Overall Chamfer+ Thread Thread+Neck Shank Shank Size of Length of length full thread length length length dia. square square L ℓt ℓ ℓn ℓs Ds K ℓk SP OX Spiral Fluted Taps, Oxided Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type Stock (for blind hole) Spiral Fluted Taps (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes No.10-24UNC P2 SPQUNAMX 2.5P 60 13 22 33 5.5 4.5 7 3 3 △ No.10-32UNF P2 SPQUNAJX 2.5P 60 13 22 33 5.5 4.5 7 3 3 △ 1/4-20UNC P2 SPQU04NX 2.5P 62 15 26 33 6 4.5 7 3 3 △ 1/4-28UNF P2 SPQU04KX 2.5P 62 15 26 33 6 4.5 7 3 3 △ (for through hole) Spiral Fluted Taps 5/16-18UNC P2 SPQU05OX 2.5P 70 19 - 36 6.2 5 8 3 5 △ 5/16-24UNF P2 SPQU05MX 2.5P 70 19 - 36 6.2 5 8 3 5 △ 3/8-16UNC P2 SPQU06PX 2.5P 75 23 - 38 7 5.5 8 3 5 △ 3/8-24UNF P2 SPQU06MX 2.5P 75 23 - 38 7 5.5 8 3 5 △ (for through hole) Spiral Pointed Taps 7/16-14UNC P3 SPRU07QX 2.5P 82 26 - 42 8.5 6.5 9 3 5 △ 7/16-20UNF P2 SPQU07NX 2.5P 82 26 - 42 8.5 6.5 9 3 5 △ 1/2-13UNC P3 SPRU08RX 2.5P 88 26 - 45 10.5 8 11 3 5 △ 1/2-20UNF P2 SPQU08NX 2.5P 88 26 - 45 10.5 8 11 3 5 △ 5/8-11UNC P3 SPRU10UX 2.5P 95 26 - 48 12.5 10 13 3 5 △ Hand Taps 5/8-18UNF P2 SPQU10OX 2.5P 95 26 - 48 12.5 10 13 3 5 △ 3/4-10UNC P3 SPRU12VX 2.5P 105 33 - 50 15 12 15 4 6 △ 3/4-16UNF P3 SPRU12PX 2.5P 105 33 - 50 15 12 15 4 6 △ 7/8-9UNC P3 SPRU14WX 2.5P 115 33 - 55 17 13 16 4 6 △ Carbide Taps Cemented 7/8-14UNF P3 SPRU14QX 2.5P 115 33 - 55 17 13 16 4 6 △ 1 -8UNC P3 SPRU16XX 2.5P 125 39 - 58 19 15 18 4 6 △ 1 -12UNF P3 SPRU16SX 2.5P 125 39 - 58 19 15 18 4 6 △ For Whitworth Threads Roll Taps Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type Stock (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes 3/16W24 P2 SPQW03MX 2.5P 60 13 21 33 5.5 4.5 7 3 3 △ 1/4W20 P2 SPQW04NX 2.5P 62 15 26 33 6 4.5 7 3 3 △ 5/16W18 P2 SPQW05OX 2.5P 70 19 - 36 6.2 5 8 3 5 △ Simple Inspection Tools Special Thread Taps 3/8W16 P2 SPQW06PX 2.5P 75 23 - 38 7 5.5 8 3 5 △ 7/16W14 P3 SPRW07QX 2.5P 82 26 - 42 8.5 6.5 9 3 5 △ 1/2W12 P3 SPRW08SX 2.5P 88 26 - 45 10.5 8 11 3 5 △ 5/8W11 P3 SPRW10UX 2.5P 95 26 - 48 12.5 10 13 3 5 △ Pipe Taps 3/4W10 P3 SPRW12VX 2.5P 105 33 - 50 15 12 15 4 6 △ 7/8W9 P3 SPRW14WX 2.5P 115 33 - 55 17 13 16 4 6 △ 1 W8 P3 SPRW16XX 2.5P 125 39 - 58 19 15 18 4 6 △ Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order SP-18 For improvement, spec may change without advance notice. 335