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. If you are unsure if the SK 552 Long Mandrel 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

Product SpecificationsPressure PerformanceTechnical DownloadsVideo
Product Numberd1l1d2l2l3 max.L4 Max. (BO)d3 +0.12 / -0Packaging UnitWeight in gram/pcs.3D CAD
SK 552-04044.52.56996.54100 / 10002.87
SK 552-05055.5371107.55100 / 5004.32
SK 552-06066.53.4731286100 / 5005.65
SK 552-07077.54.1681497100 / 2508.01
SK 552-08088.54.2701510.58100 / 2509.6
SK 552-09099.54.5731711950 / 10011.97
SK 552-1001010.54.8751912.51050 / 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.

Operation

Technical Information

Industries

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

Certificates

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