Request Form0

Union flat seat, ISO/EN U1

Malleable cast iron fittings are offered in black and hot dip galvanized version. Because of their durability, high mechanical stress and temperature resistance these fittings continuously enjoy great popularity.
The thread according to EN 10226-1 is an universal, standardised jointing technology and ensures a safe use in a broad field of application.
Additionally to the threaded fittings, a compression fitting made of malleable cast iron is available. This fitting, sold under the brand PRIMOFIT, offers a full end load capability and is produced with black or hot dip galvanized surface. It is the time-saving connection of steel-pipeds, PE-piped, lead-pipes and butt-weld steel pipes.

  • Supplied without sealing gaskets; a and z1 include the seal thickness as per table "Sealing Gasket Dimension".
  • 374 G ... refers to the thread size G according to ISO 228 of the union nut 374.
  • * Inside hexagon

Technical Details

374 G
Add to Cart
1∕45∕8Measurements 770330102
3∕83∕4Measurements 770330103
1∕21Measurements 770330104
3∕41 1∕4Measurements 770330105
11 1∕2Measurements 770330106
1 1∕42Measurements 770330107
1 1∕22 1∕4Measurements 770330108
22 3∕4Measurements 770330109
2 1∕23 1∕2Measurements 770330110
34Measurements 770330111
-45Measurements 770330112
374 G
Add to Cart
1∕45∕8Measurements 770330202
3∕83∕4Measurements 770330203
1∕21Measurements 770330204
3∕41 1∕4Measurements 770330205
11 1∕2Measurements 770330206
1 1∕42Measurements 770330207
1 1∕22 1∕4Measurements 770330208
22 3∕4Measurements 770330209
2 1∕23 1∕2Measurements 770330210
34Measurements 770330211
-45Measurements 770330212


  • biggest assortment of all producers – cost reduction due to a minimum number of joints

  • corrosion retarding and reinforced (free outrunning) internal threads design for the most common articles
  • malleable cast iron of highest grade and drinking water friendly galvanizing with high purity zinc, conforming to DIN 50930 - 6
  • PRIMOFIT - Quick and easy assembly – low costs
  • PRIMOFIT - No threading of steel pipe required / no special tools or skills necessary
  • PRIMOFIT - Dismantling not required (before installation)

Fields of Application:
  • Cooling and air conditioning
  • Plant engineering (e.g. gas, emulsion and pressured air pipe work)
  • Construction of petrol stations (gas lines)
  • Mechanical engineering (e.g. oil, coolant and lubricant pipe work)

  • ISO, EN


Product Catalog
Technical Catalogue 2015 - Malleable cast iron fittings.pdfPDF3.18 MBDownload
Quick Request