R.L. Stephens Tool 7 16-20 UNF 2B Threaded Plug Gage GO.4050 NOGO.4104 is an internal-thread plug gauge used to verify 16-20 UNF threads with a 2B tolerance. The GO end is sized to.4050 inches, allowing acceptance of threads that fit within specification, while the NOGO end at.4104 inches serves as the maximum limit to reject oversized or undersized threads. This gauge supports go/no-go inspection of threaded holes in precision parts, ensuring proper engagement and tolerance compliance in manufacturing and quality-control workflows that use the 16-20 UNF 2B thread form.
