Bulk 1/4"-28 Grade 8 Hex Cap Screws (Fine Thread, Alloy Steel, Plain Finish)

Precision Fasteners for Automotive, Aerospace, & Industrial Applications

Secure your assemblies with high-strength 1/4"-28 Grade 8 Hex Cap Screws, made from premium alloy steel with a plain (unplated) finish. Designed with fine-thread (UNF) technology, these bolts provide greater clamping force and vibration resistance, making them ideal for automotive, aerospace, precision engineering, and industrial applications.

Note – PT = Partial Thread

Key Features

• Diameter: 1/4 inch
• Thread Size: 1/4"-28 – UNF (Fine) Thread
• Length Options: Available in various lengths for diverse applications
• Thread Length: May be fully or partially threaded depending on total screw length
• Wrench Size (Across Flats): 7/16 inch (standard hex head)
• Material: Grade 8 high-strength alloy steel
• Finish: Plain (uncoated) – suitable for applications where plating is unnecessary
• Type: Hex Cap Screw
• System of Measurement: Inch (Imperial / US)
• Specifications: Conforms to ASTM B18.2.1
• Matching Nuts & Washers: 1/4"-28 Nuts & Washers Available Here

Bulk Ordering Advantages

Purchasing in bulk reduces your per-piece cost while ensuring a consistent supply of industrial-grade fasteners. This is an ideal solution for manufacturers, aerospace engineers, automotive repair shops, and precision machining operations that require a high volume of durable hardware.

Material Properties

• High-Strength Alloy Steel: Engineered to withstand extreme stress and torque.
• Plain Finish: Uncoated for cost-efficiency where additional corrosion protection is not required.
• Fine Thread Precision: UNF threading enhances clamping force and reduces loosening from vibration.

Ideal Applications

• Automotive & Engine Components
• Aerospace & Aircraft Assembly
• Precision Manufacturing & Tooling
• Heavy Machinery & Equipment
• Maintenance, Repair & Overhaul (MRO)

Why Buy from Monster Bolts?

Since 2012, Monster Bolts has been a leading supplier of industrial fasteners, offering:

• Guaranteed Quality: All fasteners meet ASTM B18.2.1 specifications.
• Competitive Bulk Pricing: Save on high-volume orders without sacrificing quality.
• Large Inventory & Fast Shipping: Avoid project delays with our ready-to-ship stock.
• Technical Support: Our team provides expert guidance on product selection and application.

Installation Tips

• Use the correct torque settings for fine-thread fasteners to prevent over-tightening.
• Clean and lubricate threads before assembly to ensure proper seating and accurate torque readings.
• Pair with Grade 8 nuts and washers for maximum joint integrity and long-term reliability.

Note: Nuts and washers are sold separately.

Order in Bulk & Save

Get precision-engineered 1/4"-28 Grade 8 Hex Cap Screws at wholesale pricing. Perfect for high-precision, vibration-resistant fastening applications. Order today and take advantage of bulk discounts, fast shipping, and expert support from Monster Bolts.

✔️ Perfect for high-precision engineering & industrial use

✔️ Fine-thread UNF design offers superior vibration resistance

✔️ ASTM B18.2.1 compliant for guaranteed reliability