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 designed for industrial, construction, and mechanical fastening applications.
Standards: Manufactured in accordance with ASME B18.2.1, DIN 558, and ISO 4017; customizable to meet various regional standards.
Materials: Carbon steel (A36, 1035, 1045), alloy steel (40Cr, 35CrMo), and stainless steel (304, 316).
Surface Finishes: Plain, black oxide, zinc plating (clear, blue, yellow), hot-dip galvanizing (HDG), Dacromet, and phosphating.
Specifications: Metric sizes from M6 to M48; inch sizes from 1/4" to 1-3/4", with both full thread and partial thread available.
Property Classes: 4.8, 5.8, 8.8, 10.9 for carbon and alloy steel; A2 and A4 for stainless steel.
parameter
Core Features
Classic Square Head Design
Offers improved wrench grip and efficient torque transfer, perfect for manual installation in confined areas or frequent adjustment tasks.
Versatile Material Options
Carbon and alloy steel models provide exceptional strength for heavy-duty applications, while stainless steel versions offer superior corrosion resistance in harsh environments.
Reliable Fastening
Features precision-rolled or precision-cut threads for secure nut engagement, guaranteeing stability under both vibration and static loads.
Wide Compatibility
Compatible with standard nuts, washers and common tools; ideal for new installations as well as retrofitting or replacing existing equipment.
Application Fields
Suitable for diverse industrial, construction, and mechanical scenarios
Heavy‑duty machinery, agricultural machinery, and industrial fixed installations
01
Building framing, timber structures, and concrete anchoring applications
02
Plumbing installations, pipeline systems, and valve components
03
Maintenance and replacement of existing and legacy equipment
04
Outdoor structures with corrosion-resistant treatments and general-purpose fastening applications
05
Usage Precautions
Installation: Tighten using open-end, box-end, or adjustable wrenches. Do not over-tighten, as this may cause thread damage or bolt fracture.
Environment:For outdoor, humid, or corrosive environments, choose hot-dip galvanized (HDG), Dacromet, or stainless steel versions. For indoor dry environments, plain or black oxide finishes are recommended.
Compatibility: Use with matched nuts of identical thread size and grade, along with appropriate washers, to evenly distribute loads and safeguard workpiece surfaces.
Maintenance:Regularly inspect for loosening or corrosion. Retighten or replace components as necessary.
Taboos: Not recommended for critical high-vibration or ultra-high-load applications without additional anti-loosening measures. Avoid mixing different materials or grades.
Markets & Logistics
- Main Markets: Global industrial, construction, and maintenance sectors (North America, Europe, Asia-Pacific, Middle East)
- Packaging: includes small plastic bags, cardboard boxes, cartons, wooden pallets and steel drums. Custom packaging solutions-such as specification-labeled packaging or moisture-proof packaging for outdoor-use bolts-are available upon request.
- Order Flexibility: Supports standard and custom specifications (length, thread type, surface treatment); negotiable delivery terms.
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
FAQ
Q: 1,What materials and surface treatments are available for square head bolts?
A: We use carbon steel (A36, 1035, 1045), alloy steel (40Cr, 35CrMo), and stainless steel (304, 316). Surface treatments include plain, black oxide, zinc plating, hot-dip galvanizing (HDG), Dacromet, and phosphating.
Q: 2,What are the main advantages of square head bolts over hex head bolts?
A: Square head bolts offer better wrench grip and torque transmission, making them perfect for manual installation in tight spaces and frequent adjustments. They also fit legacy equipment well and work reliably with common open-end or adjustable wrenches.
Q: 3,What specifications and strength grades do you provide?
A: Metric sizes range from M6 to M48, and inch sizes from 1/4" to 1 3/4", with full or partial thread options. Strength grades include 4.8, 5.8, 8.8, 10.9 for carbon/alloy steel, and A2/A4 for stainless steel.
Q: 4,What should I note for installation and maintenance of square head bolts?
A: Use standard wrenches and avoid over-tightening to protect threads. Choose corrosion-resistant coatings for outdoor use, match nuts and washers properly, inspect regularly for loosening or corrosion, and do not use in high-vibration critical applications without anti-loosening measures.
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