ZUFEK
Identify which feature locates
Explain whether the pin establishes lateral position while the screw supplies clamp load, or whether another feature controls the assembly. Include the mating hole and seating surface. Without that information, a manufacturer cannot tell which relationships are functionally critical.
Define the pin position and orientation
Specify pin diameter, projection and position relative to the selected reference features. An offset pin may also need angular orientation to the head or drive. Use a clear datum scheme so machining and inspection establish the same relationship.
Review the installation sequence
Show how the pin enters its hole before or during thread engagement. Consider surrounding clearance and any movement available in the mating components. A single component can be dimensionally correct but difficult to install if the assembly sequence was not considered.
Check the complete functional geometry
Inspect pin dimensions, position and relevant seating faces. If a functional assembly check is used, document the mating reference and acceptance method. Do not rely on the appearance of the pin or successful thread engagement as proof that the locating requirement is satisfied.
Specification example
For a screw with a pin under its flange, provide the hole pattern and the flange seating face. These details allow the pin location to be evaluated in the same assembly condition in which it will operate.
RFQ checklist
- Locating versus clamping function
- Pin diameter and projection
- Position and angular datums
- Mating hole and assembly sequence
- Functional acceptance reference
Use the RFQ preparation checklist, then submit your drawing for review. For acceptance requirements, see quality planning.
General guidance only. Material properties, tolerances, standards and manufacturing feasibility must be verified for the actual specification. This article does not establish a product performance guarantee.