Spiral SDS – (Heavy to Very Heavy)

Spiral Self Drilling Screws (for heavy to very heavy application)


Product Description

MARK Plus  Hex Indented Flanged Washer Head Spiral Self Drilling Screws

Features :

  • Manufactured from ultra tough carbon steel C-1022
  • Cold Forged & heat treated for extra strength & durability
  • Hardened drill point enables screws to drill through steel and lead threads formed on screws allows correct tapping at high drilling speed
  • Tin & Zinc based mechanically deposited high anti corrosive ruspert/xylan coating as per AS 3566.2 Class 3 provide for additional cover against scratches, gas and weathering
  • Uniformly coated finish for better aesthetic value
  • Unique Drill Point to maximize performance with minimum efforts
  • Sharp thread threads design maximize pull out and minimise backout 

Applications :

  • For heavy to very heavy purpose
  • Stitching roof decks and wall panels to heavy steel
  • Commercial and industrial frame construction 

Technical Details :

  • Material : C-1022
  • Case Hardened
  • Coating: Ruspert/ Xylan
  • Finish : Silver Grey
  • Washer : EPDM 

Available Sizes : 


Drill Point Type Thread

Drilling Cap

5.5 – 24 x 38mm

5P Spiral Full 12mm
5.5 – 24 x 50mm 7P Spiral Full


5.5 – 14 x 50mm

8P Spiral Full 21mm

5.5 – 14 x 65mm

9P Spiral Full






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