• Special Screws
  • Washers・Insert

Captive Washers


  • Loss Prevention

Dimension Drawing

SWAS-SCCaptive Washers寸法図


Unit : mm

Part Number Nominal D d t h Dedicated Tool Qty per Pack Mass
SWAS-3-SC 3 8 2.6 0.3 0.9 SKSC-345 100 0.087 38.14 CAD Cart
SWAS-4-SC 4 10 3.4 0.3 0.9 SKSC-345 100 0.14 38.93 CAD Cart
SWAS-5-SC 5 12.7 3.9 0.3 1.1 SKSC-345 100 0.25 41.31 CAD Cart
SWAS-6-SC 6 15.7 4.7 0.4 1.4 SKSC-68 100 0.47 41.31 CAD Cart
SWAS-8-SC 8 21.6 6.8 0.4 1.9 SKSC-68 100 0.94 48.46 CAD Cart
SWAS-10-SC 10 22 8.7 0.4 1.7 SKSC-1012 100 0.9 57.20 CAD Cart
SWAS-12-SC 12 26 10.5 0.4 1.8 SKSC-1012 100 1.3 64.35 CAD Cart

Related Services


Main Body SUS304*1

*1: SWAS-5-SC, SWAS-6-SC, and SWAS-8-SC are SUS302.


Fall/loss prevention for protective and inspection covers / Compliance with CE marking
Machine tools / Food machinery / Electrical and electronic equipment


  • Prevents screw fall-off and loss simply by assembling it onto a commercially available screw.
  • The washer hooks securely catch the thread peaks so that after mounting, they will be unlikely to fall off the screws.
  • They are intended for the fixing bolts on protective and inspection covers that are frequently mounted and removed.
  • For CE Marking compatibility.⇒Use the NBK Captive Screw Series to be comply with CE

Usage Example

When a screw attached to a cover is removed from the frame, the screw does not fall.

SWAS-SCCaptive Washers

Precautions for Use

  • 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 Method

Adhere the SKSC tip magnet to the side where the SWAS-SC hooks emerge.
Pass the screw through the cover, and then insert into SKSC and press-fit SWAS-SC into the thread.

SWAS-SCCaptive Washers

Mounting Example

Pass the screw through the cover, and then press-fit SWAS-SC into the thread from the opposite side. Ensure that the SWAS-SC hooks face the frame side.

SWAS-SCCaptive Washers

Table 1

Unit : mm

Part Number C
SWAS-3-SC 1.5-2
SWAS-4-SC 1.5-2
SWAS-5-SC 1.5-2
SWAS-6-SC 1.5-2
SWAS-8-SC 1.5-2
SWAS-10-SC 2-2.5
SWAS-12-SC 2-2.5

Related Products

SKSC dedicated mounting tools are available.

SWAS-SCCaptive Washers

Product List

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