• Special Screws
  • Chemical Resistance Screws


Seal Washers - Teflon Coating

  • Chemical-proof

Dimension Drawing

SWS-HTFSeal Washers - Teflon Coating寸法図


Unit : mm

Part Number Nominal d D h t t1 C Qty per pack Mass
CAD Standard
SWS-3-HTF 3 3.2 7 0.5 2.2 2.2 6.3 1 0.2 5.39 CAD Cart


Main Body SUS304
Teflon*1 Coating
Rubber Packing Fluoro-rubber

*1: Teflon is a registered trademark of DuPont.


FPD production equipment / Semiconductor fabrication wet processes /
Printed circuit board etching devices / Metallic surface treatment
equipment and facilities / Cleaning equipment / Chemical plants


  • Sealing washers with a built-in rubber seal.
  • Sealing washers prevent the leakage of gas and liquid from the bearing surface of the screw head.
  • The washer body is coated with Teflon. The rubber seal is made of fluororubber, which has excellent chemical resistance.
  • Chemical Resistance of Teflon Coating⇒Chemical Resistance of Chemical Resistance Screws

Usage Example

Use with SNHS-HTF Hex Head Screws-Teflon Coating for Head

(SNHS-HTF) to prevent chemical liquids from moving from the bearing surface to the thread.

  • Airtight test at 0.6 MPa confirmed that there is no leakage.

SWS-HTFSeal Washers - Teflon Coating

Precautions for Use

  • Friction with the screw bearing surface during tightening may remove the coating. Take care not to tighten too much.
  • When combining with SNHS-HTF, use the recommendation torque of SNHS-HTF or less for tightening.

Related Products

SWS Sealing Washer, which is not Teflon coated is available.

SWS-HTFSeal Washers - Teflon Coating

Product List

Customer Service

  • Usage Method
  • Technical Question
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NBK America LLC

8:00 to 17:00 on weekdays, Eastern Standard Time