Why Imperial Fasteners Still Persist: Global Supply Chain Realities in Aerospace and Automotive Procurement
The global fastening landscape is shaped by history, engineering standards, and supply‐chain realities. While nearly all countries have officially adopted the metric system, inch-based (imperial) fasteners remain deeply entrenched in U.S. aerospace and many automotive applications. Procurement managers must understand why these legacy units persist and how they affect sourcing and standardization. This whitepaper examines the historical roots, technical nuances, and practical implications of imperial vs. metric fastener usage, with a focus on aerospace and automotive industries and the challenges of a dual-standard supply chain. Historical & Technical Roots of [...]