ZUFEK
Provide the complete slot section
Measure the opening, internal width, depth and any corner radii. Explain which dimensions are controlled and whether the profile varies along the assembly. A nominal extrusion family or a top-view photograph may leave important internal clearances undefined.
Explain the insertion method
Some heads enter from a slot end; others must pass through the opening and rotate. These are different geometric requirements. Show the intended assembly sequence and any end stops or surrounding parts that prevent the movement assumed during installation.
Review contact and anti-rotation
Head thickness, bearing faces and neck geometry influence how the bolt seats in the slot. Specify the required clearances and contact surfaces. A head that can be inserted is not automatically suitable for the required clamping load or resistance to rotation.
Check the finished condition
Coating and edge finishing can alter the available clearance. Agree the final head envelope and inspect the relevant features after finishing. A trial fit in an approved mating section may be useful, but it should support clearly documented dimensional and functional requirements.
Specification example
For a bolt that must rotate inside an aluminum profile, provide the rotation envelope as well as the installed position. This identifies interference that a single assembled view may hide.
RFQ checklist
- Slot cross-section and radii
- Insertion and rotation sequence
- Head and neck clearances
- Finished coating allowance
- Agreed fit and clamping checks
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.