PH Stainless Steel Fasteners Supplier
MT.BOLTS manufactures PH stainless steel fasteners using high-strength, corrosion-resistant precipitation-hardening stainless steel alloys such as 17-4 PH, 15-5 PH, and 13-8 Mo. These fasteners are designed to perform in critical applications requiring high mechanical strength, dimensional stability, and moderate-to-good corrosion resistance. They are widely used in aerospace, nuclear, marine, automotive, and high-performance industrial equipment.
Our PH Stainless Steel fasteners have the following specifications:
- Diameter: M3 to M64 | #4 to 2.5″
- Length: 6mm to 500mm | 0.25″ to 20″
- Thread Pitch: Metric (Coarse/Fine) | UNC/UNF
- Standards: ASME B18.2.1, ASME B18.3, ASME B18.2.2, DIN/ISO/EN (e.g., DIN 933, DIN 934)
- Material Specifications:
- ASTM A564 (for 17-4 PH, 15-5 PH, 13-8 Mo)
- AMS 5643, AMS 5659, AMS 5629 (aerospace specifications)
- Types: Bolts, Screws, Nuts, Washers, Studs
PH Stainless Steel refers to precipitation-hardening stainless steel, a class of stainless steels whose strength is enhanced through a precipitation-hardening heat treatment process.
We regularly supply PH stainless steel fasteners and bolts in the following grades: 17-4 PH and Custom 15-5 PH. Their chemical compositions and physical properties are provided below for your procurement reference.
| Grade Name | UNS Number | Key Characteristics |
| 17-4 PH | S17400 | Most widely used PH grade; high strength, good corrosion resistance, heat treatable to H900–H1150 conditions |
| 15-5 PH | S15500 | Improved version of 17-4 PH with better toughness and enhanced stress corrosion resistance |
PH Stainless Steel Chemical Composition
| Element | 17-4 PH (UNS S17400) | 15-5 PH (UNS S15500) |
| Chromium (Cr) | 15.0 – 17.5 | 14.0 – 15.5 |
| Nickel (Ni) | 3.0 – 5.0 | 3.5 – 5.5 |
| Copper (Cu) | 3.0 – 5.0 | 2.5 – 4.5 |
| Manganese (Mn) | ≤ 1.0 | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 | ≤ 1.0 |
| Columbium + Tantalum (Nb + Ta) | 0.15 – 0.45 | — |
| Molybdenum (Mo) | — | ≤ 0.5 |
| Phosphorus (P) | ≤ 0.04 | ≤ 0.03 |
| Sulfur (S) | ≤ 0.03 | ≤ 0.03 |
| Carbon (C) | ≤ 0.07 | ≤ 0.07 |
| Iron (Fe) | Balance | Balance |
PH Stainless Steel Mechanical Properties
| Property | 17-4 PH (H900) | 15-5 PH (H900) |
| Tensile Strength | ≥ 1310 MPa (190 ksi) | ≥ 1310 MPa (190 ksi) |
| Yield Strength (0.2% offset) | ≥ 1170 MPa (170 ksi) | ≥ 1170 MPa (170 ksi) |
| Elongation in 2″ | ≥ 10% | ≥ 10% |
| Hardness | ~ HRC 40 | ~ HRC 40 |
| Density | ~7.75 g/cm³ | ~7.78 g/cm³ |
PH Stainless Steel Fastener Types
MT.BOLTS offers a comprehensive range of PH Stainless Steel Fasteners for your selection to meet various application requirements:
PH Stainless Steel Hex Head Screw Bolts
PH Stainless Steel Square Head Bolts
PH Stainless Steel Flange Bolts
PH Stainless Steel Serrated Flange Bolts
PH Stainless Steel Eye bolts
PH Stainless Steel Carriage Bolts
PH Stainless Steel Elevator Bolts
PH Stainless Steel U-Bolts
PH Stainless Steel Anchor Bolts
PH Stainless Steel Expansion Bolt
PH Stainless Steel Lag Bolts
PH Stainless Steel U-Bolts
PH Stainless Steel Hex Head Lag Screws
PH Stainless Steel Shoulder Screws
PH Stainless Steel Socket Cap Screws
PH Stainless Steel Self-Tapping Screws
PH Stainless Steel Hex Nuts
PH Stainless Steel Serrated Flange Nuts
PH Stainless Steel Lock Nuts
PH Stainless Steel Wing Nuts
PH Stainless Steel Coupling Nut
PH Stainless Steel Square Nuts
PH Stainless Steel Acorn Nuts
PH Stainless Steel Wing Nuts
PH Stainless Steel Fully Threaded Rods & Studs
PH Stainless Steel Equal Thread Length Rods & Studs
PH Stainless Steel Unequal Thread Length Rods & Studs
PH Stainless Steel Single End Threaded Studs
PH Stainless Steel Weld Studs
PH Stainless Steel Press-In Captive Studs
PH Stainless Steel Flat Washers
PH Stainless Steel Lock Washers
PH Stainless Steel Curved Washers
PH Stainless Steel Wave Washers
PH Stainless Steel Square Washers
PH Stainless Steel Belleville Washers
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Reasons to Choose PH Stainless Steel Fasteners
PH (Precipitation Hardening) stainless steel fasteners offer an exceptional combination of high mechanical strength, good corrosion resistance, and dimensional stability. Unlike conventional stainless steels, PH grades such as 17-4 PH, 15-5 PH, and Custom 465® can be heat treated to achieve tensile strengths exceeding 1000 MPa, all while maintaining moderate to excellent resistance to corrosion. These fasteners are ideal when strength-to-weight ratio, reliability, and performance in corrosive or high-load environments are critical.
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Application of PH Stainless Steel Fasteners
PH stainless steel fasteners are widely used in industries that demand high strength, toughness, and resistance to corrosive conditions. Common application areas include:
- Aerospace: structural assemblies, jet engine components, and landing gear
- Nuclear and Power Generation: pressure vessels, core internals, and control rods
- Marine Engineering: shaft systems, propeller hubs, and structural fasteners
- Medical Devices: surgical tools and orthopedic implants (due to cleanliness and strength)
- High-Performance Automotive: drivetrain and suspension fasteners
- General Industry: food processing, petrochemical, and high-pressure valves
FAQ About PH Stainless Steel Fasteners and Bolts
PH stands for Precipitation Hardening, a heat treatment process that forms fine particles inside the metal to significantly improve strength.
Yes. Grades like 17-4 PH provide corrosion resistance similar to 304 stainless steel, while Custom 465® and 13-8 Mo offer improved resistance in more aggressive environments.
Some PH grades can be welded (e.g., 17-4 PH), but post-weld heat treatment is often required to restore strength and corrosion resistance.
Standards include ASTM A564 (bars and forgings), AMS 5643, and dimensional standards like ASME B18.2.1 and DIN 933.
Typical heat treatment conditions include H900, H1025, and H1150, each offering different balances of strength and ductility.
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