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Some Statistics About Us You Must Know
Choose the plan that suits you best.
19
+
YEARS OF EXPERIENCE
3000㎡+
FLOOR SPACE
160
+
MACHINERY EQUIPMENT
3500
+
SATISFIED CUSTOMERS
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Product Picture
Black Square Head Bolt
-Material：Steel 1018, steel 10B21, SCM435 steel
-Surface finish: Zinc plated, Zinc nickel plated, black oxide, Decromet
-Thread metric:M2,M3,M4,M5,M6,M8,M12
-Thread imperial:0-80,2-56,3-48,3-56,4-40,4-48,5-40,5-44,6-32,6-40,8-32,8-36,10-24,10-32,1/4-20,5/16-18
-Head Shape:square head
-Hardness:23-35HRC
-Grade: 8.8, 10.9,12.9
Black Square Head Bolt Application:
Machinery Manufacturing
Square head bolts are often used for connecting rough-structured mechanical parts where high precision is not required, such as in machine tools and construction machinery. The square head allows the wrench to grip firmly, effectively preventing loosening under vibration or impact. They are suitable for parts that require frequent disassembly and adjustment.
Construction Industry
In steel structures, bridges, and similar projects, square head bolts can be used to connect steel components. They are especially suitable for applications where position adjustment in T-slots is required, such as railway sleeper fastening and curtain wall installation.
Railway Transportation
Square head bolts are used for securing and connecting railway tracks, such as spikes and sleeper bolts. Their anti-rotation function ensures the stability of tracks during long-term operation.
Maintenance of Old Equipment
For older equipment or structures, square head bolts are suitable due to their coarse manufacturing characteristics, which allow them to adapt to irregular installation environments, making them convenient for repair and modification.
Notes
Square head bolts are generally considered coarse-thread fasteners with relatively low precision, and are not suitable for applications requiring high accuracy. When in use, it is important to select the appropriate size and material, and ensure that the installation position meets design requirements.
Quality Control
Quality Control Process:
Vernier Caliper/Micrometer
Used to measure the outer diameter, length, thickness, and other dimensions of screws, nuts, and other parts.
Torque Meter
Checks whether the torque applied during tightening meets standards, ensuring safe and reliable use.
Depth Micrometer
Used to measure internal dimensions such as hole depth and groove depth to ensure precise assembly.
Plug Gauge
Checks the dimensions of threaded holes or fastener bores to ensure insertion and a tight fit.
Thread Gauge
Used to check thread accuracy to prevent problems such as stripping and sticking.
Ring Gauge
Tests the external thread dimensions of screws to ensure a proper fit with nuts.
Hardness Tester
Measures the hardness of fastener materials to determine whether they meet applicable standards.
Projector
Magnifies the outline of a product to check for any deviations or minor defects.
Salt Spray Tester
Simulates product use in humid or corrosive environments to test its rust and corrosion resistance.
FAQ
Q: Are you a factory or a trader?
A: We are a leading fastener manufacturer with 19 years of experience in R&D and production.
Q: Where is your factory located?
A: It's located in Huizhou, Guangdong.
Q: Can Black Square Head Bolts be customized?
A: Yes. We support OEM/ODM customization. We can customize specifications to meet customer needs.
Q: What materials are available for bolts?
A: Carbon steel, alloy steel, stainless steel, copper, brass, etc.
Q: What is the minimum order quantity for fasteners?
A: The minimum order quantity is flexible and controllable. Please contact us for details.
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