17-4 PH Fasteners
Raychin 17-4 fasteners are available in 8 different aged (precipitation hardened) conditions offering a variety of mechanical properties (see below). In addition, we also offer 17-4PH fasteners per ASTM F593 Grade 630 which ensures specific tensile and yield strengths.
RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS
STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC
An extremely strong precipitation hardened stainless steel
· Well suited for high strength applications
· Up to 4x stronger than 316 stainless steel
· Maintains its mechanical strength up to 600°F
· 17-4PH Chemistry & Specifications
· ASTM F593, Grade 630 fasteners
· 17-4PH Datasheet
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17-4 PH Fasteners: Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods
RAYCHIN LIMITED is a recognized expert in 17-4 PH fasteners — from 17-4 PH bolts, 17-4 PH nuts, 17-4 PH screws, 17-4 PH washers to 17-4 PH stud bolts and 17-4 PH threaded rods. Our portfolio includes heavy hex bolts, hex nuts, socket head cap screws, flat and lock washers, continuous thread rods, double-end studs, and custom non-standard fasteners. Engineered for extreme environments: aerospace, subsea, chemical processing, nuclear, and high-pressure oil & gas where high temperature resistance and corrosion protection are critical.
Expertise Across the Full Fastener Range
17-4 PH Bolts & Stud Bolts
Hex bolts, heavy hex bolts, structural bolts, flange bolts, socket head cap screws (often used as bolts), and precision stud bolts with UNC/UNF or metric threads. All 17-4 PH stud bolts are available with two heavy hex nuts (material per ASTM A564 / A564M Grade 630). Diameters from 1/4" to 4" (M6 – M100). Lengths up to 4000 mm for threaded rods.
Also: 17-4 PH T-bolts, eye bolts, and bend bolts for specialized clamping.
17-4 PH Nuts
Hex nuts, heavy hex nuts, jam nuts, slotted/castle nuts, flange nuts, square nuts, and dome nuts. Precision tapped 17-4 PH nuts meet Class 2B / 6H. Proof load tested in accordance with applicable ASTM standards. Our inventory includes 17-4 PH coupling nuts for threaded rod connections.
17-4 PH Screws
Machine screws (pan, flat, round, truss head), socket set screws, button head cap screws, flat head cap screws, and self-tapping screws. 17-4 PH screws are ideal for high-vibration assemblies requiring both strength and corrosion resistance. Custom drive types available.
17-4 PH Washers
Flat washers (USS, SAE, and oversize), spring lock washers, toothed lock washers, and thrust washers. Our 17-4 PH washers are punched or machined from solution-annealed bar/plate, then precipitation hardened. Precise flatness and chamfers.
17-4 PH Threaded Rods
Continuous thread rods (full thread) in 1m, 2m, 3m lengths or custom cut. 17-4 PH threaded rods meet ASTM A564 / A276. Used as tie rods, anchor bolts, and HVAC supports. Also supplied in 17-4 PH with rolled threads for improved grain flow.
Custom & Specialty 17-4 PH Fasteners
From 17-4 PH dowel pins to valve stem extensions, we machine complex geometries. Expert heat treatment (H900, H925, H1025, H1075, H1100, H1150, H1150M, H1150D) precisely controlled for each batch.
International Standards & Global Designations for 17-4 PH
To serve clients worldwide, RAYCHIN LIMITED manufactures 17-4 PH fasteners to the following national and international specifications. This ensures full compliance for projects in the Americas, Europe, Asia, and the Middle East.
ASTM A564 GR.630 AMS 5604 AMS 5643 1.4542 SUS630 X5CrNiCuNb16-4 UNS S17400 17-4PH
Chemical Composition (Weight %) – 17-4 PH Precipitation Hardening Stainless Steel
Our 17-4 PH bolts, nuts, screws, washers, stud bolts and threaded rods are produced from melts that strictly conform to the limits below per ASTM A564 / AMS 5604. The precise addition of copper and niobium enables age-hardening to achieve high strength.
Expert note: The Nb/Cu ratio ensures consistent precipitation of coherent copper-rich clusters during aging. This yields tensile strengths up to 190 ksi (1310 MPa) in the H900 condition while retaining good ductility. All raw material is positively identified by PMI (Positive Material Identification) and certified with mill test reports.
Complete Mechanical Properties (by Heat Treatment Condition per ASTM A564/A564M)
17-4 PH fasteners are typically supplied in one of eight standard heat treatment conditions. RAYCHIN LIMITED recommends the appropriate temper based on your strength vs. toughness requirements. The data below represent minimum values for fasteners (longitudinal direction) per ASTM A564/A564M Table 3.
Condition H900 (480°C / 900°F) – Highest Strength
Condition H925 (495°C / 925°F) – Slightly lower strength, improved toughness
Condition H1025 (550°C / 1025°F) – Best combination of strength & toughness
Condition H1075 (580°C / 1075°F) – Improved ductility
Condition H1100 (595°C / 1100°F) – Enhanced toughness
Condition H1150 (620°C / 1150°F) – Maximum stress corrosion resistance
Condition H1150M (760°C + 620°C / 1400°F + 1150°F) – Double aged, maximum ductility
Condition H1150D (620°C + 620°C / 1150°F + 1150°F) – Double aged, improved properties
Additionally, 17-4 PH fasteners exhibit excellent fracture toughness (KIC values from 50 to 110 MPa√m depending on temper) and very high fatigue strength. Our test certificates include actual values from each production lot.
High Temperature Performance of 17-4 PH Fasteners
17-4 PH stainless steel is widely used in applications requiring retention of mechanical properties at elevated temperatures. The material maintains excellent strength up to 400°C (752°F), beyond which copper-rich precipitates begin to coarsen.
Temperature-Dependent Strength Retention (Condition H900)
Studies demonstrate that yield strength of 17-4 PH decreases with increasing temperature, with thermal softening becoming significant above 400°C. Fatigue strength in the long-life regime at 300°C can be superior to room temperature performance due to surface oxidation and thermal activation mechanisms. For applications requiring strength retention above 400°C, special heat treatments or reinforced variants may be considered.
Thermal Stability Limits
Corrosion Resistance of 17-4 PH Fasteners
17-4 PH stainless steel offers excellent corrosion resistance comparable to 304 stainless steel in many environments, attributed to its high chromium content (15-17.5%) which forms a protective Cr₂O₃ passive layer. The corrosion behavior is significantly influenced by heat treatment condition and aging parameters.
Corrosion Performance in Different Environments
Effect of Heat Treatment on Corrosion Rate
Critical Corrosion Considerations
- Sensitization: Aging above 495°C can cause chromium carbide precipitation at grain boundaries, leading to chromium depletion and increased susceptibility to intergranular corrosion.
- Pitting Resistance: Increases when aging temperature rises from 480°C to 550°C, but decreases at 620°C due to reversed austenite formation and precipitate coarsening.
- Optimal Aging: Solution treatment at 1040°C followed by aging at 480°C for 4 hours provides the best combination of hardness and corrosion resistance.
- Comparison to 304: 17-4 PH offers comparable corrosion resistance to 304 stainless steel in many environments, with significantly higher strength.
Corrosion Engineering Note: For critical applications in aggressive environments, RAYCHIN LIMITED can provide passivation, specialized coatings (Xylan, PTFE, silver plating), or recommend optimal heat treatment conditions (H1150 for maximum stress corrosion cracking resistance). Third-party corrosion testing per ASTM G31, G48, or G61 available upon request.
Special focus: 17-4 PH Stud Bolts & Threaded Rods for High Temperature Service
For high-temperature or high-pressure bolting (e.g., heat exchangers, valves, flanges operating up to 400°C), RAYCHIN offers 17-4 PH stud bolts with heavy hex nuts manufactured from the same material grade. Threads can be rolled after heat treatment for optimum grain flow. 17-4 PH threaded rods are supplied in all conditions H900 through H1150D, with full-length straightening and third-party NDT (PT/UT) upon request. For sour service (NACE MR0175), H1150 condition is recommended for optimal sulfide stress corrosion cracking resistance. All products comply with ASME B1.1 for inch threads or ISO 965 for metric threads.
Why RAYCHIN LIMITED – The 17-4 PH Fastener Authority
Metallurgical competence
Engineers on staff with deep expertise in precipitation hardening. We control aging parameters to ±5°C for consistent mechanical properties across all 17-4 PH bolts, nuts, screws, washers, stud bolts & threaded rods. Every heat is verified by in-house testing.
Global approvals & traceability
Our quality system is ISO 9001:2015 certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available.
Extensive inventory & rapid delivery
We stock 17-4 PH hex bolts (M6–M36), heavy hex nuts, flat washers, and continuous thread rods in multiple tempers. Emergency services for shutdowns with 24/7 support.
Custom solutions
Need a special 17-4 PH stud bolt with reduced shank, extra-large washers, or non-standard thread length? Our CNC turning and grinding departments handle short runs with agility. We also provide specialized coatings (Xylan, PTFE, silver plating) and corrosion testing.
Contact the 17-4 PH fastener experts today
Request a quote for 17-4 PH bolts, nuts, screws, washers, stud bolts & threaded rods – any global standard, any condition, any quantity. Inquire about high temperature or corrosion-resistant applications.
sales@ray-chin.com | +86 534 2166 566Our team speaks English, German, Mandarin, and Japanese – ready for your global procurement.
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17-4 PH Fasteners![17-4 PH Bolts]( "17-4 PH Bolts")
17-4 PH Bolts![17-4 PH Nuts]( "17-4 PH Nuts")
17-4 PH Nuts![17-4 PH Screws]( "17-4 PH Screws")
17-4 PH Screws![17-4 PH Washers]( "17-4 PH Washers")
17-4 PH Washers![17-4 PH Studs]( "17-4 PH Studs")
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17-4 PH Lock Nuts![17-4 PH Hex Cap Screws]( "17-4 PH Hex Cap Screws")
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17-4 PH Socket Head Cap Screws![17-4 PH Vented Screws]( "17-4 PH Vented Screws")
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17-4 PH Button Head Cap Screws
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