Europe Highlights

Nissei’s PLB (Perfect Lock Bolt)
Has a Version 2 Upgrade!
Now Targeting Users & Licensees in Europe & the U.S.
★Ad page 122★

The one and only PLB anti-loosening bolt had its debut
introduction on Fastener World Magazine several years ago
and made a great hit on the market for its high performance.
In a nutshell, this is a dual-thread and dual-nut anti-loosening
structure exclusive to Nissei Co., Ltd., a special bolt developer andmanufacturer with high reputation and customers’ trust in Japan.
Now called “PLB v2”, this Perfect Lock Bolt has taken a stepfurther to cater to even better performance and higher usability,
targeting not just Japan but also Europe and the world market.

Industry Breakthrough from
Nissei’s Thread RollingTechnologySingle-step Tightening for Best
Anti-loosening
PLB v2 is an anti-loosening bolt consisting of a dual-threadbolt shaft and two nuts with different thread lead angles. The firstnut with a larger lead angle on the bolt is a multi-thread nut; theouter or secondary nut on the bolt is a single-thread nut. When
PLB v2 is subjected to vibration or a loosening force of anyform, the force initiates rewinding on the inner nut. The slowmoving outer nut will block the inner nut's progression, whichforms a mechanical lock which is the secret to PLB v2’s antiloosening design that no other fastening system has achieved.
This mechanical lock mechanism is a stark contrast to othersystems using “friction” to defy loosening, creating best benefits
for users including unrivaled high-anti loosening force, easein maintenance and extensive usability. Traditional double nut
type bolt demonstrates moderate anti-loosening performance,
while the usability is challenging because two or three tightening
procedure is needed. In contrast, PLB v2 can achieve outstandinganti-loosening performance by demonstrating the highest rankwith the Junker vibration test according to ISO 16130 andusability performance by tightening in a single action, which are
great upgrade features from the first generation.

Around 20 years ago, the industry conceived of adesign where two different screw shapes form the coaxialportion. The manufacturing was challenging, because
cutting was the only method available and it is more timeconsuming than rolling, and it also raises price since it
doesn’t allow for mass production. One time a professor
asked if Nissei could manufacture the design using threadrolling. It gave the company an idea to develop the first
generation of PLB. With trials and customers’ feedback,the company eventually created the thread rolling dies for
manufacturing “PLB v2”, a next-generation and globallypatented breakthrough from its predecessor.

Expand PLB v2 Application to Europeand USA
With its predecessor PLB sold in North America and used on belt
conveyors and vibrating sifters, PLB v2 is used mainly where severe
vibration occurs such as mines in Japan. Nissei is looking to expand on
PLB v2 and seeks licensees in Europe and USA that manufacture andsell it under the license agreement worldwide. There are great benefits
with licensees since they aren’t bound by one manufacturing method
such as cutting, rolling, and die casting. Nissei believes PLB v2 will solve
all issues with bolt loosening and encourages users by offering samples
for them to try to use PLB v2 wherever bolt loosening occurs.

» Contact: Yuki Okimoto, Engineer
Email: y _ okimoto@nisseiweb.co.jp▲PLB v2 thread rolling dies

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Fastener World no.194/2022