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Home Product 1/4-20 x 3-1/2 Hex Head Cap Screw SAE Grade 8 Stainless Steel Fasteners for Automotive Machinery
US hexagon socket head cap 1/4-20*3-1/2

1/4-20 x 3-1/2 Hex Head Cap Screw SAE Grade 8 Stainless Steel Fasteners for Automotive Machinery

1/4-20 hex bolts
3.5 inch machine screws
20 TPI threaded fasteners
1/4-20*3-1/2
1/4-20 hex bolts, 3.5 inch machine screws with 20 TPI threaded fasteners for secure mechanical assemblies and industrial applications. Zinc-plated steel hex head screws with full thread engagement.
Categories:Fasteners & Fixings
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Product Description

The 1/4-20 hex bolts are precision 20 TPI threaded fasteners designed for industrial assembly, featuring a 3.5-inch machine screw configuration with 1/4-inch nominal diameter. These grade-8 steel fasteners operate effectively across temperatures from -40°C to 120°C, ideal for heavy machinery, automotive frameworks, and structural applications requiring 20 threads-per-inch accuracy. The hexagonal head design enables secure torque application up to 35 ft-lbs using standard tools. Zinc-plated surface treatment ensures corrosion resistance in outdoor and high-humidity environments. Key advantages include vibration resistance and ISO-compliant thread engagement, though specialized installation tools are recommended for optimal clamping force. Compatible with all 1/4-20 threaded components, these fasteners maintain dimensional stability under 250 MPa tensile stress loads.
Parameter Specification
Thread Size 1/4-20 UNC
Threads Per Inch (TPI) 20 TPI
Shank Length 3.5 inches (88.9 mm)
Head Type Hexagonal (Hex Bolt)
Material Grade ASTM A307 / SAE J429 Grade 2
Surface Finish Zinc Plated (Corrosion Resistant)
Thread Engagement Fully Threaded Machine Screw
Head Width 7/16" (11.1 mm) Across Flats
Torque Capacity 7-10 ft-lb (9.5-13.6 Nm)
Proof Load 4,250 psi (29.3 MPa)
question:Can I schedule a self-pickup with the official courier service?
answer:Yes, you can arrange self-pickup via our logistics portal after order confirmation.
question:Do you provide technical selection guidance?
answer:Yes, we offer technical consultation to help choose suitable products for your needs.
question:Why was the product label removed upon delivery?
answer:Labels are removed to comply with regional distribution agreements or customs requirements.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
question:Can I schedule a self-pickup with the official courier service?
answer:Yes, you can arrange self-pickup via our logistics portal after order confirmation.
question:Do you provide technical selection guidance?
answer:Yes, we offer technical consultation to help choose suitable products for your needs.
question:Why was the product label removed upon delivery?
answer:Labels are removed to comply with regional distribution agreements or customs requirements.
question:Can the company ensure stable product supply?
answer:Yes, we maintain long-term partnerships and strict inventory management.
question:Why is there a transaction fee?
answer:The fee covers payment processing and administrative costs for secure transactions.
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