Loctite 648 High Strength Retaining Compound
Loctite 648 Low-visc High Strength Retaining Compound 50ml
- Shear Strength, Steel : 3900 psi
- Temperature : -65 - 300 °F
- Viscosity : 500 mPa.s (cP) Brookfield
- Color : Green
- Curing Type : Anaerobic
- Application : Retaining
LOCTITE 648 is a green, fluorescent, low viscosity, high strength, urethane methacrylate acrylic, anaerobic retaining compound designed for bonding cylindrical fitting parts. It prevents loosening and leakage from shock and vibration. Typical applications include holding gears and sprockets onto gearbox shafts and rotors on electric motor shafts. It provides robust curing performance.
- Low viscosity
- High strength
- Designed for bonding cylindrical fitting parts
- Works on active metals (e.g. mild steel) as well as passive substrates such as stainless steel and plated surfaces
- Offers high temperature performance and oil tolerance
- Tolerates minor surface contaminations from various oils such as cutting, lubrication, anti-corrosion and protection fluids
648™ is designed for the bonding of cylindrical
fitting parts. The product cures when confined in the absence
of air between close fitting metal surfaces and prevents
loosening and leakage from shock and vibration. Typical
applications include holding gears and sprockets onto gearbox
shafts and rotors on electric motor shafts. LOCTITE®
provides robust curing performance. It not only works on active
metals (e.g. mild steel) but also on passive substrates such as
stainless steel and plated surfaces. The product offers high
temperature performance and oil tolerance. It tolerates minor
surface contaminations from various oils, such as cutting,
lubrication, anti-corrosion and protection fluids.
TYPICAL CURING PERFORMANCE
Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The graph
below shows the shear strength developed with time on steel
pins and collars compared to different materials and tested
according to ISO 10123.
Cure Speed vs. Bond Gap
The rate of cure will depend on the bondline gap. The following
graph shows shear strength developed with time on steel pins
and collars at different controlled gaps and tested according to
Cure Speed vs. Temperature
The rate of cure will depend on the temperature. The graph
below shows the shear strength developed with time at
different temperatures on steel pins and collars and tested
according to ISO 10123.
Cure Speed vs. Activator
The graph below shows the shear strength developed with
time on stainless steel pins and collars using Activator SF
7471™, SF 7649™ and SF 7091™ and tested according to
This product is not recommended for use in pure oxygen
and/or oxygen rich systems and should not be selected as
a sealant for chlorine or other strong oxidizing materials.
For safe handling information on this product, consult the
Safety Data Sheet (SDS).
Where aqueous washing systems are used to clean the
surfaces before bonding, it is important to check for
compatibility of the washing solution with the adhesive. In
some cases these aqueous washes can affect the cure and
performance of the adhesive.
This product is not normally recommended for use on plastics
(particularly thermoplastic materials where stress cracking of
the plastic could result). Users are recommended to confirm
compatibility of the product with such substrates.
Directions for use
- For best results, clean all surfaces (external and
internal) with a LOCTITE®
cleaning solvent and allow to
- To accelerate cure speed or where large gaps are
present, use activator and allow to dry.
- For Slip Fitted Assemblies, apply adhesive around the
leading edge of the pin and the inside of the collar and
use a rotating motion during assembly to ensure good
- For Press Fitted Assemblies, apply adhesive
thoroughly to both bond surfaces and assemble at high
press on rates.
- For Shrink Fitted Assemblies, the adhesive should be
coated onto the part to produce a smooth, even film of
material. If heating the hub for assembly, coat the pin. If
the pin is to be cooled for assembly, coat the hub. If
both heating and cooling is to be done, apply material to
cooled part. Avoid condensation on cooled parts.
- Parts should not be disturbed until sufficient handling
strength is achieved.
- Remove with standard hand tools.
- If needed, apply localized heat to the assembly to
approximately 250 °C. Disassemble while hot.
- If this temperature is not possible, heat as much as
possible and use mechanical aids.
- Cured product can be removed with a combination of
soaking in a Loctite solvent and mechanical abrasion
such as a wire brush.
Store product in the unopened container in a dry location.
Storage information may be indicated on the product container
Optimal Storage: 8 °C to 21 °C. Storage below 8 °C or
greater than 28 °C can adversely affect product properties.
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