Hints for Correctly Using NBK Products

Material/Finish

Application

Screw fall/loss prevention / Fixing of protection covers and covers for inspection / Compliance with CE marking
Machine tools / Food machinery / Electrical and electronic equipment / Infrastructure facilities / Redundant safety measures / Redundant fall prevention

Characteristics

• Set of Hex Socket Head Cap Captive Screw SSC and Captive Washer SWAS-SC.
• Even when the screw is removed from the frame, SSC does not fall out of the cover because the washer hook catches on the screw thread. Even if SWAS-SC is damaged, the SSC thread part will catch, for double prevention of screw fall-off and loss.
• For CE Marking compatibility.⇒Use the NBK Captive Screw Series to be comply with CE

Usage Example

When a screw mounted on a cover is removed from the frame, thanks to the redundant fall protection of the captive screw and captive washer, the screw does not fall.

Precautions for Use

• Screw hole inner diameter on the cover side shall be at least the dc dimension.
• The cover thickness should be 0.8 mm or above.
• Once SWAS-SC is mounted on a screw, it cannot be easily removed.
• To remove, either SWAS-SCor screw must be cut. Take care when mounting.
• When the screw is loosened with SWAS-SC pressed to the cover, SWAS-SC may come off.

Mounting Example

① Make a screw hole in the cover, and then pass the SSC thread part through it.
② Press-fit SWAS-SC into the thread part from the screw tip side. Ensure that the SWAS-SC hooks face the frame side. When mounting, use the dedicated tool SKSC (sold separately). For the frame side female thread chamfering, refer to Table 1.

Table 1

Related Products

Use SKSC for captive washer mounting.
SKSC