Remove sku column from Magento 2 invoice and pdf

Edit the file
/vendor/magento/module-sales/Model/Order/Pdf/Items/Invoice/DefaultInvoice.php

Inside function draw(), remove/comment following code:

   // draw SKU
        $lines[0][] = [
            'text' => $this->string->split($this->getSku($item), 17),
            'feed' => 290,
            'align' => 'right',
        ];

To remove the SKU header in table header, edit the file
/vendor/magento/module-sales/Model/Order/Pdf/Invoice.php

//$lines[0][] = ['text' => __('SKU'), 'feed' => 290, 'align' => 'right'];

and copy the file vendor/magento/module-sales/view/frontend/templates/email/items/order/default.phtml
to app/design/your/theme/Magento_Sales/templates/email/items/order/default.phtml
and remove the code

<p class="sku"><?= /* @escapeNotVerified */  __('SKU') ?>: <?= $block->escapeHtml($block->getSku($_item)) ?></p>