
Basic L ℓ ℓn ℓs Ds K ℓk No. of
Size Class Code Chamfer major dia flutes Type Stock
(mm) (mm) (mm) (mm) (mm) (mm) (mm)
(mm) STI M12 1.75 ◎
1b TW012P1LEBA 1.5P 14.273 95 26 - 48 12.5 10 13 4 3
STI M12 1.5 1b 13.948 88 26 - 45 10.5 8 11 4 3 △
TW012O1LEBA 1.5P
STI M12 1.25 1b 13.624 88 26 - 45 10.5 8 11 4 3 △
TW012N1LEBA 1.5P
STI M14 2 1b 16.598 100 33 - 51 14 11 14 4 3 △
TW014Q1LEBA 1.5P
STI M14 1.5 1b 15.948 95 26 - 48 12.5 10 13 4 3 △
TW014O1LEBA 1.5P
STI M16 2 1b 18.598 105 33 - 50 15 12 15 4 4 ○
TW016Q1LEBA 1.5P
STI M16 1.5 1b 17.948 100 33 - 51 14 11 14 4 3 △
TW016O1LEBA 1.5P
STI M18 2.5 1b 21.248 115 33 - 55 17 13 16 4 4 △
TW018R1LEBA 1.5P
STI M18 1.5 1b 19.948 105 33 - 50 15 12 15 4 4 △
TW018O1LEBA 1.5P
STI M20 2.5 1b 23.248 120 39 - 55 19 15 18 4 4 ○
TW020R1LEBA 1.5P
STI M20 1.5 1b 21.948 115 33 - 55 17 13 16 4 4 △
TW020O1LEBA 1.5P
STI M22 2.5 1b 25.248 125 39 - 58 19 15 18 4 4 △
TW022R1LEBA 1.5P
STI M22 1.5 1b 23.948 120 39 - 55 19 15 18 4 4 △
TW022O1LEBA 1.5P
STI M24 3 1b 27.897 135 46 - 62 23 17 20 4 4 ○
TW024S1LEBA 1.5P
STI M24 1.5 1b 25.948 130 39 - 60 20 15 18 4 4 △
TW024O1LEBA 1.5P For Helical Coil Wire Screw Thread Inserts, for Unified Threads
Basic L ℓ ℓn ℓs Ds K ℓk No. of
Size Class Code Chamfer major dia flutes Type Stock
(mm) (mm) (mm) (mm) (mm) (mm) (mm)
(mm) TWUN4H1LEB5 5P
STI No.4-40UNC 1b 3.670 52 11 17 29 5 4 7 3 2 △
TWUN4H1LEBA 1.5P TWUN4F1LEB5 5P
STI No.4-48UNF 1b 3.532 52 11 17 29 5 4 7 3 2 △
TWUN4F1LEBA 1.5P TWUN5H1LEB5 5P
STI No.5-40UNC 1b 4.000 52 11 17 29 5 4 7 3 2 △
TWUN5H1LEBA 1.5P TWUN6J1LEB5 5P
STI No.6-32UNC 1b 4.536 60 13 22 33 5.5 4.5 7 3 2 △
TWUN6J1LEBA 1.5P TWUN6H1LEB5 5P
STI No.6-40UNF 1b 4.330 60 13 22 33 5.5 4.5 7 3 2 △
TWUN6H1LEBA 1.5P TWUN8J1LEB5 5P
STI No.8-32UNC 1b 5.197 62 15 26 33 6 4.5 7 4 2 △
TWUN8J1LEBA 1.5P TWUN8I1LEB5 5P
STI No.8-36UNF 1b 5.083 62 9.5 26 33 6 4.5 7 4 1 △
TWUN8I1LEBA 1.5P TWUNAM1LEB5 5P
STI No.10-24UNC 1b 6.200 62 15 26 33 6 4.5 7 4 2 △
TWUNAM1LEBA 1.5P TWUNAJ1LEB5 5P
STI No.10-32UNF 1b 5.857 62 15 26 33 6 4.5 7 4 2 △
TWUNAJ1LEBA 1.5P