Fastener grade labeling is easy to overlook until the wrong parts reach the warehouse or job site. A carton may say “M16 bolts,” but without grade, material, finish, and batch information, receiving teams cannot confirm whether the goods match the purchase order.

For industrial buyers, wrong-spec delivery is not only a paperwork issue. It can lead to assembly failure, customer claims, project delays, or costly sorting work.

Why Grade Labeling Matters

Fastener grade defines mechanical performance. A class 8.8 bolt is not the same as class 10.9. A2-70 stainless steel is not the same as A4-80. ASTM A193 B7 stud bolts should not be mixed with general carbon steel rods.

买家采购 高强度紧固件 should treat grade labeling as part of quality control, not only packaging.

What Should Be on a Fastener Label?

A clear label should allow warehouse staff to identify the product without opening every carton.

For full product planning, buyers can review 紧固件产品 before setting labeling rules.

Common Grade Labeling Mistakes

Mixing Grade Systems

Metric property classes and inch-grade systems should not be mixed casually.

For example, metric class 10.9 and SAE Grade 8 are not the same label system, even if both are high-strength categories. The PO, carton label, packing list, and inspection report should use the same system.

Missing Stainless Steel Grades

For stainless steel orders, labels should clearly show 304, 316, A2-70, A4-70, or A4-80 where applicable. This is especially important for 不锈钢紧固件 used in outdoor, marine, or chemical applications.

Vague Surface Finish Terms

“Galvanized” may mean zinc plated or hot-dip galvanized. These are different finishes. For corrosion-sensitive orders, compare 涂层紧固件 and require exact finish wording on labels.

Buyer’s Labeling Checklist

发货前请确认：

1. Carton labels match the PO.
2. Grade appears clearly on each carton.
3. Batch number matches the inspection report.
4. Mixed-size orders have separate labels.
5. Labels match the packing list and invoice.
6. Custom parts show drawing or item number.
7. Private label requirements are approved before packing.

对于基于绘图的项目，请使用 定制非标紧固件 and include the drawing revision on the label.

最终建议

Fastener grade labeling prevents wrong-spec delivery before it becomes a warehouse or field problem. A good label should connect the product, purchase order, batch, inspection report, and final application.

Clear labeling is simple, but it protects the entire supply chain.