SY-NUT for locking bolts and nuts

SY-NUT for locking bolts and nuts

Principle of SY-NUT(Tightening of Bolts & Nuts)

SY-NUT is most suitable for fastening structures under vibrations.

SY-NUT(Flexibility against Train Derailment and Collapse of pylon)

SY-NUT guarantee bolts and nuts to be sale and locking engagement from au structures under vibrations and shock in the following fields
– The engagement of railway rails
– Locomotives
– Beams of the transmission line(Pylon) bridge deck
– Beams of construction structure
– Various heavy machinery (military tanks, automobiles and planes), etc.

(Left) The train derailed due to loosening of bolt and nut at the track branch. / (Right) The transmission tower that could not withstand a typhoon.

These are “the problems of flexibility”

SY-NUT(Prevention of bolts & nuts Loosening under Vibration and Shock of Structures)

Bolts and nuts are essential components for tightening structures, but they have structural problems that by vibration and shock.SY-NUT (Bolts and Nuts that prevent loosening) solves this phenomenon fundamentally.

SY-NUT(Free tightening; Loose tightening is also possible) OK

The feature of SY-NUT is to maintain the tightening condition without releasing, even if it is moderately tightened at any tightening end point.

• Concrete sleeper that ruptured on railway tracks

When fastening different materials, for example, concrete sleeper and rails, Excessive tightening can pose a risk to train safety due to concrete rupture, and loose tightening will not ensure the safety of the train due to incomplete fastening.

• The joint region of excavator : Excessive tightening will inhibit rotation and loose tightening is unsafe and dangerous.

• Screws will not loosen even if moderately tightened at any point.

The Excellence of SY-NUT Technology

1. Existing methods to prevent loosening
   – To fasten several nuts
   – To insert split pins by drilling holes in the bolts and nuts
   – To fill the space between the screw nuts with ring-shaped coils
2. This SY-NUT product is normally rotated in the screw tightening direction so that it can be tightened.
   However, it prevents loosening by making it impossible to rotate due to a latch at ordinary time.
3. During the maintenance, bolts and nuts can be loosened by pressing the latch with a box wrench.
4. Even if properly or loosely tightened, it will never be released in the opposite direction.
5. Existing nuts have many difficulties.
   – They cannot be used for long term due to corrosion(oxidation) of metals caused by the water ingress such as rain.
   – They can be also damaged during the inspection of dismantling.
6. This SY-NUT product can use nonmetallic stainless steel or alloy, and can prevent corrosion by applying lubricant(grease) to effectively block oxygen and moisture.

Comparison SY-NUT with Existing Type A

Comparison SY-NUT with Existing Type B

Comparison of existing nuts

Existing nuts require a lot of parts to prevent the release from vibration of trains as a key component of the on-site railway track switchboard.

Applications of SY-NUT(Heavy equipment for automobiles, Engines of ships)

Applications of SY-NUT