Socket Head Cap Screws (Bolts)
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)?
Selection Conditions
- Select screw length（mm）45
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| Part Name | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws |
| Part Number | SNS-M6-45 | SNS-M8-45 | SNS-M10-45 | SNS-M12-45 | SNS-M16-45 | SNS-M6-45-TZB | SNS-M8-45-TZB | SNS-M10-45-TZB | SNS-M12-45-TZB |
| Feature | Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
| Material | Steel | Steel | Steel | Steel | Steel | Steel | Steel | Steel | Steel |
| Thread Size | M6 | M8 | M10 | M12 | M16 | M6 | M8 | M10 | M12 |
| Length | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
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| Part Name | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws | Socket Head Cap Screws / Fine Thread | Socket Head Cap Screws / Fine Thread | Hex Socket Head Cap Screws - Fine Pitch Thread | Hex Socket Head Cap Screws - Fine Pitch Thread | Hex Socket Head Cap Screws - Fine Pitch Thread | Hex Socket Head Cap Screws - Full Thread |
| Part Number | SNS-M16-45-TZB | SNSS-M12-45 | SNSS-M16-45 | SNS-M12-P1.25-45 | SNS-M16-P1.5-45 | SNSS-M8-P1-45 | SNSS-M10-P1-45 | SNSS-M12-P1-45 | SNSS-M3-45-FT |
| Feature | Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Hex Socket Head Cap Screws Conforming to JIS B 1176 |
Positioning Loosening Countermeasures Conforming to JIS B 1176 |
Positioning Loosening Countermeasures Conforming to JIS B 1176 |
Locating LoosenessCountermeasure |
Locating LoosenessCountermeasure |
Locating LoosenessCountermeasure |
Standard |
| Material | Steel | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | Steel | Steel | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) |
| Thread Size | M16 | M12 | M16 | M12 | M16 | M8 | M10 | M12 | M3 |
| Length | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
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| Part Name | Hex Socket Head Cap Screws - Full Thread | Hex Socket Head Cap Screws - Full Thread | Hex Socket Head Cap Screws - Full Thread | Hex Socket Head Cap Screws - Full Thread | Hex Socket Head Cap Screws - Full Thread | High Strength Stainless Steel Socket Head Cap Screws | High Strength Stainless Steel Socket Head Cap Screws | High Strength Stainless Steel Socket Head Cap Screws | Hex Socket Head Cap Screws - Titanium |
| Part Number | SNSS-M4-45-FT | SNSS-M5-45-FT | SNSS-M6-45-FT | SNSS-M8-45-FT | SNSS-M10-45-FT | SNSLG-M4-45 | SNSLG-M5-45 | SNSLG-M6-45 | SNST-M6-45 |
| Feature | Standard | Standard | Standard | Standard | Standard | High Strength (Strength Class 10.8 Equivalent) Heat Resistance Corrosion Resistance Nonmagnetic |
High Strength (Strength Class 10.8 Equivalent) Heat Resistance Corrosion Resistance Nonmagnetic |
High Strength (Strength Class 10.8 Equivalent) Heat Resistance Corrosion Resistance Nonmagnetic |
Lightweight Nonmagnetic Chemical Resistance |
| Material | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) | SUS316L | SUS316L | SUS316L | Grade 2 Titanium |
| Thread Size | M4 | M5 | M6 | M8 | M10 | M4 | M5 | M6 | M6 |
| Length | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
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| Part Name | Hex Socket Head Cap Screws - High Strength Titanium Alloy | Hex Socket Head Cap Screws - High Strength Titanium Alloy | Hex Socket Head Cap Screws - High Strength Titanium Alloy | Hex Socket Head Cap Screws with Captive Washers | Socket Head Cap Screws with Low Profile | Socket Head Cap Screws with Low Profile | Socket Head Cap Screws with Low Profile | Socket Head Cap Screws with Low Profile | Socket Head Cap Screws with Low Profile |
| Part Number | SNSTG-M6-45 | SNSTG-M8-45 | SNSTG-M10-45 | SNSQS-M6-45 | SLH-M6-45 | SLH-M8-45 | SLH-M10-45 | SLHS-M6-45 | SLHS-M8-45 |
| Feature | High Strength Lightweight Nonmagnetic Corrosion Resistance |
High Strength Lightweight Nonmagnetic Corrosion Resistance |
High Strength Lightweight Nonmagnetic Corrosion Resistance |
Captive Washers I=3 |
Space-Saving Low Profile Conforms to DIN 7984. |
Space-Saving Low Profile Conforms to DIN 7984. |
Space-Saving Low Profile Conforms to DIN 7984. |
Space-saving Low Profile |
Space-saving Low Profile |
| Material | Grade 5 Titanium | Grade 5 Titanium | Grade 5 Titanium | SUSXM7 (Equivalent to SUS304) | Steel | Steel | Steel | SUSXM7 (Equivalent to SUS304) | SUSXM7 (Equivalent to SUS304) |
| Thread Size | M6 | M8 | M10 | M6 | M6 | M8 | M10 | M6 | M8 |
| Length | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Operating Temperature (℃) | - | - | - | - | - | - | - | - | - |
| CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD | CAD |
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
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| Part Name | Flanged Socket Head Cap Screws | Socket Button Head Cap Screws | Socket Button Head Cap Screws | Socket Button Head Cap Screws | Hexagon Socket Countersunk Head Screws | ||||
| Part Number | SFS-M12-45 | SNB-M8-45 | SNB-M10-45 | SNBS-M8-45 | SNFCS-M8-45 | ||||
| Feature | Flanged | Socket Button Head Cap Screws | Socket Button Head Cap Screws | Socket Button Head Cap Screws | Hexagon Socket Countersunk Head Screws | ||||
| Material | Steel | Steel | Steel | Stainless Steel | Stainless Steel | ||||
| Thread Size | M12 | M8 | M10 | M8 | M8 | ||||
| Length | 45 | 45 | 45 | 45 | 45 | ||||
| Operating Temperature (℃) | - | - | - | - | - | ||||
| CAD | CAD | CAD | CAD | CAD | CAD | ||||
| Specifications | Specifications | Specifications | Specifications | Specifications | Specifications |
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