The hexagon socket large flat head screw is a fastener with a
hexagon socket hole design on the head and a flat or flat top. It
needs to be used with a hexagon socket wrench.
1. Features
Hexagon socket hole design: The head needs to be operated with a
hexagon socket wrench of the corresponding specification. It is not
easy to slip during installation and is suitable for scenes with
limited space.
Flat head structure: The ultra-thin flat head design makes it
flush with the contact surface after installation, and the
appearance is neat and beautiful, especially suitable for occasions
with high requirements for surface flatness.
High-strength material: Common materials include 304/410 stainless
steel (corrosion-resistant) and carbon steel (strong economy). Some
products can reach 12.9 grade high strength, suitable for high-load
environments.
2. Standards and specifications
National standard: GB/T 70.2: Covers the size and technical
requirements of hexagon socket flat round head screws, suitable for
general mechanical connections.
GB/T 70.4: Specifies hexagon socket flat round head screws with
flanges (washers) to enhance preload. International standards:
ISO 7380 series: Includes flat round head and washer models,
suitable for international general equipment. JIS B 1174:
Japanese industrial standard, including a washer design version.
Model example: For example, YJT 4026 is a typical large flat
head screw model that meets the high strength requirements of
multiple scenarios.
3. Application scenarios
Furniture assembly: Used to connect wooden or metal parts, taking
into account both stability and aesthetics, such as cabinets and
baby cribs.
Machinery manufacturing: Suitable for connecting parts of machine
tools, automobiles and other equipment, and the 12.9 grade
high-strength model can withstand extreme pressure.
Construction engineering: Used for the installation of outdoor
facilities such as steel structures and billboards, and the
stainless steel material has excellent weather resistance.
IV. Purchase suggestions
1. Material selection: 304/316 stainless steel (rust-proof) is
preferred for humid environments; carbon steel or galvanized
materials (cost-effective) are optional for conventional
environments.
2. Strength matching: 12.9 grade is suitable for heavy-duty
machinery; 8.8 grade meets general industrial needs.
3. Specification parameters: The thread length needs to be selected
according to the thickness of the connector (such as M5×20 means
diameter 5mm, length 20mm)
