Short answer: 17-4 PH in H900 condition.
The aging condition must be stated on the purchase order. A supplier receiving an order for “17-4 PH rod ends” without a condition designation typically machines from Condition A bar stock and delivers parts at 316-equivalent strength. This is the most common procurement error in 17-4 PH rod end sourcing and it is invisible on visual inspection.
Where H900 introduces risk
H900 delivers peak strength but also peak susceptibility to stress corrosion cracking (SCC) in chloride environments. Rod ends have crevice geometry at the ball-housing interface and thread roots — both are SCC-favorable sites under tensile stress. For marine or food processing applications, specify H1025 or H1075: you trade roughly 15% of peak yield strength for substantially better SCC resistance. The H1025 yield strength of ~1,000 MPa is more than adequate for all but the most extreme load cases.
What 17-4 PH cannot do
17-4 PH is martensitic and magnetic after aging. For rod ends in MRI-adjacent equipment or magnetically sensitive systems, it is disqualifying. 316 in annealed condition is the correct grade where magnetic permeability is constrained.
If strength is the driver, specify 17-4 PH and state the aging condition explicitly. H1025 is the right condition for most demanding applications involving any chloride exposure.
