Bulk 5/8"-18 Grade 8 Hex Cap Screws (Zinc Yellow CR+6 Bake, UNF)

Robust Fasteners for Industrial & Manufacturing Needs

Enhance the reliability of your assemblies with our 5/8"-18 Grade 8 Hex Cap Screws, featuring a zinc-yellow CR+6 bake for excellent corrosion protection. Boasting fine (UNF) threads, these screws provide strong clamping force and greater vibration resistance—ideal for automotive, machinery, and high-stress industrial applications.

Note – PT = Partial Thread

Key Features

• Diameter: 5/8 inch
• Thread Size: 5/8"-18 – UNF (Fine) Thread
• Length Options: Offered in multiple lengths to fit diverse project needs
• Thread Length: May be fully or partially threaded depending on overall screw length
• Wrench Size (Across Flats): 15/16 inch (standard hex head)
• Material & Finish: Grade 8 alloy steel with zinc-yellow CR+6 bake
• Type: Hex Cap Screw
• System of Measurement: Inch (Imperial / US)
• Specifications: Conforms to ASTM B18.2.1
• Matching Nuts & Washers: 5/8"-18 Nuts & Washers Available Here

Bulk Ordering Advantages

Opting for bulk purchases ensures lower per-piece costs and a consistent supply of these high-performance fasteners. Ideal for manufacturers, large contractors, or industrial facilities handling frequent, high-volume projects.

Material Properties

• Grade 8 Strength: Built to endure elevated torque and load demands.
• Corrosion Resistance: Zinc-yellow finish with CR+6 bake combats rust and oxidation.
• Fine Thread Precision: UNF threading ensures tighter clamping and better vibration control.

Ideal Applications

• Automotive & Engine Components
• Industrial Machinery & Production Lines
• Construction & Structural Reinforcement
• Agricultural & Heavy Equipment
• General Manufacturing & Repair Operations

Why Monster Bolts?

Since 2012, Monster Bolts has delivered industrial-grade fasteners backed by:

• Reliability: Compliance with ASTM standards ensures consistent performance.
• Competitive Bulk Pricing: Capitalize on volume discounts to lower overall costs.
• Wide Inventory & Prompt Shipping: We maintain a robust stock to help minimize project delays.
• Expert Support: Our seasoned team is on hand to offer product recommendations and technical guidance.

Installation Tips

• Select the proper hex wrench or impact socket to avoid damage to threads or heads.
• Clean and lubricate threads prior to assembly for accurate torque readings and a secure fit.
• Combine with Grade 8 nuts and washers to maximize clamping strength and overall reliability.

Note: Nuts and washers are sold separately.

Secure Your Bulk Supply Today

Don’t compromise on quality or performance. Order 5/8"-18 Grade 8 Hex Cap Screws in bulk and experience the combined benefits of cost savings, dependable stock, and top-tier service from Monster Bolts.

✔️ Trusted by professionals in automotive, industrial, and construction sectors

✔️ Zinc-yellow CR+6 finish for superior corrosion protection

✔️ Meets ASTM B18.2.1 standards for proven reliability