: Distinguished by its "X" or plus-shaped tip, it is designed for Phillips screws. This design is self-centering, which prevents the driver from wobbling and reduces the risk of slipping sideways compared to slotted screws. Contextual Usage in Maintenance
: On equipment like the 6800 Series Single Column Table Model, page or section 121 details testing limit stops, a task requiring minimal tools to ensure the crosshead moves safely. 121 : Only a Slotted and a Crosshead Screwdrive...
Phillips and Pozidriv cross-head screws – explained in simple terms : Distinguished by its "X" or plus-shaped tip,
: Many mass-produced items use these two drives for user-accessible parts, while reserving more complex drives like Torx or Hex for internal components to discourage unauthorized dismantling. Best Practices for the Task Phillips and Pozidriv cross-head screws – explained in
The phrase appears to be a direct instruction or requirement from a technical manual or assembly guide, likely for an Instron testing system. In such contexts, "121" often refers to a specific procedure or page, such as testing limit stops or general maintenance, where these two tools are the only ones required. The Two Essential Driving Tools
When a manual specifies using only these two tools, it typically implies a "tool-free" or "basic-tool" maintenance philosophy intended for the operator rather than a specialized technician. For example: