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Home Product 5/16-18*1-3/8 Hex Head Cap Screw 18-8 Stainless Steel Grade 8 Machine Bolt Fastener
US hexagon socket head cap 5/16-18*1-3/8

5/16-18*1-3/8 Hex Head Cap Screw 18-8 Stainless Steel Grade 8 Machine Bolt Fastener

5/16-18x1-3/8 screw
5/16-18 machine bolt
1-3/8 threaded fastener
5/16-18*1-3/8
5/16-18x1-3/8 screw, precision-engineered 5/16-18 machine bolt and heavy-duty 1-3/8 threaded fastener for industrial machinery, automotive assemblies, and construction hardware installations.
Categories:Fasteners & Fixings
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Product Description

The 5/16-18x1-3/8 screw is a high-strength threaded fastener designed for secure assembly in industrial applications. This 5/16-18 machine bolt features a 1-3/8" shank length with unified coarse threading (5/16" diameter, 18 threads per inch), compatible with standard nuts and tapped holes. Constructed from corrosion-resistant grade materials (e.g., stainless steel or zinc-plated steel), it operates in temperature ranges from -40°C to 120°C (-40°F to 250°F), suitable for heavy machinery, automotive systems, and structural frameworks. With tensile strength up to 120,000 PSI, this 1-3/8 threaded fastener provides vibration resistance but requires precise torque application to avoid material stress. Typical applications include hydraulic equipment, conveyor systems, and construction assemblies where reliable fastening under mechanical load is critical.
Parameter Specification
Thread Size 5/16-18 UNC
Nominal Diameter 0.3125" (5/16")
Threads Per Inch 18 TPI
Fastener Length 1.375" (1-3/8")
Head Style Hex Head
Drive Type External Hexagon
Material Grade SAE J429 Grade 5
Surface Finish Zinc Plated
Tensile Strength 120,000 PSI
Thread Engagement Fully Threaded
Compliance Standard ASTM A574
question:Do you offer technical selection services?
answer:Yes, we provide customized technical solutions tailored to client requirements.
question:What is the warranty policy?
answer:Standard warranty covers defects for 12 months from delivery date.
question:How is a refurbished product handled if it malfunctions?
answer:We offer replacement or refund immediately and investigate to prevent recurrence.
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:Do you offer technical selection services?
answer:Yes, we provide customized technical solutions tailored to client requirements.
question:What is the warranty policy?
answer:Standard warranty covers defects for 12 months from delivery date.
question:How is a refurbished product handled if it malfunctions?
answer:We offer replacement or refund immediately and investigate to prevent recurrence.
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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