High-precision equipment (such as precision machine tools, semiconductor equipment, medical precision instruments, and automated testing equipment) has extremely strict requirements for transmission components—precision, stability, corrosion resistance, and cleanliness are indispensable. Among numerous transmission parts, stainless steel double end stud have become the preferred choice for high-precision equipment due to their excellent material properties and optimized structural design.
Stainless Steel Material: The Core Foundation for Adapting to High-Precision Environments
The service environment of high-precision equipment is often harsh—most of them work in clean rooms, humid environments, or occasions with slight corrosion, and have strict requirements for rust prevention and dust-free. Ordinary carbon steel lead screws are prone to rust and iron chips, which will directly damage the transmission precision and cause equipment failure. The core characteristics of stainless steel (commonly used 304/316/440C) perfectly solve these pain points, which is also the key reason why it is superior to other materials.
Excellent Rust and Corrosion Resistance, Ensuring Long-Term Precision Stability
304/316 stainless steel contains chromium and nickel elements, which can form a dense chromium oxide passive film on the surface. This passive film can effectively isolate moisture, weak acid and weak alkali in the environment, preventing the lead screw from rusting and corrosion. Unlike galvanized/chromium-plated carbon steel lead screws, the anti-rust layer of stainless steel will not peel off, avoiding the increase of fit clearance between the lead screw and the nut caused by rust, and ensuring that the transmission precision does not decay after thousands of hours of operation.
According to the 2025 industry test data, 304 stainless steel lead screws can maintain no rust and no precision loss after 20,000 hours of continuous operation in a humid environment (humidity 80%-90%), while carbon steel lead screws will have obvious rust spots and precision attenuation of more than 15% after 5,000 hours of operation under the same conditions. For high-precision equipment that requires long-term stable operation, this advantage is irreplaceable.
High Cleanliness and No Secondary Pollution, Meeting Strict Industry Standards
Semiconductor, medical, food testing and other high-precision equipment have extremely high requirements for dust-free and impurity-free. Stainless steel double-headed lead screws are made of high-quality cold-rolled/forged materials, with uniform internal structure and no loose impurities. After precision processing, there will be no chip shedding or rust peeling, which will not pollute the workpiece or internal components of the equipment, and fully meet the standards of Class 1000/10000 clean rooms.
For example, in the production process of semiconductor chips, the stainless steel 304 double-headed lead screws used in the precision slide table of the lithography machine need to meet the food-grade clean standard. After electrolytic polishing, the surface roughness Ra≤0.4μm, which can avoid chip pollution and ensure the yield of chips.
High Hardness and Wear Resistance, Balancing Rust Prevention and Service Life
Many people have a misunderstanding that stainless steel is “soft” and not wear-resistant. In fact, for high-precision equipment, the selected stainless steel lead screws have undergone special processing to achieve a good balance between rust prevention and wear resistance: 440C martensitic stainless steel can reach HRC58~62 after quenching, which is close to the hardness of carbon steel after quenching and tempering, and its wear resistance is equivalent to that of carbon steel lead screws, while retaining the rust prevention characteristics; 304/316 austenitic stainless steel can improve surface hardness through cold working hardening, meeting the needs of high-precision transmission under medium and low loads, and balancing toughness and wear resistance.
Double Ended Bolts Structure: Perfectly Matching the Transmission and Installation Needs of High-Precision Equipment
The “double end threaded stud screw bolt” refers to a lead screw with threads at both ends and a transmission thread section in the middle. Its structural design is highly matched with the modular installation, coaxiality requirements, and bidirectional positioning/transmission needs of high-precision equipment. Compared with single-headed lead screws, it has obvious structural advantages, which can further reduce assembly errors and improve transmission precision.
High-Precision Coaxial Installation, Reducing Assembly Error Accumulation
The threads at both ends of the stainless steel double-headed lead screw are processed with high-precision coaxiality, which can be directly connected with the fixed end, drive end or executive component of the equipment without additional couplings or positioning sleeves. The assembly coaxiality error can be controlled within 0.01~0.05mm/m, avoiding lead screw deflection and transmission jamming caused by assembly deviation, and ensuring the overall transmission precision of the equipment.
Taking the precision machine tool fine-tuning mechanism as an example, the use of stainless steel double-headed lead screws can reduce the assembly error by 40% compared with single-headed lead screws, and the positioning precision of the machine tool can be improved from 0.01mm to 0.005mm, which is crucial for the processing of high-precision parts.
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Post time: Jan-30-2026