Overall lengthChamfer+ full threadThread lengthThread leng+Neck thShank lengthShank dia.Size of squareLength of square
SP Spiral Fluted TapsLℓtℓℓnℓsDsKℓk
SizeClassCodeChamferL (mm)ℓ (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)No. of flutesTypeStock
1/2W12P3SPRW08S2.5P8826-4510.581135○
9/16W12P3SPRW09S2.5P9526-4812.5101335△
5/8W11P3SPRW10U2.5P9526-4812.5101335○
3/4W10P3SPRW12V2.5P10533-5015121547○
7/8W9P3SPRW14W2.5P11533-5517131647○
1 W8P3SPRW16X2.5P12539-5819151847○
1 1/8W7P4SPSW18Y2.5P13546-6223172047△
1 1/4W7P4SPMSW20Y2.5P14546-6724192247△
1 3/8W6P4SPMSW22Z2.5P15552-7128212447△
1 1/2W6P4SPMSW24Z2.5P16552-7630232647△
1 5/8W5P4SPMSW2602.5P17559-8132263047△
1 3/4W5P4SPMSW2802.5P18059-8335263047△
For Screw Threadsused on Sewing Machines
SizeClassCodeChamferL (mm)ℓ (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)No. of flutesTypeStock
3/32SM56P1SPPS06E2.5P468.1142932.5523△
1/8SM40P1SPPS08H2.5P5211162954733△
1/8SM44P1SPPS08G2.5P5211162954733○
9/64SM40P1SPPS09H2.5P5211172954733○
11/64SM40P1SPPS11H2.5P601321335.54.5733○
3/16SM28P2SPQS12K2.5P601321335.54.5733△
3/16SM32P2SPQS12J2.5P601321335.54.5733△
7/32SM32P2SPQS14J2.5P6215263364.5733△
15/64SM28P2SPQS15K2.5P6215263364.5733△
1/4SM24P2SPQS16M2.5P6215263364.5733△
1/4SM40P1SPPS16H2.5P628.6263364.5734△