Kennametal Tooling FAQs: Boring Bars, Insert Nomenclature, and Sourcing Lessons

I'm not an engineer or a machinist. I'm the office administrator who manages tooling purchasing for a 45-person manufacturing shop. I place most of the POs for cutting tools, MRO supplies, and the occasional weird request. In 2024, we spent roughly $180,000 on tooling and related shop supplies—maybe $200,000, I'd have to pull the annual report—and I stayed on top of about 60-80 orders a year.

This FAQ is based on real questions I've gotten from our engineers, finance team, and suppliers. Some are directly about Kennametal. A few are adjacent. One is about a laser treatment that is not related to machining at all, but it keeps showing up in our search analytics, so I'll answer it too.

Are Kennametal boring bars worth the premium?

Most of our internal turning jobs are 4140 and 303 stainless. We use Kennametal boring bars when we need consistent results on blind bores and tight tolerances. Are they worth it? In my experience, yes—at least in our shop. The durability and repeatability have been better than cheaper bars, and a tool failure in the middle of a run costs a lot more than the price difference.

Pricing is all over the place. A standard Kennametal boring bar runs roughly $80–$250 list depending on size, shank style, and carbide grade (based on distributor quotes I saw in early 2025; verify current pricing). I had to approve a rush order of boring bars in about an hour last year. Normally I'd compare quotes, but there was no time. I went with our usual Kennametal distributor because they'd been reliable. It worked out, but I hated making that call without options. That said, I always check the minimum bore diameter and head style before ordering. Boring bar is a category, not a spec. I learned that after ordering the right brand and the wrong geometry.

What does Kennametal turning insert nomenclature look like?

The codes on a Kennametal insert are not random. Take something like CNMG 432-PR 4325. The first letters describe the insert shape and clearance angle; the numbers describe size and thickness; the trailing letters and numbers describe the chipbreaker and carbide grade. The exact ordering can vary by product line, so I don't try to memorize it. According to Kennametal's online catalog (kennametal.com), insert codes follow standard ISO/ANSI designation rules. We laminated a reference chart and taped it to the cabinet next to the ordering terminal.

The question people don't ask enough: which chipbreaker? The grade gets most of the attention, but if the chipbreaker doesn't match your material and feed rate, the insert will chatter, wear too fast, or break. I ordered a large batch of 'standard' turning inserts in 2022 and didn't check the chipbreaker. They had the right grade but the wrong geometry for our roughing pass. The machine ran, but tool life dropped by maybe 30%. If I remember correctly, that was a 2022 order and the inserts were returned. The chat with the distributor was not fun.

Should we standardize everything on Kennametal?

Standardization is good for inventory, but I'd be careful about making it a religion. We standardized on Kennametal for carbide inserts and boring bars because that's where we had the most chatter, breakage, and inconsistency. We did not standardize on drills, taps, or toolholders because there wasn't a strong enough reason to switch. Our shop runs a mix of newer and older machines, and 'one brand fits all' would mean forcing a solution where it doesn't belong.

From a purchasing standpoint, I like having a primary brand with a backup. We manage relationships with 8 vendors, and not every Kennametal product is stocked by every distributor. If the lead time on one size is too long, I need to know whether another source has it. That flexibility matters more when you're processing 80 orders a year and your finance team wants you to keep inventory lean.

Is the '3D printing with Fusion 360 epub' actually relevant to a machine shop?

It surprised me, but yes—kind of. In 2023, one of our engineers wanted to 3D print soft jaws for a fixture. I didn't want to nod along and pretend I knew what he meant, so I looked it up and found the '3D printing with Fusion 360 epub' in a search. I downloaded it to understand the workflow: design in Fusion 360, slice the model, send it to a printer, and iterate quickly.

It's not going to replace metal cutting. But it's useful for prototypes and custom fixturing. That year we printed a one-off set of fixture jaws and saved around $400 in outside machining costs. So glad I read it before that project meeting—I almost went in cold. If you don't want to keep an epub on your work device, Autodesk's free tutorials cover the same ground. The epub is just a more structured read for people like me who like to bookmark pages.

Are laser cutting machine trade shows worth the travel time?

I went to a large North American manufacturing trade show in 2024 because our shop was evaluating a laser cutting machine. If I remember correctly, it was FABTECH, but don't quote me on the exact city. It was overwhelming. There were at least a dozen laser cutting machine vendors with live demos. Every booth wanted a 20-minute conversation, and I wanted to compare cut quality on our typical part thicknesses.

The good part was seeing machines in action and talking to applications engineers without scheduling a sales call. The bad part was that I didn't book vendor meetings in advance, so I spent a lot of time waiting. In hindsight, I should have made a checklist: material, thicknesses, tolerances, floor space, maintenance access, and a specific sample part. If you go to a laser cutting machine trade show, go with a plan. Also, watch how the vendor answers direct questions. If they can't give a straight answer at a booth, the PO phase won't be any better.

What's the most important question to ask before any tooling PO?

It's not what's the price? It's what's NOT included? I learned this in 2021 when a distributor quoted a great price on Kennametal boring bars. The quote didn't mention the minimum order fee, the small-order surcharge, or freight. The final invoice was about 14% higher than the quote. The vendor wasn't trying to trick us—it was buried in terms nobody read. But I couldn't take that surprise to my finance manager and call it a win.

The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.

Now I ask for a line-item breakdown on any order over $500. If a supplier says 'that's just standard,' I see that as a red flag. Quote me the total, or at least tell me what could move. That's the transparency principle that has saved us more money than any single tool discount.

And yes, how painful is CO2 laser resurfacing?

This one is not about machining, but it shows up in our search analytics every month. CO2 laser resurfacing is a medical/cosmetic procedure, not a cutting process. I'm not a medical professional, and I can't speak to the actual pain level—that depends on the provider, the depth of treatment, and your own tolerance. What I can tell you, as someone whose job is comparing costs, is this: the same principle applies as with tooling. Ask for an itemized quote. Ask what's not included. Find out whether aftercare supplies, medication, and follow-up visits are extra.

The pain of a surprise bill is usually worse than the procedure itself. So do the same thing I do before a PO—read the fine print and ask the questions. It won't make the process painless, but it makes it a lot more predictable.

Now, if you'll excuse me, I have to approve a purchase order.