Below are examples of tooling that have what I think is a grey phosphate finish to their non ground surfaces.

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The arbor on the left is a 2 Morse adaptor for which I made a drawbar coupling from 4140. To replicate ( or come close to replicating ) the original grey, I applied Rust-Off to the coupling, initially by immersion followed by application with some paper towel dampened with the Rust-Off.

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BobL suggested using Rust-Off as a rust converter a couple of years ago because of its 62.5% phosphoric acid content. It is available from Bunnings. The container on the left shows the current label.

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So far I have only applied the Rust-Off to 4140. The example below is a "drawbar" for P20 collets. Behind it is a bar end of precision ground 4140 for comparison.

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And on a slightly smaller scale, an M4 threaded replacement thumbscrew for my daughter's piercing saw. She broke the screw last night. She lives in Melbourne. We both have the same saw.

Before and after the Rust-Off with an original screw on the left -

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I am yet to try "phosphating" the ever so keen to corrode 1214. Next experiment unless Bob beats me to it.

BT
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