Thread Database

Major diameter, pitch, minor diameters, TPI and tap drill size for all 82 thread designations in the database.

Thread systems

3 systems · 82 designations
METRICISO Metric screw thread37 sizesflank 60°UNCUnified National Coarse25 sizesflank 60°UNFUnified National Fine20 sizesflank 60°

All designationsgrouped by system

METRIC60° flank
M1.6 × 0.35M2 × 0.4M2.5 × 0.45M3 × 0.5M3.5 × 0.6M4 × 0.7M5 × 0.8M6 × 1M7 × 1M8 × 1.25M10 × 1.5M12 × 1.75M14 × 2M16 × 2M18 × 2.5M20 × 2.5M22 × 2.5M24 × 3M27 × 3M30 × 3.5M33 × 3.5M36 × 4M42 × 4.5M48 × 5M56 × 5.5M64 × 6M8 × 1 fineM10 × 1 fineM10 × 1.25 fineM12 × 1.25 fineM12 × 1.5 fineM14 × 1.5 fineM16 × 1.5 fineM18 × 1.5 fineM20 × 1.5 fineM24 × 2 fineM30 × 2 fine
UNC60° flank
#1-64 UNC#2-56 UNC#3-48 UNC#4-40 UNC#5-40 UNC#6-32 UNC#8-32 UNC#10-24 UNC#12-24 UNC1/4-20 UNC5/16-18 UNC3/8-16 UNC7/16-14 UNC1/2-13 UNC9/16-12 UNC5/8-11 UNC3/4-10 UNC7/8-9 UNC1-8 UNC1-1/8-7 UNC1-1/4-7 UNC1-3/8-6 UNC1-1/2-6 UNC1-3/4-5 UNC2-4-1/2 UNC
UNF60° flank
#0-80 UNF#2-64 UNF#4-48 UNF#5-44 UNF#6-40 UNF#8-36 UNF#10-32 UNF#12-28 UNF1/4-28 UNF5/16-24 UNF3/8-24 UNF7/16-20 UNF1/2-20 UNF9/16-18 UNF5/8-18 UNF3/4-16 UNF7/8-14 UNF1-12 UNF1-1/8-12 UNF1-1/4-12 UNF