Overall lengthThread lengthThread+ lengNeck th lShank engthShank dia.Size of squareLength of square
LS-PO Long ShankSpiral Pointed TapsLnℓsDsKℓk
SizeClassCodeChamferL (mm)ℓ (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)No. of flutesTypeStock
7/16-20UNFP3PORU07NL155P15026-508.56.5932
1/2-13UNCP3PORU08RL15 PORU08RL205P150 20026-6010.581132
1/2-20UNFP3PORU08NL15 PORU08NL205P150 20026-6010.581132
5/8-11UNCP3PORU10UL15 PORU10UL205P150 20026-6012.5101332
5/8-18UNFP3PORU10OL15 PORU10OL205P150 20026-6012.5101332
3/4-10UNCP4POSU12VL15 POSU12VL205P150 20033-7015121533
3/4-16UNFP3PORU12PL15 PORU12PL205P150 20033-7015121533
7/8-9UNCP4POSU14WL205P20033-7017131633
7/8-14UNFP3PORU14QL205P20033-7017131633
1 -8UNCP4POSU16XL205P20039-8019151833
1 -12UNFP4POSU16SL205P20039-8019151833
For Whitworth Threads
SizeClassCodeChamferL (mm)ℓ (mm)ℓn (mm)ℓs (mm)Ds (mm)K (mm)ℓk (mm)No. of flutesTypeStock
1/4W20P3PORW04NL10 PORW04NL155P100 15015264064.5731
5/16W18P3PORW05OL10 PORW05OL155P100 15019-506.25832
3/8W16P3PORW06PL10 PORW06PL155P100 15023-5075.5832
7/16W14P3PORW07QL155P15026-508.56.5932
1/2W12P3PORW08SL15 PORW08SL205P150 20026-6010.581132
5/8W11P3PORW10UL15 PORW10UL205P150 20026-6012.5101332
3/4W10P4POSW12VL15 POSW12VL205P150 20033-7015121533
7/8W9P4POSW14WL15 POSW14WL205P150 20033-7017131633
1 W8P4POSW16XL15 POSW16XL205P150 20039-8019151833