Description
Product Overview
Step up to precision-grade fastening with Bulk 5/16"-24 Grade 8 Hex Cap Screws in a bright, durable zinc yellow CR+3 finish. Made in the USA for consistent reliability, these fine-thread UNF bolts provide stronger vibration resistance and finer adjustment control compared to 5/16-18 coarse-thread hardware.
Manufactured from premium alloy steel and built to SAE J429 Grade 8 performance standards, these fasteners offer excellent strength and a clean, professional appearance. The CR+3 zinc yellow plating delivers enhanced corrosion resistance while remaining RoHS compliant, making them ideal for industrial, automotive, and precision equipment applications.
As part of our Made in USA Fasteners Collection, these screws offer dependable performance backed by fast shipping and real support from Monster Bolts.
Key Features
- Size: 5/16"-24 UNF (fine thread).
- Strength: High-strength Grade 8 alloy steel.
- Thread Type: UNF fine thread for better tuning accuracy and improved vibration resistance.
- Finish: Zinc Yellow CR+3 for corrosion resistance and easy identification.
- RoHS Compliance: CR+3 yellow zinc meets modern environmental and regulatory requirements.
- Origin: 100% Made in USA for consistent manufacturing and traceability.
- Applications: Automotive, machinery, industrial tools, jigs/fixtures, and precision assemblies.
- Bulk Packaging: Monster Bolts bulk quantities offer the lowest cost per piece for individuals and businesses needing larger volumes.
Monster Specifications
| Specification | Details |
|---|---|
| Diameter | 5/16" (0.3125") |
| Thread Size | 5/16"-24 UNF (fine thread) |
| Head Style | Hex cap screw / hex bolt |
| Wrench Size | 1/2" hex wrench/socket |
| Material | Alloy steel, Grade 8 |
| Finish / Plating | Zinc yellow CR+3 (chromate-converted zinc), RoHS compliant |
| Country of Origin | Made in USA |
| Standards | ASME B18.2.1 dimensions, SAE J429 Grade 8 mechanical properties |
| Measurement System | Inch / SAE |
| Lengths Available | Offered in a range of common fine-thread lengths; select above. |
| Packaging | Monster Bolts bulk quantities offer the lowest cost per piece for individuals and businesses needing larger volumes. |
Matching Nuts & Washers
Complete your hardware setup with USA-made 5/16-24 nuts and washers:
- Fine-thread 5/16-24 hex nuts available under the USA Fasteners collection.
- Washers: Choose USA-made flat and lock washers for proper load distribution and vibration resistance.
- For marine or lifting hardware, visit our USA-machined cable & rigging components.
Why Choose Monster Bolts?
- Made in USA: Reliable, traceable fasteners for demanding applications.
- Bulk Value: Lowest cost-per-piece options for shops and production environments.
- Fast Fulfillment: Ships quickly from our Florida warehouse.
- Trusted Support: Fastener specialists ready to assist with technical or order questions.
Order Yours Today
Keep your bins stocked with Made in USA 5/16-24 Grade 8 hex cap screws in zinc yellow CR+3 plating. Choose your required length and quantity above and click "Add to Cart" for dependable, high-strength UNF hardware.