PH 13-8 Mo Fastener is a stainless steel with approximately 13% chromium and 8% nickel content that has good resistance to corrosion in general as well as to stress corrosion cracking. PH 13-8 Mo offers better mechanical properties in demanding environmental conditions in comparison to other materials based on iron. Precise control of the microstructure is achieved through vacuum melting and remelting. Medium to high strength can be achieved through precipitation hardening aging treatments.
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RAYCHIN LIMITED
Specialist in PH 13-8 Mo Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods
PH 13-8 Mo Fasteners: Precipitation-Hardening Stainless Steel for Extreme Strength & Toughness
UNS S13800 / W. Nr. 1.4534 / XM-12 / AMS 5629 / AMS 5864
RAYCHIN LIMITED is a leading manufacturer of PH 13-8 Mo fasteners — including PH 13-8 Mo bolts, PH 13-8 Mo nuts, PH 13-8 Mo screws, PH 13-8 Mo washers, PH 13-8 Mo stud bolts, and PH 13-8 Mo threaded rods. PH 13-8 Mo (UNS S13800) is a martensitic precipitation-hardening stainless steel alloyed with chromium, nickel, molybdenum, and aluminum. It combines ultra-high strength (up to 220 ksi / 1517 MPa) with excellent toughness and outstanding resistance to stress corrosion cracking. Our fasteners are manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, and KS standards, as well as custom configurations. PH 13-8 Mo is widely used in aerospace, defense, nuclear, oil & gas, and marine applications where high strength and corrosion resistance are critical. Fasteners are supplied in the solution-annealed condition (Condition A) and can be aged to various tempers (H950, H1000, H1025, H1050, H1100, H1150) to achieve specific mechanical property combinations. RAYCHIN delivers full traceability, PMI testing, and third-party certifications.
PH 13-8 Mo fastenersPH 13-8 Mo boltsPH 13-8 Mo nutsPH 13-8 Mo screwsPH 13-8 Mo washersPH 13-8 Mo stud boltsPH 13-8 Mo threaded rodsUNS S13800 bolts1.4534 fastenersXM-12 studsASTM A564 boltsAMS 5629 screwsAMS 5864AMS 5934high strength stainless fastenersaerospace boltsNAS1351AN boltsMS fastenersNACE MR0175 studsstress corrosion cracking resistantprecipitation hardening fasteners
PH 13-8 Metallurgy & Fastener Advantages
Precipitation Hardening
PH 13-8 Mo fasteners derive their strength from aging heat treatment. After solution annealing (Condition A), fasteners are aged at 950°F to 1150°F (510°C to 620°C) to precipitate fine intermetallic compounds (NiAl) within the martensitic matrix. This yields ultimate tensile strengths from 170 ksi to 220 ksi with excellent ductility and fracture toughness.
Key Fastener Benefits
Ultra-high strength: up to 220 ksi (1517 MPa) UTS.
Outstanding toughness: superior to many high-strength alloys.
Stress corrosion cracking resistant: excellent performance in marine, H₂S, and chloride environments.
High fatigue strength: ideal for cyclic loading.
Good ductility: elongation 10-18% depending on temper.
PH 13-8 Mo bolts manufactured to ASME B18.2.1, ASME B18.3 (socket head), DIN 931, DIN 912, ISO 4014, ISO 4762, NAS1351, NAS1352, AN bolts (AN3-AN20), MS20073, MS20074, and more. Available in hex head, socket head, carriage, and specialty head styles. Thread classes 2A, 3A, UNJF-3A, 6g. Supplied in Condition A, then aged to H950, H1000, or H1025 per customer PO.
PH 13-8 Mo Nuts
PH 13-8 Mo nuts including hex nuts (ASME B18.2.2), heavy hex nuts, jam nuts, slotted nuts, self-locking nuts, and custom configurations. Compliant with AN315, AN316, MS21045, MS21046, NAS1291, and DIN 934, DIN 985. Available in all tempers. 100% thread inspection. Optional cadmium plating, silver plating, or passive finish.
PH 13-8 Mo Screws
PH 13-8 Mo screws in pan head, flat head, socket cap, and set screw styles. Conforming to MS16995, MS16998, MS24693, NAS560, NAS561, DIN 7984, ISO 7380. Precision rolled threads. Custom drive options (hex, Torx, Phillips) available.
PH 13-8 Mo Washers
PH 13-8 Mo washers in flat, fender, split lock, tooth lock, and custom shapes. Made to NAS620, AN960, MS20002, DIN 125, ISO 7089. Sizes from #0 to 3" and metric M2 to M64. Precision stamped or machined.
PH 13-8 Mo Stud Bolts
PH 13-8 Mo stud bolts with full thread or centerless ground. Conforming to ASTM A564, API 20F, API 6A, NACE MR0175. Double-end, continuous thread, or custom lengths. Upset ends available. Supplied with matching nuts and washers.
PH 13-8 Mo Threaded Rods
PH 13-8 Mo threaded rods in 3-foot, 6-foot, 12-foot lengths or cut-to-size. Precision rolled or cut threads. Suitable for high-strength tie rods, tension applications, and structural connections.
Manufacturing Standards for PH 13-8 Mo Fasteners
RAYCHIN LIMITED manufactures PH 13-8 Mo fasteners to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
PH 13-8 Mo Fastener Styles
PH 13-8 Mo 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
PH 13-8 Mo Bolts
Hex Head Bolts Shoulder Bolts Wedge Anchor Bolts
• DIN 931 • DIN 933 • ISO 4014 • ISO 4017 • ISO 7370
PH 13-8 Mo 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
PH 13-8 Mo Studs/Rod
Studs Threaded Rod Weld Studs
• DIN 975 • DIN 976
PH 13-8 Mo Washers
Flat Washers Lock Washer
• DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091 • DIN 127 / ISO 7090 • DIN 9021 / ISO 7093
PH 13-8 Mo Hose Clamps
Medium Duty Hose Clamps
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PH 13-8 Mo Screws
12 Point Screws
PH 13-8 Mo 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
PH 13-8 Mo 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
PH 13-8 Mo 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
PH 13-8 Mo 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
PH 13-8 Mo 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 PH 13-8 Mo 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.
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Set Screws
PH 13-8 Mo 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
PH 13-8 Mo 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
PH 13-8 Mo 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.
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PH 13-8 Mo Bolts
Hex Head Bolts
PH 13-8 Mo 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
PH 13-8 Mo 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
PH 13-8 Mo wedge anchor bolts offer a safe secure fastening solution for attaching equipment and other materials to concrete in corrosive environments.
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PH 13-8 Mo Nuts
Hex Nuts
PH 13-8 Mo 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
PH 13-8 Mo 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
PH 13-8 Mo Studs & Threaded Rod
Studs
PH 13-8 Mo studs are fully threaded or partially threaded and made to custom lengths.
• ASME B18.31.2 • DIN 976
Threaded Rod
PH 13-8 Mo 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
PH 13-8 Mo 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.
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PH 13-8 Mo Washers
Flat Washers
PH 13-8 Mo 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
PH 13-8 Mo 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 PH 13-8 Mo Fasteners
UNS S138001.4534ASTM A564AMS 5629AMS 5864XM-1213-8 PH05Cr13Ni8Mo2Al
Chemical Composition (Weight %) – PH 13-8 Mo (UNS S13800 / 1.4534)
Our PH 13-8 Mo fasteners are produced from certified heats conforming to ASTM A564 / AMS 5629. The precise balance of elements ensures consistent age-hardening response and mechanical properties.
Element
ASTM A564 / AMS 5629 (Range %)
Typical (analysis)
Chromium (Cr)
12.25 – 13.25
12.8
Nickel (Ni)
7.50 – 8.50
8.1
Molybdenum (Mo)
2.00 – 2.50
2.2
Aluminum (Al)
0.90 – 1.35
1.1
Carbon (C)
≤ 0.05
0.03
Manganese (Mn)
≤ 0.10
0.05
Silicon (Si)
≤ 0.10
0.05
Phosphorus (P)
≤ 0.010
0.008
Sulfur (S)
≤ 0.008
0.003
Nitrogen (N)
≤ 0.01
0.005
Iron (Fe)
Balance
Balance
Expert note: The low carbon, high purity (≤0.008% S, ≤0.010% P) and aluminum addition promote precipitation of fine NiAl intermetallics during aging, yielding ultra-high strength without sacrificing toughness or corrosion resistance.
Complete Mechanical Properties of PH 13-8 Mo Fasteners (per ASTM A564 / AMS 5629)
PH 13-8 Mo fasteners are supplied in solution annealed Condition A (1000-1050°C, air cooled or faster) and may be aged by the customer or RAYCHIN to various tempers. Minimum mechanical properties for common tempers are shown below.
Minimum Mechanical Properties – Various Tempers
Temper / Condition
Heat Treatment
Tensile Strength (ksi) [MPa]
Yield Strength 0.2% (ksi) [MPa]
Elongation %
Reduction of Area %
Hardness (HRC)
Condition A (solution annealed)
As annealed
125-150 [860-1035]
85-110 [585-760]
15
45
≤ 32
H950 (510°C)
Aged at 950°F ±10°F (510°C) for 4h
220 [1517]
205 [1413]
10
40
44-48
H1000 (540°C)
Aged at 1000°F ±10°F (540°C) for 4h
205 [1413]
190 [1310]
12
45
42-46
H1025 (550°C)
Aged at 1025°F ±10°F (550°C) for 4h
185 [1275]
170 [1172]
13
48
39-43
H1050 (565°C)
Aged at 1050°F ±10°F (565°C) for 4h
170 [1172]
150 [1034]
14
50
36-40
H1100 (595°C)
Aged at 1100°F ±10°F (595°C) for 4h
145 [1000]
115 [793]
16
52
32-36
H1150 (620°C)
Aged at 1150°F ±10°F (620°C) for 4h
135 [931]
95 [655]
18
55
28-34
Physical Properties & Elevated Temperature Performance
PH 13-8 Mo retains good strength at moderately elevated temperatures, though it is not considered a high-temperature alloy like superalloys. Maximum service temperature is typically 315-370°C (600-700°F) for aged conditions; above this, overaging may occur. Data for hot hardness and tensile retention:
PH 13-8 Mo offers excellent corrosion resistance, similar to Type 304 stainless steel in many environments, and superior resistance to stress corrosion cracking compared to other high-strength alloys such as 17-4 PH or 15-5 PH.
Environment
Performance
Comments
General Corrosion
Good
Similar to 304 in mild media
Stress Corrosion Cracking (SCC)
Excellent
Superior resistance in chloride and H₂S environments; qualifies for NACE MR0175 up to 22 HRC (H1150 temper) for sour service.
Pitting / Crevice Corrosion
Moderate-good
Molybdenum addition improves resistance
Atmospheric / Marine
Excellent
Widely used in naval applications
Hydrogen Embrittlement
Low susceptibility
When properly processed and aged
NACE MR0175 / ISO 15156 compliance: PH 13-8 Mo is acceptable for sour service in the H1150 temper (maximum hardness 34 HRC) and double-aged conditions. Our NACE-compliant fasteners undergo strict hardness and heat treatment control.
Standards Compliance & Manufacturing
RAYCHIN LIMITED manufactures PH 13-8 Mo fasteners to all major standards:
NASANMSANSIASTMASMESAEAPINACEISODINKSJISGB
In-house capabilities: precision CNC machining, thread rolling, heat treatment (vacuum furnaces), passivation, and 100% inspection. Full traceability per EN 10204 3.1. Third-party inspections (ABS, DNV, Lloyds) available upon request.
Special focus: PH 13-8 Mo Fasteners for Critical Applications
Our PH 13-8 Mo fasteners are trusted by leading aerospace, defense, and energy companies. We supply:
Aerospace: NAS1351 socket head cap screws, NAS620 washers, AN hex bolts, MS21045 locknuts.
Oil & Gas: API 6A stud bolts, NACE-compliant nuts, threaded rods for BOP stacks.
Defense: MIL-S-25043 compliant bolts, custom fasteners for naval vessels.
Nuclear: Grade 1, 2, 3 bolting materials, certified to ASME Section III.
Custom: Special shoulder bolts, step studs, and non-standard threads.
All PH 13-8 Mo fasteners are supplied with material test reports, PMI verification, and dimensional inspection. Aging (H950, H1000, H1025, H1050, H1100, H1150) performed to precise time/temperature cycles.
Why RAYCHIN LIMITED – The PH 13-8 Mo Fastener Authority
Metallurgical Expertise
In-house metallurgists ensure proper solution annealing and aging response for every batch. We verify microstructure and mechanical properties to meet stringent aerospace and oil & gas requirements. All material is PMI tested for chemistry verification.
Global Approvals & Traceability
ISO 9001:2015, AS9100D certified. Our quality system meets NAS, AN, MS, ASTM, ASME, API, NACE, and customer-specific requirements. Full traceability from melt to finished fastener. Certifications include EN 10204 3.1/3.2.
Precision Heat Treating
Vacuum furnaces with ±5°F uniformity ensure consistent aging to H950, H1000, H1025, H1050, H1100, H1150. Computer-controlled cycles with digital chart recorders included in certification package.
Custom Capabilities
Need a special head style, non-standard length, or unusual thread? Our engineers collaborate to design and manufacture custom PH 13-8 Mo fasteners per your drawing. Quick-turn prototyping available.
Contact the PH 13-8 Mo fastener experts today
Request a quote for PH 13-8 Mo bolts, nuts, screws, washers, stud bolts, threaded rods – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about high-strength fasteners for aerospace, defense, oil & gas, or custom applications.
