News and Events

Mill Test Certificate (MTC) is a critical document for fastener export projects. Many export orders are detained or rejected overseas simply due to inconsistent heat numbers, mismatched material grades and non-compliant certificate formats. This article sorts out the standard audit checklist of bolt MTC, distinguishes MTC from COA, lists frequent non-conformity risks and provides a complete pre-shipment inspection process, helping fastener suppliers avoid huge losses caused by certificate issues.

This article addresses the frequent rust issue of fasteners caused by container rain during ocean transportation for foreign trade. It analyzes the corrosion mechanism of container condensation, compares multiple marine anti-rust packaging solutions, sorts out common misunderstandings of export packaging, and provides standardized packing procedures. It helps purchasing and engineering teams avoid the risk of cargo rejection due to rust upon arrival, and reduce claim and rework losses on overseas orders.

Targeting overseas heavy industry frequent failure caused by incorrect stud bolt engagement depth, this article explains load transfer principle of double-ended threads, lists risks of insufficient base engagement and improper nut side thread length. It supplies reference table for different base materials and standardized assembly steps for pressure vessel and mold equipment. Help engineering and purchasing teams avoid thread pull-out and reduce on-site rework loss.

Aiming at the hidden batch failure risk of high strength bolts breaking days after electroplating assembly in overseas heavy industry projects, this article analyzes the hydrogen embrittlement mechanism, compares hydrogen risk levels of different coating processes, sorts out high frequency procurement pitfalls, and outputs standard prevention rules including bake-out process and zinc flake coating selection. It helps overseas engineering teams avoid batch scrap and quality disputes caused by delayed fracture.

Targeting the habitual pitfall of overseas procurement teams that every bolt joint must be equipped with both a plain washer and a spring washer, this article analyzes the structural differences between the two washers, clarifies the stress concentration and preload inaccuracy caused by over-stacking, and outputs standardized matching rules. It helps overseas engineering teams avoid wrong complete-set matching and improve connection reliability.