Name: 17-4 PH Fasteners
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17-4 PH Fasteners

17-4 PH fasteners are made from a precipitation hardened stainless steel most known for its exceptional strength and its ability to maintain its mechanical properties to 600°F. Compared to 316 stainless steel, 17-4 PH fastener's yield strength is up over 4 times greater. When compared to Duplex 2205 fasteners, the yield strength of 17-4 PH can be up to 2-½ times greater.
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

Precipitation Hardening Stainless Steel (UNS S17400 / ASTM A564 Grade 630 / 1.4542 / SUS630)

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.

17-4 PH bolts17-4 PH nuts17-4 PH screws17-4 PH washers17-4 PH stud bolts17-4 PH threaded rods17-4 PH heavy hex bolts17-4 PH hex nuts17-4 PH flat washers17-4 PH socket cap screws17-4 PH coupling nuts17-4 PH all-thread rods17-4 PH double-end studs17-4 PH eye boltsAISI 630 fasteners17-4PH studs

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.

Manufacturing Standards for 17-4 PH Fasteners

RAYCHIN LIMITED manufactures 17-4 pH fasteners to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.

17-4 PH Fastener Styles

17-4 PH Screws	12 Point Screws Button Head Cap Screws Flat Head Screws Hex Head Cap Screws Pan Head Screws Security Screws Set Screws Socket Head Cap Screws Vented Screws	• DIN 603 / ISO 8677 • DIN 912 / ISO 4762 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029 • DIN 921 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676 • DIN 965 / ISO 7046 • DIN 966 / ISO 7047 • DIN 7991 / ISO 10642 • DIN 7380 / ISO 7380 • DIN 84 / ISO 1207 • DIN 85 / ISO 1580 • DIN 34822 • DIN 34821 • DIN 7504 / ISO 15480 • DIN 7984 • DIN 963 / ISO 2009




















17-4 PH Bolts	Hex Head Bolts Shoulder Bolts Wedge Anchor Bolts	• DIN 931 • DIN 933 • ISO 4014 • ISO 4017 • ISO 7370




17-4 PH Nuts	Hex Nuts Lock Nuts	• DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 985 / ISO 7040 • DIN 986 • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161





17-4 PH Studs/Rod	Studs Threaded Rod Weld Studs	• DIN 975 • DIN 976


17-4 PH Washers	Flat Washers Lock Washer	• DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091 • DIN 127 / ISO 7090 • DIN 9021 / ISO 7093



17-4 PH Hose Clamps	Medium Duty Hose Clamps	--

17-4 PH Screws

12 Point Screws	17-4 PH 12 point screws allow for higher torque to be applied than a socket head cap screw or head head bolt, however they are be less economical due to the complex head design. Available in 1/4" or larger sizes.	• IFI-115 • MIL SPEC • DIN 34822 • DIN 34821



Button Head Cap Screws	17-4 PH button head screws offer a wide clamping area and low profile. They are best for fastening material that is too thin to counter bore.	• ASME B18.3 • ASME 18.3.4M • DIN 7380 / ISO 7380


Flat Head Screws	17-4 PH flat head screws are most commonly offered in an 82° countersink angle, but can be customized to other angles from 60° -120° and are designed to be flush with the surface. Available in slotted and socket drivers. Phillips, 6-lobe, torx and tamperproof drivers in Inconel flat head screws can be made require special manufacturing.	• ASME B18.3 • ASME B18.3.6 • DIN 963 / ISO 2009 • DIN 965 / ISO 7046 • DIN 7991 / ISO 10642




Hex Head Cap Screws	17-4 PH hex head cap screws offer the added washer face to the bolt head which is lacking on a hex bolt and tighter dimensional tolerances. Ideal for a high clamping force applications with ease of access. Generally availabe in #2 - 1/2" sizes and metric sizes.	• ASME B18.6.3 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676



Pan Head Screws	17-4 PH pan head screws offer a rounded top are best used for small diameter faster needs. Offered in slotted and they are ideal for low torque applications.	• ASME B18.6.3 • DIN 7985 • DIN 921 • DIN 85 / ISO 1580 • DIN 84 / ISO 1207 (cheese head) • DIN 966 / ISO 7047 (raised counter sunk)







Security Screws	Unique driver designs offer these 17-4 PH screws resistance to unwanted tampering or removal due to the fact that they cannot be removed using an ordinary driver. Inconel security screws are available in several different drive styles, as well as custom per print.	--

Set Screws	17-4 PH set screws are available in cup, cone, flat, dog and half-dog points. Set screws have no head and are equiped with a socket or slotted driver at one end.	• ASME B18.3 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029




Socket Head Cap Screws	17-4 PH socket head cap screws are ideal for limited access situations where there is little clearance around the screws. They offer a safe, reliable and economic solution.	• ASMET B18.3 • DIN 912 / ISO 4762 • DIN 7984


Vented Screws	17-4 PH vented screws are best for vacuum environments because the hole drilled through its axis (from head through threads) allow gases and other contaminents to vent. Inconel vented screws are available in any style.	--

17-4 PH Bolts

Hex Head Bolts	17-4 PH hex bolts are similar to hex head cap screws but without the added washer face. They are ideal for high clamping force applications with ease access.	• ASME B18.2.1 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017


Shoulder Bolts	17-4 PH shoulder bolts are made up of a head, shoulder and threaded segment. The smooth shoulder section allows for rotating parts. Typically available with socket drivers.	• ASME • DIN 7379 / ISO 7379 • ISO 7370


Wedge Anchor Bolts	17-4 PH wedge anchor bolts offer a safe secure fastening solution for attaching equipment and other materials to concrete in corrosive environments.	--

17-4 PH Nuts

Hex Nuts	17-4 PH hex nuts are available in a variety of styles including finished hex nuts, jam nuts and heavy hex nuts.	• ASME B18.16.3 • ASME B18.2.2 • DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 986




Lock Nuts	17-4 PH lock nuts are available in all metal and polymer insert styles. All-metal lock provide even load distribution and can be used at high temperatures. Polymer insert styles are more economical and are best for temperatures under than 350°F.	• ASME B18.16.3M • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161 • DIN 985 / ISO 10511 / ISO 7040

17-4 PH Studs & Threaded Rod

Studs	17-4 PH studs are fully threaded or partially threaded and made to custom lengths.	• ASME B18.31.2 • DIN 976

Threaded Rod	17-4 PH threaded rod or all thread are available in lengths greater than 1 foot. Minimum order quantity is a total of 6 feet of length.	• ASME B1.1 • DIN 975

Weld Studs	17-4 PH weld studs are available in both arc or capacitor discharge (CD) styles. Weld studs provide an extremely secure fastening solution when one side of the stud needs to be permanently fix to a part and the other side with the threads accessible.	--

17-4 PH Washers

Flat Washers	17-4 PH washers are most commonly offered in SAE sizes, but also availabe in USS, oversized and custom sizes upon request.	• ASME 18.21.1 • SAE / USS • DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091




Lock Washers	17-4 PH lock washers are offered as split lock washers. Belleville spring lock washers can also be made upon request.	• ASME B18.21.1 • DIN 127 / ISO 7090 • DIN 6796 / ISO 10690

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.

Country / Region	Standard / Specification	Designation / Grade
USA	ASTM A564 / A564M / A693 / A705 / AMS 5604 / AMS 5643	Grade 630 · UNS S17400 · 17-4PH
Europe (CEN)	EN 10088-3, EN 10269 (for fasteners)	1.4542 · X5CrNiCuNb16-4
Germany (DIN)	DIN EN 1.4542, DIN 17440 (former)	X5CrNiCuNb16-4
Japan (JIS)	JIS G4303, JIS G4311, JIS G4318	SUS630
China (GB)	GB/T 1220, GB/T 8732	05Cr17Ni4Cu4Nb (0Cr17Ni4Cu4Nb)
France (NF)	NF A35-572/573	Z6CNU17.04
UK (BS)	BS S143, BS 3146 Part 2	17/4 PH (similar to AMS 5604)
Russia (GOST)	GOST 5632	10Х17Н4Б (10X17H4B - approximate)
ISO	ISO 683-17 (heat-treatable steels)	X5CrNiCuNb16-4

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.

Element	ASTM A564 / AMS 5604 (Range %)	Typical (analysis)
Carbon (C)	≤ 0.07	0.04
Manganese (Mn)	≤ 1.00	0.60
Phosphorus (P)	≤ 0.040	0.020
Sulfur (S)	≤ 0.030	0.010
Silicon (Si)	≤ 1.00	0.50
Chromium (Cr)	15.0 – 17.5	16.2
Nickel (Ni)	3.0 – 5.0	4.2
Copper (Cu)	3.0 – 5.0	3.6
Niobium + Tantalum (Nb+Ta)	0.15 – 0.45	0.28
Iron (Fe)	Balance	Balance

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

Property	Metric (min)	Imperial (min)
Tensile Strength (Rm)	1310 MPa	190 ksi
Yield Strength 0.2% (Rp0.2)	1170 MPa	170 ksi
Elongation in 4D	10%	10%
Reduction of Area	35%	35%
Hardness (HRC)	40 min	40 min

Condition H925 (495°C / 925°F) – Slightly lower strength, improved toughness

Tensile Strength	1170 MPa (170 ksi)	Yield	1070 MPa (155 ksi)
Elongation	10% min	RA	38% min
Hardness	38 HRC min

Condition H1025 (550°C / 1025°F) – Best combination of strength & toughness

Tensile Strength	1070 MPa (155 ksi)	Yield	1000 MPa (145 ksi)
Elongation	12% min	RA	45% min
Hardness	35 HRC min

Condition H1075 (580°C / 1075°F) – Improved ductility

Tensile Strength	1000 MPa (145 ksi)	Yield	860 MPa (125 ksi)
Elongation	13% min	RA	45% min
Hardness	32 HRC min

Condition H1100 (595°C / 1100°F) – Enhanced toughness

Tensile Strength	965 MPa (140 ksi)	Yield	795 MPa (115 ksi)
Elongation	14% min	RA	45% min
Hardness	31 HRC min

Condition H1150 (620°C / 1150°F) – Maximum stress corrosion resistance

Tensile Strength	930 MPa (135 ksi)	Yield	725 MPa (105 ksi)
Elongation	16% min	RA	50% min
Hardness	28 HRC min

Condition H1150M (760°C + 620°C / 1400°F + 1150°F) – Double aged, maximum ductility

Tensile Strength	795 MPa (115 ksi)	Yield	520 MPa (75 ksi)
Elongation	18% min	RA	55% min
Hardness	24 HRC min

Condition H1150D (620°C + 620°C / 1150°F + 1150°F) – Double aged, improved properties

Tensile Strength	860 MPa (125 ksi)	Yield	725 MPa (105 ksi)
Elongation	16% min	RA	50% min
Hardness	24-33 HRC (range)

Additionally, 17-4 PH fasteners exhibit excellent fracture toughness (K_IC 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)

Temperature	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
Room Temperature (20°C)	1310	1170	10
100°C (212°F)	~1270	~1130	~11
200°C (392°F)	~1220	~1080	~12
300°C (572°F)	~1170	~1030	~13
400°C (752°F)	~1100	~970	~14
600°C (1112°F)	~700	~550	~20

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

Parameter	Value
Maximum Service Temperature (continuous)	400°C (752°F)
Maximum Service Temperature (intermittent)	450°C (842°F)
Melting Point	1400-1440°C
Thermal Conductivity (100°C)	18.4 W/m·K
Coefficient of Thermal Expansion (20-100°C)	10.8 × 10⁻⁶ /°C

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

Environment	Corrosion Resistance	Notes
3.5% NaCl (seawater)	Good to Excellent	Corrosion rate as low as 1.19 × 10⁻³ mmpy after optimal aging (480°C/4h)
0.5M H₂SO₄ (sulfuric acid)	Moderate	Best resistance after solution treatment at 1040°C + aging at 480°C
Chloride environments	Good	Susceptible to pitting; pitting potential increases from 480-550°C aging
Marine atmosphere	Excellent	Widely used in marine fasteners and propeller shafts

Effect of Heat Treatment on Corrosion Rate

Condition	Corrosion Current (i_corr, µA/cm²)	Corrosion Rate (×10⁻³ mmpy)	Environment
As-received (no heat treatment)	0.3334	3.56	3.5% NaCl
ST + Aging 480°C/1h	0.1726	1.83	3.5% NaCl
ST + Aging 480°C/4h (Optimal)	0.1131	1.19	3.5% NaCl
ST + Aging 480°C/8h	0.1273	1.35	3.5% NaCl
ST + Aging 480°C/32h (overaged)	0.3649	3.87	3.5% NaCl

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.

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