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Retaining Rings

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Retaining Rings




  • Allows Easy Mounting of Optical Components
  • Compatible with Our Line of Lens Tubes and Mounts
  • Stress-Free and Plastic Vesions Available in Our Most Popular Sizes

Highlights

  • Standard (Aluminum) Retaining Rings Available for Optics Ranging from Ø5 mm to Ø4"
  • Stress-Free Retaining Rings are Compatible with the SM05, SM1, and SM2 Thread Standards
  • Delrin (Plastic) SM1 Retaining Ring Provides Gentler Contact with Optic Surface

Thorlabs offers a wide selection of retaining rings for securing optical components into our threaded mounts, lens tubes, and unmounted optic adapters. Two retaining rings can be used to secure the optical component inside the center of a lens tube: one as a stopper and the other to lock in the component. Depending on the size needed, these retaining rings are available in one or more of the following types: standard (aluminum), stress-free, or plastic (see table below for details).

The stress-free versions (SM05LTRR, SM1LTRR, and SM2LTRR) have a rubber O-ring that provides a light-tight seal around the optical components. The SM1PRR plastic retaining ring is produced from Delrin to provide gentler contact with an optic's surfaces than our standard SM1RR retaining ring. Please keep in mind that due to the increased thickness of the plastic retaining ring, the thickness of the optic that can be accommodated in the mount may be reduced.

Thorlabs also offers a line of compatible fixed diameter and adjustable spanner wrenches for rings with diameters ranging from 1/4" to 3" and spanner bits for SM05, SM1, SM2, and SM3 retaining rings. Additionally, we offer retaining rings for RMS threads and an extensive line of thread adapters.

Standard Retaining Rings: Ø5 mm to Ø1/2" (12.7 mm)

 

  • Standard Retaining Rings for Optics Ranging from Ø5 mm to Ø1/2"
  • Compatible with our Optic Mounts and Lens Tubes

Our Standard Retaining Rings, available in sizes to match our optic mounts and lens tubes, are designed to maximize the clear aperture while providing sufficient holding force. Securing an optic using a retaining ring is a stable method for holding the optic since the optic is retained along its entire edge instead of just at a few points. Each retaining ring is machined with two slots for compatibility with our selection of spanner wrenches.

 

Standard Retaining Rings: Ø13 mm to Ø1"

 

  • Standard Retaining Rings for Optics Ranging from Ø13 mm to Ø1"
  • Compatible with our Optic Mounts and Lens Tubes

Our Standard Retaining Rings, available in sizes to match our optic mounts and lens tubes, are designed to maximize the clear aperture while providing sufficient holding force. Securing an optic using a retaining ring is a stable method for holding the optic since the optic is retained along its entire edge instead of just at a few points. Each retaining ring is machined with two slots for compatibility with our selection of spanner wrenches.

 

Standard Retaining Rings: Ø30 mm to Ø1.5" (38.1 mm)

 

  • Standard Retaining Rings for Optics Ranging from Ø30 mm to Ø1.5"
  • Compatible with our Optic Mounts and Lens Tubes

Our Standard Retaining Rings, available in sizes to match our optic mounts and lens tubes, are designed to maximize the clear aperture while providing sufficient holding force. Securing an optic using a retaining ring is a stable method for holding the optic since the optic is retained along its entire edge instead of just at a few points. Each retaining ring is machined with two slots for compatibility with our selection of spanner wrenches.

 

Standard Retaining Rings: Ø39 mm to Ø2" (50.8 mm)

 

  • Standard Retaining Rings for Optics Ranging from Ø39 mm to Ø2"
  • Compatible with our Optic Mounts and Lens Tubes

Our Standard Retaining Rings, available in sizes to match our optic mounts and lens tubes, are designed to maximize the clear aperture while providing sufficient holding force. Securing an optic using a retaining ring is a stable method for holding the optic since the optic is retained along its entire edge instead of just at a few points. Each retaining ring is machined with two slots for compatibility with our selection of spanner wrenches.

 

Standard Retaining Rings: Ø75 mm to Ø4" (Ø101.6 mm)

 

  • Standard Retaining Rings for Optics Ranging from Ø75 mm to Ø4"
  • Compatible with our Optic Mounts and Lens Tubes

Our Standard Retaining Rings, available in sizes to match our optic mounts and lens tubes, are designed to maximize the clear aperture while providing sufficient holding force. Securing an optic using a retaining ring is a stable method for holding the optic since the optic is retained along its entire edge instead of just at a few points. Each retaining ring is machined with two slots for compatibility with our selection of spanner wrenches.

 

Stress-Free Retaining Rings

 

  • Design Provides Reduced Stress Clamping Action
  • Provides Light-Tight Seal Around an Optic
  • Compatible with our Optic Mounts and Lens Tubes

Our Stress-Free Retaining Rings are available with our standard SM05, SM1, or SM2 threadings. This design uses an O-ring made of Buna-N nitrile rubber to reduce the stress on the optic surface and completely seal out sources of stray light. Like our standard retaining rings, our stress-free retaining rings contain two slots for compatibility with our selection of spanner wrenches.

 

Plastic Retaining Rings

 

  • Provides Gentler Contact with an Optic's Surfaces than Standard Retaining Rings
  • Small Through Holes Accommodate SPW801 Adjustable Spanner Wrench

This SM1 Delrin (plastic) Retaining Ring provides gentler contact with the surface of an optic than our standard retaining rings. It is designed for use with our SPW801 Adjustable Spanner Wrench (not compatible with SPW909).

The SM1PRR is thicker than the SM1RR Standard Retaining Ring featured above [0.11" (2.8 mm) compared to 0.08" (2.0 mm)]. Please note that due to the increased thickness, the maximum optic thickness that can be accommodated inside our standard SM1-compatible mounts will be slightly diminished. In addition, the clear aperture of the SM1PRR is slightly reduced relative to the SM1RR [Ø0.80" (Ø20.3 mm) compared to Ø0.90" (Ø22.9 mm)].

ABOUT US

Our Mission is to accelerate the advancement of optical technology for precision measurements and their applications from the table tops of research laboratories to standard use in communication and high technology industries. Our aim is to serve our customers. Our hope is to create a place for highly skilled people in an open environment

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Tel               +966 35823441
Fax               +966 35823441
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