Microswitch nut M4 DIN 934-A2 for pressure washer (12138)
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  • Microswitch nut M4 DIN 934-A2 for pressure washer (12138)

Nut M4 DIN 934-A2

12138
0.7 x 0.3 x 0.7 cm
zł2.85
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The M4 DIN 934-A2 microswitch nut is a standard M4 hex nut used to fasten a microswitch or related mounting hardware in the unit. The A2 grade refers to stainless steel, which is useful in environments exposed to moisture and water-typical for pressure-washer servicing.

MPN / reference: 12138
Thread size: M4
Standard: DIN 934
Material version: A2

APPLICATION

The nut is used in typical assembly and service work:

  • fastening the microswitch in the control system,
  • restoring complete mounting after the component has been removed,
  • replacing the nut after thread damage or corrosion,
  • repairs of control elements and covers where an M4 thread is used.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Consider replacing the nut when you notice:

  • worn or damaged thread that prevents proper tightening,
  • corrosion or seized connection (even A2 can be challenged in harsh environments),
  • nut deformation caused by using the wrong tool,
  • microswitch looseness due to insufficient clamping,
  • inability to achieve stable fastening after reassembly.

HOW TO CHOOSE THE RIGHT PART

Selection should be unambiguous:

  • confirm thread size: M4,
  • verify the standard: DIN 934 (nut shape and height),
  • confirm the material version: A2,
  • check the manufacturer number: MPN 12138,
  • compare with the removed part if this mounting point requires a specific nut height.

In control-component mounting, secure retention and resistance to operating conditions matter-choosing a standard-compliant part reduces installation issues.

COMPATIBILITY

Select the nut according to M4 DIN 934-A2 parameters and compatibility with the specific microswitch mounting point in the machine. If in doubt, compare height and execution with the removed part to maintain correct clamping force and microswitch positioning.

[faq]

What does “A2” mean in DIN 934-A2?|A2 is a stainless-steel grade used for fasteners. In practice, it provides better corrosion resistance in humid environments than plain steel.

Can I use a regular M4 nut instead of the A2 version for the microswitch?|Mechanically it will often fit, but in a washer environment (moisture/water) standard fasteners corrode faster and can seize. A2 is the safer choice in operation.

Why can a loose microswitch cause issues in machine operation?|A microswitch is a control component-if it shifts or is mechanically unstable, it may not actuate at the right moment or may work intermittently.

How can I avoid damaging the M4 thread during installation?|Start the nut straight (avoid cross-threading) and don’t overtighten. If you feel resistance immediately, check the condition of both the screw and the nut.

How can I be sure DIN 934 is the correct standard for this mounting point?|Most reliably by comparing with the removed part and matching the DIN 934-A2 specification. Some locations may require a low-profile or self-locking nut, so keeping the same type as the original is best.

[/faq]

Technical data

Model

WS-RP 1400 TS

Model

Quadro 12/150 TST

Model

Quadro 800 TST

Model

Therm-RP 1400 AT

Model

Therm-RP 1200

Model

Therm 895

Model

WS-RP 1600 TS

Model

Therm 1525-1

Model

Quadro 899 TST

Model

Therm-RP 1600 AT

Model

Therm-RP 1200 T

Model

Therm 1165

Model

WSC-RP 1000 TS

Model

WS 1000 TS

Model

2175 TST

Model

E-Therm 500 M 18

Model

HD 7/122 TS

Model

Therm 715

Model

1152 TST

Model

WSC-RP 1200 TS

Model

WS 1200 TS

Model

2175 TS

Model

E-Therm 500 M 18 T

Model

HD 9/80 TS

Model

Bully 980 TS

Model

2160 TST

Model

WSC-RP 1400 TS

Model

Therm 895 ST

Model

2195 TS

Model

E-Therm 500 M 24

Model

HD 12/130 TS

Model

Bully 980 TST

Model

Quadro 1000 TST

Model

Quadro 1200 TST

Model

WSC-RP 1600 TS

Model

Therm 1165 ST

Model

2195 TST

Model

E-Therm 500 M 24 T

Model

Quadro 11/140 TST

Model

W 11/135

Model

Therm 895-1

Model

LX-RP 1000 TST

Model

Profi 15/120 TST

Model

Quickly

Model

E-Therm 603 M 36

Model

2160 TS

Model

W 13/230

Model

Therm 1165-1

Model

LX-RP 1200 TST

Model

Junior 140

Model

HD 10/122 TS

Model

E-Therm 603 M 36 T

Model

1152 TS

Model

W 15/200

Model

1050 TS

Model

LX-RP 1400 TST

Model

Junior 120

Model

Profi 160 TST

Model

E-Therm 873 M 36

Model

Quadro 1000 TS

Model

W 19/160

Model

1050 TST

Model

LX-RP 1600 TST

Model

K 185

Model

Profi 175 TST

Model

E-Therm 873 M 36 T

Model

Quadro 1200 TS

Model

K 1151 T

Model

Quadro 1500 TS

Model

X10/140 TST

Model

Therm-RP 1000

Model

K 125

Model

Profi 195 TST

Model

E-Therm 873 M 48

Model

Primus 1000 TST

Model

Quadro 1500 TST

Model

X8/150 TST

Model

Therm-RP 1000 T

Model

K 115

Model

Quadro 9/170 TST

Model

E-Therm 873 M 48 T

Model

Primus 1000 TS AT

Model

WS 800 TS

Model

X A15 TST

Model

Therm-RP 1600 T

Model

Therm 1017 T

Model

Bully 1000

Model

Primus 1200 TST

Model

K 1151

Model

Quadro 799 TST

Model

Therm-RP 1600

Model

Therm 1017

Model

Bully 1200

Model

Primus 1200 TS AT

Model

Bully 1180 T

Model

Quadro 599 TST

Model

Therm-RP 1000 AT

Model

Therm-RP 1400

Model

1154 TST

Model

WS-RP 1000 TS

Model

WS-RP 1200 TS

Model

Bully 1180 TST

Model

1050 P

Model

Therm-RP 1200 AT

Model

Therm-RP 1400 T

Model

X A17 TST

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