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 Steel Washer is a load-distribution component engineered specifically for use in storage tank and silo bolt assemblies. Working together with
the Fin Neck Bolt and Rubber Sealing Washer, it distributes clamping force evenly across the tank panel surface — protecting the panel
coating and ensuring long-term joint stability.
Supplied as part of our complete Fin Neck Bolt Kit, or available separately for replacement and bulk procurement.
✓ Precision stamped — consistent dimensions across every batch
✓ Corrosion-resistant surface treatment for outdoor and wet environments
✓ Pre-matched to our Fin Neck Bolt system for guaranteed fit
✓ Compatible with 1/2" UNC and M12 / M16 fin neck bolt systems
✓ Batch quality inspection reports provided with every order
✓ Unit weight 8.5 kg per 1,000 pcs — efficient for bulk handling
| Specification | Detail |
| Compatible with | 1/2" UNC / M12 / M16 Fin Neck Bolt systems |
| Surface treatment | HDG / Dacromet (specify on order) |
| Unit weight | 8.5 kg per 1,000 pcs |
| imensional spec | Available on request |
| Quality standard | International standard compliant |
| Traceability | Batch inspection report included |
| Sold as | Individual pieces or as part of complete kit |
【Why Washer Selection Matters in Tank Assembly】
✓ Undersized washers concentrate stress — leading to panel cracking
✓ Uncoated washers rust and stain tank panels in outdoor installations
✓ Our steel washers are pre-matched to our bolt head dimensions —
eliminating bearing surface mismatch
✓ HDG and Dacromet options available to match your project specification
【Applicable Tank Types】
✓ FRP water storage tanks — protects gel coat surface from bolt damage
✓ Steel bolted storage tanks — full contact bearing on corrugated panels
✓ Grain silos — galvanized finish for long-term outdoor exposure
✓ Petrochemical and chemical storage tanks
✓ Industrial liquid and dry bulk storage
Interested in specifications, pricing or samples?
Dimensional drawings, material certificates and surface treatment
specifications are available to qualified buyers upon request.
Response within 24 hours.
To enquire, please provide:
- Required bolt size (1/2" UNC / M12 / M16)
- Preferred surface treatment (HDG or Dacromet)
- Estimated annual volume
→ [Contact Us for Technical Details and Pricing]
Related Products:
- 1/2" UNC Fin Neck Bolt Kit — complete 5-piece assembly kit
- M12 / M16 Fin Neck Bolt Kit — metric complete assembly kit
- Rubber Sealing Washer — EPDM sealing washer working with Steel Washer
- Heavy Hex Nut — high-strength nut for tank bolt systems
- Plastic Cap — PA66 protective cap completing the assembly
Related Pages:
- Quality & Testing — in-house laboratory and QC standards
- Quality Certificate — ISO 9001:2015 certification
- Contact Us — technical enquiries welcome
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)