ＬＮＳＪＡＰＡＮ List of Products and Services

The LNS method uses specially designed reinforcement materials (LOCK) and is a technology that can physically remove cracks with a metal touch. It has achieved numerous results so far, with a wealth of case studies. ●For more details, please download the catalog or contact us.

• Special Processing Machinery

The LNS method uses specially designed reinforcement materials (LOCK) and is a technology that can physically remove cracks with a metal touch. It has achieved numerous results so far, with a wealth of case studies. ●For more details, please download the catalog or contact us.

• Special Processing Machinery

Cracks have occurred in your company's important equipment. "Is it okay to weld? I don't want to weld... I'm anxious." "First, let's try grinding the crack! ... No good." "If it's a stop hole... No good." After consideration, welding is implemented... Again, it has broken! Welding is the only way to connect it! Just need it to last for a while! However, have you ever had an experience where the results were not as expected? With Locknstitch (LNS method), we can meet your expectations! There are things that can only be done with mechanical joining that does not use heat. It is compatible with all metals. Unlike conventional welding repairs, it does not add heat that damages the base material of the equipment. By not adding that heat, secondary cracks do not occur, and heat treatment and machining are also unnecessary. As a result, repairs can be completed in a short period, leading to extended equipment life with precision, durability, and low cost.

• Casting Machine

Full-Torque is an insert for repairing screw holes that can reinforce the base material due to its special screw thread shape. With its patented upward-facing screw thread structure, it draws in the surrounding base material to enhance its strength. It demonstrates exceptional functionality in areas where strong torque is inevitably generated. It can maintain female screw holes semi-permanently. For more details, please download the catalog or contact us. We will solve your concerns.

• Other processing machines
• Calibration and repair

The LNS method is a technology that uses specially designed screws and reinforcement materials (LOCK) to physically remove cracks with a metal touch. It has achieved numerous results and has a wealth of case studies. ● For more details, please download the catalog or contact LNSJAPAN.

• Calibration and repair

The LNS method is a technology that uses specially designed screws and reinforcement materials (LOCK) to physically remove cracks with a metal touch. It has achieved numerous results and has a wealth of case studies. Completely solve the problems of equipment crack repair. For more details, please download the catalog or contact us.

• Calibration and repair
• Other processing machines

The LNS method is a technology that uses specially designed screws and reinforcement materials (LOCK) to physically remove cracks with a metal touch. It has achieved numerous results and has a wealth of case studies. For more details, please download the LNSJAPAN catalog or contact us.

• Calibration and repair

The LNS method is a technology that uses specially designed screws and reinforcement materials (LOCK) to physically remove cracks with a metal touch. It has achieved numerous results and has a wealth of case studies. It completely solves the problems of metal crack repair (especially trunnions). ● For more details, please download the catalog or contact us.

• Calibration and repair
• Other processing machines

■□■A completely new method for repairing metal cracks that is not welding■□■ If you are experiencing cracks or bolt troubles in your important production equipment, please contact LNS JAPAN first. If possible, please reach out before any welding repairs. Download the inspection report below, fill it out (please do so from "Download Catalog"), and send it along with photos of the inspection points. We will get back to you with information on the feasibility of the work, repair duration, costs, and more.

• Other machine elements
• Other processing machines

■□■ A completely new method for repairing metal cracks that does not involve welding ■□■ 【Example of Achievements】 ○ Upper part of the crown side cover (forged press) → The forged press machine had oil leaks at the expanding areas, and crack repair (900mm) was completed in two days. ○ Additional hole processing at the crankshaft journal end → Completed in two days at eight locations. ○ Gear → A second break occurred from the welded area, reinforced with LNS reinforcement material (repair period: two days during the day). ○ Marine M/E cylinder block → The aging ME engine of the ship, made of a material difficult to weld, was repaired using the LNS method (repair period: 2.5 days). We have many other achievements as well. For more details, please contact us.

• Other machine elements
• Calibration and repair
• others

■□■ A completely new metal crack repair that is not welding ■□■ 　　　　　　~ Complete repair of screw holes ~ We offer a wide variety of inserts, including those that are commonly used and easy to install, as well as inserts used to maintain the sealing of bolt holes, and those that are most effective for maintaining hole sealing. "Full-Torque" is a screw hole repair insert kit that can strengthen the base material due to its special screw thread shape. The patented upward-facing screw thread structure draws in the surrounding base material, reinforcing it. Additionally, the force that pulls in the surrounding base material during product insertion allows for work to be done all the way to the corner edges. Unlike conventional temporary repairs, it enables permanent repairs, extending the lifespan of the equipment. For more details, please contact us.

• Other machine elements
• Calibration and repair
• others

We will free you from screw hole repairs. ~Complete Screw Hole Repair~ The Full-Torque screw hole repair kit allows for the reinforcement of the base material through a special screw thread shape. With a patented outward-facing screw thread structure, it draws in the surrounding base material to strengthen it. Additionally, the force that draws in the surrounding base material during product insertion allows for work to be done up to the corner edges. Unlike conventional temporary repairs, this provides a permanent solution, extending the life of the equipment. The work process is simple and can be done by anyone: drilling → tapping → product installation. We have sizes ranging from Φ6 to Φ64 in stock, but custom sizes and pitches are available upon order. For larger sizes, our engineers can perform the installation. You will notice the difference compared to existing products. For more details, please contact us.

• Other machine elements
• Calibration and repair
• others

■□■A completely new metal crack repair that is not welding■□■ Contributes to the extension of equipment lifespan The work process involves drilling → tapping → inserting special screws and reinforcement materials (LOCK), and unlike traditional welding repairs, it does not apply heat that damages the base material of the equipment. As a result, repairs can be completed in a short period, leading to extended equipment lifespan with improved precision, durability, and low cost. The "C Series Pin" is ideal for crosswise cracks that occur on the upper part of the cylinder head or cracks that have developed from plug holes or bearing holes. The "L Series Pin" features a screw hole size and a tapered base. The "LOCK" is used to increase strength across the crack. For more details, please contact us.

• Other machine elements
• Calibration and repair
• others

■□■ A completely new metal crack repair that is not welding ■□■ The strength reinforcement material "LOCK" is made from "4130 steel" and is heat-treated to maintain a tensile strength of 175,000 psi (12,200 kg/cm²). LNS Lock is manufactured by cutting with EDM wire for precision, making it superior to Roll Type and Punch Type locks in every aspect. Since the Lock cannot be bent, it cannot be applied to the corners of uneven areas and is only usable on flat surfaces. For more details, please contact us.

• Calibration and repair
• others

■□■ A completely new metal crack repair that is not welding ■□■ The "L Series Pin" is designed so that the size of the screw hole for the L Series Pin is 1/1000 inch smaller than the size of the pin, and it has a large taper (7 degrees) at the base of the screw. When tightened, it crushes about three threads of the female thread at the top of the screw hole. The L Series Pin is used when the repair area does not penetrate the inside or outside of a corner or does not pass through plug holes and bolt holes, or when there is no need to additionally increase structural strength. It eliminates the gap at the crack site while also serving the role of sealing and preventing loosening, demonstrating excellent effectiveness. For more details, please contact us.

• Other machine elements
• Calibration and repair
• others

■□■ A completely new metal crack repair that is not welding ■□■ The "C Series Pin" is a representative screw that showcases LNS's excellent technology. The CASTMASTER (C Series Pin) does not diffuse cracks; rather, it works in the opposite direction. In short, this pin features a special form of thread known as a "Spiral hook," which has a different angle compared to conventional screws. It pulls the crack areas together and secures them permanently. The key point is the thread shape, which differs from standard screws. It is better to use the largest diameter pin possible, and it can be applied from a thickness of 0.25" (approximately 6mm). For more details, please contact us.

• Other machine elements
• Calibration and repair
• others

■□■ A completely new method for repairing metal cracks that does not involve welding ■□■ The process consists of drilling → tapping → inserting special screws and reinforcement materials (LOCK), and unlike traditional welding repairs, it does not apply heat that could damage the base material of the equipment. By avoiding the application of heat, secondary cracks do not occur, and heat treatment and machining are also unnecessary. As a result, repairs can be completed in a short period, leading to extended equipment life with improved precision, durability, and low costs. For more details, please contact us.

• Other machine elements
• Other processing machines
• Calibration and repair

■□■A Completely New Metal Crack Repair That Is Not Welding■□■ 　　　　　　~Permanent Complete Repair~ The LOCK-N-STITCH 'LNS' method, which is not welding, uses special screws and reinforcement locks, employing mechanical stitch metal joining technology that prevents thermal distortion and secondary cuts, eliminates the need for machining, and allows for easy on-site construction, enabling a completely new crack repair that shortens construction time and reduces costs. Additionally, the permanent screw hole repair 'Full-Torque' is not a temporary fix like conventional products, but allows for a permanent repair, extending the life of the equipment. The permanent female thread repair insert 'Full-Torque Thread Insert' perfectly resolves worn or damaged bolt holes with a single application.

• Other machine elements
• Other processing machines
• Gearbox

■□■ A Completely New Metal Crack Repair That Is Not Welding ■□■ ~Complete Repair of Screw Holes~ The LOCK-N-STITCH 'LNS' method, which is not welding, uses special screws and reinforcement locks, employing mechanical stitching metal joining technology that prevents thermal distortion and secondary fractures, eliminates the need for machining, and allows for easy on-site construction, enabling a completely new crack repair that shortens construction time and reduces costs. Additionally, the permanent screw hole repair 'Full-Torque' is not a temporary fix like conventional products, but allows for a permanent repair, extending the lifespan of the equipment. The permanent female thread repair insert 'Full-Torque Thread Insert' perfectly resolves worn or damaged bolt holes in a single application.

• Other machine elements
• Other processing machines
• Gearbox

■□■ A completely new method for repairing metal cracks that is not welding ■□■ ● Cracks have occurred in your important equipment. "Is it safe to weld? I don't want to weld... I'm anxious." "Let's try grinding the crack first!... No good." "What about a stop hole?... No good." After consideration, welding is implemented... It broke again! Welding is the only option to connect it! Just needs to last for a while! The LOCK-N-STITCH 'LNS' method, which is not welding, uses special screws and reinforcement locks, employing mechanical stitching metal joining technology that prevents thermal distortion and secondary cracking, eliminates the need for machining, and allows for easy on-site construction, enabling a completely new crack repair that shortens construction time and reduces costs. Additionally, it allows for permanent repairs rather than temporary fixes, extending the life of the equipment. With the LNS method, we can meet your expectations! There are things that can only be done because it is a mechanical joining method that does not use heat. It is compatible with all types of metals.

• Other machine elements
• Other processing machines
• Gearbox