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PH Grades

PH Grades Stainless Steel

Tailwind Aerospace Solutions stocks 15-5PH, 17-4PH, and 13-8MO precipitation-hardened stainless steel bar, plate, forged block, and sheet for aerospace, defense, oil and gas, and other high-performance manufacturing applications. PH stainless steels combine the corrosion resistance of conventional stainless with the ability to achieve high strength through age-hardening heat treatments. This makes them the preferred bar material for critical structural components where both mechanical performance and environmental resistance are required.

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15-5PH Stainless Steel

15-5PH is a chromium-nickel-copper precipitation-hardening stainless steel containing approximately 15% chromium and 5% nickel. It is a variant of the older 17-4PH grade, developed to provide improved toughness and more uniform mechanical properties in all directions. With a minimum tensile strength of 161,000 psi in the H900 condition, 15-5PH is widely specified for aerospace structural fittings, gears, shafts, and valve components. Tailwind stocks 15-5PH bar to ASTM A564 and AMS 5659. We also carry 15-5PH sheet and plate to AMS 5862.

17-4PH Stainless Steel

17-4PH is the most widely used precipitation-hardened stainless steel and serves as the baseline grade in this family. It is a chromium-nickel-copper alloy that can be heat treated to a range of strength levels depending on the aging temperature selected. In the H900 condition, 17-4PH reaches tensile strengths exceeding 190,000 psi. The alloy is weldable and forgeable, making it suitable for a broad range of aerospace, chemical, and petrochemical components. Tailwind supplies 17-4PH bar to ASTM A564 and AMS 5643, along with 17-4PH sheet and plate to AMS 5604.

 

13-8MO Stainless Steel

13-8MO is a precipitation-hardened stainless steel that offers the highest combination of strength, hardness, toughness, and corrosion resistance in the PH stainless family. Its chemistry is based on chromium, nickel, molybdenum, and aluminum, producing a refined martensitic structure after age hardening. 13-8MO achieves tensile strengths above 220,000 psi in the H950 condition while maintaining good ductility and transverse properties. It is specified for the most demanding aerospace hardware, including landing gear components, actuator parts, and structural fittings. Tailwind stocks 13-8MO bar to ASTM A564 and AMS 5629.

Specifications

13-8
Grade Condition Shape Temper Size Range Specifications
13-8 Plate Plate   0.250” – 6.00” AMS 5864, ASTM A564, DMS 2100, BMS 7-332
13-8   Sheet   0.016” – 0.190” AMS 5864, ASTM A564, DMS 2100, BMS 7-332
13-8 VAR Round   0.25” – 8.0” Diameter AMS 5629, ASTM A564, DMS 2100, BMS 7-332
13-8 VAR Square/Flat   0.50” × 0.50” – 4.00” × 8.00” AMS 5629, ASTM A564, DMS 2100, BMS 7-332
13-8 VAR Hexagon   0.3125” – 2.50” AMS 5629, ASTM A564, DMS 2100, BMS 7-332
13-8 Forged Round   0.50” – 8.0” Diameter AMS 5629, ASTM A564, DMS 2100, BMS 7-332
13-8 Forged Square/Flat   1.00” × 1.00” – 4.00” × 6.00” AMS 5629, ASTM A564, DMS 2100, BMS 7-332
13-8 Forged Hexagon   0.50” – 2.00” AMS 5629, ASTM A564, DMS 2100, BMS 7-332
13-8 Extruded Profile   Per drawing or custom profile  
15-5
Grade Condition Shape Temper Size Range Specifications
15-5 Plate Plate   0.250” – 6.00” AMS 5862, AMS-QQ-S-771, BMS 7-240
15-5   Sheet   0.016” – 0.190” AMS 5862, AMS-QQ-S-771, BMS 7-240
15-5 VAR Round   0.25” – 8.0” Diameter AMS 5659, ASTM A564, BMS 7-240
15-5 VAR Square/Flat   0.50” × 0.50” – 4.00” × 8.00” AMS 5659, ASTM A564, BMS 7-240
15-5 VAR Hexagon   0.3125” – 2.50” AMS 5659, ASTM A564, BMS 7-240
15-5 Forged Round   0.50” – 8.0” Diameter AMS 5659, ASTM A564, BMS 7-240
15-5 Forged Square/Flat   1.00” × 1.00” – 4.00” × 6.00” AMS 5659, ASTM A564, BMS 7-240
15-5 Forged Hexagon   0.50” – 2.00” AMS 5659, ASTM A564, BMS 7-240
15-5 ESR Round   0.50” – 8.0” Diameter AMS 5659, ASTM A564, BMS 7-240
15-5 ESR Square/Flat   1.00” × 1.00” – 4.00” × 6.00” AMS 5659, ASTM A564, BMS 7-240
15-5 ESR Hexagon   0.50” – 2.00” AMS 5659, ASTM A564, BMS 7-240
15-5 Extruded Profile   Per drawing or custom profile  
17-4
Grade Condition Shape Temper Size Range Specifications
17-4 Plate Plate   0.250” – 6.00” AMS 5604, AMS-QQ-S-772
17-4   Sheet   0.016” – 0.190” AMS 5604, AMS-QQ-S-772
17-4 Air Melt Round   0.25” – 8.0” Diameter AMS 5643, ASTM A564
17-4 Air Melt Square/Flat   0.50” × 0.50” – 4.00” × 8.00” AMS 5643, ASTM A564
17-4 Air Melt Hexagon   0.3125” – 2.50” AMS 5643, ASTM A564
17-4 Forged Round   0.50” – 8.0” Diameter AMS 5643, ASTM A564
17-4 Forged Square/Flat   1.00” × 1.00” – 4.00” × 6.00” AMS 5643, ASTM A564
17-4 Forged Hexagon   0.50” – 2.00” AMS 5643, ASTM A564
17-4 Hot Rolled Round   0.50” – 8.0” Diameter ASTM A484, ASTM A564
17-4 Hot Rolled Square/Flat   1.00” × 1.00” – 4.00” × 6.00” ASTM A484, ASTM A564
17-4 Hot Rolled Hexagon   0.50” – 2.00” ASTM A484, ASTM A564
17-4 Hot Rolled Annealed & Pickled Round   0.50” – 8.0” Diameter AMS 5643, ASTM A564
17-4 Hot Rolled Annealed & Pickled Square/Flat   1.00” × 1.00” – 4.00” × 6.00” AMS 5643, ASTM A564
17-4 Hot Rolled Annealed & Pickled Hexagon   0.50” – 2.00” AMS 5643, ASTM A564
17-4 Rough Turned Round   0.50” – 8.0” Diameter AMS 5643, ASTM A564
17-4 Rough Turned Square/Flat   1.00” × 1.00” – 4.00” × 6.00” AMS 5643, ASTM A564
17-4 Rough Turned Hexagon   0.50” – 2.00” AMS 5643, ASTM A564
17-4 Extruded Profile   Per drawing or custom profile  
17-7
Grade Condition Shape Temper Size Range Specifications
17-7   Plate   0.250” – 6.00” AMS 5528, AMS-QQ-S-773
17-7   Sheet   0.016” – 0.190” AMS 5528, AMS-QQ-S-773
17-7   Coil   0.016” – 0.190” AMS 5528, AMS-QQ-S-773
17-7 Melt Round   0.25” – 8.0” Diameter ASTM A276, AMS 5647, AMS-QQ-S-773
17-7 Melt Square/Flat   0.50” × 0.50” – 4.00” × 8.00” ASTM A276, AMS 5647, AMS-QQ-S-773
17-7 Melt Hexagon   0.3125” – 2.50” ASTM A276, AMS 5647, AMS-QQ-S-773
17-7 Extruded Profile   Per drawing or custom profile  
Our Quality Management System is certified to ISO 9001 and AS9100

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Common Applications

PH stainless steel grades from Tailwind serve aerospace structural hardware, landing gear fittings, actuators, turbine engine components, fasteners, valve assemblies, oil and gas downhole tools, and nuclear reactor components. The ability to achieve strength levels approaching those of alloy steels while retaining the corrosion resistance of stainless makes the PH family uniquely positioned for these applications.

Why Source PH Stainless from Tailwind?

Our Quality Management System is certified to ISO 9001 and AS9100, providing the quality documentation aerospace and defense manufacturers require. We supply material cut to size with full mill traceability and offer processing capabilities to support your production requirements.

Request a quick quote on 15-5PH, 17-4PH, or 13-8MO bar, or call us at 888-304-7075.

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