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Coating bolts and hardware

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Scratch View Drop Down
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    Posted: 15 Mar. 2022 at 11:40pm
I have some hardware that I'd like to "blacken" and I'm wondering what you all do for that. I've heard some use cold blue but I've heard that's not rust preventative once the oil gets washed off.

I've also heard of Hot bluing in oil but I'm not sure I want to subject my hardened bolts to that kind of heat.  I've heard some people say 300-400, and others say around 550 degrees.

I've head of Caswell Black Oxide, but that also needs to be oiled and I'm wondering if that will rust once the WD-40 is washed off.  I've sent them a message asking about it. 
Edit: They replied back and said that they would need to be coated in clear coat to keep them from rusting.  I"m trying to keep away from doing any sort of painting.

What are some other options for "blackening" the metal?  This would be on sandblasted metal.

Fleet Farm sells bulk grade 8 bolts in gold, and grade 5 bolts in black (not fine threaded) what do they use for that?


Edited by Scratch - 16 Mar. 2022 at 12:26pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steelyard Blues Quote  Post ReplyReply Direct Link To This Post Posted: 16 Mar. 2022 at 2:05pm
I have restored two vehicles from the ground up. After I got them all in pieces, I send everything off to be refinished. They clean and strip off any old coating. I do either silver or black cadmium. Someday, the 2A will get the same treatment. 


Micah
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Post Options Post Options   Thanks (0) Thanks(0)   Quote duffer Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar. 2022 at 9:18pm
Originally posted by Scratch Scratch wrote:

Fleet Farm sells bulk grade 8 bolts in gold, and grade 5 bolts in black (not fine threaded) what do they use for that?

The "gold" doesn't last long either.  McMaster-Carr has black "ultra corrosion resistant coated" grade 5 but I have no experience with them.

I suspect you can get high strength stainless (180k psi) in black someplace but I haven't looked.
1955 3B: 441sbc,AGE 4 speed transmission, Teralow D18w/Warn OD, 4.11:1 D44's/ARB's, glass tub & fenders, aluminum hood/grill, 8274, York OBA, Premier Power Welder; 67 CJ5: 225,T86AA, D18, 4.88's, OD
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scratch Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar. 2022 at 10:35pm
I decided to go with the black oxide system.  We'll see how it works.
43 GPW 93487 Blk
44 GPW 230283 OD
46 CJ2A 50100 Tan
46 CJ2A 77632 Wht
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Reconnoiter Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar. 2022 at 7:20am
I have used Kg Industries Gun-Kote 2400 series to great effect on many fasteners.  Parkerizing is also another option on some fasteners. Both coatings hold up quite well to corrosion/wear.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scratch Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar. 2022 at 10:09am
Originally posted by Reconnoiter Reconnoiter wrote:

I have used Kg Industries Gun-Kote 2400 series to great effect on many fasteners.  Parkerizing is also another option on some fasteners. Both coatings hold up quite well to corrosion/wear.

How does that stuff work on threads?  I would think it is a material that adds thickness to the steel making it hard to turn on the threads, and easier to come off there.
43 GPW 93487 Blk
44 GPW 230283 OD
46 CJ2A 50100 Tan
46 CJ2A 77632 Wht
47 CJ2A 141681 Grn
48 CJ2A 156240 Red/Yel
48 CJ2A "Lefty" 181341 Red
61 CJ5 123120 Tan
03 TJ Inca Gld
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Reconnoiter Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar. 2022 at 11:43am
Goes on very very thin (with airbrush) and after baked is very durable, does not interfere with the threads at all, of course the threads will show wear with use as any coating/plating will.

Technical data sheet indicates dry film thickness between 10 and 18 microns…..no problem!






Edited by Reconnoiter - 24 Mar. 2022 at 2:27pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cpt logger Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar. 2022 at 8:07pm
IME, Parkerizing has almost no effect on threads. My friend used to Parkerize reground camshafts on his back yard barbecue. The internal threads for the camshaft gear was unaffected. We built a vat for this purpose after he was sure of his process.
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