1. Product Overview

Our 1/4"-20 x 1-1/2" hex bolt is a precision-engineered, heavy-duty fastener designed for reliability in demanding industrial environments. This specific bolt features a 1/4-inch nominal diameter with a coarse 20 threads-per-inch (TPI) thread pitch and a 1.5-inch shank length, making it a versatile and commonly requested component in machinery assembly, structural frameworks, and equipment manufacturing. Manufactured from high-grade materials and subjected to rigorous quality control, this hex head cap screw provides exceptional tensile strength and shear resistance, ensuring secure, long-lasting connections that withstand vibration, dynamic loads, and harsh operating conditions. It is an indispensable component for OEMs, MRO operations, and construction projects requiring standardized, high-performance fastening.

2. Key Features

• Standardized Dimensions: Conforms to ANSI/ASME B18.2.1 standards, ensuring compatibility and interchangeability with existing systems and components.
• High-Strength Material: Typically available in Grade 5 (medium carbon steel, quenched and tempered) or Grade 8 (alloy steel, quenched and tempered) for superior mechanical properties.
• Hex Head Design: The six-sided head allows for high torque application with common wrenches and sockets, facilitating easy installation and removal even in tight spaces.
• Coarse Thread Pitch (20 TPI): Offers faster assembly, better resistance to stripping in softer materials, and is less prone to cross-threading compared to fine threads.
• Full Thread or Partial Thread Options: Available with threads extending the full length of the shank or with an unthreaded shoulder for precise clamping applications.
• Durable Finishes: Offered in various finishes such as plain, zinc-plated, hot-dip galvanized, or black oxide to provide corrosion resistance suited to different environmental conditions.

3. Technical Specifications

4. Application Scenarios

The 1/4"-20 x 1-1/2" hex bolt is a workhorse fastener utilized across a broad spectrum of industries. Its balanced size and strength make it ideal for:

• Machinery & Equipment Manufacturing: Assembly of frames, guards, panels, and components in agricultural, packaging, and material handling equipment.
• Automotive & Transportation: Securing brackets, engine components, and structural parts in vehicles and trailers.
• Metal Fabrication & Construction: Connecting structural steel members, securing HVAC ducting, and fastening in light structural applications.
• Industrial Maintenance, Repair, and Operations (MRO): A critical spare part for repairing machinery, conveyor systems, and plant infrastructure.
• Electronics & Enclosure Assembly: Mounting heavy components inside racks, server cabinets, and industrial control panels.

5. Advantages

Choosing our hex bolts provides tangible benefits for your production line and project outcomes:

• Enhanced Joint Integrity: Precision-formed threads and consistent heat treatment ensure uniform clamping force and prevent premature failure.
• Streamlined Procurement: As a standard 1 4 20x1 2 hex bolt, it simplifies inventory management and reduces the need for custom fasteners.
• Improved Assembly Efficiency: The hex head design allows for rapid installation with common tools, reducing labor time and cost.
• Cost-Effectiveness: High-volume manufacturing of this standard size offers excellent value without compromising on quality or performance.
• Versatility: Available in multiple grades and finishes, it can be specified for applications ranging from general-purpose to high-stress and corrosive environments.

6. Why Choose Us

As your strategic fastener partner, we distinguish ourselves through commitment to quality and service:

• Certified Quality Assurance: Every batch is tested for compliance with international standards (ISO, ASTM, ASME), with Mill Test Certificates available.
• Extensive Inventory: We maintain large stockpiles of the 1/4"-20 x 1-1/2" hex bolt in various grades and finishes, ready for immediate shipment to keep your projects on schedule.
• Technical Expertise: Our team provides expert guidance on fastener selection, helping you choose the optimal bolt for your specific load, material, and environmental requirements.
• Global Logistics Network: We ensure reliable, on-time delivery to manufacturing hubs worldwide, supported by efficient export documentation.
• B2B Focus: We offer competitive bulk pricing, customized packaging, and consistent supply tailored to the needs of industrial buyers and distributors.

7. FAQ

Q1: What is the difference between a Grade 5 and Grade 8 1/4"-20 x 1-1/2" hex bolt?

A: Grade 5 bolts are made from medium carbon steel and have a minimum tensile strength of 120,000 psi. Grade 8 bolts are made from medium carbon alloy steel and have a minimum tensile strength of 150,000 psi, offering greater strength and fatigue resistance for more critical applications. The choice depends on the required clamp load and safety factor.

Q2: Is this bolt suitable for outdoor or corrosive environments?

A: The base material (steel) is susceptible to corrosion. For outdoor use, we recommend specifying a finish such as hot-dip galvanizing (HDG) or zinc plating with a yellow chromate conversion coating, which significantly enhances corrosion resistance.

Q3: Do you offer this bolt in stainless steel?

A: Yes. While the standard offering is carbon or alloy steel, we can supply this size in Stainless Steel 304 or 316 for superior corrosion resistance in chemical, marine, or food-grade applications. Please inquire for availability and pricing.

Q4: How is the length of a 1 4 20x1 2 hex bolt measured?

A: For a standard hex cap screw, the length is measured from the underside of the head to the very end of the bolt. This is true for both fully and partially threaded versions.

Q5: What is the recommended torque for tightening this bolt?

A: Recommended torque varies based on the bolt grade, finish, and lubrication. As a general guideline, a dry, plain finish Grade 5 bolt might be torqued to approximately 10 ft-lbs, while a Grade 8 might reach 14 ft-lbs. Always consult engineering specifications for critical joints, considering the nut and mating material.