A bolt with a single raised dash on the head is classified as what type of bolt?

A bolt with a single raised dash on the head is classified as an AN corrosion-resistant steel bolt. This classification indicates that the bolt meets specific standards for use in applications requiring corrosion resistance, typically associated with aerospace or high-performance environments. The raised dash serves as a distinctive marker that helps identify the material and type of bolt, ensuring it is appropriate for its intended use.

This type of identification is particularly important in industries where bolts are subjected to harsh conditions, as the correct material is crucial for maintaining structural integrity and performance. The conventions used in marking bolts, such as the dash system, help facilitate easy identification for engineers and technicians, ensuring that the right materials are chosen for assembly and maintenance tasks.

In contrast, other classifications like Grade 5, aluminum bolts, or structural bolts are indicative of different materials or strength ratings, which may not necessarily be associated with corrosion resistance or the specific applications called for by AN standards.