Thread Chart (UNF-UNC) | Major and Minor Diameters
1/4 x 20 UNC (13/16"O.D.) Circular Split Die HSS - engineeringsupplies.co.uk
uxcell 1/4"-20 UNC Tap and Die Set, HSS Machine Thread Tap with Round Threading Die, Right Hand : Amazon.ca: Tools & Home Improvement
Round Dies, DIN 5158 (DIN EN 24231) , HSS-G, G 1/4 x 19 » VÖLKEL SHOP
Replace - A - Thread Thread Repair Inserts 4-40 through 1 Inch UNC and UNF Threads 10
2pcs UNEF UNF UNC Thread Tap and Die Set Machine Tapping Plug Tap Die HSS Screw Thread Tap Set Metal Drilling Tools - AliExpress
Aceteel 1 1/4"-7 UNC Tap and Die Set, 1-1/4 x 7 UNC Right Hand HSS Machine Thread Tap and 1-1/4 x 7 UNC Alloy Tool Steel Round Die : Amazon.ca: Tools & Home Improvement