Three questions machine shops send us most often: which screw holds this insert, which Torx wrench turns it, and which cutter body takes it. These reference pages answer all three from the code stamped on the part, without a phone call.
Use when you have: an insert model, a screw thread, or a wrench size.
Mounting-hole diameter, screw thread and length, and the Torx size for the 11 mm, 16 mm and 1204 insert classes. Type the insert or the screw and get the matching hardware.
Open the screw referenceUse when you have: a body designation such as BAP400R-50-22-4T.
Decodes the body code into cutter type, insert class, screw, wrench and arbor bore. Covers the BAP300R, BAP400R, KM12 and E90AP families, and works in reverse from the insert model.
Open the body referenceMost ordering mistakes happen at a hand-off between two of these columns. Find the insert class on the left and read across.
| Insert class | Typical inserts | Mounting hole | Screw | Torx wrench | Cutter body | Arbor / mount |
|---|---|---|---|---|---|---|
| 11 mm class | APKT11T3, APKT1135, APMT1135 | 2.80 mm | M2.5 x 0.45, 6 mm long | T8 | BAP300R series, E90AP style end mills | 16, 20 or 25 mm straight shank |
| 16 mm class | APKT1604, APMT1604, APMT1604PDER | 4.50 mm | M4 x 0.7, 8 or 9 mm long | T15 | BAP400R series | 22 mm bore (50 / 63 mm bodies), 25.4 mm (80 mm body) |
| 1204 square | SEHT1204, SEKT1204 | not published | confirm with body | T20 (confirm) | KM12 45 degree face mill bodies | 22 mm or 27 mm bore depending on diameter |
Screw sizes are cross-checked two ways: against the mounting-hole diameter of each insert class, and against the hardware currently sold for those classes. The 11 mm and 16 mm rows agree on both.
Screws, Torx keys and inserts in these classes are stocked in our shop. If you need a quantity that is not listed, or you are not certain which class your body is, send us the body designation and we will confirm the insert, screw and wrench before you commit.