Product Center · Anti-loosening Series

Multifunctional Sealing & Anti-Loosening Screw

Sealing and anti-loosening screw supplied through the spring range: 65Mn spring steel for preload, stainless where corrosion matters.

Key specifications

MaterialSpring Steel 65Mn / Stainless Steel 304
Installationthreaded in, coating filling the clearance
StandardGB/T 197, GB/T 4208 (IP rating)
Typical substratehousing threads and end caps
Key inspectionsleak tightness, coating coverage, prevailing torque

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Product overviewOverview

A pre-applied sealant targets the thread clearance. 65Mn is quenched and tempered for good elasticity at low cost but needs zinc or black oxide in damp conditions. Austenitic stainless resists corrosion but has no magnetic response and a lower modulus, so the same deflection gives less preload and a steel part cannot simply be swapped for it.

Material: Spring Steel 65Mn / Stainless Steel 304. It is threaded in so the coating fills the thread clearance.

Key featuresFeatures

65Mn and stainless are not interchangeable at the same deflection.
Coating fills the helical thread clearance, blocking weepage along the thread.
Provides locking as well, so no separate locking element is needed.
Applied in production, so the assembly line needs no sealant and no cure wait.

Typical applicationsApplications

Engine and gearbox housing threads
EV drive unit housings
Hydraulic valve and pump bodies

Selection notesSelection

For corrosive service choose stainless and recalculate deflection for the lower modulus; for high preload at low cost use 65Mn with zinc plating, but not in marine air.

Frequently asked questionsFAQ

Can stainless directly replace a 65Mn part?

Not directly. Austenitic stainless has roughly nine tenths the modulus of carbon steel, so the same compression gives less preload; deflection or geometry has to change to keep sealing and locking performance.

What matters during installation of the Multifunctional Sealing & Anti-Loosening Screw?

Thread it in so the coating fills the thread clearance. 65Mn and stainless are not interchangeable at the same deflection.

Specifications

Material	Spring Steel 65Mn / Stainless Steel 304
Surface Treatment	Zinc-plated / Black oxide
Standard	GB/T 197, GB/T 4208 (IP rating)
Installation	threaded in, coating filling the clearance
Typical substrate	housing threads and end caps
Key inspections	leak tightness, coating coverage, prevailing torque

Manufacturing and inspection

Coverage and thickness are checked microscopically, with gauging to confirm the coating does not block the thread.We recommend a pilot assembly at the actual torque and mating part before locking the process parameters for volume.