M2 screws are typically used in the manufacture of small items of electrical equipment, laptops, cameras and mobile phones. The “M” designation for metric screws indicates the outer diameter of the screw in millimetres, so for an M2 screw, the outer diameter is 2mm. However, in practice the actual diameter might be between 1.9mm-2mm due to manufacturing tolerances.

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.

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:

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.

MetricthreadChart PDF

Available now at Fastenright, Pin TX Button Head Captive Screws feature a security drive for additional protection and are typically supplied with captive washers to create a self-retaining fastener. Find out more information here.

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

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StandardThreadSize Chart PDF

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.

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We stock a range of M2 screws with different specifications, head styles and sizes, as you can see below. We also make special sizes to order.

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.

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.

+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.

Metric fineThreadChart

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.

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.

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Metricthreadpitch chart

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.

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.

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.

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.

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.

M2 screws are available in a wide range of materials including steel, stainless steel, brass, nylon, aluminium and titanium as well as exotic materials including Duplex, Super Duplex and Inconel.

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:

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?$smthumb$

Standardthreadpitch chart

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.

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.

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).

ISO standard metricthreadChart PDF

Each screw size is described using two numbers – the ‘M’ number and a number indicating the length of the shank, in mm, so M2 screw dimensions of M2 x8, are 8mm long, measured under the screw head.

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.

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.

Metric screw size Chart

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.

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.

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,

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.

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