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Home Product 5/16-18x3-1/4 Threaded Fastener, Steel Screw Bolt, Corrosion Resistant, Automotive Machinery
US hexagon socket head cap 5/16-18*3-1/4

5/16-18x3-1/4 Threaded Fastener, Steel Screw Bolt, Corrosion Resistant, Automotive Machinery

5/16-18x3-1/4 screws
5/16-18 thread bolts
3-1/4 inch machine screws
5/16-18*3-1/4
5/16-18x3-1/4 screws with 5/16-18 thread bolts specification, engineered as durable 3-1/4 inch machine screws for precision fastening in industrial assemblies and mechanical applications.
Categories:Fasteners & Fixings
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Product Description

The 5/16-18x3-1/4 screws feature a standard 5/16-18 thread pattern with a 3-1/4 inch shaft length, designed for precision fastening in industrial assemblies. These 5/16-18 thread bolts operate within a temperature range of -40°F to 450°F (-40°C to 232°C) and are compatible with standard nut sizes for direct integration into structural or mechanical modules. Constructed from high-grade steel with zinc plating, they provide corrosion resistance and a tensile strength up to 120,000 PSI, ideal for automotive, construction, and machinery sectors. The 3-1/4 inch machine screws require 0.3125-inch clearance holes and ensure secure mounting in high-vibration environments. Key advantages include durability and standardized compatibility, though specialized tools may be needed for installation in confined spaces. Not applicable to electrical interfaces, battery systems, or screen-based components.
Parameter Specification
Thread Specification 5/16-18 UNC
Nominal Diameter 0.3125" (5/16 inch / 7.94 mm)
Threads per Inch 18 TPI
Fastener Length 3-1/4" (82.55 mm)
Thread Pitch 1.411 mm
Head Style Pan Head / Hex Head / Flat Head
Drive Type Phillips #2 / Slotted / Hex Socket
Material Stainless Steel 18-8 / Carbon Steel
Surface Finish Zinc Plated / Plain / Black Oxide
Thread Direction Right-Handed
Package Quantity 100 pieces per box
question:Why are shipping costs so high? Are there cheaper options?
answer:Shipping costs depend on carrier rates and delivery speed. We offer economy shipping for cost-effective solutions.
question:Do you accept payment after delivery?
answer:Initial orders require upfront payment. Custom terms may be considered for established clients after evaluation.
question:Can I track my shipment in real-time?
answer:Yes, a tracking number is provided upon shipment. Monitor delivery status via the carrier’s official platform.
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:Why are shipping costs so high? Are there cheaper options?
answer:Shipping costs depend on carrier rates and delivery speed. We offer economy shipping for cost-effective solutions.
question:Do you accept payment after delivery?
answer:Initial orders require upfront payment. Custom terms may be considered for established clients after evaluation.
question:Can I track my shipment in real-time?
answer:Yes, a tracking number is provided upon shipment. Monitor delivery status via the carrier’s official platform.
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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