Yes, it is possible to identify a bolt thread without a ruler. You can use a thread gauge, which is a tool specifically designed for measuring threads. If you don't have a thread gauge, you can try using a caliper or a micrometer, which are both tools that can measure small distances. Additionally, you can try using a magnifying glass to get a closer look at the threads and look for any markings or branding that could give you additional information.
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