Industrial Square Head Bolts
Product: square head bolts for industrial, construction, and mechanical fastening
Standard: ASME B18.2.1, DIN 558, ISO 4017 (customizable to regional standards)
Raw Material: Carbon steel (A36, 1035, 1045), alloy steel (40Cr, 35CrMo), stainless steel (304, 316)
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Product Introduction
Product: square head bolts for industrial, construction, and mechanical fastening
Standard: ASME B18.2.1, DIN 558, ISO 4017 (customizable to regional standards)
Raw Material: Carbon steel (A36, 1035, 1045), alloy steel (40Cr, 35CrMo), stainless steel (304, 316)
Surface Treatments: Plain, black oxide, zinc plated (clear/blue/yellow), hot-dip galvanizing (H.D.G), Dacromet, phosphated
Specification Range: Metric: M6–M48; INCH: 1/4"–1 3/4" (full thread or partial thread options)
Property Class: 4.8, 5.8, 8.8, 10.9 (carbon/alloy steel); A2/A4 (stainless steel)
Mechanical Properties
|
Characteristic |
4.8 Class |
8.8 Class |
10.9 Class |
Stainless Steel (304) |
|
Minimum Tensile Strength |
420 MPa |
800 MPa |
1040 MPa |
515 MPa |
|
Minimum Yield Strength |
330 MPa |
640 MPa |
830 MPa |
205 MPa |
|
Hardness Range |
≤20 HRC |
22–32 HRC |
32–39 HRC |
- |
|
Corrosion Resistance |
Basic |
Moderate (with plating) |
Moderate (with plating) |
Excellent |
Key Featuresoose us
Classic Square Head Design:
Provides enhanced wrench grip and torque transmission, ideal for manual installation in tight spaces or applications requiring frequent adjustments.
Versatile Material Options:
Carbon/alloy steel variants offer high strength for heavy-loads; stainless steel options deliver excellent corrosion resistance for harsh environments.
Reliable Fastening:
Precision-threaded (rolled or cut threads) for secure engagement with nuts, ensuring stability under vibration and static loads.
Wide Compatibility:
Works with standard nuts, washers, and tools; suitable for both new installations and replacement of legacy equipment.
Application Fields
Suitable for diverse industrial, construction, and mechanical scenarios:
Heavy machinery, agricultural equipment, and industrial fixtures
01
Construction framing, wooden structures, and concrete anchoring
02
Plumbing, piping systems, and valve assemblies
03
Legacy equipment maintenance and replacement
04
Outdoor structures (with anti-corrosion treatments) and general-purpose fastening
05
Usage Precautions
Installation: Use open-end, box-end, or adjustable wrenches for tightening; avoid over-tightening to prevent thread damage or bolt breakage.
Environment: Select H.D.G, Dacromet, or stainless steel for outdoor/humid/corrosive settings; plain or black oxide is suitable for indoor dry environments.
Compatibility: Pair with matching nuts (same thread size/grade) and washers to distribute load and protect workpiece surfaces.
Maintenance: Inspect periodically for loosening or corrosion; retighten or replace as needed.
Taboos: Do not use for high-vibration or ultra-high-load critical structures without anti-loosening measures; avoid mixing materials/grades.
Markets & Logistics
- Main Markets: Global industrial, construction, and maintenance sectors (North America, Europe, Asia-Pacific, Middle East)
- Packaging: Small bags, cartons, pallets, or steel drums; customized packaging and labeling available for bulk orders.
- Order Flexibility: Supports standard and custom specifications (length, thread type, surface treatment); negotiable delivery terms.
Quality Assurance
Certifications:
ISO9001:2015; compliant with ASME, DIN, and ISO standards.
Batch testing:
Tensile strength, yield strength, thread precision, and corrosion resistance verification.
Long-term quality guarantee and technical support for installation and application.
How to Choose Between Square Head Bolts and Hex Head Bolts
The selection depends on application scenarios, installation conditions, and performance requirements:
- Square Head Bolts
Ideal for: Manual installation in tight spaces (enhanced wrench grip), frequent adjustments, legacy equipment replacement, or scenarios like wooden structures/construction framing.
Key strengths: Superior torque transmission, stable grip with basic wrenches (open-end/adjustable), and compatibility with older systems.
Limitation: Less common in high-precision or automated assembly; bulkier than hex heads.
- Hex Head Bolts
Ideal for: General industrial/mechanical fastening, automated assembly (compatible with socket wrenches), high-load applications, or standard equipment.
Key strengths: Wide availability, efficient tightening (manual/automated), better stress distribution, and suitability for high-strength grades (e.g., 12.9 class).
Limitation: May slip in narrow spaces without proper socket access.
Established in 2005, our company has evolved over two decades of continuous development into a leading regional enterprise in the fastener industry with fully automated end-to-end production. With an annual output value exceeding RMB 130 million, our product range covers diverse market segments from mid-range to high-end and is distributed worldwide
Our factory & quipment
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