Premium 1 4 20x1 2 Hex Head Bolt: High-Strength Fastening Solutions

Product Overview

In the world of industrial fasteners, precision and reliability are non-negotiable. The 1 4 20x1 2 hex head bolt represents a critical component in countless assembly lines, construction projects, and heavy machinery applications. This specific bolt, characterized by its 1/4-inch diameter, 20 threads per inch (UNC), and 1-1/2 inch length, offers the perfect balance of holding power and dimensional compatibility for medium-duty fastening tasks.

Manufactured to strict ASTM standards, our 1 4 20x1 2 hex head bolt is engineered for applications where a standard hex head provides optimal torque transfer. Whether you are securing brackets in HVAC systems or assembling automotive components, this bolt delivers consistent clamping force without thread stripping or head shearing.

Key Features

• Precision UNC Threads: Class 2A external threads ensure smooth engagement with standard 1/4-20 nuts and tapped holes, reducing assembly time.
• Full Hex Head Design: Standard 7/16-inch hex head width accommodates common wrenches and sockets, allowing for high torque application without cam-out.
• Corrosion Resistance Options: Available in plain steel, zinc-plated (yellow or clear), hot-dip galvanized, and 304/316 stainless steel for diverse environmental conditions.
• Consistent Dimensional Accuracy: Head height, thread length, and body diameter held to ±0.005 inches for seamless integration with pre-drilled holes.
• Grade 5/8 Strength: Medium carbon steel heat-treated to 120,000-150,000 PSI tensile strength, suitable for most structural and mechanical applications.

Technical Specifications

Application Scenarios

The 1 4 20x1 2 hex head bolt serves a wide range of industries where moderate clamping force and standard thread engagement are required. Common applications include:

• Automotive Assembly: Securing engine brackets, transmission mounts, and body panels where 1/4-inch hardware is specified.
• HVAC & Sheet Metal: Fastening ductwork supports, compressor brackets, and unit bases to structural steel.
• General Construction: Attaching light steel framing, handrails, and equipment anchors to concrete anchors or wood.
• Agriculture Equipment: Holding guards, shields, and linkage components on tractors and implements.
• Furniture Manufacturing: Assembling heavy-duty office furniture, workbenches, and storage racks.
• Marine & Outdoor: Stainless steel versions used for dock hardware, boat fittings, and solar panel mounts.

Advantages

• Superior Clamp Load: The 20 TPI fine thread (for its diameter) provides excellent vibration resistance compared to coarser threads, reducing loosening in dynamic environments.
• Standard Tooling: Uses common 1/2-inch or 9/16-inch sockets, minimizing specialized tool requirements on job sites.
• Cost-Effective: As a standard UNC size, the 1 4 20x1 2 hex head bolt is mass-produced, offering competitive pricing without compromising quality.
• Versatile Length: The 1.5-inch length allows for fastening through materials up to 1 inch thick with adequate thread engagement.
• Easy Inspection: Hex head design permits visual torque verification and easy removal for maintenance.

Why Choose Us

As a dedicated supplier of industrial fasteners, we specialize in the 1 4 20x1 2 hex head bolt and thousands of related SKUs. Our competitive advantages include:

• ISO 9001:2015 Certified Manufacturing: Every batch undergoes dimensional, hardness, and tensile testing with full traceability.
• Global Logistics: Warehouses in North America, Europe, and Asia ensure 3-5 day delivery to major industrial hubs.
• Custom Solutions: We offer special lengths (1.25 to 4 inches), non-standard finishes (Xylan, PTFE), and mixed-material kits per your BOM.
• Technical Support: Our engineering team provides torque specifications, material selection advice, and failure analysis.
• Bulk Discounts: Tiered pricing for orders above 5,000 pieces; OEM partnerships available for annual contracts.

FAQ

Q1: What is the torque specification for a 1/4-20 hex head bolt?

For a Grade 5 1 4 20x1 2 hex head bolt, the recommended tightening torque is 8-10 ft-lbs (dry) or 6-8 ft-lbs (lubricated). For Grade 8, increase to 12-14 ft-lbs. Always verify with a torque wrench in critical applications.

Q2: Can I use this bolt in outdoor or corrosive environments?

Yes, but choose the appropriate finish: zinc-plated for mild indoor moisture, hot-dip galvanized for heavy outdoor exposure, or 316 stainless steel for marine and chemical environments. Plain steel is not recommended for outdoor use.

Q3: What is the difference between full thread and partial thread?

Full thread means the threads run the entire 1.5-inch length. Partial thread (typically 1 inch of thread with 0.5 inch of plain shank) is used when the bolt passes through a clearance hole and threads into a tapped hole, preventing thread interference with the clamped material.

Q4: Does this bolt require a washer?

We recommend a flat washer under the hex head to distribute load and prevent surface marring. A lock washer (split or star) is advisable in high-vibration applications to prevent loosening.

Q5: What is the minimum order quantity (MOQ)?

For standard plain steel 1 4 20x1 2 hex head bolt, MOQ is 100 pieces. For plated or stainless steel, MOQ is 500 pieces. Custom lengths or finishes may require 1,000 pieces. Contact our sales team for specific requirements.

Q6: How do I verify the bolt grade?

Grade 5 bolts have three radial hash marks on the head. Grade 8 bolts have six hash marks. Stainless steel bolts are typically marked with "304" or "316" and may have no hash marks. Unmarked bolts are usually Grade 2 or low carbon steel.

For technical drawings, material certificates, or custom quotations, please contact our engineering department at [email protected] or request a quote through our website.