"door bolt" - Translation from English to Arabic

Put a chain across the door, bolt it shut, think they're impregnable.
وضع سلاسل عبر الباب و اقفالها بإحكام، فيعتقدون بأنهم منيعون

The grating of the door bolt was like a sword stroke to my ears.
حاجز مزلاج الباب كان مثل ضربة السيف فى اُذنى