17-4 PH Stud Bolts
The high-strength stainless — up to 190 ksi in H900, or 115 to 135 ksi with real toughness in the H1150 conditions — for pump shafts, valve stems, subsea and aerospace fasteners.
Threaded rod inserted through the holes of mating flanges, paired with heavy hex nuts. Available in every diameter and length, imperial and metric, for flanged connections in critical service. Supplied bare or coated, with full material traceability.
17-4 PH is a chromium-nickel-copper martensitic stainless steel that is hardened by a simple low-temperature age rather than a quench. Solution treated at 1900 °F it machines readily at about 35 HRC; a single 900 °F age then takes it to 190 ksi tensile and 40 HRC, or a 1150 °F age trades strength for ductility and impact toughness. Corrosion resistance is close to 304 in most atmospheres, short of 316 in chlorides.
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What 17-4 PH must meet.
| Condition | Aging treatment | Tensile strength, min (ksi) | Yield strength, min (ksi) | Elongation, min (%) | Reduction of area, min (%) | Hardness, min | Charpy V-notch, min (ft·lbf) |
|---|---|---|---|---|---|---|---|
| H900 | 900 °F, 1 h | 190 | 170 | 10 | 35 | 40 HRC / 388 HBW | — |
| H925 | 925 °F, 4 h | 170 | 155 | 10 | 38 | 38 HRC / 375 HBW | 5 |
| H1025 | 1025 °F, 4 h | 155 | 145 | 12 | 45 | 35 HRC / 331 HBW | 15 |
| H1075 | 1075 °F, 4 h | 145 | 125 | 13 | 45 | 32 HRC / 311 HBW | 20 |
| H1100 | 1100 °F, 4 h | 140 | 115 | 14 | 45 | 31 HRC / 302 HBW | 25 |
| H1150 | 1150 °F, 4 h | 135 | 105 | 16 | 50 | 28 HRC / 277 HBW | 30 |
| H1150D | 1150 °F, 4 h, air cool, then 1150 °F, 4 h | 125 | 105 | 16 | 50 | 24–33 HRC / 255–311 HBW | 30 |
| H1150M | 1400 °F, 2 h, air cool, then 1150 °F, 4 h | 115 | 75 | 18 | 55 | 24 HRC / 255 HBW | 55 |
Values per ASTM A1082/A1082M-16(2021) Table 3 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team. Aging temperatures ± 25 °F; times are minimums at temperature; air or gas cool. Applies to 8 in. thickness and under.
Solution treated at 1900 °F and cooled below 90 °F, then age hardened to the ordered condition (H900 through H1150M). Ageing is performed after machining and threading; the condition and cycle are recorded on the certificate.
Full 17-4 PH data sheet: chemistry, physical properties and standards →
Made to standard or to your drawing.
- Pump shafts, impellers and wear rings
- Valve stems, seats and bonnet bolting
- Subsea and wellhead components (H1150D / H1150M for NACE)
- Aerospace and defence fasteners
- Chemical and food process equipment needing strength and corrosion resistance