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.

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.

The maximum safe loads are the MSS SP-58 carbon-steel threaded-rod values, published across the standard and every hanger catalog; the selection is a simple table lookup.

Estimate. AHJ and licensed professional govern.

Field names used by the API: load_lb, temp_derate, rod_dia, utilization_pct

• Rod loads MSS SP-58 carbon-steel threaded-rod maximum safe loads at or below 650FMSS SP-58
• Temperature derate above 650F apply the standard's derate curve; the default 1.0 is the at-ambient valueMSS SP-58
• Exceeds table a load above the largest tabulated rod (1-1/2 in) after derate returns an engineer-the-support errorMSS SP-58