ZUFEK
Define the mating hole
Provide hole shape, dimensions, corner condition and panel thickness. Explain whether the neck is intended to enter freely or engage during installation. The behavior depends on both the neck and the surrounding material, not simply the width across flats.
Control neck depth and transition
Specify square-neck length and its relationship to the head underside. Show transitions that affect seating in the panel. A neck that is too long for the stack can interfere with the nut-side assembly even when the head and thread dimensions are correct.
Review the domed head and bearing face
Head diameter and height affect appearance, clearance and the supporting footprint. Identify visible surfaces and any finish requirements. A smooth dome does not define the underside contact, so include the seating details that matter to the connection.
Agree the finished fit
Forming variation, coating and hole condition can influence assembly. Inspect the neck in the supplied finish and define any functional fit or anti-rotation check. Do not use a visual comparison with a standard carriage bolt as the only acceptance method for a custom neck.
Specification example
When adapting a carriage bolt to a thinner panel, review neck depth and the full clamp stack. Changing only the thread length may leave the actual seating problem unresolved.
RFQ checklist
- Mating square hole and panel thickness
- Neck width and depth
- Under-head transitions
- Finished head envelope
- Fit and anti-rotation acceptance
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.