Used as Go/No-Go gage by setting upper and lower limits.
Flatness of anvil: 59_in.
Parallelism between tips and anvil: range 0-1.26″: 118_in,
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Insize 4634-48, NPT THREAD RING GAGE, 4x8NPT, 6928640347078
3M 87105, Cubitron II Stikit Film Disc 775L, 220+, 6 in x NH, Linered w/Tab, Die 600Z, 7100075221, 250 per case 