Products HomeSocket Head Cap Screws & Nuts, Steel
- Imperial Sizes: 2-56, 4-40, 8-32, and 1/4"-20
- Metric Sizes: M3 x 0.5, M4 x 0.7, and M6 x 1.0
- Vented, Vacuum-Compatible Cap Screws Available
- Nuts, Washers, and Counterbore Adapters Also Available
SH25S075
1/4"-20 Cap Screws,
3/4" Long
SH6MS16V
Vented, Vacuum-Compatible
M6 Cap Screws, 16 mm Long
SH3M8
M3 x 0.5 Cap Screws,
8 mm Long
W8S038
#8 Washers
SH8S15
8-32 Cap Screws
1.5" Long
N25S0440
1/4"-20 Nuts
Please Wait
| Screws Selection Guide |
|---|
| Cap Screws & Nuts |
| Setscrews and Thumbscrews |
| Low Profile Screws & T-Nuts |
| Thread Adapter Screws |
| Screw Kits |
| Balldrivers and Hex Keys |
| Quick Links | |
|---|---|
| Imperial | Metric |
| 2-56 | - |
| 4-40 | M3 x 0.5 |
| 8-32 (Standard or Vented) |
M4 x 0.7 (Standard or Vented) |
| 1/4"-20 (Standard or Vented) |
M6 x 1.0 (Standard or Vented) |
| 8-32, M4 x 0.7, 1/4"-20, and M6 x 1.0 Nuts | |
| 1/4" (M6) to #8 (M4) Counterbore Adapter | |
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 8-32, M4 x 0.7, 1/4"-20, and M6 x 1.0 Cap Screws Available
- 8-32, M4 x 0.7, 1/4"-20, and M6 x 1.0 Nuts
- #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, nuts, 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.
| Posted Comments: | |
user
(posted 2022-02-04 12:34:16.433) Hi,
We can buy the same nuts from McMaster pack of 100 for $ 5.07.
https://www.mcmaster.com/91841A009/
Why these are so expensive... jdelia
(posted 2022-02-04 03:49:40.0) Thank you for contacting Thorlabs. Our goal is to be a one-stop shop for photonics tools and accessories to optimize convenience for our customers. Although we might not make certain components in-house, we keep them in our inventory to offer them alongside other products with which they can be best utilized. However, we can only afford to sell these with a markup due to labor costs including shipping and handling. That being said, we can certainly look into making our prices more affordable. Cheryl Vorvick
(posted 2021-04-22 14:30:59.057) I need to know the dimensions of the head of the screw.
Maybe I missed the note that says "here are the dimensions?"
Having a drawing of every screw is probably a lot of work, but for me, without those dimensions I can't buy your screws, I have to keep looking. YLohia
(posted 2021-04-22 03:12:16.0) Hello, the head of the SH25S075V screw that you inquired about has a diameter of 0.375" +0.000"/-0.021" and a height of 0.247" +/-0.003. david.vogt
(posted 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. tfrisch
(posted 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. iain
(posted 2015-01-12 12:54:38.913) What is the inner diameter and outer diameter of the 1/4"-20 (M6 compatible) washer W25S050? cdaly
(posted 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. iain
(posted 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 sharrell
(posted 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. user
(posted 2013-09-20 16:05:58.097) Could you sell M4x0.7x16mm cap screws (i.e. similar to say SH4MS12 but 16mm long). jlow
(posted 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. |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH2S019 | 3/16" (4.8 mm) | 3/32" | 18-8 Stainless Steel | 50 |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH4S019 | 3/16" (4.8 mm) | 3/32" | 18-8 Stainless Steel | 50 |
| SH4S025 | 1/4" (6.4 mm) | |||
| SH4S031 | 5/16" (7.9 mm) | |||
| SH4S038 | 3/8" (9.5 mm) |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH3M5 | 5 mm (0.20") | 2.5 mm | 18-8 Stainless Steel | 50 |
| SH3M06 | 6 mm (0.24") | Grade 8 Alloy Steel with Black Oxide Coating |
||
| SH3M8 | 8 mm (0.31") | |||
| SH3M10 | 10 mm (0.39") |
ZoomPlease 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.
| Item # | Total Shank Length | Threaded Length | Hex | Material | Quantity |
|---|---|---|---|---|---|
| SH8S025 | 1/4" (6.4 mm) | 1/4" (6.4 mm) | 9/64" | 18-8 Stainless Steel | 50 |
| SH8S031 | 5/16" (7.9 mm) | 5/16" (7.9 mm) | |||
| SH8S038 | 3/8" (9.5 mm) | 3/8" (9.5 mm) | |||
| SH8S050 | 1/2" (12.7 mm) | 1/2" (12.7 mm) | |||
| SH8S0625 | 5/8" (15.9 mm) | 5/8" (15.9 mm) | |||
| SH8S075 | 3/4" (19.1 mm) | 3/4" (19.1 mm) | |||
| SH8S100 | 1" (25.4 mm) | 1" (25.4 mm) | |||
| SH8S1250 | 1.25" (31.8 mm) | 0.95" (24.1 mm) | |||
| SH8S15 | 1.5" (38.1 mm) | 1.15" (29.2 mm) |
Cap Screw Dimensions
| Item # | Outer Diameter | Inner Diameter | Thickness | Material | Quantity |
|---|---|---|---|---|---|
| W8S038 | 0.375" +0.008"/-0.005" | 0.172" +0.008"/-0.005" (#8 and M4 Compatible) | 0.032" ± 0.008" | 18-8 Stainless Steel | 100 |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH8S038V | 3/8" (9.5 mm) | 9/64" | 316 Stainless Steel | 5 |
| SH8S050V | 1/2" (12.7 mm) |
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.
ZoomPlease 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.
| Item # | Total Shank Length | Threaded Length | Hex | Material | Quantity |
|---|---|---|---|---|---|
| SH4MS06 | 6 mm (0.24") | 6 mm (0.24") | 3 mm | 18-8 Stainless Steel | 50 |
| SH4MS08 | 8 mm (0.31") | 8 mm (0.31") | |||
| SH4MS10 | 10 mm (0.39") | 10 mm (0.39") | |||
| SH4MS12 | 12 mm (0.47") | 12 mm (0.47") | |||
| SH4MS16 | 16 mm (0.63") | 16 mm (0.63") | |||
| SH4MS20 | 20 mm (0.79") | 20 mm (0.79") | |||
| SH4MS25 | 25 mm (0.98") | 25 mm (0.98") | |||
| SH4MS30 | 30 mm (1.18") | 20.2 mm (0.80") | |||
| SH4MS40 | 40 mm (1.57") | 20.2 mm (0.80") |
Cap Screw Dimensions
| Item # | Outer Diameter | Inner Diameter | Thickness | Material | Quantity |
|---|---|---|---|---|---|
| W8S038 | 0.375" ± 0.15" | 0.174" ± 0.15" (#8 and M4 Compatible) | 0.031" ± 0.15" | 18-8 Stainless Steel | 100 |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH4MS10V | 10 mm (0.39") | 3 mm | A4 Stainless Steel | 5 |
| SH4MS12V | 12 mm (0.47") |
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.
ZoomPlease 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.
| Item #a | Total Shank Length | Threaded Length | Hex | Material | Quantity |
|---|---|---|---|---|---|
| SH25S025b | 1/4" (6.4 mm) | 1/4" (6.4 mm) | 3/16" | 18-8 Stainless Steel | 25 |
| SH25S038 | 3/8" (9.5 mm) | 3/8" (9.5 mm) | |||
| SH25S050 | 1/2" (12.7 mm) | 1/2" (12.7 mm) | |||
| SH25S063 | 5/8" (15.9 mm) | 5/8" (15.9 mm) | |||
| SH25S075 | 3/4" (19.1 mm) | 3/4" (19.1 mm) | |||
| SH25S100 | 1" (25.4 mm) | 1" (25.4 mm) | |||
| SH25S1250 | 1.25" (31.8 mm) | 1.25" (31.8 mm) | |||
| SH25S15 | 1.5" (38.1 mm) | 1.07" (27.2 mm) | |||
| SH25S200 | 2" (50.8 mm) | 1.12" (28.4 mm) |
Cap Screw Dimensions
| Item # | Outer Diameter | Inner Diameter | Thickness | Material | Quantity |
|---|---|---|---|---|---|
| W25S050 | 0.500" ± 0.010" | 0.265" ± 0.010" (1/4" and M6 Compatible) | 0.062" ± 0.010" | 18-8 Stainless Steel | 100 |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH25S038V | 3/8" (9.5 mm) | 3/16" | 316 Stainless Steel | 5 |
| SH25S050V | 1/2" (12.7 mm) | |||
| SH25S063V | 5/8" (15.9 mm) | |||
| SH25S075V | 3/4" (19.1 mm) | |||
| SH25S100V | 1" (25.4 mm) |
| Item # | Outer Diameter | Inner Diameter | Thickness | Material | Quantity |
|---|---|---|---|---|---|
| W25S050V | 0.505" ± 0.10" | 0.286" ± 0.10" (1/4" and M6 Compatible) | 0.064" ± 0.007" | 316 Stainless Steel | 25 |
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.
ZoomPlease 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.
| Item #a | Total Shank Length | Threaded Length | Hex | Material | Quantity |
|---|---|---|---|---|---|
| SH6MS06b | 6 mm (0.24") | 6 mm (0.24") | 5 mm | 18-8 Stainless Steel | 25 |
| SH6MS10 | 10 mm (0.39") | 10 mm (0.39") | |||
| SH6MS12 | 12 mm (0.47") | 12 mm (0.47") | |||
| SH6MS16 | 16 mm (0.63") | 16 mm (0.63") | |||
| SH6MS20 | 20 mm (0.79") | 20 mm (0.79") | |||
| SH6MS25 | 25 mm (0.98") | 25 mm (0.98") | |||
| SH6MS30 | 30 mm (1.18") | 30 mm (1.18") | |||
| SH6MS35 | 35 mm (1.38") | 25.2 mm (0.99") | |||
| SH6MS45 | 45 mm (1.77") | 25.5 mm (1.00") | |||
| SH6MS50 | 50 mm (1.97") | 25.5 mm (1.00") |
Cap Screw Dimensions
| Item # | Outer Diameter | Inner Diameter | Thickness | Material | Quantity |
|---|---|---|---|---|---|
| W25S050 | 0.500" ± 0.010" | 0.265" ± 0.010" (1/4" and M6 Compatible) | 0.062" ± 0.010" | 18-8 Stainless Steel | 100 |
Zoom| Item # | Total Shank Length | Hex | Material | Quantity |
|---|---|---|---|---|
| SH6MS10V | 10 mm (0.39") | 5 mm | A4 Stainless Steel | 5 |
| SH6MS12V | 12 mm (0.47") | |||
| SH6MS16V | 16 mm (0.63") | |||
| SH6MS20V | 20 mm (0.79") | |||
| SH6MS25V | 25 mm (0.98") |
| Item # | Outer Diameter | Inner Diameter | Thickness | Material | Quantity |
|---|---|---|---|---|---|
| W25S050V | 0.505" ± 0.100" | 0.286" ± 0.100" (1/4" and M6 Compatible) | 0.064" ± 0.007" | 316 Stainless Steel | 25 |
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.
Zoom| Item # | Thread | Thickness | Hex | Material | Qty. |
|---|---|---|---|---|---|
| N8S0340 | 8-32 | 0.13" | 11/32" | 18-8 Stainless Steel | 50 |
| N25S0440 | 1/4"-20 | 0.22" | 7/16" | ||
| N4MS07 | M4 x 0.7 | 3.2 mm | 7 mm | ||
| N6MS010 | M6 x 1.0 | 5.0 mm | 10 mm |
- Nuts for use with Cap Screws or Bolts
- Available Threads: 8-32, 1/4"-20, M4 x 0.7, or M6 x 1.0
- Sold in Packs of 50
We offer stainless steel nuts for retaining cap screws in unthreaded bores.
Zoom
Cross Section of RC2 Rail Carrier with Included SD1 Counterbore Adapter Ring
- 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.
Cap Screws & Nuts