- Torx screw,torx machine screw,torx self tapping screw
- sales@jlfastener.com
torx socket head cap screw
Torx machine screw
torx socket head cap screw
- Description：torx socket head cap screw
I. Stainless Steel: Graded Response to Humidity Challenges from Daily Use to Salt Spray Environments
The core value of stainless steel lies in its "corrosion resistance", but the corrosion resistance and cost of different grades vary significantly, requiring graded selection based on the humidity of the scenario. As the "mainstay for daily corrosion resistance", 304 stainless steel contains 18% chromium and 8% nickel. The density of its oxide film is sufficient to handle over 90% of civil humid scenarios. For example, in the fixation of bathroom mirror cabinets—where the humidity around the cabinet often reaches 60%-80%—304 stainless steel screws can resist moisture for a long time, and their silvery-white appearance matches the hardware of the mirror cabinet. Even for built-in kitchen ovens, where the surrounding temperature reaches 80-120℃ during operation, 304 stainless steel still maintains stable performance. Oil stains can be cleaned with a rag without special maintenance.
316 stainless steel is "exclusive to salt spray environments". The addition of molybdenum increases its corrosion resistance by more than 3 times. In the installation of garden street lamps in coastal areas, the salt concentration carried by sea breeze reaches 500-1000ppm, and ordinary stainless steel will show rust spots within one month. However, 316 stainless steel can remain free of rust for 500 hours in salt spray environments, ensuring the stability of lamp brackets. For deck accessories (such as handrails and sunshade fixation) of small yachts, which are in long-term contact with seawater, 316 stainless steel screws can resist seawater erosion, preventing safety hazards caused by accessory falling due to screw rust.
201 stainless steel is positioned as an "economic compromise" with a nickel content of only 1%-3%. Although its corrosion resistance is inferior to that of 304, its cost is reduced by 30%-40%, making it suitable for "light moisture protection" scenarios in dry indoor environments. For example, in the fixation of clothes rails in bedroom wardrobes—the internal humidity of the wardrobe is usually below 40% with no direct moisture contact—201 stainless steel screws can meet the service demand for 5-8 years. Meanwhile, they reduce furniture manufacturing costs, making them suitable for mass-produced furniture brands like IKEA.
II. Carbon Steel: Compensating for Shortcomings with Technology, Becoming the "Cost-Effective Champion" for High-Strength Scenarios
The core advantage of carbon steel is its "high strength + low cost", but its weak corrosion resistance needs to be compensated by surface treatment, forming a combined solution of "base material + technology". After modulation treatment (quenching at 850℃ + tempering at 550℃), Q235 carbon steel reaches a hardness of HRC 30-45 and a tensile strength of over 500MPa, which is sufficient to withstand mechanical vibration and structural impact. In the connection of small machine tool shells—where the vibration frequency of the machine tool reaches 50-100Hz during operation—carbon steel screws disperse vibration loads to the shell surface through the uniform stress area of the cylindrical head, avoiding shell deformation caused by local stress concentration. In the scenario of anti-theft door hinge fixation, the impact force when opening and closing the door reaches 100-200N, and carbon steel screws can withstand more than 10,000 impacts without breaking, with a cost only 1/3 of that of 304 stainless steel.
Surface treatment is the "key to completing carbon steel's performance": hot-dip galvanizing has a coating thickness of 80-100μm, with strong corrosion resistance, suitable for outdoor balcony guardrail fixation and capable of resisting rain erosion for 3-5 years; cold galvanizing has a coating thickness of 20-30μm, with low cost, suitable for indoor office desk metal bracket fixation and usable for 2-3 years in dry environments; nickel plating balances aesthetics and corrosion resistance, with a nickel layer thickness of 5-10μm and a bright surface, suitable for microwave oven control panel fixation. It not only improves the texture of home appliances but also resists slight moisture in daily use.
III. Alloy Steel: Born for Extreme Working Conditions, Breaking Through Performance Ceilings
Alloy steel is the "performance ceiling" of cylindrical-head inner plum blossom machine screws. By adding alloying elements, it achieves a triple breakthrough of "high-temperature resistance, high impact resistance, and high wear resistance", specially designed for industrial extreme scenarios. 40CrNiMoA alloy steel contains chromium, nickel, and molybdenum. After modulation, its tensile strength exceeds 1000MPa and impact toughness reaches 80J/cm², enabling stable operation in the temperature range of -40℃ to 150℃. In the automotive engine compartment—where the temperature reaches 120-150℃ during engine operation, accompanied by high-frequency vibration of 200-300Hz—ordinary screws will loosen due to material fatigue within 3-6 months. However, 40CrNiMoA alloy steel screws can maintain tightness for a long time, ensuring that components such as sensors and engine covers do not fall off.
In the hydraulic system of construction machinery, the working pressure of hydraulic valve groups exceeds 30MPa, and hydraulic oil has strong corrosiveness. Alloy steel screws can resist oil erosion and pressure impact, preventing valve group leakage. In the scenario of fixing ore conveyors of large mining machinery—where ore friction and heavy loads (single equipment load reaches 10-20 tons) have high requirements for screw wear resistance—vanadium-containing alloy steel (such as 40CrV) has finer grains, with wear resistance increased by 50%. It can extend the equipment maintenance cycle to 1-2 years, reducing downtime losses.
IV. Copper Alloy: Focusing on Electrical and Thermal Conductivity, Becoming the "Exclusive Fastener" for Electronic Scenarios
The core competitiveness of copper alloy lies in "electrical conductivity + thermal conductivity". Different grades are optimized for the segmented needs of electronic scenarios, making them "essential" for precision electronic equipment. H62 brass contains 62% copper, with a conductivity of 90% IACS, suitable for low-current and low-heat scenarios. In the fixation of circuit boards and power terminals, brass screws can reduce current transmission loss (loss rate below 1%) to ensure stable circuit conduction. When fixing router antenna interfaces, the conductivity of brass can assist signal transmission, reducing signal attenuation by 5%-10% and improving network stability.
QSn6.5-0.1 phosphor bronze adds tin and phosphorus to brass, enhancing elasticity and corrosion resistance, suitable for electronic scenarios requiring frequent disassembly or in humid environments. In the fixation of smartphone battery connectors, the elasticity of phosphor bronze screws ensures tight fitting between the connector and the battery—even if the phone is dropped and deformed by 0.1-0.2mm, poor contact will not occur. In the fixation of humidifier control boards, phosphor bronze can resist 80%-90% humidity, avoiding rust that affects circuit conduction.
QBe2 beryllium bronze is "exclusive to high-end electronic scenarios", containing 2% beryllium. It has a tensile strength of over 1200MPa, and is non-magnetic and fatigue-resistant, suitable for aerospace and medical equipment. In the fixation of micro-sensors in the aerospace field, beryllium bronze screws can maintain stability in environments of -60℃ to 120℃ and high-frequency vibration (500-1000Hz), ensuring sensor data transmission error below 0.1%. In the internal connection of MRI machines, the non-magnetic property of beryllium bronze will not interfere with the instrument's magnetic field (magnetic field strength reaches 1.5-3.0T), and its corrosion resistance can meet the long-term erosion of disinfectants such as alcohol and iodophor.
The material selection of cylindrical-head inner plum blossom machine screws is essentially a "matching game between scenario needs and material performance": for humid scenarios, prioritize stainless steel grades (316＞304＞201); for high-strength scenarios, choose carbon steel + surface treatment; for extreme working conditions, use alloy steel; for electronic scenarios, select copper alloy. This "on-demand selection" logic allows these small screws to not only play a silent role in daily home use but also take on the "tightening responsibility" in high-end industrial scenarios, becoming an indispensable "basic component" in the production and manufacturing of various industries.