WSTA204.25 is a precision aviation maintenance tool compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine fastener maintenance during MRO operations. It serves as a high-precision torque wrench, specialized in accurate tightening of high-strength aviation fasteners on engine casings, blades and core assemblies. It delivers stable, calibrated torque output, ensures fastener clamping precision, prevents over-tightening induced cracking or under-tightening loosening, avoids component displacement under extreme vibration, and safeguards the structural integrity of engine assemblies. Made of premium alloy steel with hardened treatment, it resists wear and impact, featuring clear torque scale and anti-slip handle. Weighing 1.1kg, it is compact for narrow-space operation, with high torque accuracy and long durability. It is a critical tool to guarantee engine assembly reliability and overall operational safety.