Custom manufacturing falls in Class 40, manufacturing & processing, and depending on what exactly you sell it can also fall in Class 1 or Class 17. Everything below is read from the USPTO's own list of accepted descriptions, not from an opinion about where it belongs.
Searching the USPTO Trademark ID Manual for custom manufacturing returns 108 accepted descriptions, and most of them sit in Class 40. The manual is the list of identifications the office has already approved, so wording taken from it is pre-approved and settles the class at the same time.
The class follows from the identification you write, so "what class am I in" is really "what exactly do you sell". How the class system works covers the rest.
You treat, process, or custom-make materials and goods for others.
106 accepted descriptions in the manual mention custom manufacturing. For example:
Raw chemicals, adhesives, or additives used in industry, science, farming, or manufacturing.
1 accepted description in the manual mention custom manufacturing. For example:
Rubber, semi-finished plastics, insulation, hoses, or sealing materials.
1 accepted description in the manual mention custom manufacturing. For example:
Custom manufacturing appears in 3 classes because what you make, what it is made of and the service of selling it are separate classes. Pick the descriptions above that match what you actually do.
Custom manufacturing is a service, so it sits in Classes 35 to 45. Software that delivers a service is often Class 9 or Class 42 as well.
Treating materials and making things to order for other people: custom manufacture and printing services are here. It is a service class, so it does not cover goods you make to sell under your own name.
The class decides what a registration covers; it does not decide whether the name is available. Relatedness is judged on the identifications, so a conflict can sit in a class you never looked at: the same name in a different industry.
Check whether your name is clear for custom manufacturing Searches the live USPTO register, including sound-alike and meaning-alike names. First search $2, then $5.Custom manufacturing sits in Class 40, manufacturing & processing. That is where the USPTO's own ID Manual puts it: 106 accepted descriptions mentioning custom manufacturing fall in Class 40. Depending on exactly what you sell it can also fall in Class 1 or Class 17.
You file in every class you actually use the mark in, and the USPTO charges its fee per class. Selling a product and also running an online store for it is two classes, not one. Filing in classes you do not use is worse than filing in too few: an application has to be supported by real use or a genuine intent to use.
No. The class decides what a registration covers. Availability turns on whether someone already holds a similar mark for related goods, and relatedness is judged on what the identifications say rather than on the class number, so marks in different classes can still conflict.
Not what you sell? Search the class finder for your own wording, or browse all 45 classes.