ZUFEK
Taper contact and seating position
State the taper definition, datum, contact length and mating geometry. Show where the part should seat and which dimension controls that position. A taper used for location does not automatically provide sealing; any sealing requirement needs defined surfaces, conditions and verification.
Review the route before fixing the quotation
For tapered shank & cone screws, review Swiss-Type & CNC Turning, Secondary & Precision Operations, CCD Vision & Dimensional Inspection against the drawing and quantity. Identify which features can be produced in the initial shape and which require a separate setup. A change to a functional shoulder, bore, drive or thread can change the proposed route as well as the inspection effort.
The drawing review should resolve taper definition; mating surface; thread relationship. Keep material condition and finishing allowance attached to those requirements. Define the acceptance condition for critical features and approve any proposed dimensional change before comparing samples with the original assembly.
From drawing to approved samples
Sealing performance requires a matched design and verification; a taper alone does not establish leak tightness. Identify the drawing revision, prototype quantity and expected repeat demand. Where the first part is based on an existing sample, separately confirm material and hidden features rather than inferring them from appearance.
The typical sampling lead time, including tooling, is approximately 10–15 days. The schedule is confirmed after drawing review and agreement on the sample specification; material availability, special treatment and inspection requirements can affect the confirmed date. Confirm when the agreed schedule starts in the quotation. Sample approval and repeat-production delivery are separate milestones.