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Socket Head Cap Screws, Stainless Steel


  • 2-56, 4-40, M3 x 0.5, 8-32, M4 x 0.7, 1/4"-20, and M6 x 1.0
    Socket Head Cap Screws
  • Vented, Vacuum-Compatible Cap Screws
  • #8 (M4) to 1/4" (M6) Counterbore Adapters
  • 1/4" and #8 Washers

SH25S075

1/4"-20 Cap Screw,
3/4" Long

SH6MS16V

Vented, Vacuum-Compatible
M6 Cap Screw, 16 mm Long

SH3M8

M3 x 0.5 Cap Screw,
8 mm Long

W8S038

#8 Washer

SH8S038

8-32 Cap Screw
3/8" Long

Related Items


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Features

  • 2-56, 4-40, M3 x 0.5, 8-32, M4 x 0.7, 1/4"-20, and M6 x 1.0 Socket Head Cap Screws
  • Stainless or Alloy Steel Construction
  • Vented, Vacuum-Compatible 1/4"-20 and M6 x 1.0 Cap Screws Available
  • #8 (M4) to 1/4" (M6) Counterbore Adapters Also Available
  • Ideal for Replenishing our Hardware Kits

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 1/4"-20 and M6 cap screws. We also offer setscrews and thumbscrews, low-profile screws, screw kits, and balldrivers / hex keys.


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Posted Comments:
Poster:david.vogt
Posted Date:2018-01-22 11:10:48.997
Hello, I have a quick question concerning the 4-40 cap screws. I want to fix a thin plate to a cage system, and in order to do this, I am thinking of using these 4-40 cap screws. However, I could not find the depth of the 4-40 hole in the cage rods anywhere, so I don't know which length to use. Will the SH4S019 be fine, or will it be too short if my metal plate is about 1 mm thick? Will the SH4S025 be too long to properly tighten it? Thank you for your help.
Poster:tfrisch
Posted Date:2018-01-24 03:09:17.0
Hello, thank you for contacting Thorlabs. The 4-40 screw we use in the extension rods is 1/4" long and protrudes about 0.1" (±10%), so the thread depth is about 0.15" ±0.01". If your plate is about 1mm thick (~0.04"), the longest screw you could use would be about 0.18" - 0.20" long. SH4S025 will be too long and SH4S019 will be really close with the tolerances. I will reach out to discuss your application directly as the thickness of your plate matters quite a bit here.
Poster:iain
Posted Date:2015-01-12 12:54:38.913
What is the inner diameter and outer diameter of the 1/4"-20 (M6 compatible) washer W25S050?
Poster:cdaly
Posted Date:2015-01-12 04:59:08.0
Response from Chris at Thorlabs: For the W25S050 washer, the inner and outer diameters are 0.265" and 0.500" respectively.
Poster:iain
Posted Date:2014-01-09 06:24:31.43
Could you show the lengths of imperial screws in millimetres as well as inches. e.g. SH4S019 4-40, 3/16" (4.8 mm) long
Poster:sharrell
Posted Date:2014-01-17 08:41:31.0
Response from Sean at Thorlabs: Thank you for your suggestion, we are adding the metric or imperial conversions of the screw lengths to the webpage now.
Poster:
Posted Date:2013-09-20 16:05:58.097
Could you sell M4x0.7x16mm cap screws (i.e. similar to say SH4MS12 but 16mm long).
Poster:jlow
Posted Date:2013-09-20 10:13:00.0
Response from Jeremy at Thorlabs: We do not stock the 16mm long version of the M4 cap screws. We will look into the possibility of carrying this in the future.

2-56 Stainless Steel Cap Screws

Item # Length Hex Material Quantity
SH2S019 3/16" (4.8 mm) 3/32" 18-8 Stainless Steel 50
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
SH2S019 Support Documentation
SH2S019Customer Inspired!2-56 Stainless Steel Cap Screw, 3/16" Long, Pack of 50
$8.36
Today

4-40 Stainless Steel Cap Screws

Item #LengthHexMaterialQuantity
SH4S0193/16" (4.8 mm)3/32"18-8 Stainless Steel50
SH4S0251/4" (6.4 mm)50
SH4S0315/16" (7.9 mm)50
SH4S0383/8" (9.5 mm)50

We also offer the HW-KIT5 4-40 cap screw kit.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
SH4S019 Support Documentation
SH4S019Customer Inspired!4-40 Stainless Steel Cap Screw, 3/16" Long, Pack of 50
$7.55
Today
SH4S025 Support Documentation
SH4S025Customer Inspired!4-40 Stainless Steel Cap Screw, 1/4" Long, Pack of 50
$7.55
Today
SH4S031 Support Documentation
SH4S031Customer Inspired!4-40 Stainless Steel Cap Screw, 5/16" Long, Pack of 50
$7.80
Today
SH4S038 Support Documentation
SH4S038Customer Inspired!4-40 Stainless Steel Cap Screw, 3/8" Long, Pack of 50
$8.36
Today

M3 x 0.5 Stainless Steel and Alloy Steel Cap Screws

Item #LengthHexMaterialQuantity
SH3M55 mm (0.20")2.5 mm18-8 Stainless Steel50
SH3M066 mm (0.24")Grade 8 Alloy Steel
with Black Oxide Coating
50
SH3M88 mm (0.31")50
SH3M1010 mm (0.39")50

We also offer the HW-KIT5/M M3 cap screw kit.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available / Ships
SH3M5 Support Documentation
SH3M5Customer Inspired!M3 x 0.5 Stainless Steel Cap Screw, 5 mm Long, Pack of 50
$7.80
Today
SH3M06 Support Documentation
SH3M06Customer Inspired!M3 x 0.5 Alloy Steel Cap Screw, 6 mm Long, Pack of 50
$7.55
Today
SH3M8 Support Documentation
SH3M8Customer Inspired!M3 x 0.5 Alloy Steel Cap Screw, 8 mm Long, Pack of 50
$7.80
Today
SH3M10 Support Documentation
SH3M10Customer Inspired!M3 x 0.5 Alloy Steel Cap Screw, 10 mm Long, Pack of 50
$8.36
Today

8-32 Stainless Steel Cap Screws

Item #LengthHexMaterialQuantity
SH8S0251/4" (6.4 mm)9/64"18-8 Stainless Steel50
SH8S0383/8" (9.5 mm)50
SH8S0501/2" (12.7 mm)50
SH8S0753/4" (19.1 mm)50
SH8S1001" (25.4 mm)50
W8S038#8 Washer (M4 Compatible)100

We also offer the HW-KIT1 8-32 cap screw kit.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
SH8S025 Support Documentation
SH8S025Customer Inspired!8-32 Stainless Steel Cap Screw, 1/4" Long, Pack of 50
$6.27
Today
SH8S038 Support Documentation
SH8S038Customer Inspired!8-32 Stainless Steel Cap Screw, 3/8" Long, Pack of 50
$6.53
Today
SH8S050 Support Documentation
SH8S050Customer Inspired!8-32 Stainless Steel Cap Screw, 1/2" Long, Pack of 50
$6.78
Today
SH8S075 Support Documentation
SH8S075Customer Inspired!8-32 Stainless Steel Cap Screw, 3/4" Long, Pack of 50
$7.29
Today
SH8S100 Support Documentation
SH8S100Customer Inspired!8-32 Stainless Steel Cap Screw, 1" Long, Pack of 50
$7.80
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
W8S038 Support Documentation
W8S038Customer Inspired!#8 Washer, M4 Compatible, Stainless Steel, Pack of 100
$3.39
Today

M4 x 0.7 Stainless Steel Cap Screws

Item #LengthHexMaterialQuantity
SH4MS066 mm (0.24")3 mm18-8 Stainless Steel50
SH4MS1010 mm (0.39")50
SH4MS1212 mm (0.47")50
SH4MS1616 mm (0.63")50
SH4MS2020 mm (0.79")50
SH4MS2525 mm (0.98")50
W8S038#8 Washer (M4 Compatible)100

We also offer the HW-KIT1/M M4 cap screw kit.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
W8S038 Support Documentation
W8S038Customer Inspired!#8 Washer, M4 Compatible, Stainless Steel, Pack of 100
$3.39
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
SH4MS06 Support Documentation
SH4MS06Customer Inspired!M4 x 0.7 Stainless Steel Cap Screw, 6 mm Long, Pack of 50
$6.48
Today
SH4MS10 Support Documentation
SH4MS10Customer Inspired!M4 x 0.7 Stainless Steel Cap Screw, 10 mm Long, Pack of 50
$6.73
Today
SH4MS12 Support Documentation
SH4MS12Customer Inspired!M4 x 0.7 Stainless Steel Cap Screw, 12 mm Long, Pack of 50
$6.99
Today
SH4MS16 Support Documentation
SH4MS16Customer Inspired!M4 x 0.7 Stainless Steel Cap Screw, 16 mm Long, Pack of 50
$7.04
Today
SH4MS20 Support Documentation
SH4MS20Customer Inspired!M4 x 0.7 Stainless Steel Cap Screw, 20 mm Long, Pack of 50
$7.55
Today
SH4MS25 Support Documentation
SH4MS25Customer Inspired!M4 x 0.7 Stainless Steel Cap Screw, 25 mm Long, Pack of 50
$7.80
Today

1/4"-20 Stainless Steel Cap Screws

Item #aLengthHexMaterialQuantity
SH25S025b1/4" (6.4 mm)3/16"18-8 Stainless Steel25
SH25S0383/8" (9.5 mm)25
SH25S0501/2" (12.7 mm)25
SH25S0635/8" (15.9 mm)25
SH25S0753/4" (19.1 mm)25
SH25S1001" (25.4 mm)25
SH25S2002" (50.8 mm)25
W25S0501/4" Washer (M6 Compatible)100
  • We also offer the HW-KIT2 1/4"-20 cap screw kit.
  • The price for these screws is higher due to the uncommon length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
SH25S025 Support Documentation
SH25S0251/4"-20 Stainless Steel Cap Screw, 1/4" Long, Pack of 25
$12.85
Today
SH25S038 Support Documentation
SH25S038Customer Inspired!1/4"-20 Stainless Steel Cap Screw, 3/8" Long, Pack of 25
$7.80
Today
SH25S050 Support Documentation
SH25S0501/4"-20 Stainless Steel Cap Screw, 1/2" Long, Pack of 25
$8.11
Today
SH25S063 Support Documentation
SH25S063Customer Inspired!1/4"-20 Stainless Steel Cap Screw, 5/8" Long, Pack of 25
$8.36
Today
SH25S075 Support Documentation
SH25S075Customer Inspired!1/4"-20 Stainless Steel Cap Screw, 3/4" Long, Pack of 25
$8.87
Today
SH25S100 Support Documentation
SH25S100Customer Inspired!1/4"-20 Stainless Steel Cap Screw, 1" Long, Pack of 25
$9.89
Today
SH25S200 Support Documentation
SH25S200Customer Inspired!1/4"-20 Stainless Steel Cap Screw, 2" Long, Pack of 25
$12.95
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
W25S050 Support Documentation
W25S050Customer Inspired!1/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
$4.68
Today

Vented, Vacuum-Compatible 1/4"-20 Cap Screws

Item # Length Hex Material Quantity
SH25S038V 3/8" (9.5 mm) 3/16" 316 Stainless Steel 5
SH25S050V 1/2" (12.7 mm) 5
SH25S063V 5/8" (15.9 mm) 5
SH25S075V 3/4" (19.1 mm) 5
SH25S100V 1" (25.4 mm) 5
W25S050V 1/4" Washer (M6 Compatible) 25
Vented Cap Screw
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 screw are packaged in double airtight bags for cleanroom and vacuum chamber applications. We also offer additional vacuum-compatible Ø1/2" post system components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
SH25S038V Support Documentation
SH25S038V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 3/8” Long, 5 Pack
$9.99
Today
SH25S050V Support Documentation
SH25S050V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 1/2” Long, 5 Pack
$11.64
Today
SH25S063V Support Documentation
SH25S063V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 5/8” Long, 5 Pack
$12.15
Today
SH25S075V Support Documentation
SH25S075V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 3/4” Long, 5 Pack
$14.21
Today
SH25S100V Support Documentation
SH25S100V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 1” Long, 5 Pack
$20.50
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
W25S050V Support Documentation
W25S050V1/4" (M6) Vacuum-Compatible Washer, 316 Stainless, 25 Pack
$7.29
Today

M6 x 1.0 Stainless Steel Cap Screws

Item #aLengthHexMaterialQuantity
SH6MS06b6 mm (0.24")5 mm18-8 Stainless Steel25
SH6MS1010 mm (0.39")25
SH6MS1212 mm (0.47")25
SH6MS1616 mm (0.63")25
SH6MS2020 mm (0.79")25
SH6MS2525 mm (0.98")25
SH6MS5050 mm (1.97")25
W25S0501/4" Washer (M6 Compatible)100
  • We also offer the HW-KIT2/M M6 cap screw kit.
  • The price for these screws is higher due to the uncommon length.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
W25S050 Support Documentation
W25S050Customer Inspired!1/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
$4.68
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
SH6MS06 Support Documentation
SH6MS06M6 x 1.0 Stainless Steel Cap Screw, 6 mm Long, Pack of 25
$12.85
Today
SH6MS10 Support Documentation
SH6MS10Customer Inspired!M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, Pack of 25
$7.80
Today
SH6MS12 Support Documentation
SH6MS12Customer Inspired!M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, Pack of 25
$8.11
Today
SH6MS16 Support Documentation
SH6MS16Customer Inspired!M6 x 1.0 Stainless Steel Cap Screw, 16 mm Long, Pack of 25
$8.36
Today
SH6MS20 Support Documentation
SH6MS20Customer Inspired!M6 x 1.0 Stainless Steel Cap Screw, 20 mm Long, Pack of 25
$8.87
Today
SH6MS25 Support Documentation
SH6MS25Customer Inspired!M6 x 1.0 Stainless Steel Cap Screw, 25 mm Long, Pack of 25
$9.89
Today
SH6MS50 Support Documentation
SH6MS50Customer Inspired!M6 x 1.0 Stainless Steel Cap Screw, 50 mm Long, Pack of 25
$12.95
Today

Vented, Vacuum-Compatible M6 x 1.0 Cap Screws

Item # Length Hex Material Quantity
SH6MS10V 10 mm (0.39") 5 mm A4 Stainless Steel 5
SH6MS12V 12 mm (0.47") 5
SH6MS16V 16 mm (0.63") 5
SH6MS20V 20 mm (0.79") 5
SH6MS25V 25 mm (0.98") 5
W25S050V 1/4" Washer (M6 Compatible) 316 Stainless Steel 25
Vented Cap Screw
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 screw are packaged in double airtight bags for cleanroom and vacuum chamber applications. We also offer additional vacuum-compatible Ø1/2" post system components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
W25S050V Support Documentation
W25S050V1/4" (M6) Vacuum-Compatible Washer, 316 Stainless, 25 Pack
$7.29
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
SH6MS10V Support Documentation
SH6MS10VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 10 mm Long, 5 Pack
$7.36
Today
SH6MS12V Support Documentation
SH6MS12VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 12 mm Long, 5 Pack
$12.26
Today
SH6MS16V Support Documentation
SH6MS16VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 16 mm Long, 5 Pack
$13.18
Today
SH6MS20V Support Documentation
SH6MS20VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 20 mm Long, 5 Pack
$16.69
Today
SH6MS25V Support Documentation
SH6MS25VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 25 mm Long, 5 Pack
$23.69
Today

Counterbore Adapter for Cap Screws

SD1 Adapter Ring in RC1 Rail Carrier
SD1 Adapter Ring in the Counterbore of an RC1 Dovetail Rail Carrier
  • Use an 8-32 or M4 Cap Screw in a 1/4" or M6 Counterbore
  • Package of 10 Adapters

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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SD1 Support Documentation
SD11/4" (M6) Counterbore Adapter Ring for 8-32 (M4) Screws, 10 per Pack
$7.91
Today
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