An ISO 7035 nut is a hex nut featuring a cylindrical "crown" or a series of vertical slots (grooves) cut into its top face. It functions as a fail-safe, anti-loosening hardware element.
Given the ambiguity, your first step is to determine which standard you need: iso 7035 pdf
Standards are living documents. ISO 7035 is subject to systematic review, typically every five years. When searching for the PDF, one must verify they are looking at the current edition. For example, the standard may have been updated to account for new metallurgical advancements—modern alloys allow for smaller sockets to handle higher torque, necessitating updates to the tolerance charts. Using a 20-year-old PDF could result in specifying a fastener that underperforms in a modern high-stress application. An ISO 7035 nut is a hex nut
Some distributors list the document simply as (without the “/TR” designation). While technically imprecise, this listing almost always refers to the pipeline technical report, as the fastener standard is not dated 2024. Always check the title to confirm you are buying the correct document. ISO 7035 is subject to systematic review, typically
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The defining feature of an ISO 7035 nut is the series of slots, or "crenellations," cut into its top, giving it the appearance of a castle's parapet. This design is not aesthetic; it is purely functional. Positive Locking: