Bridge and structural buyers need more than a high-strength grade on a quotation. The order must connect the design standard, bolt and nut assembly, coating, tightening method, inspection documents and release schedule. This guide outlines a practical review path for projects that specify Grade 8.8 or 10.9 fasteners.
Start with the project standard
Confirm whether the requirement references GB/T, DIN, ISO, EN or another project standard. For structural assemblies, check the exact bolt, nut and washer combination rather than treating “10.9 bolt” as a complete description. The Grade 10.9 structural bolt page is a starting point for comparing the listed references.
Match the assembly and tightening method
State the bolt property class, compatible nut class, washer standard, thread length and required tightening or torque method. Torque depends on friction, lubrication, coating and the joint design; it should be confirmed by the project engineer or the applicable standard. A general web value should not replace the project procedure.
Separate material, coating and documents
For each line, record material or property class, finish, size range, inspection scope and batch identification. If the project requires material certificates, dimensional reports, hardness or tensile results, list those requirements before production. Request only documents that the supplier can confirm for the specific order.
Plan staged delivery for large line lists
Large infrastructure orders often contain several diameters, lengths and finishes. Split the list into stocked items, scheduled production and drawing-review items. Yuanpai supports mixed-container purchasing, small-batch requests and OEM packaging where the order scope allows. Eligible orders may use up to 180 days of free storage, while stocked items may qualify for the fastest 96-hour dispatch after confirmation.
Pre-approval checklist
- Design standard and permitted equivalent
- Bolt, nut and washer compatibility
- Property class, material and finish
- Thread length and grip length
- Tightening method and inspection scope
- Batch records, packing marks and release dates
Compare the high-strength bolt range, review the torque calculation guide, and send the complete project specification for a quote.