Get PLB v2 sample

To user

Proven the top rank in ISO 16130 vibration test

Junker vibration test machine

We have evaluated the locking performance with the Junker vibration test, called the most severe test for bolted joints, in ISO 16130. The relative clamp forces of all PLB v2 remained almost constant during the vibration test, and the final rate of any residual clamp force exceeded the reference value of 85% given in the ISO16130 standard. PLB v2 demonstrates the highest rank in ISO 16130 though no fastener systems can archive this offer.

PLB v2 vibration test result graph
Test Performance
User Voice

Easy to install and remove with standards tool

PLB v2 offers high usability performance because it can be used with the standard and power tools!

PLB v2


The inner nut will follow the outer during the tightening process.
You can complete it by tightening the outer nut only. Only one action!


You can remove the inner nut easily after the outer is removed.

Low maintenance cost

PLB v2 can save on maintenance costs thanks to the combined high locking and usability performance. PLB v2 doesn't need high torque for the tightening procedure.
So, it can be Reusable because the screw thread isn't damaged.
We have conducted the maintenance performance test for the PLB v2 and the traditional fastener systems with the Junker vibration machine. Please check the video as follows.

The bigger vibration, the stronger PLB v2 is in effect.

PLB v2 offers the best performance in the application especially where severe vibration occurs. The pictures below show some of the fields in which PLB v2 can be useful.

PLB v2 market

Test by yourself

Free sample <10 pieces

We are looking for a user who would like to test the PLB v2 in your application area. We can provide the samples suited to your requirement(Size, Material, Class. Surface treatment, and on...)
If you have interested and need the samples more than 10pcs, please contact us PLB v2 contact form.

Applicable size and material

Size: M8-M24 are readily available. Other size like inch are in preparation.
Material: If rolling is possible, PLB v2 can be made from that material.

To license

The Business is protected under IP.

PLB and PLB v2 are protected intellectual properties.

PLB intellectual properties

NO additional process required for production

PLB v2 can be produced by simply mounting the dies for PLB v2 thread rolling provided by us at the threading procedure. PLB v2 can be produced in the same manufacturing method and procedure as standard bolt and nut. Threads are rolled in One process.

Rolling by cylindrical dies machine

Bolt manufacturing procedure

Bolt manufacturing procedure

Nut production

Nut production

No production unit's investment required.

We can provide the PLB v2 thread rolling dies suited to your existing machinery. So, you don't need to prepare the new machinery for PLB v2 production. We ready them for all types of thread rolling machines.

PLB v2 Production

PLB v2 can be produced with cutting, forming, and casting in addition to thread rolling. We have the patent for the structure of PLB v2, so the licensee has a great benefit because they don't bound the manufacturing method for production.

PLB v2 dice


  • No additional process.
  • No introduction of the new machine.
  • No development and manufacture costs.

For better understanding


PLB v2 consists of a dual-thread bolt screw and two nuts with different thread lead angles.
The inner nut with a larger lead angle on the bolt is a multiple-thread nut; the outer nut on the bolt is a single-thread nut. When PLB v2 is subjected to vibration or a loosening force of any form, the force initiates the loosening on the inner nut. The slow-moving outer nut will block the inner nut's progression, forming a mechanical lock that is the secret to PLB v2's anti-loosening design.
No other fastening system has been achieved in the world.
This mechanical lock mechanism is a secret contrast to other systems using "friction" to prevent loosening, creating the best benefits for users, including high-anti loosening force, ease in maintenance, and extensive usability...

PLB v2 principle


No exhibit planning at this moment.


As strap pin
4/22/2022 the excellent prize of "the 34th medium and small-sized business excellence new technology, new product prize" public section.
As bolts
11/02/2023 Received the "39th 2023 Sokeizai Industry Technology Award".

10/31/2023 Received the "20th 2023 Super Manufacturing Parts Award Monodzukuri Japan Conterence Co-chairman Award".
01/23/2023 Winners of the Ninth Monodzukuri Nippon Grand Awards
The Minister of Economy Trade and Industry Prize


Contact us for details about acquiring a license to produce Perfect Lock Bolts.