Description
Monster Overview
Fix your project right the first time with Bulk 5/16"-18 UNC Hex Cap Screws from Monster Bolts — USA-Made in 18-8 (304) stainless steel to ASTM F593. These coarse-thread, corrosion-resistant fasteners are built for industrial, marine, construction, and outdoor environments where quality, compliance, and reliability matter.
Note: (PT) denotes partial thread fasteners.
Monster Features
- USA Made: Precision manufacturing and lot traceability to ASTM F593 (304 series).
- Corrosion Resistant: 18-8 stainless excels in moisture, salt-air, and outdoor exposure.
- Hex Cap Design: Standard hex head for strong clamping and easy wrench access.
- RoHS Compliant: Finish and material meet RoHS requirements.
Monster Specifications
| Property | Details |
|---|---|
| Diameter & Thread | 5/16"-18 UNC (coarse) |
| Head / Drive | Hex cap head / 1/2" wrench (typical) |
| Material | 18-8 (Type 304) Stainless Steel |
| Specification | ASTM F593 (USA-Made, 300-series stainless) |
| Finish | Plain (natural stainless) |
| Threading | Partial Thread (PT) on longer lengths |
| Compliance | RoHS compliant |
Applications & Industries
- Marine & Coastal: Boat builds, docks, and hardware in salt-air environments.
- Industrial Machinery: Frames, mounts, and fixtures requiring reliable clamping.
- Construction & Fabrication: Structural connections and field assemblies.
- Automotive / Fleet: Corrosion-resistant hardware for service exposure.
- Food & Chemical Processing: Clean stainless solution where hygiene matters.
Installation Tips
- Use a proper-fit wrench: Prevents head rounding and ensures correct torque.
- Apply anti-seize: Helps prevent thread galling common to stainless-on-stainless.
- Follow torque guidance: Tighten to spec for consistent clamping force.
Bulk Purchasing Advantages
- Lower unit cost: Save with bulk cartons for production and field service.
- Lot consistency: Single-lot fulfillment for uniform appearance and fit.
- Reliable inventory: Keep critical sizes on hand for uninterrupted jobs.
- Contractor ready: Built for OEMs, fabricators, and pro installers.
Matching Products
Complete your assembly with 5/16"-18 Stainless Nuts and Stainless Washers.
Order Yours Today
Build with confidence. Choose USA-Made 5/16"-18 Hex Cap Screws in 18-8 stainless (ASTM F593) for dependable strength, corrosion resistance, and compliance on every job.
Need assistance? Contact our support team | Shipping & Returns