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.
Sleeve: Case Hardening Steel, Gun Metal-Finish
Mandrel: Heat Treatable Steel, Special Oil Film Lubrication
| Product Number | d1 | l1 | d2 | l2 | l3 max. | L4 Max. (BO) | d3 +0.12 / -0 | Packaging Unit | Weight in gram/pcs. | 3D CAD |
|---|---|---|---|---|---|---|---|---|---|---|
| SK 552-040 | 4 | 4.5 | 2.5 | 69 | 8.2 | 6.5 | 4 | 100 / 1000 | 2.87 | View CAD |
| SK 552-050 | 5 | 5.5 | 3 | 71 | 10.2 | 8 | 5 | 100 / 500 | 4.32 | View CAD |
| SK 552-060 | 6 | 6.5 | 3.4 | 73 | 12.0 | 8 | 6 | 100 / 500 | 5.65 | View CAD |
| SK 552-070 | 7 | 7.5 | 4.1 | 68 | 13.6 | 9.5 | 7 | 100 / 250 | 8.01 | View CAD |
| SK 552-080 | 8 | 8.5 | 4.2 | 70 | 14.9 | 10.5 | 8 | 100 / 250 | 9.6 | View CAD |
| SK 552-090 | 9 | 9.5 | 4.5 | 73 | 17.1 | 11.5 | 9 | 50 / 100 | 11.97 | View CAD |
| SK 552-100 | 10 | 10.5 | 4.8 | 75 | 19.1 | 13.5 | 10 | 50 / 100 | 14.73 | View CAD |
Dimensions in millimeters”
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| 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 |
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| Ø 4 – 10 | 1600 bar / 23200 psi 500 bar / 7200 psi |
1400 bar / 20300 psi 450 bar / 6500 psi |
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| 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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