Threadlocking adhesive — LOCTITE 276
LOCTITE 276 is a green, low-viscosity, single-component anaerobic threadlocker from LOCTITE, designed for permanent locking and sealing of threaded fasteners on metal. The product cures when isolated from air between close-fitting metal surfaces, thereby preventing movement, loosening, leaks, and corrosion from shock and vibration.
What the product does
- Provides permanent locking and sealing of threads through anaerobic curing.
- Suitable for metal substrates, including steel, brass, stainless steel, and nickel-plated surfaces.
- Develops high strength after curing and resists shock and vibration.
Application and workflow
The instructions in the manufacturer's technical data sheets specify concrete steps for assembly and disassembly. Briefly, the following procedures are described in the data sheets:
- Clean all surfaces (external and internal) with a LOCTITE cleaning agent and allow to dry.
- For slow curing, the surface can be treated with a recommended activator (e.g., Activator 7471™ or 7649™) and dried before application.
- For through bolts: apply several drops to the bolt at the nut engagement area.
- For blind holes: apply drops into the internal threads to the bottom of the hole.
- Assemble and tighten as required. For disassembly, local heating of the nut/bolt to approximately 250 °C is recommended before disassembling.
Typical applications
LOCTITE 276 is specified for permanent locking and sealing of threaded connections and is used precisely for this function on metal substrates as mentioned in the manufacturer's documentation. The product is recommended for situations where anaerobic curing between close-fitting metal parts is used.
Documentation
See data sheet from the manufacturer
Specifications
- Product name: LOCTITE 276
- Manufacturer: LOCTITE (Henkel)
- Manufacturer item number: 1266120
- Chemical type: Dimethacrylate ester
- Technology: Acrylic
- Appearance (uncured): Green liquid
- Viscosity: 380–620 mPa·s (Brookfield RVT, 25 °C, spindle 2, 20 rpm)
- Specific gravity: 1.05 @ 25 °C
- Curing type: Anaerobic, one-component
- Typical fixture time: 3–5 minutes
- Suitable for: metals including steel, brass, stainless steel, and nickel surfaces
- Breakaway torque (M10 steel nut/bolt, 24 h @22 °C): 60 N·m
- Prevail torque (M10 steel, 24 h @22 °C): 41 N·m
- Breakloose torque (preloaded 5 N·m): 55 N·m
- Compressive shear strength: ≥20 N/mm² (steel, after 24 h @22 °C)
- Glass transition temperature (Tg): 104 °C
- Optimal storage: 8 °C to 21 °C
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