RAYCHIN LIMITED

Cup Point (DIN 916 / ISO 4026)

The most commonly used set screw style, featuring a cup-shaped indentation on the end. The cup point edge cuts into the shaft or inner object, providing excellent resistance to rotational slippage. Ideal for quick, semi-permanent or permanent assembly applications in high-temperature and corrosive environments. Available in sizes from M2 to M24 and #0 to 1".

Cone Point (DIN 914 / ISO 4027)

Features a sharp cone-shaped point that provides the strongest clamping force due to deep penetration into the mating surface. The cone point creates a positive locking action that prevents loosening under severe vibration and thermal cycling. Ideal for permanent assembly applications where maximum holding power is required in extreme environments.

Flat Point (DIN 913 / ISO 4028)

Features a flat, smooth bottom surface. This style is used when frequent adjustment or disassembly is required and minimal shaft deformation is desired. The flat point does not mar the mating surface, allowing for repeated repositioning. Ideal for applications requiring precise alignment and frequent maintenance in corrosive environments.

Half-Dog Point (DIN 915 / ISO 4029)

Features a cylindrical projection that fits into a matching hole in the shaft, providing positive positioning and maximum resistance to axial movement. The half-dog point is ideal for applications requiring precise location and where the set screw must withstand thrust loads. Ideal for high-temperature and corrosive applications where positive positioning is critical.

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 furnace components, heat exchangers, and high-temperature processing equipment. 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, steam generators, and high-temperature vacuum furnaces. 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 set screws meet or exceed the following specifications:

Available in UNC, UNF, and metric coarse/fine thread configurations. Drive sizes from hex socket or slotted.

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
• As-Formed: Clean finish

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 set 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 set 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.

Multiple Point Styles

Cup point for maximum holding power, cone point for permanent assembly, flat point for adjustable applications, half-dog point for positive positioning. Each point style is precision formed for consistent performance.

Chloride SCC Immunity

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

Precision Socket Drive

Deep, accurate hex sockets allow for maximum key engagement and torque transfer without cam-out. Available with standard hex and slotted drive options.