Loctite · In stock in Dubai

Loctite 277

Name: Loctite 277
Brand: Loctite
SKU: Loctite 277

High strength, red. For large threads above M20.

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Product details

Grade	Loctite 277
Strength	High strength
Colour	Red
Family	Threadlockers
Brand	Loctite (Henkel)
Stock	Held in Dubai — buy one or bulk

Pack sizes

Pack	Format
50 ml	bottle

Prices on request. Tell us the quantity you need.

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What Loctite 277 is for

The high-strength red grade built for large fasteners — bolts and studs M25 and above. It is high viscosity, so it stays in the coarse threads of big fasteners instead of draining out, and it permanently locks and seals against shock and vibration. Disassembly needs localised heat to about 250°C.

Key features

High strength — permanent locking, heat needed to disassemble
High viscosity, suited to large threads on bolts and studs M25 and above
Fluoresces under UV light for inspection
Tested to the lot requirements of Mil-S-46163A (a regional approval)
Full strength retained after 1,000 h in motor oil at 125°C
Cold strength tested to −75°C

Typical applications

Large bolts
Structural fasteners

Technical data

Uncured material

Technology	Acrylic
Chemical type	Dimethacrylate ester
Appearance	Red liquid
Fluorescence	Positive under UV light
Components	One component — no mixing
Cure	Anaerobic; secondary cure by activator
Viscosity	Medium to high
Viscosity, Brookfield RVT 25°C	Spindle 4 at 20 rpm: 6,000–8,000 mPa·s
Specific gravity at 25°C	1.12

Torque performance

M10 steel nuts and bolts, after 24 hours at 22°C.

Breakaway torque (ISO 10964)	32 N·m (280 lb·in)
Prevail torque (ISO 10964)	32 N·m (280 lb·in)
Breakloose torque, pre-torqued to 5 N·m	38 N·m (340 lb·in)
Max. prevail torque, pre-torqued to 5 N·m	40 N·m (350 lb·in)
Compressive shear strength (ISO 10123)	≥9 N/mm² (≥1,300 psi)

Chemical resistance

Breakloose torque as a percentage of initial strength after ageing.

Environment	°C	100 h	500 h	1,000 h
Motor oil (MIL-L-46152)	125	100%	100%	100%
Unleaded petrol	22	100%	100%	100%
Brake fluid	22	100%	100%	100%
Water / glycol 50:50	87	90%	90%	90%
Acetone	22	95%	95%	95%
Ethanol	22	95%	95%	95%
Sodium hydroxide 10%	40	100%	100%	70%
Hydrochloric acid 10%	40	100%	100%	100%

Cured material

Coefficient of thermal expansion (ISO 11359-2)	80 × 10⁻⁶ K⁻¹
Thermal conductivity (ISO 8302)	0.1 W/(m·K)
Specific heat	0.3 kJ/(kg·K)
Heat ageing data published to	150°C
Cold strength	Tested to −75°C

How to use it

Clean all threads, internal and external, with a Loctite cleaning solvent and allow to dry.
Shake the bottle thoroughly before use.
Do not let the nozzle touch metal — it makes the product cure in the tip.
Thru holes: apply several drops onto the bolt at the nut engagement area.
Blind holes: apply several drops down the internal threads to the bottom of the hole.
Sealing: apply a 360° bead to the leading male threads, leaving the first thread free, and work it into the thread roots.
Assemble and tighten to the specified torque within the fixture time.

Handling and storage

Not recommended for pure oxygen or oxygen-rich systems.
Not a sealant for chlorine or other strong oxidising materials.
Not normally recommended on plastics — thermoplastics can stress-crack.
On passive metals (stainless, aluminium, plated) or below 5°C, use Loctite SF 7471 or SF 7649 activator to bring the cure speed up.
Store unopened and dry. Henkel gives optimal storage as 8°C to 21°C; outside 8–28°C the product properties can be affected.
Do not return decanted product to the original container.
Disassembly: apply localised heat to about 250°C and take the joint apart while hot.

Loctite 277 or 270?

Both are high-strength red grades that need heat to release. 277 is the high-viscosity version, formulated for the coarse threads of large bolts and studs M25 and above, where a thinner grade would run out of the thread before it cured. On normal fastener sizes use 270. Where the joint must be serviceable with hand tools, do not use either — specify 243.