fastening

verb

1. (form-of, gerund, participle, present)present participle and gerund of fasten

noun

1. A hook or similar restraint used to fasten things together; fastener.

   “The Rail Accident Investigation Branch's preliminary examination of the site of a cement train derailment at Sheffield station on November 11 found that a series of rail fastenings had broken, some before the accident, causing the tracks to spread under the train.”