How to prevent screws from loosening: Loctite, Safety Wire, Jam nuts & More Part 1 of 2

[adamcreveling]

so nylock and nylon lock are the same thing?

[saunixcomp]

@adamcreveling Not sure if there's a specific situation you are referring to, but yes, i would guess that nylock is an abbreviated term for nylon lock

[tundragriz]

Instruction concerning torque needs to mention that a torque wrench must be stored at its minimum setting. Stored at minimum the calibration will not change over time. Storing it under tension will alter the springs force over time, it is calibrated from its initial tension. It should be set to specified value, used, and reset to minimum. Should also never be used for loosening, loosening torque tells nothing and can damage the wrench.

[zloben9000]

this is NUTS !

[jHavoc696]

hey im newb at this like i dont know anything about bolts but im suppose to fix something but the nylon locknut doesnt even go in the full screw and the part is always loose how im suppose to tighten it ?

[saunixcomp]

@jHavoc696 Not sure what to tell you.  If it's the correct thread count for the bolt, then the nut should tighten with a wrench.

[Mavermick1]

Thanks for the video. Just a small issue, the castle/castellated nut is actually a slotted nut.

[saunixcomp]

@Mavermick1 Is it? google image would disagree.. What's the difference?

[Mavermick1]

@saunixcomp - Hi. To look at a slotted nut it just a normal hex nut with slots........whereas on a castellated nut, the slotted section is circular. I think the terms are often intentionally combined now, but that is the original definition given to me.

[rkward101]

@saunixcomp I don't think there is a difference, you just don't hear it as often anymore.

[lazystart]

My bad, my lack of experience in posting on facebook is showing. I didn't mean to spam the comments

[mc2racing7emh]

This is undoubtly my favorite youtube channel.

It's worth mentioning two things. First, your aim in tightening fasteners is clamp load. Clamp load is related to torque but a variety of factors come into play as to what clamp load is generated by a given amount of torque (which is why the torque tables have different values depending on fastener finsh, etc.). Second, when designing a bolted joint, you must consider the material being held together by the bolt. Lots to this as well.

[saunixcomp]

@mc2racing7emh Thanks for the info and clarification

[msgmonly]

one good tip for u... always store torque wrenches at their lowest setting

[saunixcomp]

@msgmonly GREAT tip! Thanks!

[lazystart]

@saunixcomp Another good practice is before use, set your torque wrench to the max setting and break the torque 6-10 times. It lubricates the internal components of the wrench and helps prolong the life of your wrench.

[saunixcomp]

@lazystart Would doing the same thing at a lower setting also lubricate the internal components?

[lazystart]

@saunixcomp It would, but by setting it to the highest setting you ensure all of the components of the wrench are taken care of. The components at or below your usual torque setting get used and lubricated much more often than the settings higher than your usual setting.

[lazystart]

@saunixcomp It would, but by setting it to the highest setting you ensure all of the components of the wrench are taken care of.  The components at or below your usual torque setting get used and lubricated much more often than the settings higher than your usual setting.

[lazystart]

@saunixcomp It would, but only the parts of the wrench up to your setting. Going the full range ensures all of the working components of the wrench are exercised and lubed. This is for break-away or "click' style wrenches, many of which on the market today are self-lubricating. However, it only really self-lubricates the parts that it has been set to. This is a practice we have in the Air Force since our torque applications are critical in structural and mechanical components.

[lazystart]

@saunixcomp It would, but only the parts of the wrench up to your setting. Going the full range ensures all of the working components of the wrench are exercised and lubed. This is for break-away or "click' style wrenches, many of which on the market today are self-lubricating. However, it only really self-lubricates the parts that it has been set to. This is a practice we have in the Air Force since our torque applications are critical in structural and mechanical components.

[YoungJim409]

Oh hey also if you want lots of good info on good shop practice for vibration-resistant fastener installations, find a copy of an FAA publication called AC43.13-1A.

[YoungJim409]

You can use extentions just fine, you must simply scale the torque applied down in direct proportion to the increase in length.  For short ones you can put them 90 degrees to the handle and ignore the difference.

[happymark1805]

distorded thread hex nut lock has one big problem, if You use a torque wrench the torque is not correct because the nut also creates a drag.

There are also products like loctite and a nut that has two slits in it(don't know what that is called) .

[happymark1805]

@happymark1805 - forget about the loctite, that is in part 2

[YoungJim409]

@happymark1805 With mechanical self-locking nuts you can measure the drag and add that to the intended torque.

[camochannel1]

good video very informative thanks for posting

[gbowne1]

You forgot star washers, I like castle nuts and either cotter pins and/or lockwire. There are also bolts and screws with holes drilled in either the head or also the threaded portion. Aircraft have special fasteners and I belive there are some marine fasteners.

[TAWPTool]

Yet another excellent video from NYCCNC! Keep up the great work!

I think you may have misspoke, The "N" in NF and NC stands for National, not Normal.

Now stop reading my post and get to work on part two already! lol

[saunixcomp]

@TAWPTool Thx for the correct re: National (not Normal). Part 2 is uploading as we speak!