Screw-to-Connect vs. Push-to-Connect

Why test couplings of the STAUFF Test 20 series with adaptation thread are to be preferred over flat-face diagnostic push-to-connect couplings

Knowledge
19.01.2022
Boris Mette
Estimated read time: 4 minute/s

Screw-to-Connect vs. Push-to-Connect

Why test couplings of the STAUFF Test 20 series with adaptation thread are to be preferred over flat-face diagnostic push-to-connect couplings

Knowledge
19.01.2022
Boris Mette
Estimated read time: 4 minute/s

Screw-to-Connect vs. Push-to-Connect

Why test couplings of the STAUFF Test 20 series with adaptation thread are to be preferred over flat-face diagnostic push-to-connect couplings

Apart from test couplings of the STAUFF Test 20 series (or comparable products) with an adaptation thread M16 x 2 according to ISO 15171-2 for connecting hoses or adapters with measuring, testing, and indicating devices, there is another product used in similar applications.

Flat-face version diagnostic plug-in couplings, whose design, dimensions and performance requirements are regulated by standards SAE J 1502 and ISO 15171-1, are widely used in the North American market.

In this blog post, you will find detailed information that serves as a basis for a qualified comparison of both systems.

Test Couplings with Adaptation Thread

Series STAUFF Test 20 (or comparable products) with adaptation thread M16 x 2 according to ISO 15171-2

Standardisation

  • in accordance with ISO 15171-2 (Connections for fluid power and general use - Hydraulic couplings for diagnostic purposes - Part 2: Coupling with M16 x 2 end for connection under pressure)
     

Availability and interchangeability

  • considered the worldwide standard and are usually available from stock
  • in case of a standard-conforming design, interchangeability of comparable products of different manufacturers is possible and their compatibility with each other is usually ensured
     

Operating pressure and coupling capability

  • permissible operating pressure of up to 630 bar (depending on the type of coupling)
  • coupling / decoupling of measuring hoses or adapters with measuring and display devices during operation under system pressure of up to 630 bar possible (depending on the type of coupling; 400 bar for test couplings with adaptation thread M16 x 2 according to ISO 15171-2) 
  • no time-consuming and costly shutdown of the system required
  • connection of measuring hoses or adapters with measuring and display devices by hand, i.e. without tools
     

Protective cap

  • always supplied with pre-assembled protective cap from the manufacturer
  • robust knurled metal protective cap as standard, attached to the coupling body by chain
  • external o-ring between cap and body, which acts as vibration protection against self-loosening of the cap
  • no risk of dirt entering the hydraulic system after loosening or loss of the protective cap
     

Variety of variants and installation options

  • male threaded test couplings with all internationally common connection threads and sealing types in hydraulics, bulkhead couplings, test couplings with DKO, JIC and ORFS connections as well as on straight DIN/ISO tube connectors are part of the standard range of all well-known manufacturers

Flat-Face Diagnostic Push-to-Connect Couplings

Parker PD, Eaton/Aeroquip FD90, Faster DF series and others according to SAE J 1502 and ISO 15171-1

Standardisation

  • in accordance with ISO 15171-1 (Connections for fluid power and general use - Hydraulic couplings for diagnostic purposes - Part 1: Coupling not for connection under pressure) and SAE J 1502 (Connections for fluid power and general use Hydraulic couplings Diagnostic)
     

Availability and interchangeability

  • are considered standard in North America and are typically available from stock
  • in case of a standard-conforming design, interchangeability of comparable products of different manufacturers is possible and their compatibility with each other is usually ensured
     

Operating pressure and coupling capability

  • permissible maximum operating pressure between 400 and 500 bar (depending on the manufacturer and the type of coupling)
  • no coupling / decoupling of measuring hoses or adapters with measuring and display devices possible under pressure
  • time-consuming and costly shutdown of the system required
  • connection of measuring hoses or adapters with measuring and display devices by hand, i.e. without tools
     

Protective cap

  • protective cap is supplied as an optional feature and must be assembled subsequently
  • simply designed protective cap made of plastic or rubber, which is attached to the coupling body by means of a strap
  • usually no vibration protection against self-loosening of the cap
  • risk of dirt entering the hydraulic system after loosening or loss of the protective cap
     

Variety of variants and installation options

  • flat-face diagnostic push-to-connect couplings are available with a wide variety of male and female threads and sealing types, which are primarily used in North America

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Head of Marketing Communications at STAUFF Group
Boris Mette
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