Stub ACME Thread Mill - Internal
The Stub ACME Internal Thread Mill is built for precision machining of shallow-profile internal threads in thin-walled or space-constrained components. Crafted from solid carbide for maximum rigidity and stability, this tool ensures excellent accuracy and surface finish. It supports single start threads and is compatible with 2G and 3G fit-class specifications. An optional AlTiN+ coating is available to boost performance, extend tool life, and allow for higher cutting speeds—making it a versatile solution for demanding threading applications.
| Thread/Pitch | A (Tool Diameter) | B (Length of Cut) | C (Neck Diameter) | Q (Length) | S (Shank Diameter) | OAL | Flutes | Uncoated Tool # | Uncoated EDP # | AlTiN+ EDP # |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/4-16 | 0.170 | 0.350 | 0.080 | 0.022 | 0.250 | 2.50 | 4 | SPTM170SA-16 | 120501 | 120525 |
| 1/4-16 | 0.170 | 0.500 | 0.080 | 0.022 | 0.250 | 2.50 | 4 | SPTM170SA-16L | 120504 | 120528 |
| 5/16-14 | 0.200 | 0.500 | 0.105 | 0.024 | 0.250 | 2.50 | 4 | SPTM200SA-14 | 120507 | 120531 |
| 5/16-14 | 0.200 | 0.750 | 0.105 | 0.024 | 0.250 | 2.50 | 4 | SPTM200SA-14L | 120510 | 120534 |
| 3/8-12, 7/16-12 | 0.235 | 0.600 | 0.130 | 0.028 | 0.250 | 2.50 | 4 | SPTM235SA-12 | 120513 | 120537 |
| 3/8-12, 7/16-12 | 0.235 | 0.900 | 0.130 | 0.028 | 0.250 | 2.50 | 4 | SPTM235SA-12L | 120516 | 120540 |
| 1/2-10 | 0.320 | 0.750 | 0.170 | 0.036 | 0.375 | 3.00 | 4 | SPTM320SA-10 | 120549 | 120558 |
| 1/2-10 | 0.320 | 1.200 | 0.170 | 0.036 | 0.375 | 3.00 | 4 | SPTM320SA-10L | 120552 | 120561 |
| 5/8-8 | 0.400 | 0.800 | 0.230 | 0.043 | 0.500 | 3.50 | 4 | SPTM400SA-8 | 120567 | 120585 |
| 5/8-8 | 0.400 | 1.300 | 0.230 | 0.043 | 0.500 | 3.50 | 4 | SPTM400SA-8L | 120570 | 120588 |
| 3/4-6, 7/8-6 | 0.490 | 0.800 | 0.260 | 0.058 | 0.500 | 3.50 | 4 | SPTM490SA-6 | 120573 | 120591 |
| 3/4-6, 7/8-6 | 0.490 | 1.300 | 0.260 | 0.058 | 0.500 | 3.50 | 4 | SPTM490SA-6L | 120576 | 120594 |
| 1-5 to 1 1/4-5 | 0.620 | 1.250 | 0.350 | 0.071 | 0.625 | 4.00 | 5 | SPTM620SA-5 | 120603 | 120612 |
| 1-5 to 1 1/4-5 | 0.620 | 1.750 | 0.350 | 0.071 | 0.625 | 4.00 | 5 | SPTM620SA-5L | 120606 | 120615 |
| 1 3/8-4 to 1 3/4-4 | 0.745 | 1.500 | 0.425 | 0.088 | 0.750 | 5.00 | 5 | SPTM745SA-4 | 120621 | 120633 |
| 1 3/8-4 to 1 3/4-4 | 0.745 | 2.500 | 0.425 | 0.088 | 0.750 | 5.00 | 5 | SPTM745SA-4L | 120627 | 120639 |