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Durlok Self-Locking Fasteners: Unbrako Vibration-Proof System | Unbrako pneumatic product available at Shri Narayan Machinery LLP Noida
Unbrako

Durlok Self-Locking Fasteners: Unbrako Vibration-Proof System

When vibration walks your bolts loose, Durlok is the mechanical fix: Unbrako's patented self-locking screws, nuts, and washers build an interference fit into the thread engagement zone itself. No nylon insert to wear out, no thread-locker to cure or degrade; the lock survives -50°C to over 300°C and passes the DIN 65151 Junker vibration test with zero preload loss. Screws are Grade 12.9 at 1,220 N/mm² minimum tensile strength, in M6 to M20 socket head and hex head styles. Because the lock is mechanical, it stays reusable through repeated assembly-disassembly cycles, so maintenance-heavy joints stop consuming thread-locker. Railway bogies, crushers, compressors, and conveyor drives across NCR run on these. Stocked at Sector 9, Noida; WhatsApp for price.

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Property Class (Screws): 12.9Min. Ultimate Tensile Strength: 1,220 N/mm²Locking Mechanism: Patented mechanical thread interference, reusableMaterial: Alloy Steel, Quenched & Tempered

Key Features

Patented mechanical self-locking thread, prevents loosening under vibration
Grade 12.9, 1,220 N/mm² minimum ultimate tensile strength
Reusable locking feature, does not diminish with repeated assembly/disassembly
Temperature independent, maintains lock from sub-zero to 300°C+
No chemical thread-lockers required, eliminates adhesive costs and cure times
System approach: matching Durlok screws, nuts, and washers work together
Passes Junker vibration test (DIN 65151) with zero preload loss
Alloy steel with black oxide finish, same Unbrako metallurgical quality
E-Code traceability on all Durlok components

Technical Specifications

Property Class (Screws)12.9
Min. Ultimate Tensile Strength1,220 N/mm²
Locking MechanismPatented mechanical thread interference, reusable
MaterialAlloy Steel, Quenched & Tempered
FinishBlack Oxide (standard)
Operating Temperature-50°C to 300°C+
Vibration TestPasses DIN 65151 (Junker test) with zero preload loss
Size RangeM6, M8, M10, M12, M14, M16, M18, M20
System ComponentsDurlok Screws, Durlok Nuts, Durlok Washers

Applications

The Durlok Self-Locking Fasteners is used across a wide range of industrial applications:

  • Railway rolling stock, bogie assemblies, brake systems, coupling mechanisms
  • Automotive engines, cylinder head studs, flywheel bolts, turbo manifold fasteners
  • Wind turbines, tower bolting, nacelle assemblies, gearbox mounts
  • Mining and earthmoving equipment, vibration-exposed structural joints
  • Compressors and pumps, flange bolting on reciprocating machinery
  • Conveyor drives, gearbox mounting, coupling bolts, motor bases
  • Defence vehicles, hull fasteners, turret assemblies, weapons mounts
  • Construction equipment, excavator boom pins, track links, hydraulic fittings

Industries Served

Railway & MetroAutomotive & Auto ComponentsWind EnergyMining & EarthmovingDefence & MilitaryHeavy MachineryOil & GasConstruction Equipment

Need Durlok Self-Locking Fasteners? Get the Best Dealer Price

As your Unbrako dealer, Shri Narayan Machinery LLP offers competitive pricing on the full Durlok Self-Locking Fasteners range. Call us for availability and your best quote.

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C-101, Sector 9, Noida, Uttar Pradesh 201301 | Unbrako Dealer

Frequently Asked Questions: Durlok Self-Locking Fasteners

Durlok uses a patented mechanical interference fit in the thread engagement zone. Unlike nylon-insert lock nuts that wear out or chemical thread-lockers that degrade at high temperatures, Durlok's mechanical locking feature is built into the thread form itself. It creates a positive lock that holds clamp load even under severe transverse vibration, as proven by the DIN 65151 Junker vibration test.

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