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Socket Head Cap Screws, Stainless Steel![]()
SH25S075 1/4"-20 Cap Screws, SH6MS16V Vented, Vacuum-Compatible SH3M8 M3 x 0.5 Cap Screws, W8S038 #8 Washers SH8S15 8-32 Cap Screws ![]() Please Wait
Features
Cap screws are an essential part of any lab setup. On this page, Thorlabs offers standard cap screws and washers in many popular sizes, plus vented, vacuum-compatible 8-32, M4 x 0.7, 1/4"-20, and M6 x 1.0 cap screws. We also offer setscrews and thumbscrews, low-profile screws, screw kits, and balldrivers / hex keys.
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![]() Please note that for 1.25" and 1.5" long screws, the threading does not extend the total length of the shank (see image to the bottom left); the threaded length and total shank length for each screw are provided in the table below.
![]() Cap Screw Dimensions
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![]() Click to Enlarge These Cap Screws Have a Central Ø0.042" (Ø1.1 mm) Vent These cap screws are constructed from 316 stainless steel and chemically cleaned and prepared for vacuum applications before packaging. They also have a central Ø0.042" (Ø1.1 mm) hole through the body of the screw to serve as a vent, allowing excess gas to escape from a blind hole when a vacuum chamber is pumped down. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the stainless steel. 316 Stainless Steel outgasses at a rate of 1.8 x 10-8 Torr-Liters/s/cm2. The material properties of the stainless steel and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr. These cap screws are packaged in double airtight bags for cleanroom and vacuum chamber applications. We also offer additional vacuum-compatible Ø1/2" post system components. ![]() Please note that for 30 mm and 40 mm long screws, the threading does not extend the total length of the shank (see image to the bottom left); the threaded length and total shank length for each screw are provided in the table below.
![]() Cap Screw Dimensions
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![]() Click to Enlarge These Cap Screws Have a Central Ø1.0 mm (Ø0.04") Vent These cap screws are constructed from A4 stainless steel and chemically cleaned and prepared for vacuum applications before packaging. They also have a central Ø1.0 mm (Ø0.04") hole through the body of the screw to serve as a vent, allowing excess gas to escape from a blind hole when a vacuum chamber is pumped down. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the stainless steel. A4 Stainless Steel outgasses at a rate of 1.8 x 10-8 Torr-Liters/s/cm2. The material properties of the stainless steel and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr. These cap screws are packaged in double airtight bags for cleanroom and vacuum chamber applications. We also offer additional vacuum-compatible Ø1/2" post system components. ![]() Please note that for 1.5" and 2" long screws, the threading does not extend the total length of the shank (see image to the bottom left); the threaded length and total shank length for each screw are provided in the table below.
![]() Cap Screw Dimensions
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![]() Click to Enlarge These Cap Screws Have a Central Ø0.0625" (Ø1.6 mm) Vent These cap screws are constructed from 316 stainless steel and chemically cleaned and prepared for vacuum applications before packaging. They also have a central Ø0.0625" (Ø1.6 mm) hole through the body of the screw to serve as a vent, allowing excess gas to escape from a blind hole when a vacuum chamber is pumped down. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the stainless steel, which is 1.8 x 10-8 Torr-Liters/s/cm2. The material properties of the stainless steel and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr. These cap screws are packaged in double airtight bags for cleanroom and vacuum chamber applications. We also offer additional vacuum-compatible Ø1/2" post system components. ![]() Please note that for 35 mm and longer screws, the threading does not extend the total length of the shank (see image to the bottom left); the threaded length and total shank length for each screw are provided in the table below.
![]() Cap Screw Dimensions
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![]() Click to Enlarge These Cap Screws Have a Central Ø0.0625" (Ø1.6 mm) Vent These cap screws are constructed from A4 stainless steel and chemically cleaned and prepared for vacuum applications before packaging. They also have a central Ø0.0625" (Ø1.6 mm) hole through the body of the screw to serve as a vent, allowing excess gas to escape from a blind hole when a vacuum chamber is pumped down. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the stainless steel, which is 1.8 x 10-8 Torr-Liters/s/cm2. The material properties of the stainless steel and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr. These cap screws are packaged in double airtight bags for cleanroom and vacuum chamber applications. We also offer additional vacuum-compatible Ø1/2" post system components. ![]() ![]() Cross Section of RC2 Rail Carrier with Included SD1 Counterbore Adapter Ring
The SD1 stainless steel adapter ring allows an 8-32 or M4 cap screw to be used within the 1/4" or M6 counterbores found on many optomechanical components. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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