1/4-20 Hex Bolt: High-Strength Fastening Solution for Industrial Applications
In the demanding world of industrial manufacturing and construction, the integrity of every connection is paramount. The 1 4 20 hex bolt stands as a fundamental component in this ecosystem, providing reliable, high-strength fastening for a vast array of assemblies. Engineered to meet rigorous standards, this specific bolt size—1/4 inch in diameter with 20 threads per inch—offers an optimal balance of strength, versatility, and ease of use. This product page details the specifications, advantages, and ideal applications of our premium-grade hex bolts, designed for professionals who cannot compromise on quality.
Product Overview
Our 1/4-20 hex bolt is a precision-manufactured fastener featuring a hexagonal head designed for wrench or socket application. It is a coarse-thread (UNC) bolt, making it highly resistant to cross-threading and ideal for quick assembly in a variety of materials, including steel, aluminum, and certain plastics. Manufactured from high-grade materials and subjected to stringent quality control, each bolt ensures consistent performance, dimensional accuracy, and superior corrosion resistance, making it a trusted choice for OEMs, MRO operations, and trade distributors worldwide.
Key Features
- Premium Material: Fabricated from Grade 5 medium carbon steel or A2/A4 stainless steel, offering excellent tensile strength and durability.
- Precision Threading: Uniform 20 TPI UNC threads ensure smooth engagement, reducing the risk of stripping and ensuring a secure fit.
- Hexagonal Head Design: Provides a secure grip for standard tools, allowing for high torque application and easy installation/removal even in confined spaces.
- Surface Finishes: Available in zinc plating (yellow or clear chromate), hot-dip galvanizing, or plain finishes to meet specific environmental and aesthetic requirements.
- Full Traceability: Batch-controlled manufacturing ensures consistent quality and compliance with international standards such as ASME, SAE, and DIN.
Technical Specifications
| Parameter | Specification | Details / Standard |
|---|---|---|
| Size Designation | 1/4-20 UNC | Nominal Diameter: 1/4", Threads Per Inch: 20 |
| Common Lengths | 1/2" to 4" | Other lengths available upon request (custom orders) |
| Head Style | Hex Cap Screw | Width Across Flats: 7/16" |
| Material Grades | Grade 5, A2-70, A4-80 | Medium Carbon Steel, Austenitic Stainless Steel (304/316) |
| Tensile Strength | 120,000 psi (Grade 5) | Minimum; meets or exceeds SAE J429 standards |
| Drive Type | Hex Socket / Wrench | Standard 7/16" wrench size |
| Common Finishes | Zinc Plated, HDG, Plain | Corrosion resistance varies by finish |
| Standards Compliance | ASME B18.2.1, SAE J429 | Interchangeable with DIN 933/931 |
Application Scenarios
The versatility of the 1 4 20 hex bolt makes it indispensable across numerous sectors. Its robust design is suited for applications requiring a reliable, load-bearing fastener.
- Machinery & Equipment: Assembly of frames, guards, panels, and components in agricultural, packaging, and textile machinery.
- Metal Fabrication: Structural connections in steel frameworks, brackets, and supports.
- Automotive & Transportation: Securing non-critical engine components, interior trim, and accessory mounting in vehicles and trailers.
- Construction: Fastening in light structural applications, HVAC ducting, and electrical enclosure assembly.
- Furniture & Fixtures: Heavy-duty assembly for commercial shelving, workbenches, and display units.
Advantages
Choosing our hex bolts provides tangible benefits that impact your project's efficiency, cost, and longevity.
- Superior Load Distribution: The hex head design allows for even distribution of clamping force, minimizing point stress on joined materials.
- Enhanced Durability: Manufactured from controlled materials, our bolts resist shear, vibration, and fatigue failure.
- Streamlined Inventory: As a standard and highly common size, stocking the 1/4-20 hex bolt simplifies procurement and reduces SKU complexity.
- Global Compatibility: Conforms to major international standards, ensuring parts are interchangeable in global supply chains.
- Cost-Effective Reliability: Prevents costly downtime and rework by providing a consistently high-quality, failure-resistant fastener.
Why Choose Us
As a leading supplier in the industrial fasteners sector, we distinguish ourselves through commitment to excellence and customer partnership.
- Direct Manufacturer & Exporter: We control the entire production process, from raw material sourcing to final inspection, ensuring competitive pricing and quality assurance.
- Extensive Inventory: Large stocks of the 1 4 20 hex bolt in various grades, lengths, and finishes enable fast delivery and reliable supply.
- Technical Support: Our engineering team can assist with material selection, specification questions, and custom requirements.
- Flexible Packaging & Logistics: We offer bulk packaging, custom labeling, and have extensive experience in managing efficient international logistics for B2B clients.
- Quality-Certified Production: Our facilities operate under strict quality management systems, with material certifications provided for every shipment.
FAQ
What is the difference between a 1/4-20 hex bolt and a hex cap screw?
In modern industrial terminology, especially within standards like ASME, the terms are often used interchangeably for fasteners over a certain length. Both have a hexagonal head. Generally, a "cap screw" is designed to be used with a nut or tapped hole and is fully threaded, while a "bolt" may have an unthreaded shank. Our 1/4-20 hex bolt product is manufactured to cap screw standards for superior strength.
What wrench size is needed for a 1/4-20 hex head?
The standard width across flats for a 1/4" hex head is 7/16 inch. Therefore, a 7/16" wrench or socket is the correct tool for installation.
Can I get these bolts in stainless steel for outdoor use?
Absolutely. We offer A2-70 (304) stainless steel for general corrosion resistance and A4-80 (316) stainless steel for superior resistance in highly corrosive environments like marine or chemical applications. These are excellent choices for outdoor or wet conditions.
Do you offer custom lengths or special markings?
Yes, we specialize in custom manufacturing. We can produce 1/4-20 hex bolts in non-standard lengths, with special head markings for traceability, or with unique platings/coatings to meet specific OEM requirements. Contact our sales team with your specifications.
What is the typical lead time for bulk orders?
For standard items from our inventory, we can often ship within 3-5 business days. For large custom orders, typical production lead times range from 4-6 weeks, depending on the order complexity and volume. We provide firm timelines upon order confirmation.
