What is the HEXAGON SOCKET HEAD CAP SCREWS ?
Hex Socket Head Cap Screws are fasteners designed with a hexagonal socket in the head, allowing for easy installation and removal using an Allen wrench or hex key. They provide strong clamping force and are commonly used in machinery and equipment assembly, ensuring secure connections.
Hex Socket Head Cap Screws, also known as cap bolts or Allen screws, are fasteners with a cylindrical head featuring a hexagonal socket for tightening. They are designed for high-strength tightening in narrow spaces where traditional wrenches cannot fit. These screws offer advantages such as higher torque and clamping force compared to regular screws, often resulting in fewer screws needed for a given application. Hex Socket Head Cap Screws are widely used in various industries, including equipment manufacturing, machinery, and electronics, particularly in applications where space constraints or aesthetic considerations are important.”
What is the core structural difference between fully threaded and partially threaded hexagon socket head cap screws?
Fully threaded screws have continuous threads from the head to the end, suitable for thin-plate connections or scenarios requiring full-length thread engagement. Partially threaded screws have a smooth, unthreaded shank section between the head and the threaded part, which acts as a guide pin for alignment and reduces thread friction during installation.
What strength grades are commonly used for stainless steel hexagon socket head cap screws (e.g., A2/A4 series)?
“The most common grades are A2-70 and A4-80:
A2-70 (304 stainless steel): Minimum tensile strength ≥ 700 N/mm², suitable for mild corrosive environments.
A4-80 (316 stainless steel): Minimum tensile strength ≥ 800 N/mm², suitable for harsh corrosive environments like coastal or chemical scenarios.”
What is the corresponding inch standard for alloy steel hexagon socket head cap screws, and what are its common grades?
The main inch standard is ASTM A574, and the common strength grades are Grade 2, Grade 5, and Grade 8. Grade 8 is equivalent to metric 12.9-grade in terms of tensile strength.
Why is black oxide treatment often used for hexagon socket head cap screws in machinery instead of zinc plating?
Black oxide treatment forms a thin, uniform oxide film on the screw surface, which improves lubricity and anti-galling performance without increasing the thread size. Zinc plating may cause thread oversize, affecting assembly accuracy in precision machinery. Additionally, black oxide has a better appearance for equipment interiors.
Hangzhou Gmetalparts as a profesional bolt factory in fasteners manufacturing for over 15 years, we main produce and export high strength nuts and bolts as below, if any request for them, feel free to ask us at sales@gmetalparts.com.
- High strength bolts a325
- High strength bolts astm a490
- High strength bolts astm a307
- High tensile strength bolts HDG 8.8, 10.9
- Threaded rods and studs astm a193 B7
- Structural bolts
- Heavy hex nuts A194 2H
- Heavy hex nuts astm A563
- Washers F436″
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Yes. Hangzhou Gmetalparts produce 304 and 316 stainless steel hex bolts that comply with AS 1110.1 – 2000. These bolts are optimized for corrosion resistance. The 316 grade ones are suitable for coastal or chemical – exposed environments in Australia and New Zealand, and their dimensional and thread standards are fully consistent with carbon steel AS/NZS hex bolts.
Hangzhou Gmetalparts has been dedicated to the R&D, manufacturing and trading of Australia-standard structural steel bolts since 2008. As a professional fasteners manufacturer in china , we strictly adhere to core Australian standards including AS/NZS 1252 and AS 1110.1, offering a full range of structural bolt products with strength grades of 8.8 and 10.9, together with matching nuts and washers . Our products fully meet the critical connection requirements of steel structure projects in Australia and New Zealand.
Equipped with advanced stamping and CNC machining equipment, coupled with a comprehensive quality inspection system, we maintain rigorous control over material stability, dimensional accuracy and mechanical properties of our bolts products. These bolts are ideal for heavy-load scenarios such as factory steel trusses and building beam-column joints, while also satisfying the auxiliary connection needs of general steel structures. Thanks to their reliable quality, our products have been exported to overseas markets on a large scale, establishing us as a trusted supplier in the Australia-standard structural steel bolt sector.
To ensure the safety and longevity of of your structures, please feel free to ask us for high strength bolting solutions via sales@gmetalparts.com . Our fasteners experts are always here to support you at our best. Look forward to hear from you.
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