It includes tables for:
This ensures interchangeability between manufacturers who claim compliance.
To understand the significance of this document, one must first decode the ISO numbering system. ISO standards starting with the number 70 typically pertain to fasteners—specifically, bolts, screws, studs, and nuts. The numbering is not arbitrary; it categorizes the standard into a specific family of mechanical hardware.
ISO 7035 is technically defined as part of the ISO 703 series, which relates to Hexagon socket set screws (often referred to generically as Allen screws or grub screws). While many ISO standards focus on the dimensions of the screw head or the length of the thread, ISO 7035 specifically addresses the Hexagon Sockets. iso 7035 pdf
More precisely, this standard (often cross-referenced with ISO 4762 for socket head cap screws or ISO 4026 for set screws) specifies the dimensions and tolerances of the internal hexagon driving feature. This is the six-sided recess in the head of a screw that allows a hex key (Allen wrench) to drive it.
Here are the official channels where you can purchase and download the ISO 7035 PDF instantly:
| Source | Region | Digital Format | Typical Price (USD) | |--------|--------|----------------|---------------------| | ISO Store (iso.org) | Global | PDF + Watermark | ~130 - 170 | | ANSI (webstore.ansi.org) | USA | Secure PDF | ~150 - 190 | | BSI (bsigroup.com) | UK | DRM-protected PDF | ~160 - 200 | | DIN (din.de) | Germany | PDF | ~140 - 180 | | SAE (sae.org) | Global (focus on mobility) | PDF | ~160 | It includes tables for:
Step-by-step purchase:
Some national bodies offer a "PDF + Print" bundle, but the standalone PDF is most common for engineers.
The existence of a dedicated PDF standard for a small metal recess might seem like bureaucratic overkill to the layperson, but in precision engineering, it is vital. The "Hexagon Socket" is a high-torque drive style. If the socket is too small, the wrench will wobble, stripping the internal walls and ruining the fastener. If the socket is too shallow, the wrench cannot be inserted deeply enough to apply the necessary torque. If the corners are not rounded correctly, stress concentrations can lead to premature failure. Without this standard
ISO 7035 provides the exact mathematical parameters for these sockets. It dictates:
Without this standard, a hex key from a manufacturer in Germany might not fit a screw produced in Japan, leading to assembly line halts and massive inefficiencies.
ISO 7035 is an international standard titled: "Connections for fluid power and general use — Port connections with ISO 228-1 threads with O-ring sealing — Part 1: Port for threaded connections with O-ring seal."
To break this down into simpler terms: