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Six different tanks for blackening? I only counted 4.

The discussion is oversimplified as it does not deal with typical protective coating processes such as anodizing for aluminum; ozide treatments for brass; passivation for stainless steels; conversion coatings (phosphate and oil), or mechanical plating, or galvanizing and electroplating of zinc, cadmium, nickel, and copper-nickel-chrome for steels.

Based on all of the above I started the following discussion which might be of interest to those here: Wikipedia_talk:WikiProject_Metalworking#Heading_.28metalworking.29_and_upsetting.

This article was the subject of an educational assignment supported by Wikipedia Ambassadors through the India Education Program.

The above message was substituted from {{IEP assignment}} by PrimeBOT (talk) on 20:10, 1 February 2023 (UTC)Reply

A lot of the basic information is not sourced... CA148 (talk) 02:07, 9 October 2023 (UTC)Reply

Before Tiny Particle edit:

 The screw has a head on one end that requires it to be turned with a tool. 

After Tiny Particle edit on 19:10, 18 February 2024:

 The screw head on one end has a milled slot that commonly requires a tool to transfer the twisting force. 

Tiny Particle's edit is wrong:

1. It is doubtful that the head of a modern screw is made with a milling process. Originally, the slot in a slotted screw was made with a file. Today most screw heads are probably made with a broaching process. Regardless, how the screw head is formed has nothing to do with the definition of a screw so it is not appropriate to describe a technique for forming a screw head at this point in the article.

2. There are a vast array of screw head types. Tiny Particle's edit implies that all screws have slotted heads. That is obviously wrong. Davefoc (talk) 02:11, 8 June 2024 (UTC)Reply

Quoted from Mechanical classifications section:

  "The "USSR type" refers to the standard thread type used in the Soviet Union, primarily the 40/4 thread. This thread type is commonly found on components like the filtering-absorbing boxes of gas masks, as well as on bolts, screws, and nuts. The 40/4 thread is a metric thread system, and 40mm is the diameter of the bolt or screw and 4 is the thread pitch, meaning it has 4 threads per millimeter."

Firstly, this paragraph does not seem substantiated by the provided sources. This paragraph describes a moderately large bolt with a vanishingly fine pitch that the cited source does not back up. The other source is an auction page which I believe violates some Wikipedia policy but I am not sure. Secondly does not align with the rest of the section "Mechanical classification" which is primarily devoted to recognized standards, which this paragraph does not refer to. Further I would recommend that this paragraph be removed. F123456798 (talk) 03:07, 8 June 2025 (UTC)Reply