Bulk 9/16"-18 Grade 8 Hex Cap Screws (Zinc Yellow CR+6 Bake, UNF)

High-Strength Fasteners for Industrial & Automotive Applications

Achieve reliable, high-torque connections with our 9/16"-18 Grade 8 Hex Cap Screws. Finished with a zinc-yellow CR+6 bake for superior corrosion protection, these fine-thread (UNF) fasteners deliver exceptional clamping force and durability in demanding environments—perfect for automotive, machinery, and industrial projects.

Note – PT = Partial Thread

Key Features

• Diameter: 9/16 inch
• Thread Size: 9/16"-18 – UNF (Fine) Thread
• Length Options: Multiple lengths to accommodate various project requirements
• Thread Length: May be fully or partially threaded based on overall screw length
• Wrench Size (Across Flats): 13/16 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: 9/16"-18 Nuts & Washers Available Here

Bulk Ordering Advantages

By purchasing these Grade 8 hex cap screws in bulk, you reduce your per-piece costs and secure a steady inventory of reliable fasteners. Ideal for industrial facilities, automotive workshops, and manufacturers seeking consistent quality and quick turnarounds.

Material Properties

• Grade 8 Strength: Handles high torque and load requirements with ease.
• Corrosion Resistance: Zinc-yellow CR+6 plating shields against rust and wear.
• Fine Thread Precision: UNF threading provides tighter clamping force and vibration resistance.

Ideal Applications

• Automotive & Engine Components
• Industrial Machinery & Equipment
• Construction & Structural Reinforcement
• Agricultural & Heavy Equipment
• Maintenance, Repair & Overhaul (MRO)

Why Monster Bolts?

Founded in 2012, Monster Bolts has been a trusted source for professionals who demand top-quality fasteners. We pride ourselves on:

• Reliability: Each fastener meets ASTM standards for dependable performance.
• Competitive Bulk Pricing: Manage costs effectively on large-scale orders.
• Expansive Inventory & Fast Shipping: Avoid delays with our robust stock.
• Expert Assistance: Our knowledgeable team can help with product selection and technical guidance.

Installation Tips

• Use the correct wrench or impact socket to avoid head or thread damage.
• Clean and lubricate threads before assembly to ensure accurate torque and a secure hold.
• Pair with Grade 8 nuts and washers for maximum joint integrity and reliability.

Note: Nuts and washers are sold separately.

Secure Your Bulk Supply Today

Don’t compromise on quality or performance. Order 9/16"-18 Grade 8 Hex Cap Screws in bulk and enjoy the benefits of cost savings, rapid shipping, and the expert support that has made Monster Bolts a leading name in industrial and automotive fasteners.

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

✔️ Zinc-yellow CR+6 finish for enhanced corrosion resistance

✔️ Meets ASTM B18.2.1 standards for consistent reliability