Minimum Hanger Rod Diameter from Load (MSS SP-58)
The smallest carbon-steel threaded rod whose MSS SP-58 maximum safe load (at or below 650F) clears the per-hanger load after the temperature derate, with the utilization (228 lb -> 3/8 in at 37%). The single lookup that decides the rod stock on the truck. Above 650F apply the standard's derate; the engineer of record and the standard's current edition govern the final selection.
Formula and source
rated(d) = MSS_SP58_table[d] x temp_derate; required_rod = smallest d such that rated(d) >= load_lb; utilization = load_lb / rated(required_rod) x 100. Table: 3/8 in 610 | 1/2 in 1130 | 5/8 in 1810 | 3/4 in 2710 | 7/8 in 3770 | 1 in 4960 | 1-1/8 in 6230 | 1-1/4 in 8000 | 1-3/8 in 9510 | 1-1/2 in 11630 lb.
MSS SP-58 carbon-steel threaded-rod maximum safe loads (at or below 650F), by name; the rod-selection logic is first-principles. The values are the standard's published carbon-steel allowable loads.
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