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Author: Site Editor Publish Time: 2025-10-31 Origin: Site
The stainless steel hex socket bolt, also known as an Allen bolt or socket head bolt, is one of the most reliable and durable fasteners used across industrial, mechanical, and solar applications.
Its unique hexagonal socket design allows for superior torque transfer and precise tightening, making it a preferred choice for engineers and installers worldwide.
A hex socket bolt is a type of bolt fastener featuring a cylindrical head with an internal hexagonal drive.
It is tightened using an Allen wrench (hex key) instead of a traditional wrench, which provides better control and prevents damage to surrounding components.
These stainless steel bolts are commonly used in:
Solar mounting systems
Machinery and equipment assembly
Automotive components
Metal structures and construction
| Parameter | Description |
|---|---|
| Product Name | Stainless Steel Hex Socket Bolt |
| Head Type | Hex socket / Allen head |
| Thread Type | Full or partial thread |
| Material | Stainless Steel 304, 316, or 316L |
| Diameter Range | M4 – M24 |
| Length Range | 10mm – 200mm |
| Surface Finish | Polished, Passivated |
| Strength Grade | A2-70, A4-80 |
| Standard | DIN 912, ISO 4762, ANSI B18.3 |
Made from stainless steel, these hex socket bolts resist rust and corrosion, making them ideal for outdoor and marine environments.
The A2-70 and A4-80 grades provide excellent mechanical strength, ensuring a secure connection even under high stress or vibration.
The socket head allows installation in tight or recessed spaces where regular hex bolts cannot fit.
The internal hex drive ensures easy tightening or removal without stripping the bolt head, extending its lifespan.
| Application | Purpose |
|---|---|
| Solar Mounting Systems | Fastening rails, brackets, and solar accessories |
| Machinery Assembly | Precision fitting and vibration resistance |
| Construction and Steel Structures | Securing frames and supports |
| Automotive Components | Engine parts, brake systems, and suspension |
| Electronics and Robotics | Clean finish and precise torque control |
These stainless steel fasteners are versatile, combining strength, appearance, and durability for long-term use in harsh environments.
| Feature | Benefit |
|---|---|
| Material Quality | Made of SUS304 or SUS316 for superior corrosion protection |
| Aesthetic Finish | Smooth surface suitable for visible structures |
| High Torque Capability | Prevents loosening under dynamic load |
| Reusable Design | Can be reused multiple times without deformation |
| Compatible with Nuts and Washers | Works perfectly with stainless steel nuts, washers, and spring washers |
| Grade | Composition | Properties | Application |
|---|---|---|---|
| A2-70 (SS304) | 18% Cr, 8% Ni | General corrosion resistance | Indoor, mild outdoor use |
| A4-80 (SS316) | 16% Cr, 10% Ni, 2% Mo | Excellent marine and chemical resistance | Outdoor, marine, solar |
| 316L | Low carbon stainless steel | Better welding performance | Chemical or food industries |
When it comes to solar fasteners, A4-80 stainless steel bolts are the best choice for durability and environmental protection.
Select the correct bolt size (e.g., M6, M8, or M10).
Align the components (e.g., bracket, rail, or base).
Insert the bolt through the hole and thread it into the nut or tapped hole.
Use a hex key or Allen wrench to tighten the bolt gradually.
Ensure correct torque to avoid over-tightening or thread damage.
Tip: Use spring washers or locking nuts with your bolts to prevent loosening under vibration.
In solar mounting systems, hex socket bolts serve as reliable solar fasteners that connect key parts such as rails, brackets, and grounding lugs.
Their stainless steel construction ensures resistance to UV exposure, humidity, and temperature changes.
Enhanced mechanical strength
Precise assembly and alignment
Resistance to corrosion in coastal or humid areas
Compatibility with solar accessories and bracket systems
| Feature | Hex Socket Bolt | Hex Head Bolt |
|---|---|---|
| Head Design | Internal hex drive | External hex drive |
| Installation Space | Compact, ideal for tight spaces | Requires open space |
| Tool Required | Allen key | Spanner or wrench |
| Appearance | Smooth and aesthetic | Industrial look |
| Common Use | Machinery, solar structures | Construction, steel assembly |
Use the correct hex key size to avoid stripping.
Apply anti-seize compound for high-temperature or marine installations.
Regularly inspect for corrosion in exposed environments.
Pair with matching stainless steel nuts to avoid galvanic corrosion.
The stainless steel hex socket bolt is a versatile and high-performance fastener that combines strength, precision, and corrosion resistance.
Whether used in solar mounting systems, machinery, or construction, it ensures a long-lasting and reliable connection.
By choosing the right bolt material, grade, and size, you can guarantee both structural integrity and long-term durability in any application.
1. What is a hex socket bolt used for?
It is used to securely fasten components in machinery, construction, and solar systems where high torque and precise fitting are required.
2. What material is best for hex socket bolts?
Stainless steel 304 or 316 provides excellent corrosion resistance and strength.
3. What tools are used for tightening hex socket bolts?
An Allen wrench (hex key) or socket driver is used to tighten or remove the bolt.
4. Are stainless steel hex socket bolts rust-proof?
Yes, they are highly resistant to rust and oxidation, especially when made from A4-80 (SS316) material.
5. Can hex socket bolts be reused?
Yes, as long as the threads and head remain undamaged, they can be reused multiple times.
