stainless steel slotted screws are fasteners with threads on both ends and usually a threadless rod in the middle. The M2-M5 specifications are suitable for electronic equipment, precision instruments, and small mechanical assemblies. Its core functions are composed of the following parts.
1. Basic functional characteristics
Dual connection mechanism
External thread: realize screwing fixation with nuts or threaded holes (standard metric/imperial threads)
Internal thread: provide additional connection points on the top
Typical applications: LED lighting bracket installation, stacking fixation of mechanical parts
Slotted design: slot depth 0.5-1.2mm, slot width 2.5-6mm; the advantage is that the dustproofness is better than the cross slot, suitable for outdoor equipment.
2. Characteristics of stainless steel
304 stainless steel: resistant to the acid-base cycle of pH3-11
316 stainless steel: resistant to chloride ion corrosion
Surface treatment: optional passivation/electrolytic polishing
Mechanical properties
Tensile strength: 500-700MPa, equivalent to carbon steel grade 8.8
Working temperature: -50℃ to 250℃, up to 300℃ in a short term
3. Special application functions
Sealing combination scheme: internal threads can be equipped with sealing plugs, and external threads can be equipped with copper washers to achieve IP68 protection.
Electrical conduction characteristics: resistivity <0.73Ω·m, the preferred solution for grounding terminals of telecommunications base stations.
4. Key points for engineering selection
Size matching principle: external thread length ≥2 times the pitch, internal thread depth ≥1.5 times the screw diameter.
Preload control: M6 specification recommends torque 4.5-5.5N·m, and thread glue is required to prevent loosening.
V. Maintenance Recommendations
1. Check the tightening status regularly, especially for applications in vibration environments
2. Avoid using corrosive cleaning agents when cleaning
3. It is recommended to use 316 stainless steel for long-term exposure environments
4. Proper use of stainless steel internal and external thread screws can ensure connection reliability and durability, especially for precision assembly occasions that require two-way fixation.
