Socket Head Cap Screws (Bolts)
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What are Hex Socket Head Cap Screws?
A socket head cap screw is a type of bolt with a hexagonal recess in its head.
It is also commonly referred to as a cap bolt or cap screw.
By inserting a hex key into the hexagonal socket and applying torque across all six sides, the screw can be tightened with high strength and is less likely to loosen.
Compared to using a screwdriver or spanner, it requires less working space, making it suitable for installation in confined areas.
They are widely used in various fields, including industrial equipment and machinery.
The main types include:
1. Socket Head Cap Screws
This is the most common type, featuring a cylindrical head. It is suitable for applications requiring high strength and high torque.
2. Socket Button Head Screws
With a low-profile, rounded head, they are ideal for panels and exterior parts where appearance is important.
In addition, the curved head surface helps suppress electric field concentration at the edges, making them less likely to cause discharge or leakage than cap screws in high-voltage equipment or environments with a risk of discharge
(such as vacuum equipment, electron beam equipment, and X-ray equipment).
3. Socket Flat Head Screws
The flat, countersunk head allows a flush finish with the fastening surface, making them ideal for locations where a protruding head must be avoided.
4. Socket Set Screws (Hollow Set Screws, Grub Screws)
These screws consist only of a threaded section without a head and are used to secure or position components by pressing the tip against a mating part.
Related articles:What are Hex Socket Head Cap Screws (cap bolts)?
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| Part Name | High Strength Stainless Steel Socket Head Cap Screws - Specialized Chemical Polishing | High Strength Stainless Steel Socket Head Cap Screws - Surface Hardening | High Strength Stainless Steel Socket Head Cap Screws – Low Temperature Black Chrome Treatment | High Strength Stainless Steel Socket Head Cap Screws – PTFE Coating | Socket Head Cap Screws - SUS310S | Socket Head Cap Screws - SUH660 | Hex Socket Head Cap Screws - Titanium | Hex Socket Head Cap Screws - High Intensity Titanium Alloy | Hex Socket Head Cap Screws - Aluminum |
| Part Number | SNSLG-PC | SNSLG-PN | SNSLG-RY | SNSLG-TF | SNSJ | SNSU-AT | SNST | SNSTG | SNSA |
| Feature | High Strength (Strength Class 10.8 Equivalent) Low Outgas Non-magnetic |
High Strength (Strength Class 10.8 Equivalent) Heat Resistance Seizing Prevention |
High Strength (Strength Class 10.8 Equivalent) Non-magnetic Chemical Resistance Anti-reflection Seizing Prevention |
High Strength (Strength Class 10.8 Equivalent) Non-magnetic Chemical Resistance Seizing Prevention |
Heat Resistance Chemical Resistance |
Heat Resistance High Strength High Specific Strength |
Lightweight Nonmagnetic Chemical Resistance |
High Strength Lightweight Nonmagnetic Corrosion Resistance |
Lightweight |
| Price | From 19.55 USD | From 15.28 USD | From 11.68 USD | From 10.99 USD | From 12.54 USD | From 28.31 USD | From 7.53 USD | From 12.73 USD | From 18.96 USD |
| Material | SUS316L | SUS316L | SUS316L | SUS316L | SUS310S | SUH660 | Grade 2 Titanium | Grade 5 Titanium | A5056 |
| Surface Treatment | Special Chemical Polishing | Surface hardening treatment | Low temperature black chrome treatment | PTFE coating | - | - | Special Chemical Polishing | Special Chemical Polishing | - |
| Thread Size | M3 ~ M6 | M3 ~ M6 | M3 ~ M6 | M3 ~ M6 | M3 ~ M10 | M3 ~ M6 | M3 ~ M6 | M2 ~ M10 | M3 ~ M8 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SNSLG-M3-PC SNSLG-M4-PC SNSLG-M5-PC SNSLG-M6-PC | SNSLG-M3-PN SNSLG-M4-PN SNSLG-M5-PN SNSLG-M6-PN | SNSLG-M3-RY SNSLG-M4-RY SNSLG-M5-RY SNSLG-M6-RY | SNSLG-M3-TF SNSLG-M4-TF SNSLG-M5-TF SNSLG-M6-TF | SNSJ-M10 SNSJ-M3 SNSJ-M4 SNSJ-M5 SNSJ-M6 SNSJ-M8 | SNSU-M3-AT SNSU-M4-AT SNSU-M5-AT SNSU-M6-AT | SNST-M3 SNST-M4 SNST-M5 SNST-M6 | SNSTG-M10 SNSTG-M2 SNSTG-M2.5 SNSTG-M3 SNSTG-M4 SNSTG-M5 SNSTG-M6 SNSTG-M8 | SNSA-M3 SNSA-M4 SNSA-M5 SNSA-M6 SNSA-M8 |
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| Part Name | Socket Head Cap Captive Screws - Cleanroom Washed & Packaged | Socket Head Cap Captive Screws - Fluorine Coating | Socket Head Cap Captive Screws - Low Temperature Black Chrome Treatment | Socket Head Cap Captive Screws - PTFE Coating | Socket Head Cap Captive Screws with Small Head | Socket Head Cap Captive Screws with Ultra Low Small Head | Socket Head Cap Captive Screws - SUS316L | Socket Head Cap Captive Screws - High Intensity Stainless Steel | Socket Head Cap Captive Screws with Low Profile - 316L Stainless Steel |
| Part Number | SSC-UCL | SSC-FC | SSC-RY | SSC-TF | SSC-SD | SSCHS-SD | SSC-SNSL | SSC-SNSLG | SSC-SLHL |
| Feature | Captive/ Loss Prevention Cleanroom Washed & Packaged |
Seizing Prevention Captive / Loss Prevention |
Chemical Resistance Anti-reflection Seizing Prevention Captive / Loss Prevention |
Chemical Resistance Seizing Prevention Captive / Loss Prevention |
Small Head Space-saving Captive / Loss Prevention |
Ultra Low Small Head Space-saving Captive / Loss Prevention |
Non-magnetic Chemical Resistance Heat Resistance Captive / Loss Prevention |
High Strength (Strength Class 10.8 Equivalent) Heat Resistance Corrosion Resistance Non-magnetic Captive / Loss Prevention |
Captive / Loss Prevention Space-Saving Low Profile |
| Price | From 3.10 USD | From 4.29 USD | From 13.73 USD | From 13.04 USD | From 4.64 USD | From 6.53 USD | From 4.13 USD | From 4.81 USD | From 5.34 USD |
| Material | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUS316L | SUS316L | SUS316L |
| Surface Treatment | - | Fluorine coating | Low temperature black chrome treatment | PTFE coating | - | - | - | - | - |
| Thread Size | M3 ~ M8 | M3 ~ M8 | M3 ~ M8 | M3 ~ M8 | M3 ~ M8 | M3 ~ M8 | M3 ~ M8 | M3 ~ M6 | M3 ~ M6 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SSC-M3-UCL SSC-M4-UCL SSC-M5-UCL SSC-M6-UCL SSC-M8-UCL | SSC-M3-FC SSC-M4-FC SSC-M5-FC SSC-M6-FC SSC-M8-FC | SSC-M3-RY SSC-M4-RY SSC-M5-RY SSC-M6-RY SSC-M8-RY | SSC-M3-TF SSC-M4-TF SSC-M5-TF SSC-M6-TF SSC-M8-TF | SSC-M3-SD SSC-M4-SD SSC-M5-SD SSC-M6-SD SSC-M8-SD | SSCHS-M3-SD SSCHS-M4-SD SSCHS-M5-SD SSCHS-M6-SD SSCHS-M8-SD | SSC-SNSL-M3 SSC-SNSL-M4 SSC-SNSL-M5 SSC-SNSL-M6 SSC-SNSL-M8 | SSC-SNSLG-M3 SSC-SNSLG-M4 SSC-SNSLG-M5 SSC-SNSLG-M6 | SSC-SLHL-M3 SSC-SLHL-M4 SSC-SLHL-M5 SSC-SLHL-M6 |
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| Part Name | Self-Aligning Socket Head Cap Captive Screws with Guide Tip | Flanged Socket Head Cap Screws | Flanged Socket Head Cap Screws | Flanged Socket Head Cap Screws - Cleanroom Washed & Packaged | Flanged Socket Head Cap Screws with Nylon Patch | Flanged Socket Head Cap Screws - Specialized Chemical Polishing | Flanged Socket Head Cap Screws - Low Temperature Black Chrome Treatment | Flanged Socket Head Cap Screws - PTFE Coating | Vented Flanged Socket Head Cap Screws |
| Part Number | SSC-IG | SFS | SFSS | SFSS-UCL | SFSS-ALK | SFSS-PC | SFSS-RY | SFSS-TF | SVFSS |
| Feature | With Guide Seizing Prevention Captive/Loss Prevention |
Flanged | Flanged | Flanged Cleanroom Washed & Packaged |
Flanged Nylon Patch |
Flanged Low Outgas |
Flanged Chemical Resistance Anti-reflection Seizing Prevention |
Flanged Chemical Resistance Seizing Prevention |
With Flange |
| Price | From 3.78 USD | From 13.73 USD | From 13.73 USD | From 15.44 USD | From 23.68 USD | From 33.96 USD | From 12.36 USD | From 10.65 USD | From 96.02 USD |
| Material | SUSXM7 (Equivalent to SUS304) | Steel | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) |
| Surface Treatment | - | Ferrosoferric Oxide Film (Black) | - | - | - | Special Chemical Polishing | Low temperature black chrome treatment | PTFE coating | - |
| Thread Size | M3 ~ M8 | M6 ~ M12 | M4 ~ M8 | M4 ~ M8 | M4 ~ M8 | M4 ~ M8 | M4 ~ M8 | M4 ~ M8 | M4 ~ M8 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SSC-M3-IG SSC-M4-IG SSC-M5-IG SSC-M6-IG SSC-M8-IG | SFS-M10 SFS-M12 SFS-M6 SFS-M8 | SFSS-M4 SFSS-M5 SFSS-M6 SFSS-M8 | SFSS-M4-UCL SFSS-M5-UCL SFSS-M6-UCL SFSS-M8-UCL | SFSS-M4-ALK SFSS-M5-ALK SFSS-M6-ALK SFSS-M8-ALK | SFSS-M4-PC SFSS-M5-PC SFSS-M6-PC SFSS-M8-PC | SFSS-M4-RY SFSS-M5-RY SFSS-M6-RY SFSS-M8-RY | SFSS-M4-TF SFSS-M5-TF SFSS-M6-TF SFSS-M8-TF | SVFSS-M4 SVFSS-M5 SVFSS-M6 SVFSS-M8 |
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| Part Name | Vented Flanged Socket Head Cap Screws – Specialized Chemical Polishing | Vented Flanged Socket Head Cap Screws - Silver Plating | Flanged Socket Head Cap Captive Screws | Socket Button Head Cap Screws | Socket Button Head Cap Screws | Socket Button Head Cap Screws - Inch Thread | Socket Button Head Cap Screws with Flange | Socket Button Head Cap Screws with Flange - Electroless Nickel Plating | Socket Button Head Cap Screws with Flange |
| Part Number | SVFSS-PC | SVFSS-AG | SSC-SFSS | SNB | SNBS | SNBS(INCH) | SFB | SFB-EL | SFBS |
| Feature | With Flange Low Outgas |
With Flange Seizing Prevention |
Flanged Captive/Loss Prevention |
Socket Button Head Cap Screws | Socket Button Head Cap Screws | Inch Thread Button Head CapScrews |
With Flange Space-saving |
With Flange Space-saving |
With Flange Space-saving |
| Price | From 106.31 USD | From 12.18 USD | From 2.92 USD | From 9.62 USD | From 9.62 USD | From 13.04 USD | From 9.09 USD | From 11.07 USD | From 12.79 USD |
| Material | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | Steel | Stainless Steel | Equivalent to SUS304 | Steel | Steel | SUSXM7 (Equivalent to SUS304) |
| Surface Treatment | Special Chemical Polishing | Silver plating | - | Ferrosoferric Oxide Film (Black) | - | - | Ferrosoferric Oxide Film (Black) | Electroless nickel plating | - |
| Thread Size | M4 ~ M8 | M4 ~ M8 | M4 ~ M8 | M3 ~ M10 | M3 ~ M8 | No.4-40UNC ~ 1/4-20UNC | M3 ~ M8 | M3 ~ M8 | M3 ~ M6 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
| List | SVFSS-M4-PC SVFSS-M5-PC SVFSS-M6-PC SVFSS-M8-PC | SVFSS-M4-AG SVFSS-M5-AG SVFSS-M6-AG SVFSS-M8-AG | SSC-SFSS-M4 SSC-SFSS-M5 SSC-SFSS-M6 SSC-SFSS-M8 | SNB-M10 SNB-M3 SNB-M4 SNB-M5 SNB-M6 SNB-M8 | SNBS-M3 SNBS-M4 SNBS-M5 SNBS-M6 SNBS-M8 | SNBS-#10-24 SNBS-#10-32 SNBS-#4-40 SNBS-#5-40 SNBS-#6-32 SNBS-#8-32 SNBS-1/4-20 | SFB-M3 SFB-M4 SFB-M5 SFB-M6 SFB-M8 | SFB-M3-EL SFB-M4-EL SFB-M5-EL SFB-M6-EL SFB-M8-EL | SFBS-M3 SFBS-M4 SFBS-M5 SFBS-M6 |






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