Name: Tec-Bond® 235
Brand: Tectorius

Tec-Bond® 235 is a microencapsulated pre-applied thread adhesive that delivers reliable locking performance on male or female threaded fasteners of virtually all sizes, configurations, compositions, and finishes. Its microencapsulated reactive elements remain dormant in a quick-curing resin until fastener installation, requiring no heat or primers for cure activation.

The shearing forces generated during fastener installation rupture the microcapsules, releasing reactive compounds that cure into a tough, well-bonded polymer matrix. This matrix rapidly bonds mating surfaces, semi-permanently locking the joint and sealing leak paths.

Compatible with virtually all fastener sizes, finishes, and substrate types
No heat or primers required for cure activation.
Available in Industrial Grade (235-IN) and Precision Grade (235-PR).
Available in standard solvent-based formula and DPC (Dry Concentrate) variant with solvent removed for transport efficiency.
Pre-applied coating available for bulk fasteners at Tectorius licensed service centers and partners.

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Tec-Bond® 235 may be used as a direct replacement for 3M™Fastener Adhesive 2353, which has been discontinued. Read more here.

For a water-based, REACH and RoHS compliant alternative, see Tec-Bond®240

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Automotive: General assembly, body fasteners, after market components, powertrain subassembly.
Industrial Manufacturing: Electric motors, fluid power systems, home appliances.
Industrial Maintenance & Repair: Field service assemblies, remanufacturing operations.
Production Coating: Compatible with a broad range of automated and semi-automated production coating equipment.

Installation Torque: <10 in/lbs.

Break/Prevail Torque After Full Cure: 225/250 in/lbs. 25/28 Nm

Temperature Range: -65/300 °F -54/150°C

Fixture Time: >90 min

Standard Color: Sapphire

Specialty Colors: Yellow, Red, Green

On-Part Life: 4 years

Full Cure Time At Room Temperature: 72 hrs

Performance, Advantages and Benefits

Room-Temperature Cure: Tec-Bond® 235 cures fully at ambient temperature without requiring heat activation or primer pre-treatment, simplifying integration into existing assembly processes.
Microencapsulation Technology: Reactive elements remain dormant until fastener installation. This enables long on-part shelf life, dry-to-the-touch handling, and consistent activation at the point of assembly.
Automotive Fluid Resistance: Once fully cured,Tec-Bond® 235 resists and seals against most automotive fluids, including oil, water, antifreeze, and gasoline, maintaining joint integrity in demanding service environments.
Variety of Strengths, Colors, and Viscosities: Available in multiple colors for easy part inspection and in formulas suited to a wide range of production coating equipment, supporting quality control and manufacturing flexibility.
Production Coating Compatible: Available in viscosities suitable for use on automated production coating lines, supporting high-volume manufacturing requirements.
Cost-Effective Thread Locking: Pre-applied at the point of manufacture, Tec-Bond® 235 eliminates the need for bottled thread locking compounds applied at the point of assembly, reducing labor time and per-unit cost.

What is the difference between Tec-Bond® 235-IN and 235-PR?

The Industrial Grade (235-IN) is suited for general-purpose fastener locking on standard metal substrates. The Precision Grade (235-PR) was developed for precision assemblies where physical properties are tightly controlled and microcapsule character is specifically engineered.

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What is the difference between Tec-Bond 235 solvent-based and Tec-Bond 235 DPC?

Tec-Bond 235 is the standard solvent-based formula. Tec-Bond 235 DPC (Dry Powder Concentrate) has the solvent removed, improving transport efficiency and extending bulk shelf life from 1 year to 3 years, while delivering equivalent on-part performance.

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Does Tec-Bond® 235 require primer or heat to cure?

‍No. Tec-Bond® 235 is a room-temperature curing adhesive that requires neither heat nor primers for activation. Cure is initiated by the shearing forces generated during fastener installation.

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Is there a water-based alternative to Tec-Bond® 235?

‍Yes. Tec-Bond® 240 is the direct water-based, REACH and RoHS compliant alternative toTec-Bond® 235, delivering equivalent locking performance with solvent-free chemistry.

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