Global Specialist in Fin Bolt / Silo Bolt for Storage Tanks
High‑strength bolts, nuts and washers for bolted steel silos and storage tanks.
Products Description
The Plastic Cap is a purpose-designed protective cover for fin neck bolt assemblies on FRP and steel storage tanks. Made from high-strength PA66
nylon, it shields the exposed nut and bolt end from UV, moisture and chemical exposure — extending the service life of the entire fastener
assembly.
Supplied as part of the complete Fin Neck Bolt Kit, or available separately for replacement and maintenance orders.
✓ PA66 nylon — superior strength vs standard PP caps
✓ Snap-fit design — installs in seconds, no tools required
✓ UV and chemical resistant — suitable for outdoor tank environments
✓ Compatible with 1/2" UNC and M12 fin neck bolt systems
✓ Available in Black and White to match tank panel color
| SIZE | M12 (compatible with 1/2" UNC hex nut) |
| Material | PA66 Nylon |
| Color | Black / White |
| Function | Protective cover for hex nut and bolt end |
| Installation | Snap-fit, tool-free |
| UV resistance | ✓ |
| Chemical resistance | ✓ |
| Compatible with | 1/2" UNC Fin Neck Bolt Kit / M12 Fin Neck Bolt Kit |
| Sold as | Individual pieces or as part of complete bolt kit |
The Plastic Cap can also be ordered separately for:
- Replacement of damaged or missing caps on existing installations
- Maintenance orders for tanks already in service
- Color matching when tank panels are repainted
【Applicable Industries】
✓ Water treatment tanks — protects fasteners from water and chemical exposure
✓ Grain silos — prevents moisture ingress and grain dust contamination
✓ Petrochemical storage tanks — chemical-resistant PA66 withstands harsh media
✓ Industrial silos — UV-stable for outdoor exposed installations
【Why Use a Plastic Cap】
✓ Prevents corrosion on exposed nut and thread end
✓ Eliminates sharp edge hazard during tank maintenance
✓ Keeps tank exterior clean and professional in appearance
✓ Easy to remove and replace during inspection or bolt replacement
Ordering Information:
Plastic Caps are available:
→ As part of the complete Fin Neck Bolt Kit (recommended)
→ Separately in bulk for maintenance and replacement
Minimum order and pricing available on request.
Response within 24 hours. In-stock items ship within 1 week.
To enquire, please provide:
- Required quantity
- Color preference (Black or White)
- Compatible bolt size (1/2" UNC or M12)
→ [Contact Us for Pricing]
Related Products:
1/2" UNC Fin Neck Bolt Kit
— complete assembly including Plastic Cap
M12 / M16 Fin Neck Bolt Kit
— metric complete assembly
Nylon Washer
— sealing washer for FRP panel protection
Hex Nut
— compatible heavy hex nut for tank bolt systems
Bin Bolt
— for grain silo and dry bulk storage applications
OUR ADVANTAGE
Industry Authority
FAST® Zhonglian is the first manufacturer in China to obtain dual EN 14399 & EN 15048 (SB Bolts) certifications .
Our silo bolts meet ASTM Grade 8 (150,000 PSI) and ISO 10.9 high-tensile standards .
NSF/ANSI 61 & 372 Certified (Lead-Free)
ISO 9001:2015 Quality Management
Green Supply Chain
Committed to ESG goals, we provide verified ISO 14067 Product Carbon Footprint statements.
Our screws feature a verified GHG emission of 7027.78 kg CO2e per tonne .
Traceable manufacturing via Intelligent Cloud Management System .
Global Presence
Supporting mega-infrastructure from Dubai Tower to the Riyadh Cables Group.
Local support available via our global hubs:
📍Middle East:Dubai Branch
📍Asia:Malaysia & Indonesia
Brand Identity: FAST® | 01PB (US Registered)