1/4-20 x 1 3/4 Inch Hex Bolt: High-Strength Fastening Solution for Industrial Applications
1. Product Overview
Engineered for reliability and durability, our 1/4-20 x 1 3/4 hex bolt is a cornerstone component in industrial assembly and construction. This specific fastener features a 1/4-inch nominal diameter with a coarse 20-threads-per-inch (TPI) pitch and a 1 3/4-inch shank length, finished with a standard hex head for secure, high-torque installation. Manufactured from premium-grade materials and subjected to rigorous quality control, this hex bolt is designed to deliver exceptional clamping force and shear strength, making it an indispensable part of your procurement list for demanding mechanical and structural applications.
2. Key Features
- Precision Threading: Consistent 1/4-20 UNC coarse threads ensure easy engagement, reduced cross-threading risk, and reliable performance in a wide range of materials.
- Hex Head Design: The six-sided head provides superior grip for wrenches and sockets, allowing for high torque application and secure fastening in tight spaces.
- Optimal Length: The 1 3/4" (1.75-inch) length is a versatile size, suitable for joining materials of moderate thickness where a secure, deep thread engagement is critical.
- Robust Construction: Made from high-tensile steel or other specified alloys, offering excellent resistance to vibration, fatigue, and mechanical stress.
- Corrosion Resistance Options: Available in various finishes, including plain steel, zinc-plated, and hot-dip galvanized, to suit different environmental conditions.
- Full Traceability: Manufactured in compliance with international standards, ensuring consistent quality and performance batch after batch.
3. Technical Specifications
| Specification | Detail |
|---|---|
| Product Name | Hex Cap Screw / Hex Bolt |
| Size Designation | 1/4-20 x 1 3/4 |
| Diameter (Nominal) | 1/4 inch (0.250") |
| Thread Pitch | 20 TPI (UNC Coarse Thread) |
| Length | 1 3/4 inch (1.75") - Measured from under the head. |
| Head Style | Hexagon (Hex) |
| Drive Type | Wrench/Socket (3/8" Hex Width) |
| Common Material | Grade 2, Grade 5, or Grade 8 Steel; Stainless Steel 304/316 |
| Common Finishes | Plain, Zinc Plated (Yellow/Blue Clear Chromate), Hot-Dip Galvanized, Black Oxide |
| Standards | Complies with ASME B18.2.1, ASTM, ANSI, and similar international standards. |
| Proof Load & Tensile Strength | Varies by grade (e.g., Grade 5: 85,000 psi min tensile; Grade 8: 150,000 psi min tensile). |
4. Application Scenarios
The versatility of the 1/4-20 x 1 3/4 hex bolt makes it a preferred choice across numerous sectors. Its balanced size and strength are ideal for applications requiring a secure, semi-permanent, or permanent fastening point.
- Machinery & Equipment Assembly: Used in the fabrication and repair of industrial machinery, agricultural equipment, and conveyor systems.
- Metal Fabrication & Structural Framing: Essential for joining steel brackets, channels, and frames in construction and workshop projects.
- Automotive & Transportation: Suitable for securing components in vehicle frames, trailers, and cargo securing systems.
- Electronics & Enclosure Mounting: Used to assemble server racks, electrical cabinets, and heavy-duty instrumentation housings.
- General Maintenance, Repair, and Operations (MRO): A staple in MRO inventories for facility upkeep, tooling jigs, and fixture construction.
5. Advantages
Choosing our hex bolts translates into tangible benefits for your operations and final product integrity.
- Enhanced Joint Integrity: The hex design allows for precise torque application, creating a vibration-resistant joint that maintains clamp load over time.
- Broad Compatibility: The 1/4-20 thread is one of the most common sizes in North America, ensuring easy pairing with standard nuts, tapped holes, and hardware.
- Durability & Longevity: Select from material and finish combinations that offer optimal resistance to wear, corrosion, and environmental factors, reducing replacement frequency.
- Streamlined Procurement: Consistent quality and availability in bulk quantities help maintain your production schedule and simplify inventory management.
- Cost-Effectiveness: Delivers high performance and reliability at a competitive price point, offering excellent value and reducing total cost of ownership through fewer failures.
6. Why Choose Us as Your Fastener Supplier
We are more than just a distributor; we are a strategic partner in your supply chain. Our focus on the industrial and trade sectors ensures we understand your critical needs for quality, consistency, and reliability.
- Uncompromising Quality Assurance: Every batch of our 1/4-20 x 1 3/4 hex bolts is inspected for dimensional accuracy, thread integrity, and material properties.
- Extensive Inventory: We stock large volumes of this and other key fastener sizes in various grades and finishes, ready for immediate shipment to meet your JIT demands.
- Technical Expertise: Our team provides knowledgeable support to help you select the correct grade, material, and finish for your specific application challenges.
- Global Logistics Network: Efficient, reliable shipping options to support international trade, ensuring your products arrive on time, anywhere in the world.
- B2B Focused Service: Customized packaging, volume pricing, and dedicated account management tailored to the needs of businesses and large-scale projects.
7. Frequently Asked Questions (FAQ)
Q1: What does "1/4-20 x 1 3/4" specifically mean?
A: This is the standard industrial designation. "1/4" refers to the bolt's nominal diameter in inches. "20" indicates there are 20 threads per inch (TPI). "x 1 3/4" specifies the length of the bolt shank, which is 1.75 inches, measured from under the head to the end of the bolt.
Q2: What is the difference between a Grade 5 and Grade 8 version of this bolt?
A: The grade indicates the bolt's strength. A Grade 5 1/4-20 x 1 3/4 hex bolt is a medium-strength bolt suitable for most general applications. A Grade 8 bolt is made from a higher-strength alloy steel, heat-treated to provide significantly greater tensile and yield strength, making it ideal for high-stress, critical applications.
Q3: What finish should I choose for outdoor or corrosive environments?
A: For moderate outdoor exposure, zinc plating with a yellow chromate conversion coating offers good corrosion resistance. For highly corrosive environments (e.g., marine, chemical), we recommend Stainless Steel 316 or a thick Hot-Dip Galvanized finish for maximum protection.
Q4: Can I order this bolt in different materials like stainless steel?
A: Absolutely. While carbon steel is standard, we commonly supply this size in Stainless Steel 304 (general corrosion resistance) and Stainless Steel 316 (superior corrosion resistance), as well as other alloys upon request.
Q5: Do you offer bulk packaging and custom labeling for large orders?
A: Yes. We cater to B2B clients with bulk packaging options (e.g., boxes, drums, palletized loads) and can provide custom labeling, kitting, or bagging to integrate seamlessly with your assembly line or warehouse system.
Contact our sales team today for a competitive quote, technical data sheets, or to discuss your specific requirements for the 1/4-20 x 1 3/4 hex bolt and other industrial fasteners.

