Blind Nuts



The POP one-side fastening method allows fast nut setting. Enables quick assembly on assembly lines with low-skill workers, helping to reduce costs compared to welding nut, burring tap and bolt & nut methods. Installation after surface treatment and in the later processes is possible because nuts do not damage the surface.
Thread size |
M3 M4 M5 M6 M8 M10 M12 |
Grip range |
0.5mm〜6.0mm |
Material |
Aluminum, Steel, Stainless steel |


POP fastening tools can fasten POP Nuts and POP insert easily. Choose a suitable tool type from manually operated, electric, air pressure and air-hydraulic tools depending on your situation.
Air hydraulic |
PNT800A PNT800L-PC |
Air pressure |
AN-500A |
Electric |
EN600A EN1000A |
Manual |
PNT110 PNT210 MN-10A |


Based on customer's specifications, NPR designs and manufactures fastening systems from jigs that hold things in place vertically to fully automated assembly lines. NPR approaches fastening as a system and offers a total fastening system from fasteners to auto-fastening systems.
POP Rivets |
RivetKwik multi-axis riveting |
POP Nuts |
NutKwik automatic nut feeding etc. |


Well Nuts are rubber blind nuts which can be fastened unilaterally with anti-vibration, isolating conductivity and seal effect. They can easily be unilaterally installed with a screwdriver. They are especially effective for noise reduction of the fan unit because of their vibration reduction effect.

Thread size |
M3 M4 M5 M6 M8 |
Minimum thickness |
0.4mm〜29.0mm |
Material |
Body/Chloroprene, EPDM Nut/Bronze |


Jack Nuts can be installed into not only metal pieces, but also fragile pieces made of plastic and glass since 3-4 legs of Jack Nuts open according to the shape to securely hold the workpieces when fastening. The grip range of Jack Nuts is wider compared to POP Nuts.

Thread size |
M4 M5 M6 |
Minimum thickness |
0.4mm〜9.5mm |
Material |
Steel |


Bolts can be fixed easily in plastic and metal workpieces unilaterally with air hydraulic hand tools. Insert bolts and weld bolts can be replaced with HB Bolts.

Thread size |
M6 M8 |
Grip range |
0.5mm〜4.5mm |
Material |
steel |


Heli-Coil is the screw thread insert, an elastic type of spring coil. When inserted into the tap hole of the workpiece, screw threads are reinforced and strengthened.

Thread size |
M2.2 M2.5 M3 M3.5 M4 M5 M6 M7 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 |
Material |
Stainless steel |
