RAYCHIN LIMITED

Superior Torque Transfer

The Torx drive provides more points of contact than other drives, allowing higher installation torque without damaging the recess. The vertical walls of the Torx design transfer torque more efficiently, reducing wear on driver bits and extending tool life. This is particularly important in high-temperature and corrosive environments where reliable fastening is critical.

Reduced Cam-Out

The star-shaped pattern eliminates the cam-out problem common with Phillips drives, providing positive driver engagement even under high torque. This ensures consistent installation torque and prevents damage to the screw head during assembly or disassembly in difficult working conditions.

Extended Tool Life

The Torx drive design reduces wear on driver bits compared to other drive systems, providing longer tool life and more consistent torque application during assembly. The 15-degree drive angle and vertical side walls distribute forces evenly, minimizing bit wear.

Available Head Styles

Incoloy Torx screws are available in multiple head styles to suit various applications: button head for low-profile smooth appearance, flat head for flush mounting, and pan head for general purpose fastening. All styles feature precision-formed Torx drives for maximum torque transfer.

Incoloy 800 (UNS N08800 / 1.4876)

High-Temperature General Purpose: Nickel-iron-chromium alloy with excellent oxidation and carburization resistance up to 815°C. Good creep strength and resistance to sigma phase embrittlement. Ideal for heat exchangers, furnace components, and petrochemical applications. Minimum tensile strength: 585 MPa, yield strength: 240 MPa.

Incoloy 800H (UNS N08810 / 1.4958)

Enhanced High-Temperature Strength: Higher carbon content (0.05-0.10%) provides improved creep and rupture strength. Excellent performance up to 1150°C. Preferred for applications requiring long-term high-temperature stability such as ethylene furnace tubes and steam generators. Maintains structural integrity at extreme temperatures.

Incoloy 800HT (UNS N08811 / 1.4959)

Optimized High-Temperature Performance: Controlled chemistry with aluminum and titanium additions for enhanced creep resistance. Maximum service temperature up to 1150°C. Superior performance in cyclic temperature applications. Ideal for industrial furnace components, radiant tubes, and high-temperature structural fasteners.

Incoloy 825 (UNS N08825 / 2.4858)

Acid & Chloride Resistance: Nickel-iron-chromium alloy with molybdenum (2.5-3.5%) and copper (1.5-3%) additions. Exceptional resistance to sulfuric and phosphoric acids. Resists 40% H₂SO₄ at 100°C with <0.05mm/year corrosion rate. Ideal for chemical processing, acid storage, and marine applications. Maximum service temperature: 540°C in acid service.

Incoloy 925 (UNS N09925)

Sour Service Specialist: Precipitation-hardenable alloy with titanium additions (1.9-2.4%) providing significantly higher strength through aging. Excellent resistance to sulfide stress cracking in H₂S environments. Yield strength 760-965 MPa in aged condition. Ideal for oil & gas downhole tools, sour gas well equipment, and high-strength corrosion-resistant fasteners. Qualified per NACE MR0175.

Dimensional Standards

Our Incoloy Torx screws meet or exceed the following specifications:

Available in UNC, UNF, UNJF-3A, and metric coarse/fine thread configurations. Drive sizes from T6 to T60.

Material Specifications by Grade

• Incoloy 800: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
• Incoloy 800H: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
• Incoloy 800HT: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
• Incoloy 825: ASTM B424 / ASME SB424, ASTM B423, NACE MR0175
• Incoloy 925: ASTM B805, API 6A, NACE MR0175

Surface Finish Options

• Passivated: Per ASTM A967 for maximum corrosion resistance
• Electropolished: For clean room and pharmaceutical applications
• PTFE Coated: For anti-galling and lubricity
• Silver Plating: Per AMS 2410 for high-temperature anti-seize

Exceptional High-Temperature Strength (800 Series)

Incoloy 800H and 800HT maintain useful strength up to 1150°C. At 900°C, tensile strength remains 130-180 MPa, significantly higher than 316H. Excellent creep rupture strength at 1000°C with 20-25 MPa for 1000 hours.

Superior Acid Resistance (825)

Incoloy 825 Torx screws resist 40% H₂SO₄ at 100°C with <0.05mm/year corrosion rate. Excellent performance in phosphoric acid service, including wet process phosphoric acid containing fluoride impurities.

Sour Service Excellence (925)

Incoloy 925 Torx screws offer yield strength up to 760 MPa in aged condition with exceptional resistance to sulfide stress cracking. Qualified per NACE MR0175 for H₂S environments up to 425°C.

Superior Torque Transfer

The Torx drive provides more points of contact than other drives, allowing higher installation torque without damaging the recess. Resists cam-out, extends tool life, and provides better torque transfer between driver and fastener.

Chloride SCC Immunity

With high nickel content (30-46%), Incoloy Torx screws have excellent resistance to chloride stress corrosion cracking, making them ideal for marine environments and brackish water applications.

Multiple Head Styles

Available in button head, flat head, and pan head configurations to suit specific application requirements. All styles feature precision-formed Torx drives for positive engagement and maximum torque transfer.