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Series SK 550

Pull-style expander seals use an integrated mandrel to insert the expander plug into a drilled hole. The KOENIG EXPANDER® Series SK / SKC 550 plug does not require the hole to be counter-bored, and is often used for angled channels or installations with difficult orientations. They are ideal for installations with space or weight constraints. If you are unsure if the SK / SKC 550 expander sealing plug series is the right component for your application, use our Product Selector to identify the best KOENIG EXPANDER part for your specifications.

Material:

Sleeve: Case Hardening Steel, Gun Metal-Finish    

Mandrel: Heat Treatable Steel, Special Oil Film Lubrication

Downloads

Video Of Series SK 550

KOENIG EXPANDER® SEALING PLUGS Series SK 550 / SKC 550
Part Number d1 l1 d2 l2 l3 max. l4 max. d3 Packaging Unit* Weight in gram/pcs.
+0.12 0
SKC550-040 4 4.5 2.5 39 8.1 6.5 4 100 / 1000 1.71
SKC550-050 5 5.5 2.8 41 9.5 7.5 5 100 / 1000 2.5
SKC550-060 6 6.5 3.3 38 11.5 8.5 6 100 / 500 3.5
SKC550-070 7 7.5 4 38 13 9.5 7 100 / 500 5.1
SK550-080 8 8.5 4.2 40 15 10.5 8 100 / 500 6.33
SK550-090 9 9.5 4.5 43 17 11 9 100 / 250 8.23
SK550-100 10 10.5 4.75 45 19 12.5 10 100 / 250 10.57
SK550-120 12 12.5 5.7 50 24 16.5 12 50 / 250 16.77
PRESSURE PERFORMANCE
  Base Material of the Installation
Series High Strength Steel Case Hardened Steel Ductile Cast Iron Gray Cast Iron Aluminum-Alloy Aluminum-Alloy Cast Aluminum-Alloy
SK 550 ETG-100 / 44SMn28 C15Pb / 1.0403 EN 1563: GJS-600-3 EN 1561: GJL-250 AICu4Mg1 / EN AW-2024-T3 AIMgSiPb / EN AW-6012-T6 G-AISi7Mg / EN-AC-42100
mm AISI 11441 AISI 10L15 ASTM A536: 80-60-03 ASTM A48: NO.35 AA: 2024 T4/T6* AA: 6012-T6 ASTM/UNS: A356
Ø 4 – 10 1600 bar / 23200 psi 1400 bar / 20300 psi
   500 bar / 7200 psi    450 bar / 6500 psi
Ø 12 1600 bar / 23200 psi
   400 bar / 5800 psi
Proof Pressure Test B
Max. allowable Working Pressure = Nominal Pressure
*SFC KOENIG’s North American Engineering Department utilizes 2024-T4/T6 as a test base material.