Methodology guide
PSI ladder and safety notes.
Calculator
Grease gun PSI calculator
Enter required pressure in PSI. Get the smallest 6k, 8k, or 10k class or NO_MATCH.
Result
Match needed_psi to the smallest class whose published max covers it: 6000 · 8000 · 10000 PSI. Worked check: 4500 → 6000 PSI class.
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