigidity, corrosion resistance, and dimensional stability are critical. This unit was pulled from an active CD/DVD/Blu-Ray production facility, indicating it was part of a working press or stamper line. It would be of interest to facilities maintaining or rebuilding optical disc replication equipment, or to tooling engineers sourcing precision spring-loaded components for similar stamping and indexing applications.