diff --git a/src/Mod/Fem/App/FemConstraintContact.cpp b/src/Mod/Fem/App/FemConstraintContact.cpp
index d49c67c262..f4d4fa5268 100644
--- a/src/Mod/Fem/App/FemConstraintContact.cpp
+++ b/src/Mod/Fem/App/FemConstraintContact.cpp
@@ -33,9 +33,31 @@ PROPERTY_SOURCE(Fem::ConstraintContact, Fem::Constraint)
 ConstraintContact::ConstraintContact()
 {
     /*Note: Initialise parameters here*/
-    ADD_PROPERTY(Slope, (0.0));
-    ADD_PROPERTY(Friction, (0.0));
-    /* */
+    ADD_PROPERTY_TYPE(Slope,
+                      (0.0),
+                      "ConstraintContact",
+                      App::PropertyType(App::Prop_None),
+                      "Contact stiffness");
+    ADD_PROPERTY_TYPE(Adjust,
+                      (0.0),
+                      "ConstraintContact",
+                      App::PropertyType(App::Prop_None),
+                      "Node clearance adjustment limit");
+    ADD_PROPERTY_TYPE(Friction,
+                      (false),
+                      "ConstraintContact",
+                      App::PropertyType(App::Prop_None),
+                      "Enable friction interaction");
+    ADD_PROPERTY_TYPE(FrictionCoefficient,
+                      (0.0),
+                      "ConstraintContact",
+                      App::PropertyType(App::Prop_None),
+                      "Friction coefficient");
+    ADD_PROPERTY_TYPE(StickSlope,
+                      (0.0),
+                      "ConstraintContact",
+                      App::PropertyType(App::Prop_None),
+                      "Stick slope");
 
     ADD_PROPERTY_TYPE(Points,
                       (Base::Vector3d()),
@@ -47,6 +69,7 @@ ConstraintContact::ConstraintContact()
                       "ConstraintContact",
                       App::PropertyType(App::Prop_ReadOnly | App::Prop_Output),
                       "Normals where symbols are drawn");
+    /* */
     Points.setValues(std::vector<Base::Vector3d>());
     Normals.setValues(std::vector<Base::Vector3d>());
 }
@@ -77,3 +100,28 @@ void ConstraintContact::onChanged(const App::Property* prop)
         }
     }
 }
+
+void ConstraintContact::handleChangedPropertyType(Base::XMLReader& reader,
+                                                  const char* typeName,
+                                                  App::Property* prop)
+{
+    if (prop == &Slope && strcmp(typeName, "App::PropertyFloat") == 0) {
+        App::PropertyFloat oldSlope;
+        oldSlope.Restore(reader);
+        // old slope value stored as MPa/mm equivalent to 1e3 kg/(mm^2*s^2)
+        Slope.setValue(oldSlope.getValue() * 1000);
+
+        // stick slope internally generated as slope/10
+        StickSlope.setValue(Slope.getValue() / 10);
+    }
+    else if (prop == &Friction && strcmp(typeName, "App::PropertyFloat") == 0) {
+        App::PropertyFloat oldFriction;
+        oldFriction.Restore(reader);
+        FrictionCoefficient.setValue(oldFriction.getValue());
+
+        Friction.setValue(oldFriction.getValue() > 0 ? true : false);
+    }
+    else {
+        Constraint::handleChangedPropertyType(reader, typeName, prop);
+    }
+}
diff --git a/src/Mod/Fem/App/FemConstraintContact.h b/src/Mod/Fem/App/FemConstraintContact.h
index 60c82cfbf9..68b17eef8b 100644
--- a/src/Mod/Fem/App/FemConstraintContact.h
+++ b/src/Mod/Fem/App/FemConstraintContact.h
@@ -50,8 +50,11 @@ public:
      * This is only the definitions of the variables
      ******/
     // ex.
-    App::PropertyFloat Slope;
-    App::PropertyFloat Friction;
+    App::PropertyStiffnessDensity Slope;
+    App::PropertyLength Adjust;
+    App::PropertyBool Friction;
+    App::PropertyFloat FrictionCoefficient;
+    App::PropertyStiffnessDensity StickSlope;
 
     // etc
     /* */
@@ -64,6 +67,9 @@ public:
 
 protected:
     void onChanged(const App::Property* prop) override;
+    void handleChangedPropertyType(Base::XMLReader& reader,
+                                   const char* typeName,
+                                   App::Property* prop) override;
 };
 
 }  // namespace Fem
diff --git a/src/Mod/Fem/Gui/Command.cpp b/src/Mod/Fem/Gui/Command.cpp
index 82f82e1a3f..0f5f1d8d1c 100644
--- a/src/Mod/Fem/Gui/Command.cpp
+++ b/src/Mod/Fem/Gui/Command.cpp
@@ -250,10 +250,19 @@ void CmdFemConstraintContact::activated(int)
               "App.activeDocument().addObject(\"Fem::ConstraintContact\",\"%s\")",
               FeatName.c_str());
     doCommand(Doc,
-              "App.activeDocument().%s.Slope = 1000000.00",
+              "App.activeDocument().%s.Slope = \"1e6 GPa/m\"",
               FeatName.c_str());  // OvG: set default not equal to 0
     doCommand(Doc,
-              "App.activeDocument().%s.Friction = 0.0",
+              "App.activeDocument().%s.Adjust = 0.0",
+              FeatName.c_str());  // OvG: set default equal to 0
+    doCommand(Doc,
+              "App.activeDocument().%s.Friction = False",
+              FeatName.c_str());  // OvG: set default equal to 0
+    doCommand(Doc,
+              "App.activeDocument().%s.FrictionCoefficient = 0.0",
+              FeatName.c_str());  // OvG: set default equal to 0
+    doCommand(Doc,
+              "App.activeDocument().%s.StickSlope = \"1e4 GPa/m\"",
               FeatName.c_str());  // OvG: set default not equal to 0
     doCommand(Doc,
               "App.activeDocument().%s.Scale = 1",
diff --git a/src/Mod/Fem/Gui/TaskFemConstraintContact.cpp b/src/Mod/Fem/Gui/TaskFemConstraintContact.cpp
index cc15da6dbb..d515c44438 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintContact.cpp
+++ b/src/Mod/Fem/Gui/TaskFemConstraintContact.cpp
@@ -91,14 +91,36 @@ TaskFemConstraintContact::TaskFemConstraintContact(ViewProviderFemConstraintCont
 
     std::vector<App::DocumentObject*> Objects = pcConstraint->References.getValues();
     std::vector<std::string> SubElements = pcConstraint->References.getSubValues();
-    double slope = pcConstraint->Slope.getValue();
-    double friction = pcConstraint->Friction.getValue();
+
+    bool friction = pcConstraint->Friction.getValue();
 
     // Fill data into dialog elements
-    ui->spSlope->setMinimum(1.0);
-    ui->spSlope->setValue(slope);
-    ui->spFriction->setValue(friction);
+    ui->spbSlope->setUnit(pcConstraint->Slope.getUnit());
+    ui->spbSlope->setMinimum(0);
+    ui->spbSlope->setMaximum(FLOAT_MAX);
+    ui->spbSlope->setValue(pcConstraint->Slope.getQuantityValue());
+    ui->spbSlope->bind(pcConstraint->Slope);
 
+    ui->spbAdjust->setUnit(pcConstraint->Adjust.getUnit());
+    ui->spbAdjust->setMinimum(0);
+    ui->spbAdjust->setMaximum(FLOAT_MAX);
+    ui->spbAdjust->setValue(pcConstraint->Adjust.getQuantityValue());
+    ui->spbAdjust->bind(pcConstraint->Adjust);
+
+    ui->ckbFriction->setChecked(friction);
+
+    ui->spbFrictionCoeff->setMinimum(0);
+    ui->spbFrictionCoeff->setMaximum(FLOAT_MAX);
+    ui->spbFrictionCoeff->setValue(pcConstraint->FrictionCoefficient.getValue());
+    ui->spbFrictionCoeff->setEnabled(friction);
+    ui->spbFrictionCoeff->bind(pcConstraint->FrictionCoefficient);
+
+    ui->spbStickSlope->setUnit(pcConstraint->StickSlope.getUnit());
+    ui->spbStickSlope->setMinimum(0);
+    ui->spbStickSlope->setMaximum(FLOAT_MAX);
+    ui->spbStickSlope->setValue(pcConstraint->StickSlope.getQuantityValue());
+    ui->spbStickSlope->setEnabled(friction);
+    ui->spbStickSlope->bind(pcConstraint->StickSlope);
     /* */
 
     ui->lw_referencesMaster->clear();
@@ -136,6 +158,11 @@ TaskFemConstraintContact::TaskFemConstraintContact(ViewProviderFemConstraintCont
             this,
             &TaskFemConstraintContact::removeFromSelectionMaster);
 
+    connect(ui->ckbFriction,
+            &QCheckBox::toggled,
+            this,
+            &TaskFemConstraintContact::onFrictionChanged);
+
     updateUI();
 }
 
@@ -428,6 +455,12 @@ void TaskFemConstraintContact::onReferenceDeletedMaster()
     TaskFemConstraintContact::removeFromSelectionMaster();
 }
 
+void TaskFemConstraintContact::onFrictionChanged(bool state)
+{
+    ui->spbFrictionCoeff->setEnabled(state);
+    ui->spbStickSlope->setEnabled(state);
+}
+
 const std::string TaskFemConstraintContact::getReferences() const
 {
     int rowsSlave = ui->lw_referencesSlave->model()->rowCount();
@@ -443,15 +476,29 @@ const std::string TaskFemConstraintContact::getReferences() const
     return TaskFemConstraint::getReferences(items);
 }
 
-/* Note: */
-double TaskFemConstraintContact::get_Slope() const
+const std::string TaskFemConstraintContact::getSlope() const
 {
-    return ui->spSlope->rawValue();
+    return ui->spbSlope->value().getSafeUserString().toStdString();
 }
 
-double TaskFemConstraintContact::get_Friction() const
+const std::string TaskFemConstraintContact::getAdjust() const
 {
-    return ui->spFriction->value();
+    return ui->spbAdjust->value().getSafeUserString().toStdString();
+}
+
+bool TaskFemConstraintContact::getFriction() const
+{
+    return ui->ckbFriction->isChecked();
+}
+
+double TaskFemConstraintContact::getFrictionCoeff() const
+{
+    return ui->spbFrictionCoeff->value();
+}
+
+const std::string TaskFemConstraintContact::getStickSlope() const
+{
+    return ui->spbStickSlope->value().getSafeUserString().toStdString();
 }
 
 void TaskFemConstraintContact::changeEvent(QEvent*)
@@ -478,7 +525,7 @@ void TaskDlgFemConstraintContact::open()
     // a transaction is already open at creation time of the panel
     if (!Gui::Command::hasPendingCommand()) {
         QString msg = QObject::tr("Contact constraint");
-        Gui::Command::openCommand((const char*)msg.toUtf8());
+        Gui::Command::openCommand(static_cast<const char*>(msg.toUtf8()));
         ConstraintView->setVisible(true);
         Gui::Command::runCommand(
             Gui::Command::Doc,
@@ -497,13 +544,25 @@ bool TaskDlgFemConstraintContact::accept()
 
     try {
         Gui::Command::doCommand(Gui::Command::Doc,
-                                "App.ActiveDocument.%s.Slope = %f",
+                                "App.ActiveDocument.%s.Slope = \"%s\"",
                                 name.c_str(),
-                                parameterContact->get_Slope());
+                                parameterContact->getSlope().c_str());
         Gui::Command::doCommand(Gui::Command::Doc,
-                                "App.ActiveDocument.%s.Friction = %f",
+                                "App.ActiveDocument.%s.Adjust = \"%s\"",
                                 name.c_str(),
-                                parameterContact->get_Friction());
+                                parameterContact->getAdjust().c_str());
+        Gui::Command::doCommand(Gui::Command::Doc,
+                                "App.ActiveDocument.%s.Friction = %s",
+                                name.c_str(),
+                                parameterContact->getFriction() ? "True" : "False");
+        Gui::Command::doCommand(Gui::Command::Doc,
+                                "App.ActiveDocument.%s.FrictionCoefficient = %f",
+                                name.c_str(),
+                                parameterContact->getFrictionCoeff());
+        Gui::Command::doCommand(Gui::Command::Doc,
+                                "App.ActiveDocument.%s.StickSlope = \"%s\"",
+                                name.c_str(),
+                                parameterContact->getStickSlope().c_str());
         std::string scale = parameterContact->getScale();  // OvG: determine modified scale
         Gui::Command::doCommand(Gui::Command::Doc,
                                 "App.ActiveDocument.%s.Scale = %s",
diff --git a/src/Mod/Fem/Gui/TaskFemConstraintContact.h b/src/Mod/Fem/Gui/TaskFemConstraintContact.h
index cc7891a667..b5f78a6ec2 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintContact.h
+++ b/src/Mod/Fem/Gui/TaskFemConstraintContact.h
@@ -46,8 +46,11 @@ public:
                                       QWidget* parent = nullptr);
     ~TaskFemConstraintContact() override;
     const std::string getReferences() const override;
-    double get_Slope() const;
-    double get_Friction() const;
+    const std::string getAdjust() const;
+    const std::string getSlope() const;
+    bool getFriction() const;
+    const std::string getStickSlope() const;
+    double getFrictionCoeff() const;
 
 private Q_SLOTS:
     void onReferenceDeletedSlave();
@@ -56,12 +59,12 @@ private Q_SLOTS:
     void removeFromSelectionSlave();
     void addToSelectionMaster();
     void removeFromSelectionMaster();
+    void onFrictionChanged(bool);
 
 protected:
     void changeEvent(QEvent* e) override;
 
 private:
-    // void onSelectionChanged(const Gui::SelectionChanges& msg);
     void updateUI();
     std::unique_ptr<Ui_TaskFemConstraintContact> ui;
 };
diff --git a/src/Mod/Fem/Gui/TaskFemConstraintContact.ui b/src/Mod/Fem/Gui/TaskFemConstraintContact.ui
index 0d86b655fe..3fca07dde2 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintContact.ui
+++ b/src/Mod/Fem/Gui/TaskFemConstraintContact.ui
@@ -135,56 +135,123 @@
      </property>
     </widget>
    </item>
+
    <item>
-    <layout class="QHBoxLayout" name="horizontalLayout_3">
-     <item>
-      <widget class="QLabel" name="label">
-       <property name="text">
-        <string>Contact Stiffness</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="Gui::InputField" name="spSlope">
-       <property name="singleStep">
-        <double>1.000000000000000</double>
-       </property>
-       <property name="maximum">
-        <double>1000000000.000000000000000</double>
-       </property>
-       <property name="unit" stdset="0">
-        <string notr="true">Pa</string>
-       </property>
-       <property name="value" stdset="0">
-        <double>1000000.000000000000000</double>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-   <item>
-    <layout class="QHBoxLayout" name="horizontalLayout_2">
-     <item>
-      <widget class="QLabel" name="label_2">
-       <property name="text">
-        <string>Friction coefficient</string>
-       </property>
-      </widget>
-     </item>
-     <item>
-      <widget class="QDoubleSpinBox" name="spFriction">
-       <property name="decimals">
-        <number>2</number>
-       </property>
-       <property name="maximum">
-        <double>1.000000000000000</double>
-       </property>
-       <property name="singleStep">
-        <double>0.100000000000000</double>
-       </property>
-      </widget>
-     </item>
-    </layout>
+    <widget class="QGroupBox" name="gpbParameter">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Expanding" vsizetype="Preferred">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="toolTip">
+      <string/>
+     </property>
+     <property name="title">
+      <string>Parameters</string>
+     </property>
+     <layout class="QFormLayout" name="fltParameters">
+      <item row="0" column="0">
+       <widget class="QLabel" name="lblSlope">
+        <property name="text">
+         <string>Contact Stiffness</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="Gui::QuantitySpinBox" name="spbSlope">
+        <property name="singleStep">
+         <double>1.000000000000000</double>
+        </property>
+        <property name="maximum">
+         <double>1000000000.000000000000000</double>
+        </property>
+        <property name="unit" stdset="0">
+         <string notr="true">GPa/m</string>
+        </property>
+        <property name="value" stdset="0">
+         <double>100.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="lblAdjust">
+        <property name="text">
+         <string>Clearance Adjustment</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="Gui::QuantitySpinBox" name="spbAdjust">
+        <property name="minimum">
+         <double>0.000000000000000</double>
+        </property>
+        <property name="unit" stdset="0">
+         <string notr="true">mm</string>
+        </property>
+        <property name="value" stdset="0">
+         <double>0.000000000000000</double>
+        </property>
+        <property name="singleStep">
+         <double>0.100000000000000</double>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="0">
+       <widget class="QCheckBox" name="ckbFriction">
+        <property name="text">
+         <string>Enable Friction</string>
+        </property>
+       </widget>
+      </item>
+      <item row="3" column="0">
+       <widget class="QLabel" name="lblFrictionCoeff">
+        <property name="text">
+         <string>Friction Coefficient</string>
+        </property>
+       </widget>
+      </item>
+      <item row="3" column="1">
+       <widget class="Gui::DoubleSpinBox" name="spbFrictionCoeff">
+        <property name="decimals">
+         <number>2</number>
+        </property>
+        <property name="minimum">
+         <double>0.000000000000000</double>
+        </property>
+        <property name="value">
+         <double>0.000000000000000</double>
+        </property>
+        <property name="singleStep">
+         <double>0.100000000000000</double>
+        </property>
+       </widget>
+      </item>
+      <item row="4" column="0">
+       <widget class="QLabel" name="lblStickSlope">
+        <property name="text">
+         <string>Stick Slope</string>
+        </property>
+       </widget>
+      </item>
+      <item row="4" column="1">
+       <widget class="Gui::QuantitySpinBox" name="spbStickSlope">
+        <property name="singleStep">
+         <double>1.000000000000000</double>
+        </property>
+        <property name="maximum">
+         <double>1000000000.000000000000000</double>
+        </property>
+        <property name="unit" stdset="0">
+         <string notr="true">GPa/m</string>
+        </property>
+        <property name="value" stdset="0">
+         <double>1.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </widget>
    </item>
   </layout>
   <zorder>lbl_info_2</zorder>
@@ -194,9 +261,14 @@
  </widget>
  <customwidgets>
   <customwidget>
-   <class>Gui::InputField</class>
-   <extends>QLineEdit</extends>
-   <header>Gui/InputField.h</header>
+   <class>Gui::QuantitySpinBox</class>
+   <extends>QWidget</extends>
+   <header>Gui/QuantitySpinBox.h</header>
+  </customwidget>
+  <customwidget>
+   <class>Gui::DoubleSpinBox</class>
+   <extends>QWidget</extends>
+   <header>Gui/SpinBox.h</header>
   </customwidget>
  </customwidgets>
  <resources/>
diff --git a/src/Mod/Fem/femexamples/constraint_contact_shell_shell.py b/src/Mod/Fem/femexamples/constraint_contact_shell_shell.py
index 3e6464a041..2d2b42af80 100644
--- a/src/Mod/Fem/femexamples/constraint_contact_shell_shell.py
+++ b/src/Mod/Fem/femexamples/constraint_contact_shell_shell.py
@@ -193,9 +193,8 @@ def setup(doc=None, solvertype="ccxtools"):
         (lower_tube, "Face1"),
         (upper_tube, "Face1"),
     ]
-    con_contact.Friction = 0.0
-    # con_contact.Slope = "1000000.0 kg/(mm*s^2)"  # contact stiffness
-    con_contact.Slope = 1000000.0  # should be 1000000.0 kg/(mm*s^2)
+    con_contact.Friction = False
+    con_contact.Slope = "1000000.0 GPa/m"
     analysis.addObject(con_contact)
 
     # mesh
diff --git a/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py b/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py
index c3efe9b189..d2392d1d2a 100644
--- a/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py
+++ b/src/Mod/Fem/femexamples/constraint_contact_solid_solid.py
@@ -177,8 +177,8 @@ def setup(doc=None, solvertype="ccxtools"):
         (geom_obj, "Face7"),  # first seams slave face, TODO proof in writer code!
         (geom_obj, "Face3"),  # second seams master face, TODO proof in writer code!
     ]
-    con_contact.Friction = 0.0
-    con_contact.Slope = 1000000.0  # contact stiffness 1000000.0 kg/(mm*s^2)
+    con_contact.Friction = False
+    con_contact.Slope = "1000000.0 GPa/m"
     analysis.addObject(con_contact)
 
     # mesh
diff --git a/src/Mod/Fem/femsolver/calculix/write_constraint_contact.py b/src/Mod/Fem/femsolver/calculix/write_constraint_contact.py
index c8527975f6..a9c0bcc9dd 100644
--- a/src/Mod/Fem/femsolver/calculix/write_constraint_contact.py
+++ b/src/Mod/Fem/femsolver/calculix/write_constraint_contact.py
@@ -68,20 +68,24 @@ def write_meshdata_constraint(f, femobj, contact_obj, ccxwriter):
 def write_constraint(f, femobj, contact_obj, ccxwriter):
 
     # floats read from ccx should use {:.13G}, see comment in writer module
+    adjust = ""
+    if contact_obj.Adjust.Value > 0:
+        adjust = ", ADJUST={:.13G}".format(
+            contact_obj.Adjust.getValueAs("mm").Value)
 
     f.write(
-        "*CONTACT PAIR, INTERACTION=INT{},TYPE=SURFACE TO SURFACE\n"
-        .format(contact_obj.Name)
+        "*CONTACT PAIR, INTERACTION=INT{}, TYPE=SURFACE TO SURFACE{}\n"
+        .format(contact_obj.Name, adjust)
     )
     ind_surf = "IND" + contact_obj.Name
     dep_surf = "DEP" + contact_obj.Name
-    f.write("{},{}\n".format(dep_surf, ind_surf))
+    f.write("{}, {}\n".format(dep_surf, ind_surf))
     f.write("*SURFACE INTERACTION, NAME=INT{}\n".format(contact_obj.Name))
-    f.write("*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR\n")
-    slope = contact_obj.Slope
+    f.write("*SURFACE BEHAVIOR, PRESSURE-OVERCLOSURE=LINEAR\n")
+    slope = contact_obj.Slope.getValueAs("MPa/mm").Value
     f.write("{:.13G}\n".format(slope))
-    friction = contact_obj.Friction
-    if friction > 0:
-        f.write("*FRICTION \n")
-        stick = (slope / 10.0)
+    if contact_obj.Friction:
+        f.write("*FRICTION\n")
+        friction = contact_obj.FrictionCoefficient
+        stick = contact_obj.StickSlope.getValueAs("MPa/mm").Value
         f.write("{:.13G}, {:.13G}\n".format(friction, stick))
diff --git a/src/Mod/Fem/femtest/data/calculix/constraint_contact_shell_shell.inp b/src/Mod/Fem/femtest/data/calculix/constraint_contact_shell_shell.inp
index 437d5c7feb..4f696b5b7d 100644
--- a/src/Mod/Fem/femtest/data/calculix/constraint_contact_shell_shell.inp
+++ b/src/Mod/Fem/femtest/data/calculix/constraint_contact_shell_shell.inp
@@ -38365,10 +38365,10 @@ Efaces
 ***********************************************************
 ** Contact Constraints
 ** ConstraintContact
-*CONTACT PAIR, INTERACTION=INTConstraintContact,TYPE=SURFACE TO SURFACE
-DEPConstraintContact,INDConstraintContact
+*CONTACT PAIR, INTERACTION=INTConstraintContact, TYPE=SURFACE TO SURFACE
+DEPConstraintContact, INDConstraintContact
 *SURFACE INTERACTION, NAME=INTConstraintContact
-*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR
+*SURFACE BEHAVIOR, PRESSURE-OVERCLOSURE=LINEAR
 1000000
 
 ***********************************************************
diff --git a/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp b/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp
index 883a37b530..5d315d93ad 100644
--- a/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp
+++ b/src/Mod/Fem/femtest/data/calculix/constraint_contact_solid_solid.inp
@@ -5572,10 +5572,10 @@ Evolumes
 ***********************************************************
 ** Contact Constraints
 ** ConstraintContact
-*CONTACT PAIR, INTERACTION=INTConstraintContact,TYPE=SURFACE TO SURFACE
+*CONTACT PAIR, INTERACTION=INTConstraintContact, TYPE=SURFACE TO SURFACE
 DEPConstraintContact,INDConstraintContact
 *SURFACE INTERACTION, NAME=INTConstraintContact
-*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR
+*SURFACE BEHAVIOR, PRESSURE-OVERCLOSURE=LINEAR
 1000000
 
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