Machine Screws

Precision Truss Head Machine Screws in Special Alloys | RAYCHIN Fastening Solution Expert

Meta Description: RAYCHIN manufactures high-performance truss head machine screws in 25+ exotic alloys: 17-4 PH, Inconel 718, Titanium, Hastelloy, Monel, MP35N, A286 & more. ASME B18.6.3, DIN 966, ISO 1580 compliant. Custom OEM truss head screws for aerospace, marine, medical & electronics. Global supplier.

Truss Head Machine Screws: Engineered for Superior Load Distribution & Low-Profile Fastening

RAYCHIN is a premier manufacturer of truss head machine screws and a recognized special alloy fastening solution expert. Truss head screws, also known as mushroom head screws or oven head screws, feature an extra-wide, low-profile domed head that provides a larger bearing surface than pan or round head screws while maintaining a minimal profile height. This unique geometry distributes clamping forces over a wider area, prevents pull-through in thin materials, and eliminates snagging hazards. These screws are essential in electronics enclosures, appliance manufacturing, marine hardware, aerospace interiors, automotive assemblies, medical devices, and architectural applications where load distribution, appearance, and safety are equally critical.

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 truss head machine screws are manufactured to exacting ASME, DIN, ISO, and JIS standards, with complete material certification, full traceability, and engineering support for custom applications.

Truss Head Machine Screw Classifications

1. Standard Truss Head Machine Screws:

2. Drive Types Available:

3. Special Application Truss Head Screws:

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

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

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

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

• Truss Head Security Screws: Tamper-resistant drive configurations

• Truss Head Shoulder Screws: Precision shoulder for alignment applications

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

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

Full Material Portfolio with International Standard Designations

As a special alloy fastening solution expert, RAYCHIN produces truss head machine 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. Excellent combination of high strength (up to 180 ksi), good corrosion resistance, and minimal distortion during heat treatment. Ideal for aerospace interiors, medical devices, and high-strength electronics enclosures. *Keywords: 17-4 PH truss head screws, 17-4 PH mushroom head 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 defense applications, aerospace structural components, and high-security assemblies. *Keywords: PH 13-8 Mo truss head screws, PH 13-8 Mo oven head screws.*

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. Ideal for heat treat furnaces, chemical processing equipment, and nuclear applications. Keywords: Inconel 600 truss head screws.

• Inconel 625 (UNS N06625): ASTM B446, AMS 5666 — Exceptional resistance to pitting, crevice corrosion, and high-temperature oxidation. Outstanding fatigue strength. Recommended for marine hardware, offshore platforms, and chemical tank enclosures. Keywords: Inconel 625 truss 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. Ideal for aerospace engine components, high-temperature electronics, and downhole tool assemblies. Keywords: Inconel 718 truss head screws, Inconel 718 mushroom head screws.

Monel® Alloys:

• Monel 400 (UNS N04400): ASTM B164, AMS 4675 — Superior resistance to seawater, steam, and caustic environments. Excellent corrosion resistance in reducing conditions. Recommended for marine electronics, naval hardware, and chemical processing equipment. Keywords: Monel 400 truss head screws.

• Monel K500 (UNS N05500): ASTM B865, AMS 4676 — Age-hardenable version offering increased strength and hardness while maintaining excellent corrosion resistance. Ideal for pump shafts, marine fasteners, and oil & gas applications. Keywords: Monel K500 truss 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, and pollution control systems. Keywords: Hastelloy C276 truss head screws.

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

• Hastelloy B2 (UNS N10665): ASTM B335 — Exceptional resistance to reducing acids like hydrochloric and sulfuric at all concentrations and temperatures. Recommended for hydrochloric acid processing, chemical reactors, and evaporators. Keywords: Hastelloy B2 truss 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. Ideal for pickling tank hardware, pollution control equipment, and nuclear fuel reprocessing. Keywords: Incoloy 825 truss head screws.

• Incoloy 925 (UNS N09925): ASTM B805 — High-strength, age-hardenable alloy with excellent resistance to sour gas environments. Recommended for downhole instrumentation, wellhead equipment, and subsea enclosures. Keywords: Incoloy 925 truss 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. Ideal for gas turbine enclosures, jet engine components, and high-temperature instrumentation. Keywords: Waspaloy truss head screws.

• Nimonic® Series:

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

  • Nimonic 90 (UNS N07090): BS HR 502, AMS 5796 — Enhanced high-temperature properties with superior oxidation resistance. Ideal for gas turbine blades, high-temperature springs, and aerospace engine hardware. Keywords: Nimonic 90 truss 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. Recommended for offshore platform electronics, desalination plant hardware, and marine deck equipment. Keywords: Duplex 2205 truss 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. Ideal for subsea enclosures, coastal infrastructure, and chemical tanker hardware. Keywords: Alloy 926 truss head screws.

  • AL-6XN® (UNS N08367): ASTM B691, AMS 5875 — Superior pitting and crevice corrosion resistance in highly chlorinated atmospheres. Outstanding resistance to seawater. Recommended for flue gas desulfurization, seawater cooling systems, and pharmaceutical equipment. *Keywords: AL-6XN truss 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. Ideal for marine electronics, architectural hardware, and chemical processing equipment. Keywords: Titanium Grade 2 truss 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, and high-performance automotive components. *Keywords: Titanium Grade 5 truss head screws, Ti-6Al-4V mushroom 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, and pollution control equipment. Keywords: Titanium Grade 7 truss 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. Recommended for chemical reactor hardware, pharmaceutical processing equipment, and high-purity applications. Keywords: Tantalum truss 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, and heat exchanger hardware. Keywords: Zirconium truss head screws.

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

• Tungsten: ASTM B777 — Highest density and melting point for specialized radiation shielding and high-temperature applications. Exceptional wear resistance. Ideal for medical imaging equipment, aerospace counterweights, and high-temperature fixtures. Keywords: Tungsten truss 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. Recommended for medical imaging equipment, marine instrumentation, and high-strength electronic enclosures. Keywords: Nitronic 50 truss head screws.

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

• 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, and coastal architectural fasteners. Keywords: 254 SMO truss 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. Ideal for furnace hardware, heat treat fixtures, and exhaust system components. Keywords: 310SS truss 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, and food processing hardware. Keywords: Alloy 20 truss 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, and petrochemical processing. Keywords: Alloy 330 truss 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. Recommended for aerospace actuators, medical implants, downhole instrumentation, and high-security fasteners. Keywords: MP35N truss 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, and high-performance racing fasteners. Keywords: MP159 truss 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. Recommended for aerospace interiors, portable electronics, defense hardware, and high-performance automotive components. Keywords: Aluminum 7075 truss 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. Ideal for aerospace engine hardware, turbocharger components, and high-temperature electronic enclosures. Keywords: A286 truss 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. Recommended for caustic processing equipment, electronic components, and food processing hardware. Keywords: Nickel 200 truss head screws.

Custom Truss Head Machine Screw Manufacturing & Engineering Solutions

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

Manufacturing Capabilities:

Engineering & Design Services:

• Material Selection Expertise: Our metallurgists analyze your application environment — temperature, corrosion exposure, load requirements, magnetic permeability — and recommend the optimal alloy from our 25+ material portfolio.

• Drive System Optimization: We evaluate torque requirements, access constraints, and security needs to recommend the ideal drive configuration — slotted, Phillips, 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 or clearance constraints.

• Thread Form Engineering: Standard unified (UNC/UNF), metric (ISO), or custom thread forms including Acme, buttress, and multi-start threads.

• Prototype Development: Rapid turnaround prototype quantities for design validation and 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, and vision system verification to customer specifications

• Mechanical Testing: Tensile, yield, hardness, torque, and drive tool compatibility testing

• Metallurgical Analysis: Microstructure examination, case depth verification, grain size determination

• Non-Destructive Testing: Liquid penetrant, magnetic particle, eddy current inspection as required

• 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 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 ensures consistent quality, traceability, and rapid response.

Engineering Partnership:
We view ourselves as an extension of your engineering team. Our fastener engineers provide technical consultation on material selection, design optimization, drive system specification, and installation methodology.

Global Standards Compliance:
Our products meet or exceed ASTM, ASME, DIN, ISO, JIS, BS, GB, and MIL-SPEC specifications, ensuring acceptance in regulated industries and global supply chains.

Supply Chain Reliability:
We maintain strategic raw material inventory, flexible manufacturing capacity, and robust quality systems to ensure consistent on-time delivery for both prototype quantities and high-volume production runs.

Sustainability Commitment:
We are committed to responsible material sourcing, energy-efficient manufacturing, and waste reduction. Our quality systems include conflict minerals compliance and environmental management.

Technical Specifications & Ordering Information

Standard Size Ranges:

• Diameter: #0 through 3/8" (UNified), M1.6 through M10 (Metric)

• Length: 1/8" through 4" (inch), 3mm through 100mm (metric)

• Head Diameter: ASME B18.6.3 standard or custom

• Head Height: ASME B18.6.3 standard or custom

Thread Specifications:

• Unified: Class 2A, 3A; UNC, UNF, UNEF

• Metric: Class 6g, 6h, 4h6h; Coarse and fine pitch

• Special: ACME, Buttress, Whitworth, BA, custom forms

Available Finishes:

• Passivation: ASTM A967, AMS 2700

• Electropolishing: Enhanced corrosion resistance, mirror finish

• Anodizing: Type II, Type III for aluminum and titanium

• Plating: Silver, nickel, zinc, cadmium (specification controlled)

• Coating: PTFE, Xylan®, Teflon®, MoS2

• Black Oxide: Military specification

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 truss head machine 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

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