Description
Product Overview
Achieve high-strength, fine-thread clamping with Bulk 5/8"-18 Grade 8 Hex Cap Screws in a corrosion-resistant zinc yellow CR+3 finish. These Made in USA UNF-thread bolts are ideal for automotive assemblies, machinery, industrial equipment, and precision fixtures where tighter adjustment and enhanced vibration resistance are required.
Manufactured from alloy steel to meet SAE J429 Grade 8 mechanical properties, these screws deliver excellent tensile strength and reliable performance in demanding environments. The CR+3 chromate-converted zinc coating helps protect against corrosion and remains RoHS compliant, aligning with modern regulatory standards.
These fasteners are part of the Monster Bolts Made in USA Fasteners Collection, with fast shipping from Florida and knowledgeable support behind every order.
Key Features
- Size: 5/8"-18 UNF (fine thread)
- Strength: High-strength Grade 8 alloy steel
- Thread Style: Fine-thread UNF for better vibration resistance and precise torque control
- Finish: Zinc Yellow CR+3 for corrosion resistance and easy identification
- Compliance: CR+3 finish is RoHS compliant
- Origin: Proudly Made in USA
- Applications: Automotive, machinery, fixtures, industrial equipment, and fabrication
- Bulk Packaging: Monster Bolts bulk quantities offer the lowest cost per piece for individuals and businesses needing larger volumes.
Monster Specifications
| Specification | Details |
|---|---|
| Diameter | 5/8" (0.625") |
| Thread Size | 5/8"-18 UNF (fine thread) |
| Head Style | Hex cap screw / hex bolt |
| Wrench Size | 15/16" 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 |
| System of Measurement | Inch / SAE |
| Lengths Available | Available in common 5/8-18 lengths; select above. |
| Packaging | Monster Bolts bulk quantities offer the lowest cost per piece for individuals and businesses needing larger volumes. |
Matching Nuts & Washers
Pair these bolts with USA-made complementary hardware:
- 5/8-18 hex nuts (fine-thread, Made in USA)
- Flat & lock washers for proper load distribution and vibration control
- For marine and rigging projects, explore our USA-machined cable & rigging components
Why Choose Monster Bolts?
- Made in USA quality for mission-critical builds
- Bulk value pricing that lowers your cost per piece
- Fast shipping from our Florida warehouse
- Knowledgeable support from a fastener-focused team
Order Yours Today
Keep your bins stocked with Made in USA 5/8-18 Grade 8 hex cap screws in zinc yellow CR+3 finish. Select your length and bulk quantity above, then click "Add to Cart" to equip your shop with dependable UNF hardware.