KOENIG EXPANDER® SERIES SK 552 Long Mandrel

  • Sealing plugs for operating pressures up to 500 bar / 7200 psi
  • Short installation length
  • Liberal manufacturing tolerance 0 / + 0.12mm
  • Extended mandrel for deeper setting

KOENIG EXPANDER® SERIES SK 552 Long Mandrel

KOENIG EXPANDER® SERIES SK 552 Long Mandrel – OVERVIEW

SK 552 pull style expander seal
Series SK 552 expander plug
Pull-style expander seals use an integrated mandrel to insert the expander plug into a drilled hole. The KOENIG EXPANDER® SK 552 Long Mandrel 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.

Material:

Sleeve: Case Hardening Steel, Gun Metal-Finish    Mandrel: Heat Treatable Steel, Special Oil Film Lubrication

Product SpecificationsPressure Performance3D CADTechnical DownloadsVideo
Part Numberd1l1d2l2I3 max.I4 max.d3
+ 0.12
0
Packaging UnitWeight in
gram/pcs.
SK 552-0404.04.52.50699.06.54.0100/10002.87
SK 552-0505.05.53.007110.07.55.0100/5004.32
SK 552-0606.06.53.407312.08.06.0100/5005.65
SK 552-0707.07.54.106814.09.07.0100/2508.01
SK 552-0808.08.54.207015.010.58.0100/2509.60
SK 552-0909.09.54.507317.011.09.050/10011.97
SK 552-10010.010.54.757519.012.510.050/10014.73

Dimensions in millimeters

Series
SK 552
mm
Base Material of the Installation
High Strength Steel
ETG-100 / 44SMn28
AISI 1144
Case Hardened Steel
C15Pb
1.0403
AISI 10L15
Ductile Cast Iron
EN1563:GJS-600-3
ASTM A536:80-60-03
Gray Cast Iron
EN1561:GJL250-ASTM A48: NO35
Aluminum-Alloy
AICu4Mg1
EN AW-2024-T3
AA:2024 T4/T6*
Aluminum-Alloy
AIMgSiPb
EN AW-6012-T6
AA:6012-T6
Cast Aluminum-Alloy
G-AISi7Mg/
EN-AC-42100/ASTM/UNS:A356
Ø 4 – 101600 bar /
23200 psi
500 bar / 7200 psi
1400 bar / 20300 psi
450 bar / 6500 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.
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Operation

Technical Information

Industries

Our parts are proven reliable in a variety of industries and applications, including transportation, fluid power, precision and micro-hydraulics.

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Our sealing and flow control solutions comply with global quality assurance and certification standards.