Question

How to disable sorting and filtering on a column in Magento grid

Answer 1

The easiest way is to do it in _prepareColumns() method.

  $this->addColumn('item', array(
      'header'    => Mage::helper('module')->__('Object'),
      'index'     => 'item',
      'filter'    => false,
      'sortable'  => false
  ));