When sourcing pipe nipples for plumbing, oil & gas, or industrial projects, nothing matters more than knowing the product meets recognized quality standards. Poorly manufactured nipples can lead to leaks, pressure failures, and costly downtime. In this guide, we break down the five most important standards every buyer and engineer should understand — including ASTM A733, MSS SP-95, ASME B1.20.1, and others — so you can make informed decisions and choose a reliable pipe nipple