17-4PH / 630
STAINLESS STEEL
FASTENERS MANUFACTURER
High-strength 17-4PH bolts, stud bolts and custom fasteners engineered for valves, machinery, aerospace and precision industrial applications.
17-4PH Alloy Expertise
UNS S17400 fasteners available in different age-hardened conditions for demanding industrial applications.
Heat-Treatable Strength
Controlled aging provides different combinations of strength, hardness, ductility and toughness.
Custom Manufacturing
Standard and drawing-based 17-4PH fasteners manufactured to project-specific requirements.
17-4PH / 630 Fasteners for High-Strength Industrial Applications
17-4PH, also known as Type 630 or UNS S17400, is a martensitic precipitation-hardening stainless steel containing chromium, nickel, copper and niobium.
The alloy combines high strength and hardness with good corrosion resistance and practical machining characteristics. It is commonly supplied in the solution-treated condition and subsequently aged to obtain the required mechanical properties.
Different aging conditions provide different combinations of strength, hardness, ductility and toughness. The final material condition should therefore be specified according to the application, product dimensions and governing project requirements.
Why 17-4PH / 630 Is Selected for Critical Fastening Applications
17-4PH combines high strength, age-hardening flexibility and good corrosion resistance for demanding mechanical and precision fastening systems.
High Strength & Hardness
Age hardening provides high tensile and yield strength for demanding load-bearing and mechanically stressed connections.
Adjustable Strength-Toughness Balance
Different aging conditions allow engineers to balance strength, hardness, ductility and toughness according to the application.
Controlled Heat-Treatment Response
Solution-treated material can be machined before receiving the specified age-hardening treatment and final mechanical properties.
Good Corrosion Resistance
17-4PH provides better corrosion resistance than many conventional hardenable martensitic stainless steels while maintaining high mechanical strength.
17-4PH / 630 Material Identification & Specifications
17-4PH, Type 630 and UNS S17400 identify the same alloy family, while the applicable standard defines the ordered product form and condition.
Material Identification
- Common Name: 17-4PH Stainless Steel
- AISI / Type: Type 630
- UNS: S17400
- EN / W.Nr.: 1.4542
Common Standards
- ASTM A564
- ASTM A705
- AMS 5643
- ASME SA564
- EN 10088-3
Characteristics
- High strength after age hardening
- Good corrosion resistance
- Adjustable strength and toughness
Applications
- Valves & pumps
- Aerospace fittings
- Shafts & gears
- Precision machinery
Important Note: 17-4PH, Type 630 and UNS S17400 refer to the same alloy family. They should not be presented as different material grades.
Common 17-4PH Material Conditions
The selected aging condition determines the final balance of strength, hardness, ductility and toughness.
Solution-treated condition prior to age hardening.
Condition A is the solution-treated condition of 17-4PH and is commonly used for machining before the specified aging treatment. The final material condition shall follow the governing specification or customer drawing.
Highest strength and hardness among the commonly used single-aging conditions.
H900 is typically selected where maximum room-temperature tensile strength, yield strength and hardness are required.
High strength with improved ductility, toughness and stress-corrosion resistance compared with H900.
H1025 provides a useful balance for demanding mechanical components requiring high strength with improved toughness.
Balanced strength, ductility and toughness for general high-strength applications.
H1075 is suitable where the highest H900 strength is unnecessary and a more balanced mechanical condition is preferred.
Lower strength with higher ductility and toughness.
H1150 is generally selected where toughness and ductility are more important than maximum strength and hardness.
H900, H1025, H1075 and H1150 are heat-treatment conditions, not separate stainless steel grades.
Chemical Composition of 17-4PH
Chromium, nickel, copper and niobium provide the corrosion resistance and precipitation-hardening response of 17-4PH stainless steel.
| Grade | Cr (%) | Ni (%) | Cu (%) | Nb + Ta (%) | C (%) | Mn (%) | Si (%) | Other (%) |
|---|---|---|---|---|---|---|---|---|
| 17-4PH / S17400 | 15.00–17.50 | 3.00–5.00 | 3.00–5.00 | 0.15–0.45 | 0.07 max | 1.00 max | 1.00 max | P 0.040 max, S 0.030 max, Fe balance |
Technical Note: Exact chemical limits shall follow the governing material specification and actual batch MTC.
Mechanical Performance of 17-4PH / 630
The selected aging temperature controls the balance between strength, hardness, ductility and toughness in 17-4PH stainless steel.
| Material Condition | Tensile Strength (MPa) | 0.2% Yield Strength (MPa) | Elongation (%) | Typical Hardness |
|---|---|---|---|---|
| H900 | Approx. 1365 | Approx. 1262 | Approx. 15 | Approx. 44 HRC |
| H1025 | Approx. 1158 | Approx. 1117 | Approx. 16 | Approx. 38 HRC |
| H1075 | Approx. 1131 | Approx. 1020 | Approx. 17 | Approx. 36 HRC |
| H1150 | Approx. 993 | Approx. 869 | Approx. 20 | Approx. 33 HRC |
Technical Note: These are typical room-temperature material values, not universal finished-fastener minimums. Actual properties depend on product form, dimensions, heat treatment and the governing specification.
17-4PH Heat-Treatment Condition Selection Guide
Select the material condition according to the required strength, hardness, ductility, toughness
and project specification.
| Application Requirement | Recommended Condition |
|---|---|
| Machining before final age hardening | Condition A |
| Maximum tensile and yield strength | H900 |
| Maximum hardness | H900 |
| High strength with improved toughness | H1025 |
| Improved stress-corrosion resistance compared with H900 | H1025 or higher aging temperature |
| Balanced strength and ductility | H1075 |
| Higher toughness with reduced strength | H1150 |
| Final production and acceptance | Condition stated in the governing specification or drawing |
Selection Note: The heat-treatment condition should be confirmed before quotation and production, especially when hardness, tensile testing or dimensional stability is specified.
17-4PH / 630 Fastener Product Range
17-4PH fasteners are available in standard and custom configurations for valves, machinery, aerospace, energy and precision industrial applications.
17-4PH Hex Bolts
- Product Type:
- Hex Head Bolts / Full Thread Hex Bolts / Partial Thread Hex Bolts / Custom Hex Bolts
- Size Range:
- Standard / Custom
- Thread System:
- Metric / UNC / UNF
- Thread Type:
- Coarse / Fine
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- H900 / H1025 / H1075 / H1150 as Specified
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
17-4PH Heavy Hex Bolts
- Product Type:
- Heavy Hex Bolts / Large Diameter Heavy Hex Bolts / Custom Heavy Hex Bolts
- Size Range:
- Standard / Custom
- Thread System:
- Metric / UNC / UNF
- Thread Type:
- Coarse / Fine
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- According to Project Requirements
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
17-4PH Stud Bolts
- Product Type:
- Fully Threaded Studs / Double End Studs / Tap End Studs / Flange Stud Sets
- Size Range:
- Standard / Custom
- Thread System:
- Metric / UNC / UNF / 8UN
- Thread Type:
- Coarse / Fine
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- H900 / H1025 / H1075 / H1150 as Specified
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
17-4PH Nuts
- Product Type:
- Hex Nuts / Heavy Hex Nuts / Custom Nuts
- Size Range:
- Matched to Bolt / Stud Size
- Thread System:
- Metric / UNC / UNF
- Thread Type:
- Coarse / Fine
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- According to Assembly Requirements
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
17-4PH Washers
- Product Type:
- Flat Washers / Heavy Washers / Custom Washers
- Size Range:
- Standard / Custom
- Inner Diameter:
- Standard / Custom
- Outer Diameter:
- Standard / Custom
- Thickness:
- Standard / Custom
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- As Specified
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
17-4PH Socket Head Cap Screws
- Product Type:
- Socket Head Cap Screws / Custom Socket Screws
- Size Range:
- Standard / Custom
- Thread System:
- Metric / UNC / UNF
- Thread Type:
- Coarse / Fine
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- H900 / H1025 / H1075 / H1150 as Specified
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
17-4PH Threaded Rods
- Product Type:
- Fully Threaded Rods / Cut-to-Length Threaded Rods
- Size Range:
- Standard / Custom
- Thread System:
- Metric / UNC / UNF
- Thread Type:
- Coarse / Fine
- Dimensional Standards:
- ISO / DIN / ASME, as applicable, or customer drawings.
- Heat Treatment:
- According to Project Requirements
- Documentation:
- MTC / EN 10204 3.1 / Heat No. Traceability
Custom 17-4PH Fasteners & Machined Components
- Product Type:
- Custom Bolts / Special Studs / Threaded Parts / Machined Components
- Size Range:
- According to Drawing
- Material Condition:
- According to Drawing / Project Specification
- Tolerance:
- According to Drawing
- Manufacturing Basis:
- Customer Drawing / Project Specification
- Inspection:
- Dimensional / PMI / Hardness / Mechanical Testing as Required
Need a Product Type Not Shown Here?
We also manufacture custom and project-specific fasteners according to drawings, specifications or application requirements.
Manufacturing Excellence
A controlled manufacturing process supports consistent quality from verified raw material to finished and age-hardened 17-4PH fasteners.
Raw Material Review
Material grade, condition, product form and batch documentation are reviewed before production.
Cutting & Preparation
Bars or forgings are prepared according to product dimensions and the selected manufacturing route.
Forging / CNC Machining
Fasteners are forged, turned or precision machined according to product geometry, quantity and drawing requirements.
Thread Production
Threads are rolled or cut according to product dimensions, material condition and applicable requirements.
Heat Treatment
Solution treatment and age hardening are performed according to the required material condition and governing specification.
Finishing & Packing
Finished parts are cleaned, inspected, identified and packed according to order and traceability requirements.
Quality Assurance & Full Traceability
Inspection and documentation are planned around the purchase specification, customer drawing and intended service. The agreed inspection scope is confirmed according to individual project requirements.
Material Verification
Material grade, heat or lot number and incoming documents are checked against the agreed order requirements before production.
Heat Number Traceability
Batch identity is maintained through production, inspection and packing so finished parts can be linked to their source material.
Dimensional Inspection
Critical dimensions, tolerances and product geometry are checked against the applicable dimensional standard or customer drawing.
Thread Inspection
Thread size, pitch and fit are verified using suitable gauges and measuring equipment. Additional profile verification can be arranged when specified.
PMI & Mechanical Testing
PMI, hardness, tensile or other testing can be performed or arranged when specified, depending on the material, test method and project requirements.
MTC / EN 10204 3.1 Documentation
MTC / EN 10204 3.1 documentation, dimensional reports, PMI reports and traceability records can be supplied when specified and applicable.
Inspection methods, sampling plans, acceptance criteria and document requirements should be confirmed before order placement.
Discuss Inspection & Documentation RequirementsApplications & Industries
Our specialty-alloy fasteners support demanding projects across multiple industries. Final material selection must be based on the actual temperature, corrosion medium, mechanical load, applicable standards and required service life.
Oil & Gas
Flange bolting, valves, pressure equipment, piping systems and process units exposed to pressure, temperature or corrosive media.
Chemical Processing
Reactors, heat exchangers, scrubbers, pumps and equipment handling acids, chlorides or other aggressive process media.
Power Generation
Gas and steam turbines, boilers, furnaces, heat-treatment systems and high-temperature mechanical assemblies.
Marine & Offshore
Offshore platforms, seawater systems, marine equipment and desalination installations requiring corrosion-resistant fastening.
Aerospace
Engine, thermal and precision assemblies requiring high strength, temperature capability, low weight or controlled material performance.
Nuclear & Critical Equipment
Safety-critical bolting and engineered components requiring controlled materials, documentation and reliable long-term performance.
Not every alloy is suitable for every industry or service condition. Material suitability should be confirmed against the governing specification and actual operating environment.
Discuss Your ApplicationFrequently Asked Questions
Common questions about specialty-alloy fasteners, custom manufacturing, standards, inspection, documentation and procurement.
1. What specialty-alloy fastener products can you manufacture?
2. Can you manufacture non-standard parts from customer drawings?
3. Which dimensional and thread standards can you support?
4. Can you provide MTC and EN 10204 3.1 documentation?
5. Is PMI or third-party inspection available?
6. How do you maintain material traceability?
7. Can you supply bolts, nuts and washers as matched bolting sets?
8. What are your MOQ and lead time?
Custom & Standard
17-4PH Fasteners,
Direct From
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Send us your 17-4PH / 630 fastener specifications, standards or drawings. Our engineering team will review your requirements and provide a detailed project-specific quotation.
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