[Milsurplus] replacing black oxide screws /with/ blackened zinc plated screws

[jphutch60bj]

Thanks - Tim, Mike

Just cant get cheap, less expensive,  black oxide screws any more.   Mc 
Master Carr did no have the style and length needed. The correct screws 
, length style and size are Zinc plated, from bolt depot, in quantity.

U-tube video where the oil quench and Cold Bluing methods were 
demonstrated and both were effective.

In addition U-tube  video where zinc plated screws are placed in a mild 
Citric-Acid bath for a few hours then Cold Bluing was applied.  I have 
Hot Blued a 30-40 kraig  gun parts using the oven temp set at 370.  Yes 
other half not happy about roasting gun parts in oven.

I was thinking of attempting the mild acid bath followed by modified 
applying Cold Bluing at a temperature of ~350 which is Hot Bluing.

Hutch


On 10/28/2020 6:39 AM, Michael Hanz wrote:
> I have several of the Brownells bluing/blackening products here that I 
> have used for this purpose, Hutch.  One or more may work on one and 
> not on another, depending on the plating process and material.
>
> I wouldn't try just bluing the heads - there may be interactions with 
> the aluminum panel that you won't appreciate.  Just throw the entire 
> screw(s) into a jar with one of the chemicals and see how it works.  I 
> also got a product from Caswell Plating that does a good job on _some_ 
> stainless screws, but again, there are a number of different kinds of 
> stainless steels, and it isn't a cover-all.  You might want to 
> consider just getting new factory blackened screws from 
> McMaster-Carr.  It's what I do if I want to make complete makeover of 
> a set.
>
>       73,
>  - Mike  KC4TOS
>
> On 10/27/2020 9:15 PM, jphutch60bj wrote:
>> Need to replace a few lost black oxide screws with zinc plated 
>> screws.   I really only need to "blacken" the screw heads.
>>
>> To accomplish the task I am thinking of Gun Bluing just the heads of 
>> the zinc plated screws, using a Cold Gun Bluing solution.
>>
>> Anyone gone down this road before that may have some tips or tricks.
>>
>> Thanks for you assistance.
>>
>> Hutch
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