But, to install the step rails, I’ll remove the lower plastic rocker guards and then need to drill 8 holes on BOTH sides of the car (16 in total). I believe the attachment method is nutzerts, however I know it’s been updated a few times in the last couple of years, so we’ll see once they arrive

About $10 cheaper at Grainger if you decide to go with the M A Ford bit. I don’t recall that we ever used this style bit - but did use other MA Ford bits. I think their brad point bits for drilling composites worked well for us.

https://www.grainger.com/product/CLE-LINE-Carbide-Tipped-Die-Drill-Bits-WP8119337/_/N-/Ntt-1~~~4+die+drill?NLSCM=27&optOut=0&sst=subset&s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/1TPE3_AS01?$smthumb$

Even a extra hard M42 or other machinist level drill bit won’t like that job for long. How many holes do you have to drill? say it’s 10, I’d plan on getting 3 bits and hoping I can cleanily make 3 holes per bit and I would put oil on them

I still haven’t decided! There’s a lot of back-and-forth information. Cobalt vs Carbide, etc. I’ll take the plunge sooner or later.

Sign In or provide a ZIP code to view pricing. 4 x 1/4-inch high speed steel drill bit. Standard packaging.

Jun 20, 2023 — Also tungsten carbide tipped center punches exist that can make a starting point in hardened steel to center your drill on. – DKNguyen.

I’ve been doing some research and it sounds like Cobalt is the recommended bit material, preferrably M42 (8% cobalt). However, I’ve talked to a few other guys that have performed this install and some are saying they went through 6-8 cobalt bits drilling the necessary holes.

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MA ford is good stuff but I thought they only make machinist tooling. I’ve never used a bit like that in a hand drill so I won’t say it won’t work but I don’t think it’s made for that.

Find carbide insert for stainless steel at Dohrecnc with M series, finishingsemi finishing and roughing are all available. Contact now and get wholesale ...

Better are drills we use to call Die-Maker’s or Die Drills - but they are better suited if chucked in a magnetic drill press - not a hand drill:

reasoning - body of modern car is often a high boron content - high tensile strength steel - if steel body. Those pinch welds are often multiple layers at a point - pinched together and then melted and hardened. Thus one of the hardest points in the car body.

To be honest, I’m not sure what the installation completely involves. I have a friend that has installed the rock rails on his Cherokee, he’ll be advising / guiding me through the whole thing.

MATERIAL. SPEED. END MILL DIAMETER FEED PER TOOTH (INCHES). (SFM). UP TO 1/4. UP TO 1/2. UP TO 1. ALUMINUM/ALUMINUM ALLOYS. 600 – 1300 .0002-.002.

This drill has a 60° angle design, followed by an 82° angle flare making it a dual-purpose tool. Snap Ring grooves are offered in HSS, standard drill sizes #14 ...

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It’s been so long since I’ve used machinist bits but IIRC they don’t like being in a hand dril. IE not made to spin in something like a cordless ______ hand drill.

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The “Jeep Cherokee KL Super Sliders”, which are under the Step Rail category. I also opted for the cover panels, since other owners have had some issues with mud and things building up behind them.

As far as those other names I know a number of guys in the hangar swear buy those drill hog usa bits - but they do consider them throw away because of cost. But that doesn’t mean you won’t see a guy at the bench grinder re- sharpening one.

The body seam attachment does sort of look to be a threaded insert but I wonder if they don’t have access for you to put the bolt in through the back. Good luck with it - looks rather sturdy.

There are more, “Drill Hog USA 12-Pack” and “Viking Drill and Tool 12-Pack” However my newbie status won’t allow me to post more links.

I picked up these bits, http://www.ebay.com/itm/181925857905. It’s a 12-pack of M42 Cobalt bits. I figured that 12 should be MORE than enough and I’ve heard some pretty great things about Drill Hog bits online.

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I checked out the MSC website, and decided to chat with them to just leverage options. After explaining the material I’m working with, and the goal of 16 holes, they recommended THIS which seems like over-kill.

If the attachment requires nutserts you will want the hole to be pretty spot-on conforming t the nutsert specs. Do you have the tool for setting them - or do you plan on using one of the methods using washers like these:

The step rails I purchased were from Rocky Road Outfitters, they’re essentially the only company making steel step rails that can support the weight of the vehicle. They also offer bull bars that don’t impact approach angle, and some other goodies.

We had good luck with the Cleveland brand. I’d recommend a bit with a 135 degree split point and try to keep the pressure consistent to avoid walking and further work hardening,

+1 on that 135 degree point comment - which BTW helps with the resharpening idea. take your whatever bit and on hole 3 - re square the tip on the bench grinder.

My original plan was to purchase 8-10 standard bits, and just return what I don’t use. However, if this full carbide bit would do the entire job, maybe it’s not a bad idea. But I’m hesitant to put this entire project onto a single drill bit.

I’m looking for a recommendation of a higher quality (brand?) of cobalt bit that will prevent me from needing 6-8 of these. I’m seeing listings on Amazon for Bosch, Irwin, Dewalt, and a few brands I’ve never heard of.

Of brands Irwin hanson is pretty good quality, as is Norseman which is what I’d look for. but I’d give equal look at just getting some common HSS bits in the size I needed and considering them throw aways. Might be cheaper and easier in the long run.

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I purchased some step rails for my Jeep Cherokee, and the installation instructions call for a 1/4" bit to drill through the pinch weld (hardened steel).

How’s the drilling and installation of step rails on your Cherokee? My sister recently acquired a Cherokee as well and looking to get a good step rail. These drilled ones seem to be tougher. I’ll be finishing installing the Smittybilt parts first before working on the rails.

For hardened steel Champion make what they call Locksmith’s drills for drilling into safes. They are carbide tipped and tend to wander cutting holes that sometimes are out of round. I guess this is OK when all you want to do is get a peek inside and access the locking mechanism.