17-4 PH Flat Head Screws
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 applciaitons
· Up to 4x stronger than 316 stainless steel
· Maintains its mechanical strength up to 600°F
· 17-4PH Chemistry & Specifications
· 17-4PH flat head screw features and benefits
· 17-4PH Datasheet
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17-4 PH Flat Head Screws: Countersunk, 82°, 90°, Slotted, Phillips, Torx & Custom Configurations
RAYCHIN LIMITED is a recognized expert in 17-4 PH flat head screws — from 17-4 PH countersunk flat head screws, 17-4 PH 82° flat head screws, 17-4 PH 90° flat head screws, 17-4 PH slotted flat head screws, 17-4 PH Phillips flat head screws, 17-4 PH Torx flat head screws to custom non-standard flat head screw configurations. The flat head (countersunk) design allows for flush mounting in countersunk holes, providing a smooth surface finish. Our portfolio includes flat head screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for extreme environments: aerospace, automotive, electronics, medical devices, and marine industries where high temperature resistance, corrosion protection, and flush surfaces are critical. 17-4 PH flat head screws are available in all heat treatment conditions with precision rolled threads and full traceability.
Complete Range of 17-4 PH Flat Head Screws
82° Flat Head Screws (Inch Series)
17-4 PH 82° flat head screws for inch series countersunk holes. Manufactured to ANSI B18.6.3 and NAS specifications. The 82° head angle is standard for inch system applications in aerospace and defense. Available with slotted, Phillips, or Torx drives. Ideal for flush mounting requirements in aircraft structures, electronic enclosures, and military equipment. Sizes from #0 to 1" with full traceability.
90° Flat Head Screws (Metric Series)
17-4 PH 90° flat head screws for metric series countersunk holes. Manufactured to DIN 963, DIN 964, ISO 2009, and ISO 2010 specifications. The 90° head angle is standard for metric applications worldwide. Available with slotted, Phillips, or Torx drives. Ideal for flush mounting in automotive, electronics, and industrial equipment. Sizes from M2 to M24 with full traceability.
Slotted Flat Head Screws
17-4 PH slotted flat head screws featuring a single slot drive for traditional screwdriver applications. Manufactured to ANSI B18.6.3, DIN 963 (metric 90°), and ISO 2009 specifications. The slotted drive provides simplicity and universal tool compatibility. Ideal for applications where Phillips or other drives are not required. Available in all standard sizes with full traceability.
Phillips Flat Head Screws
17-4 PH Phillips flat head screws with cross-recessed drive for positive driver engagement and reduced cam-out compared to slotted drives. Manufactured to ANSI B18.6.3, DIN 964 (metric 90°), and ISO 2010 specifications. Available with Phillips #0 through #4 drive sizes. Ideal for automated assembly lines and applications requiring higher installation torque.
Torx Flat Head Screws
17-4 PH Torx flat head screws with hexalobular drive for maximum torque transmission and cam-out resistance. Manufactured to customer specifications with Torx drive sizes T6 through T60. The Torx drive provides superior torque transfer and extended tool life. Ideal for high-vibration applications and where tamper resistance is required. Security Torx variants with center pin available.
Aerospace & Military Flat Head Screws
17-4 PH flat head screws manufactured to NAS, AN, and MS specifications including NAS 500 series, MS 24693, MS 24694, MS 51957, and AN 507. Available with UNJF-3A threads per MIL-S-8879 for enhanced fatigue life. Shot peened per aerospace requirements and available with silver or cadmium plating for anti-galling. Full traceability with material certification and third-party testing available.
Flat Head (Countersunk) Design Advantages for 17-4 PH Screws
Flush Mounting
The flat head design allows the screw to sit flush with or below the surface when installed in a countersunk hole, providing a smooth finish.
Aerodynamic Surfaces
Critical for aerospace applications where flush surfaces reduce drag and improve aerodynamic performance. Widely used in aircraft skin panels.
Snag-Free Design
Flush mounting eliminates protruding heads that could snag on clothing, moving parts, or other equipment. Ideal for consumer products and safety-critical applications.
Head Angle Options
Available in 82° (inch series) and 90° (metric series) to match standard countersink angles worldwide. Custom angles available for special applications.
Manufacturing Standards for 17-4 PH Flat Head Screws
RAYCHIN LIMITED manufactures 17-4 PH flat head screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
International Standards & Global Designations for 17-4 PH Flat Head Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures 17-4 PH flat head screws from material conforming 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 ASTM A193 GR.630 ASTM F593 GR.630 AMS 5643 1.4542 SUS630 UNS S17400 NACE MR0175 17-4PH
Chemical Composition (Weight %) – 17-4 PH Precipitation Hardening Stainless Steel
Our 17-4 PH flat head screws 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. 17-4 PH is up to 4x stronger than 316 stainless steel. All raw material is positively identified by PMI (Positive Material Identification) and certified with mill test reports.
Complete Mechanical Properties of 17-4 PH Flat Head Screws (by Heat Treatment per ASTM A564/A564M)
17-4 PH flat head screws are available in 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 the material (longitudinal direction) per ASTM A564 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 (NACE MR0175 approved)
Condition H1150D (620°C + 620°C / 1150°F + 1150°F) – Double aged, improved properties (NACE MR0175 approved)
Additionally, 17-4 PH flat head screws exhibit excellent fracture toughness and very high fatigue strength. Our test certificates include actual values from each production lot. For sour service (NACE MR0175), H1150M or H1150D conditions are recommended for optimal sulfide stress corrosion cracking resistance.
High Temperature Performance of 17-4 PH Flat Head Screws
17-4 PH stainless steel maintains excellent mechanical properties up to 316°C (600°F), making it ideal for high-temperature applications in aerospace, power generation, and automotive systems.
Temperature-Dependent Strength Retention (Condition H900)
17-4 PH maintains its mechanical strength up to 600°F (316°C), with good properties retained even at higher temperatures. For continuous service above 400°C, special heat treatments or alternative alloys should be considered. Avoid long-term exposure to temperatures between 370-480°C to prevent loss of toughness at ambient temperature.
Thermal Stability Limits
Corrosion Resistance of 17-4 PH Flat Head Screws
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 Resistance
Critical Corrosion Considerations for Flat Head Screws
- Sensitization: Aging above 495°C can cause chromium carbide precipitation at grain boundaries, leading to chromium depletion and increased susceptibility to intergranular corrosion. However, 17-4 PH is generally less susceptible to sensitization than conventional martensitic grades due to low carbon content.
- Optimal Aging: Specimens aged at 460°C for 2h or 480°C for 4h demonstrate minimal signs of sensitization and very low degrees of sensitization in DL-EPR tests.
- NACE MR0175 Compliance: For sour service applications, only H1150M and H1150D double-aged conditions are permitted with maximum hardness of 28 HRC.
- Comparison to 304: 17-4 PH offers comparable corrosion resistance to 304 stainless steel in many environments, with significantly higher strength (up to 4x stronger than 316).
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, H1150M for maximum stress corrosion cracking resistance). Third-party corrosion testing per ASTM G31, G48, or G61 available upon request. NACE MR0175 compliant flat head screws available in H1150M and H1150D conditions.
Special focus: 17-4 PH Flat Head Screws for Aerospace & Electronics Applications
For critical applications requiring flush mounting and reliable performance, RAYCHIN offers 17-4 PH flat head screws manufactured to NAS, MS, DIN, ISO, and customer-specific specifications. Our capabilities include:
- Aerospace Standards: NAS 500 series, MS 24693, MS 24694, MS 51957, AN 507
- International Standards: DIN 963 (slotted 90°), DIN 964 (Phillips 90°), ISO 2009 (slotted), ISO 2010 (Phillips)
- Head Angles: 82° (inch series), 90° (metric series), custom angles available
- Drive Types: Slotted, Phillips #0-4, Torx, combo drive, Pozidriv
- Thread Specifications: UNJF-3A per MIL-S-8879, metric MJ threads, standard UNRC/UNRF and metric coarse/fine
- Surface Treatments: Silver plating per AMS 2410, cadmium plating per AMS 2400, passivation per AMS 2700
- High Temperature: Continuous service up to 316°C (600°F) with retained mechanical properties
- Sour Service (NACE MR0175): H1150M and H1150D double-aged conditions with hardness ≤ 28 HRC
- Custom: Special head angles, unusual drive depths, and custom thread combinations per customer drawings
All 17-4 PH flat head screws are supplied in conditions H900 through H1150D, with full traceability and third-party NDT upon request.
Why RAYCHIN LIMITED – The 17-4 PH Flat Head Screw 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 flat head screws. Every heat is verified by in-house testing.
Global approvals & traceability
Our quality system is ISO 9001:2015 and AS9100D 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.
Precision cold heading
In-house precision cold heading and CNC machining ensure consistent head angle and drive recess formation. Full head angle inspection available with optical comparators. Countersink depth controlled to ±0.001".
Custom solutions
Need a special head angle, unusual drive combination, or custom thread length? Our cold heading and CNC turning departments handle short runs with agility. We also provide specialized coatings and corrosion testing per aerospace requirements.
Contact the 17-4 PH flat head screw experts today
Request a quote for 17-4 PH 82° flat head screws, 90° flat head screws, slotted flat head screws, Phillips flat head screws, Torx flat head screws & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any condition, any quantity. Inquire about high temperature or NACE MR0175 sour service 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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