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Home > Products > Metal Bolt > M2 M8 M12 A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel Metal Bolt Flat Square Head Bolt GB /T 8

M2 M8 M12 A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel Metal Bolt Flat Square Head Bolt GB /T 8

Product Details

Place of Origin: China

Brand Name: JIASHAN

Certification: ISO9001:2008,SGS,RoHS

Model Number: customized

Payment & Shipping Terms

Minimum Order Quantity: 10 pcs

Price: 0.01~0.11 USD

Packaging Details: *Packing:Plastic Bag+Chipboard Carton+Plywood Pallet Pallet with Belt&Plastic Film.

Delivery Time: 5-15 work days

Payment Terms: L/C, D/A, D/P, T/T, Western Union

Supply Ability: 10000 PCS

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Highlight:

M12 stainless steel bolt

,

A4-80 metal square head bolt

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M8 flat head bolt

Used:
Building Industry Machinery
Function:
Connection,Fastening And Decoration
Package Quantity:
100 Pieces
Application:
Construction, Automotive, Machinery
Payment Term:
L/C,T/T,Westerin Union
Strength:
High
Usage:
Mechanical Fastening
Sample:
Available
Productname:
Metal Bolt
Material:
Stainless Steel
Compatibility:
Universal
Used:
Building Industry Machinery
Function:
Connection,Fastening And Decoration
Package Quantity:
100 Pieces
Application:
Construction, Automotive, Machinery
Payment Term:
L/C,T/T,Westerin Union
Strength:
High
Usage:
Mechanical Fastening
Sample:
Available
Productname:
Metal Bolt
Material:
Stainless Steel
Compatibility:
Universal
M2 M8 M12 A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel Metal Bolt Flat Square Head Bolt GB /T 8
M2 M8 M12 A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel Metal Bolt Flat Square Head Bolt GB /T 8
M2 M8 M12 A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel  Metal Bolt Flat Square Head Bolt  GB /T 8 0
Product Specifications
Name Metal Bolt
Standard DIN, ASME, ANSI, ISO
Material Stainless steel
Place of Origin China
Finish Polish, Passivation, Black, Galvanization, Chromate, Dacromet
Certificate ISO9001:2008, ROHS
Used Building Industry Machinery
Thread Type Coarse, Fine
Usage Fastening
Function Connection, Fastening and Decoration
Strength High
Size Various sizes available
Measurement System INCH, Metric system
Product Description

Square head bolts, alternatively called square head screws ‌, are essential fasteners known for their robustness and versatility. The square shape of the head provides a unique advantage in terms of torque application. It distributes the force evenly, reducing the risk of rounding off during tightening. These bolts are available in a wide range of materials, with stainless steel variants being highly popular due to their durability and resistance to rust. The different size options, from small M2 to larger M16, and the availability of customized pieces, make them adaptable to various projects. In the field of metalworking, construction, and even in some household repairs, square head bolts play a crucial role in holding structures and components together firmly.

Applications
  • Industrial Machinery Assembly: Used to connect heavy-duty components (e.g., gearboxes, engine blocks) in manufacturing equipment, ensuring stable load distribution during operation.
  • Construction Engineering: Secures structural elements like steel beams, columns, and prefabricated panels in buildings, bridges, and infrastructure projects.
  • Automotive & Aerospace: Joins critical parts (e.g., chassis frames, engine mounts, aircraft fuselage sections) where high strength and vibration resistance are required.
  • Power Generation Equipment: Fixes turbine components, generator casings, and transmission systems in thermal, hydro, or wind power plants.
  • Heavy-Duty Furniture & Fixtures: Assembles robust furniture (e.g., industrial workbenches, storage racks) and fixtures (e.g., machine tool bases) needing durable, long-term connections.
Material Specifications
Aluminum Excellent thermal/electrical conductivity but naturally soft. May produce gelatinous buildup during processing.
Titanium EDM machining recommended. Requires deionized water to control heat during processing.
Steel Very strong metal. Wire cutting machines often preferred for complex features. Requires heat management.
Brass High tensile strength, easy to machine but requires slow cutting speed due to softness.
Features & Advantages
  • Medium carbon steel construction: Offers balanced strength (typically 4.8–12.9 grade) and toughness, suitable for moderate to high-load applications.
  • Reusable & cost-effective: Can be removed and reinstalled multiple times without significant loss of performance, reducing long-term maintenance costs.
  • Gasket-free compatibility: Directly interfaces with mating surfaces or nuts, eliminating the need for additional gaskets while maintaining sealing integrity.
  • High-strength bolt compatibility: Works seamlessly with Class 8.8 and 10.9 high-strength bolts, enhancing overall joint reliability under dynamic or static loads.
  • Durable wholeness: Manufactured with precision threading and surface treatments (e.g., zinc plating, black oxide) for corrosion resistance and extended service life.
Product Images
Frequently Asked Questions
Q: Are you trading company or manufacturer?

A: We are factory and OEM are available.

Q: How long is your delivery time?

A: Generally 7-10 days if in stock, or 15-20 days if not in stock (depending on quantity).

Q: Do you provide samples? Is it free or extra?

A: Yes, we offer free samples but customer pays freight cost.

Q: What are your payment terms?

A: 30% T/T in advance, balance before shipment or L/C.