Transportation infrastructure requires consistent fastener dimensions, strength, corrosion protection and packing across repeated installation lots. YONGYI supports project inquiries for bolts, nuts, washers, anchors, foundation bolts and threaded products against the confirmed purchase list, drawing or standard.
Selected project references
The following project names are selected fastener supply references recorded in YONGYI company materials:
- G7 Beijing–Xinjiang Expressway
- G1 Beijing–Harbin Expressway
- G3012 Korla–Aksu section
- G30 Chaiwopu–Urumqi section
- Xi’an Metro segment bolt supply reference
- Beijing Metro Line 8
- Shanghai Metro Line 3
- Tianjin Metro Line 3
- Chengdu Metro Line 3
Fastener requirements reviewed for this application
The correct specification depends on the structural location and project documents. A complete review normally covers:
- Bolt, nut, washer, anchor or threaded-rod type and assembly combination
- DIN, GB, ISO or project drawing reference, including revision when applicable
- Diameter, thread pitch, length, property class or material grade
- Hot-dip galvanized, zinc-plated, black or other specified surface treatment
- Inspection, marking, lot identification, packing and delivery requirements
How YONGYI supports project inquiries
YONGYI reviews the purchase list, drawing or applicable standard before confirming the product configuration. Production, inspection, packing and shipment documents are then aligned with the accepted quotation and order requirements.
For a project quotation, send the fastener type, standard or drawing, dimensions, grade, surface finish, quantity, required documents and destination to sales@yyfasteners.com. You can also review our production and inspection facilities and management system certificates.
