LONGZE ENGINEERING

Global V-System Architecture. Precision Fastening Solutions for Heavy Infrastructure, Automated Assembly, and Renewable Energy Sectors.

🌱 15TH FIVE-YEAR PLAN / GREEN INFRASTRUCTURE READY
Flagship Standards Database (V15.3)

DIN 933 Metric Bolt

Hexagon head screws with threads up to head. Class 8.8 / 10.9 compliant.

DIN 931 Metric Bolt

Hexagon head bolts with partial thread. Fatigue-resistant transition zones.

ISO 4017 Metric Bolt

Global ISO standard hex screws. Updated wrench sizes (S) for automated tooling.

ISO 4014 Metric Bolt

ISO partial thread hex bolts. Exact grip length calculated for structural joints.

ASME B18.2.1 Imperial Bolt

UNC/UNF threads. Grade 5 and Grade 8 high-tensile specifications for US markets.

DIN 934 Metric Nut

Standard hexagon nuts. Strict Proof Load testing applied to guarantee retention.

ISO 4032 Metric Nut

Regular hex nuts (Style 1). Height profile optimized to maximize thread engagement.

DIN 125 Flat Washer

Form A/B plain washers. Superior flatness control to prevent structural embedding.

DIN 127 Spring Washer

Spring lock washers. Tangle-free design with dynamic recovery verification.

DIN 7980 Spring Washer

Specialized profile exclusively for socket head cap screws (DIN 912) counterbores.