Machine Screws

Precision Pan Head Screws in Special Alloys | RAYCHIN Fastening Solution Expert

The Versatile Choice for Countless Assemblies

RAYCHIN is a premier manufacturer of high-performance pan head screws and a recognized special alloy fastening solution expert. The pan head screw, characterized by its slightly domed top and flat bearing surface with a rounded side profile, is one of the most versatile and widely used fastener head styles in the world. Its design provides a larger recess depth than round head screws, allowing for higher torque transmission and a clean, finished appearance. These screws are fundamental components in aerospace, medical devices, electronics, automotive, industrial machinery, and consumer products.

We engineer these precision components from over 25 advanced alloys, ensuring reliable performance in corrosive environments, high-temperature applications, cryogenic conditions, vacuum systems, and high-wear assemblies. Our pan head screws are manufactured to exacting ASME, DIN, ISO, and JIS standards, with complete material certification, full traceability, and engineering support for custom applications.

Pan Head Screw Classifications

1. Standard Pan Head Screw Standards

2. Drive Types Available

3. Special Application Pan Head Screws

• Pan Head Thread-Forming Screws: For plastics, composites, and soft metals

• Pan Head Thread-Cutting Screws: For creating threads in metal applications

• Pan Head Screws with Captive Washer: Integrated washer for enhanced load distribution

• Pan Head Screws with Nylon Patch: Self-locking for vibration-prone applications

• Pan Head Security Screws: Tamper-resistant drive configurations

• Pan Head Sealing Screws: With O-ring or bonded seal for environmental protection

• Pan Head Shoulder Screws: Precision shoulder for alignment applications

• Micro Pan Head Screws: For miniature electronics and precision instruments

• Custom Pan Head Designs: Manufactured to your OEM specifications with unique head dimensions, drive configurations, thread forms, and material grades

Full Material Portfolio with International Standard Designations

As a special alloy fastening solution expert, RAYCHIN produces pan head screws in the following comprehensive range of high-performance materials:

1. Precipitation-Hardening Stainless Steels

• 17-4 PH (UNS S17400): ASTM A564 Type 630, AMS 5643, DIN 1.4542 — Available in H900, H1025, H1150, H1150+ tempers. Exceptional combination of high strength (up to 180 ksi) and good corrosion resistance. Minimal distortion during heat treatment. Ideal for aerospace components, medical devices, high-strength electronics, and defense hardware. *Keywords: 17-4 PH pan head screws, 17-4 PH pan head machine screws.*

• PH 13-8 Mo (UNS S13800): ASTM A564 Type 625, AMS 5629 — Superior strength, exceptional toughness, and outstanding stress corrosion cracking resistance. Available in H950, H1000, H1050 tempers. Recommended for aerospace structural components, defense applications, medical implants, and high-security assemblies. *Keywords: PH 13-8 Mo pan head screws, PH 13-8 Mo pan head fasteners.*

2. Nickel-Based Superalloys

Inconel® Alloys:

• Inconel 600 (UNS N06600): ASTM B166, AMS 5665 — General purpose high-temperature alloy with excellent oxidation and corrosion resistance to 2000°F. Good resistance to chloride stress corrosion cracking. Ideal for heat treat furnaces, chemical processing equipment, nuclear applications, and thermal processing fixtures. Keywords: Inconel 600 pan head screws.

• Inconel 625 (UNS N06625): ASTM B446, AMS 5666 — Exceptional resistance to pitting, crevice corrosion, and high-temperature oxidation. Outstanding fatigue strength and resistance to chloride ions. Recommended for marine hardware, offshore platforms, chemical tank enclosures, and seawater immersion applications. Keywords: Inconel 625 pan head machine screws.

• Inconel 718 (UNS N07718): AMS 5663, ASTM B637 — High-strength alloy with exceptional creep rupture strength up to 1300°F. Excellent cryogenic properties and weldability. Ideal for aerospace engine components, high-temperature electronics, downhole tool assemblies, and racing applications. Keywords: Inconel 718 pan head screws, Inconel 718 pan head fasteners.

Monel® Alloys:

• Monel 400 (UNS N04400): ASTM B164, AMS 4675 — Superior resistance to seawater, steam, and caustic environments. Excellent corrosion resistance in reducing conditions. High strength over a wide temperature range. Recommended for marine electronics, naval hardware, chemical processing equipment, and offshore installations. Keywords: Monel 400 pan head screws.

• Monel K500 (UNS N05500): ASTM B865, AMS 4676 — Age-hardenable version offering increased strength and hardness while maintaining excellent corrosion resistance. Good spring properties. Ideal for pump components, marine fasteners, oil & gas applications, and high-strength marine hardware. Keywords: Monel K500 pan head machine screws.

Hastelloy® Alloys:

• Hastelloy C276 (UNS N10276): ASTM B574, AMS 5754 — Excellent resistance to a wide range of corrosive chemicals including strong oxidizers and reducing agents. Outstanding resistance to pitting and stress corrosion cracking. Recommended for chemical reactor enclosures, pharmaceutical equipment, pollution control systems, and flue gas desulfurization. Keywords: Hastelloy C276 pan head screws.

• Hastelloy C22 (UNS N06022): ASTM B574, AMS 5755 — Superior resistance to oxidizing media and localized corrosion. Excellent in mixed acid environments and chloride-containing media. Ideal for bleaching systems, pickling equipment, nuclear waste processing, and aggressive chemical service. Keywords: Hastelloy C22 pan head fasteners.

• Hastelloy B2 (UNS N10665): ASTM B335 — Exceptional resistance to reducing acids like hydrochloric and sulfuric at all concentrations and temperatures. Outstanding resistance to hydrogen chloride gas. Recommended for hydrochloric acid processing, chemical reactors, evaporators, and acid concentration plants. Keywords: Hastelloy B2 pan head screws.

Incoloy® Alloys:

• Incoloy 825 (UNS N08825): ASTM B423, AMS 5870 — Excellent resistance to reducing and oxidizing acids, stress corrosion cracking, and intergranular attack. Good resistance to sulfuric and phosphoric acids. Ideal for pickling tank hardware, pollution control equipment, nuclear fuel reprocessing, and chemical storage vessels. Keywords: Incoloy 825 pan head screws.

• Incoloy 925 (UNS N09925): ASTM B805 — High-strength, age-hardenable alloy with excellent resistance to sour gas environments. Good corrosion resistance and mechanical properties. Recommended for downhole instrumentation, wellhead equipment, subsea enclosures, and oil & gas production. Keywords: Incoloy 925 pan head machine screws.

High-Temperature Alloys:

• Waspaloy (UNS N07001): AMS 5708, AMS 5824 — Precipitation-hardenable alloy with exceptional high-temperature strength to 1600°F. Excellent oxidation and creep resistance. Good fatigue strength. Ideal for gas turbine enclosures, jet engine components, high-temperature instrumentation, and aerospace fasteners. Keywords: Waspaloy pan head screws.

• Nimonic® Series:

  • Nimonic 80A (UNS N07080): BS HR 501, AMS 5842 — Creep and rupture strength up to 1500°F. Excellent oxidation resistance and good corrosion resistance. Recommended for exhaust system hardware, heat treatment fixtures, turbocharger components, and gas turbine parts. Keywords: Nimonic 80A pan head screws.

  • Nimonic 90 (UNS N07090): BS HR 502, AMS 5796 — Enhanced high-temperature properties with superior oxidation resistance. Good creep strength and fatigue resistance. Ideal for gas turbine blades, high-temperature springs, aerospace engine hardware, and high-performance racing components. Keywords: Nimonic 90 pan head machine screws.

3. Duplex & Super Duplex Stainless Steels

• Duplex 2205 (UNS S32205/S31803): ASTM A193 B8S, EN 1.4462 — Twice the yield strength of 316 stainless with excellent chloride stress corrosion resistance. Outstanding pitting resistance (PREN 34-36). Recommended for offshore platform electronics, desalination plant hardware, marine deck equipment, and chemical tankers. Keywords: Duplex 2205 pan head screws.

• Super Duplex Alloys:

  • Alloy 926 (UNS N08926): ASTM B691, EN 1.4529 — PREN >40 for severe chloride and seawater environments. Excellent resistance to crevice corrosion and pitting. Ideal for subsea enclosures, coastal infrastructure, chemical tanker hardware, and desalination plants. Keywords: Alloy 926 pan head screws.

  • AL-6XN® (UNS N08367): ASTM B691, AMS 5875 — Superior pitting and crevice corrosion resistance in highly chlorinated atmospheres. Outstanding resistance to seawater and chloride solutions. Recommended for flue gas desulfurization, seawater cooling systems, pharmaceutical equipment, and food processing. *Keywords: AL-6XN pan head machine screws.*

4. Titanium Alloys

• Grade 2 Titanium (UNS R50400): ASTM B348, AMS 4921 — Excellent corrosion resistance with good formability and weldability. Outstanding seawater resistance and biocompatibility. Ideal for marine electronics, architectural hardware, chemical processing equipment, and medical devices. Keywords: Titanium Grade 2 pan head screws.

• Grade 5 Titanium (Ti-6Al-4V) (UNS R56400): AMS 4928, ASTM F467 — High strength-to-weight ratio, excellent corrosion resistance, and biocompatibility. Available in annealed and aged conditions. Recommended for aerospace interiors, medical devices, surgical instruments, high-performance automotive components, and racing applications. *Keywords: Titanium Grade 5 pan head screws, Ti-6Al-4V pan head screws.*

• Grade 7 Titanium (UNS R52400): ASTM B348 — Superior corrosion resistance with palladium addition. Excellent in reducing and oxidizing acid environments. Ideal for chemical processing, desalination plants, pollution control equipment, and aggressive corrosion service. Keywords: Titanium Grade 7 pan head fasteners.

5. Refractory & Exotic Metals

• Tantalum (UNS R05200): ASTM B365, AMS 7845 — Ultimate corrosion resistance in aggressive acid environments. Completely inert to most chemicals. Excellent biocompatibility. Recommended for chemical reactor hardware, pharmaceutical processing equipment, high-purity applications, and medical implants. Keywords: Tantalum pan head screws.

• Zirconium 702 (UNS R60702): ASTM B550, ASME SB550 — Excellent resistance to sulfuric, hydrochloric, and nitric acids. Outstanding in organic acids and alkaline media. Ideal for nuclear fuel processing, chemical reactors, heat exchanger hardware, and aggressive chemical service. Keywords: Zirconium pan head screws.

• Molybdenum (UNS R03600): ASTM B387 — High temperature strength and stiffness for extreme thermal applications to 3000°F. Excellent thermal conductivity and low thermal expansion. Recommended for high-temperature furnaces, semiconductor processing equipment, glass manufacturing, and high-temperature fixtures. Keywords: Molybdenum pan head screws.

• Tungsten: ASTM B777 — Highest density and melting point for specialized radiation shielding and high-temperature applications. Exceptional wear resistance and thermal stability. Ideal for medical imaging equipment, aerospace counterweights, high-temperature fixtures, and radiation shielding. Keywords: Tungsten pan head machine screws.

6. Specialty Stainless Steels & Nickel Alloys

Nitronic® Alloys:

• Nitronic 50 (XM-19) (UNS S20910): ASTM A193 B8N — High strength, non-magnetic, excellent corrosion resistance. Twice the yield strength of 316 stainless. Good cryogenic properties. Recommended for medical imaging equipment, marine instrumentation, high-strength electronic enclosures, and aerospace components. Keywords: Nitronic 50 pan head screws.

• Nitronic 60 (UNS S21800): ASTM A193 B8N — Superior wear and galling resistance with good corrosion properties. Excellent for frequently accessed fasteners and moving parts. Ideal for valve components, pump hardware, adjustable mechanisms, and high-wear applications. Keywords: Nitronic 60 pan head screws, Nitronic 60 pan head fasteners.

High-Performance Stainless:

• 254 SMO (UNS S31254): EN 1.4547, ASTM A479 — Excellent seawater and chloride resistance with high PREN value (>42). Outstanding pitting and crevice corrosion resistance. Recommended for offshore electronics, desalination hardware, coastal architectural fasteners, and marine applications. Keywords: 254 SMO pan head screws.

• 310 Stainless Steel (UNS S31000): ASTM A276, AISI 310 — Outstanding high-temperature oxidation resistance up to 2000°F. Excellent in cyclic temperature conditions. Good carburization resistance. Ideal for furnace hardware, heat treat fixtures, exhaust system components, and high-temperature sensors. Keywords: 310SS pan head screws.

• Alloy 20 (Carpenter 20) (UNS N08020): ASTM B473 — Superior resistance to sulfuric acid and chloride stress corrosion. Excellent in mixed acid environments. Recommended for chemical processing equipment, pharmaceutical reactors, food processing hardware, and acid handling systems. Keywords: Alloy 20 pan head screws.

• Alloy 330 (UNS N08330): ASTM B536 — Excellent carburization and oxidation resistance at elevated temperatures. Good resistance to thermal fatigue. Ideal for industrial furnaces, heat treating equipment, petrochemical processing, and high-temperature fixtures. Keywords: Alloy 330 pan head machine screws.

7. Ultra-High-Strength Cobalt Alloys

• MP35N (UNS R30035): AMS 5844, ASTM F562 — Ultimate tensile strength exceeding 300 ksi with exceptional toughness and corrosion resistance. Non-magnetic. Excellent fatigue strength. Recommended for aerospace actuators, medical implants, downhole instrumentation, high-security fasteners, and marine applications. Keywords: MP35N pan head screws.

• MP159 (AMS 5846): Advanced cobalt-nickel alloy offering high strength and creep resistance at elevated temperatures. Superior to MP35N in high-temperature applications. Ideal for gas turbine hardware, aerospace engine components, high-performance racing fasteners, and critical high-temperature assemblies. Keywords: MP159 pan head machine screws.

8. High-Strength Aluminum & Iron-Based Alloys

• Aluminum 7075 (UNS A97075): AMS QQ-A-225/9, ASTM B211 — Available in T6, T73, T76 tempers. High strength-to-weight ratio with good corrosion resistance. Excellent machinability. Recommended for aerospace interiors, portable electronics, defense hardware, high-performance automotive components, and sports equipment. Keywords: Aluminum 7075 pan head screws.

• A286 (UNS S66286): AMS 5731, ASTM A453 Grade 660 — Iron-based superalloy with excellent high-temperature strength and oxidation resistance to 1300°F. Good cryogenic properties and corrosion resistance. Ideal for aerospace engine hardware, turbocharger components, high-temperature electronic enclosures, and racing applications. Keywords: A286 pan head screws.

9. Pure Nickel

• Nickel 200/201 (UNS N02200/N02201): ASTM B160, ASME SB160 — High purity and excellent corrosion resistance in caustic environments. Good thermal and electrical conductivity. Non-magnetic. Recommended for caustic processing equipment, electronic components, food processing hardware, and alkali service. Keywords: Nickel 200 pan head screws.

Custom Pan Head Screw Manufacturing & Engineering Solutions

As a special alloy fastening solution expert, RAYCHIN provides complete custom pan head screw manufacturing services tailored to your exact specifications:

Manufacturing Capabilities

Engineering & Design Services

• Material Selection Expertise: Our metallurgists analyze your application environment — temperature range (-423°F to 2200°F), corrosive media exposure, load requirements, magnetic permeability needs, and conductivity requirements — and recommend the optimal alloy from our 25+ material portfolio.

• Drive System Optimization: We evaluate torque requirements (measured in in-lbs or N-m), access constraints, assembly automation requirements, and security needs to recommend the ideal drive configuration — slotted, Phillips, Pozidriv®, hex socket, Torx®, or custom tamper-resistant designs.

• Head Geometry Customization: We can modify head diameter, height, and crown radius to meet specific bearing area requirements, clearance constraints, or aesthetic preferences.

• Thread Form Engineering: Standard unified (UNC/UNF/UNEF), metric (ISO coarse/fine), or custom thread forms including:

  • ACME threads for linear motion

  • Buttress threads for high thrust loads

  • Whitworth (BSW/BSF) for legacy applications

  • BA (British Association) for instrumentation

  • Multi-start threads for rapid assembly

  • Asymmetric threads for specialty applications

• Prototype Development: Rapid turnaround prototype quantities (as few as 5 pieces) for design validation, fit-checking, and functional testing prior to full production.

Quality Assurance & Certification

• Material Certification: Complete Material Test Reports (MTRs) to EN 10204 3.1/3.2 with full traceability to melt source

• Dimensional Inspection: CMM, optical comparator, vision system, and laser micrometry verification to customer specifications

• Mechanical Testing: Tensile, yield, hardness, torque-to-failure, drive tool compatibility, and push-out testing

• Metallurgical Analysis: Microstructure examination, case depth verification, grain size determination, and intergranular attack testing

• Non-Destructive Testing: Liquid penetrant (FPI), magnetic particle (MPI), eddy current, and ultrasonic inspection as required

• Corrosion Testing: Salt spray (ASTM B117), intergranular corrosion (ASTM A262), and stress corrosion cracking testing

• Process Certification: AS9100, ISO 9001, ISO 13485, ITAR, NADCAP, and PED compliant

Industry Applications & Engineering Recommendations

Why Choose RAYCHIN as Your Fastening Solution Expert?

25+ Years of Material Science Leadership:

Our metallurgical engineering team possesses deep expertise across the full spectrum of superalloys, refractory metals, and specialty stainless steels. We maintain a comprehensive database of material properties, corrosion resistance data, and application performance records. We don't just manufacture fasteners — we engineer solutions optimized for your specific application environment.

Complete Vertical Integration:

From raw material sourcing and certification through manufacturing, heat treatment, surface finishing, and quality inspection, all processes are performed in-house under strict quality control. This vertical integration ensures:

• Consistent quality from lot to lot

• Complete traceability from melt source to finished product

• Rapid response to design changes

• Competitive pricing without supply chain markups

• Shorter lead times for prototype and production quantities

Engineering Partnership:

We view ourselves as an extension of your engineering team. Our fastener engineers provide:

• Technical consultation on material selection based on application requirements

• Design optimization for manufacturability and performance

• Drive system specification for torque and assembly requirements

• Installation methodology recommendations

• Failure analysis and corrective action support

Global Standards Compliance:

Our products meet or exceed ASTM, ASME, DIN, ISO, JIS, BS, GB, NACE, and MIL-SPEC specifications, ensuring acceptance in regulated industries and global supply chains. We maintain current knowledge of international standards and can provide certification for any required specification.

Supply Chain Reliability:

We maintain strategic raw material inventory across our 25+ alloy portfolio, flexible manufacturing capacity, and robust quality systems to ensure consistent on-time delivery for both prototype quantities (5-100 pieces) and high-volume production runs (100,000+ pieces).

Sustainability Commitment:

We are committed to responsible material sourcing, energy-efficient manufacturing, and waste reduction. Our quality systems include:

• Conflict minerals compliance (due diligence per OECD guidelines)

• REACH and RoHS compliance for European markets

• Environmental management (ISO 14001 principles)

• Recycling and waste reduction programs

Technical Specifications & Ordering Information

Standard Size Ranges

Thread Specifications

Available Finishes

Request Engineering Consultation & Quote

Contact RAYCHIN's special alloy fastening solution experts today with your specifications or CAD drawings. We provide confidential technical consultation, rapid response prototyping, and competitive pricing for standard and custom pan head screw solutions in advanced alloys.

Email: sales@ray-chin.com
Web:www.ray-chin.com
Response Time: < 24 hours
Engineering Support: Available in English, Mandarin, German, and Spanish
Prototype Turnaround: 5-10 business days
Production Lead Time: 3-6 weeks depending on quantity and alloy

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