RA390-038M32-17M end mill from Sandvik AB - square-shoulder control in tight spaces

Reviewed: ad hoc news Bestseller & Flagship desk. Edited and checked on 2026-06-29, 06:49. Details in the imprint.

RA390-038M32-17M from Sandvik AB looks almost modest at first glance, a compact steel body with a ring of inserts that disappears deep into a machining center. When a CNC door closes and the spindle spins up, you hear a clean, steady hum rather than a harsh chatter.

What this cutter is made for

The RA390-038M32-17M is an indexable square-shoulder end mill designed by Sandvik Coromant for milling precise 90-degree shoulders and pockets in steel and other common engineering materials. Its nominal cutting diameter around 1.5 inches keeps it comfortable in mid-size machining centers that fight for every millimeter of clearance.

Each pocket on the tool body takes a replaceable insert, so operators like Anders Johansson, a shop foreman in Gothenburg, can swap worn edges in minutes instead of pulling the whole tool from the setup. That insert concept keeps the cutter ready for long production runs without constant re-measuring of length and diameter after every change.

How it behaves on the machine

The shank on RA390-038M32-17M is built with a Weldon flat, so it locks solidly into side-clamp holders and resists pull-out when feed rates climb. That detail matters when the cutter has to plunge close to fixturing, because any slip marks the workpiece and adds scrap.

In daily use, the tool’s short overhang and balanced insert layout mean the milling head feels surprisingly quiet in the operator’s palm when the spindle is jogging at low speed. Once cutting, the chip flow stays tidy enough that you can watch bright curls slide away from the shoulder instead of packing and welding inside the pocket.

Insert system and flexibility

Because RA390-038M32-17M is part of the broader RA390 family, shops can pair it with a range of insert grades tuned for everything from low-alloy steel to corrosion-resistant materials. That flexibility lets a programmer keep one cutter model in the CAM library while swapping insert codes to match the current job mix.

For production engineers, the square-shoulder geometry means they can rough and finish walls in fewer passes while preserving a clean corner transition. That reduces cycle time and heat input, especially on parts where a deep pocket sits next to a thin web that is prone to distortion.

Pricing and availability

The RA390-038M32-17M typically sits in the high three-digit price band per tool body in North American distribution, reflecting the precision of its insert seats and the hardened steel construction. Inserts themselves add ongoing cost, but each rotation provides fresh cutting edges without buying a new body.

Sandvik sells the cutter primarily through industrial distributors and its own sales organization, with availability focused on machine shops and OEMs in Europe, the United States and Asia. Buyers usually see lead times of only a few days for standard dimensions, which keeps the tool practical for urgent maintenance work and short production runs.

Where RA390-038M32-17M fits in Sandvik’s world

Sandvik AB, headquartered in Sweden, runs its cutting-tool operations under the Sandvik Coromant brand and positions tools like RA390-038M32-17M as standard building blocks for general engineering customers. That segment complements more specialized inserts and custom bodies for automotive and aerospace lines.

Sandvik shares (ISIN SE0000667891) trade on Nasdaq Stockholm, and the performance of staple tools such as RA390-038M32-17M contributes to the steady cash flow that underpins the group’s industrial profile for long-term investors.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.