ISO insert format

SDMT inserts

Square milling insert. We make 11 SDMT sizes, from SDMT09T308 to SDMT150512. Grade, coating and chipbreaker are matched to your material and operation.

SDMT120408: illustration of a square insertSDMT120408
Illustration drawn from the designation, not to scale. Colour depends on the coating.
Reading the code

What SDMT means

The first four letters of an ISO 1832 designation give the shape, the clearance angle, the tolerance class, and the hole and chipbreaker.

CodeFeatureMeaning
SShapeSquare
DClearance angle15° (positive insert)
MTolerance classClass M
THole and chipbreakerHole countersunk on one side, chipbreaker on one face

Where SDMT inserts are used

Square milling inserts are used mainly in face milling cutters.

SDMT is a positive (15° clearance) square milling insert. It has a countersunk hole for a clamping screw. The chipbreaker is on one face only. The positive geometry keeps the cutting forces down.

Use the insert format, size and corner configuration specified by the cutter manufacturer; check the pocket and clamping system before ordering.

Questions

What does SDMT mean?
It is an ISO 1832 code. S = Shape: Square; D = Clearance angle: 15° (positive insert); M = Tolerance class: Class M; T = Hole and chipbreaker: Hole countersunk on one side, chipbreaker on one face.
Which SDMT sizes do you make?
11 sizes, from SDMT09T308 to SDMT150512. Grade, coating and chipbreaker are confirmed with each quotation.
How do I read SDMT120408?
SDMT = format; 12 = Cutting edge length code (about 12 mm); 08 = Corner (0.8 mm nominal).

Related formats

Guides: ISO material groups · Inserts for stainless steel

Application enquiry

Start with the details you already have.

Tell us about the material, feature and current challenge. Your enquiry is saved securely and sent to our team for follow-up.

  • No account required
  • Your enquiry is saved for follow-up
  • Our team receives an email notification

By submitting, you agree that ORTON may use these details to respond to this enquiry. Privacy