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Re: [Shop-talk] Safety Wire Drill Guide

To: Mark Andy <>
Subject: Re: [Shop-talk] Safety Wire Drill Guide
From: Jim Juhas <>
Date: Tue, 5 Feb 2013 20:50:56 -0500
Cc: Shop Talk <>
References: <SNT127-W29D0083EC6F5E7CCC87CAF9A010@phx.gbl> <> <SNT127-W201276AAC6D324850C5DE9A000@phx.gbl> <>
I originally posted this question. While the jig presumably can be used on
bolt heads, my interest was for locking nuts, not bolt heads, with safety
wire. The applications for this include locking the nuts on an external oil
pump where the cover is mounted over studs, generally light torque situations.
Another method I have used is a castled nut and a hole through the end of the
thread on a bolt, but that's not always feasible on the end of a stud.

Sent via iPad
Jim Juhas

On Feb 5, 2013, at 9:49 AM, Mark Andy <> wrote:

> Howdy,
> As to "why?" I'm guessing its "don't have to drill as much".  Going
> through a corner of a bolt head seems like it'd be a heck of a lot
> less material to remove.
> As for how to actually drill it... I would think it'd be pretty
> sensitive to what drills you were using and what feed rates.  Seems
> like since you're catching the corner on an angle, it would be pretty
> easy to overfeed it, causing the drill to take too much of a bite and
> snap.  Is that what's happening, or is it something else?  Might have
> a similar problem coming out, but the bit should be even better
> supported there.
> All that said... I've always done like someone else posted and drilled
> straight through, flat to flat.  And I've broken off my share of bits
> doing it, particularly when I've done it using a hand drill.
> Mark
> On Mon, Feb 4, 2013 at 9:12 PM, PJ McGarvey <>
>> Nope, I didn't even realize that was something people were doing - and I'm
>> wondering why (though I'm guessing something to do with the strength of
>> bolt head for torquing?).
>> Maybe a thicker drill bit wouldn't have a problem bending and breaking so
>> easily, almost seems like you're asking for trouble by using that guide
>> with such a small bit.
>>> From:
>>> CC:
>>> Date: Mon, 4 Feb 2013 11:02:58 -0800
>>> Subject: Re: [Shop-talk] Safety Wire Drill Guide
>>>> Not sure if there's any secret here.  I've drilled a dozen
>>>> 1/8" safety wire holes in Grade 8 bolts before using a single
>>>> cobalt bit in a drill press, and without the tool you linked
>>>> to -
>>> But did you start on the corner of the bolt head?  That's what the
>> linked-to
>>> tool is designed to do; and it has a guide right next to the bolt head to
>>> hold the drill on-center to the corner.  Seems to me that even a cobalt
>>> is going to grab the corner of the bolt head and bind or break; unless
>>> grind a small flat for the bit to start into.
>>> -- Randall
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