ZUFEKComplete internal geometry
Show all axial bores, side intersections, wall sections and sealing interfaces.
BORES, EDGES & CLEANLINESS
Fluid Control & Pneumatic Equipment
Hollow, cross-drilled and taper-related custom components for application-specific passages, fixtures and connection interfaces.
Discuss your application
Burr and cleanliness control
Define internal edge condition, permitted residues and any specified cleanliness acceptance method.
Functional verification
Specify medium compatibility and any required pressure, flow or leak test with defined conditions.
Distinguish retaining, flow and sealing functions
A hollow screw can provide a passage without being the sealing element. Show where the medium flows, where the seal acts and which feature retains the assembly.
| Assembly function | Specify with the mating parts | Acceptance and next review |
|---|---|---|
| Retain a cover or component | Define the bearing face, clamped stack, mating thread and load case. Identify any separate seal or gasket in the assembly. Custom Flange Screws | Check seating and usable thread engagement. Define joint acceptance independently of the visible fastener profile. Thread Rolling, Cutting & Tapping |
| Provide an internal passage | Show the complete bore and cross-holes, remaining wall, internal edges and access for cleaning. State the medium and required flow function. Hollow & Through-Hole Screws | Inspect hidden intersections at a suitable process stage. Agree any flow and cleanliness tests against the specified passage. Cleaning, Locking & Assembly |
| Form part of a sealing joint | Identify the seal type, mating seat, contact finish and assembly condition. State the medium, temperature and pressure conditions for the application. Special Head Screws | Define the test setup, duration, measurement and pass criteria for any specified leak or pressure test. An open-bore inspection is a different check. Plan functional tests and records |
Change example: add a radial passage
A new cross-hole changes both the local section and the internal edge that needs finishing. Review the intersection before setting the deburring and cleaning sequence. Agree how that hidden area is checked while it remains accessible, then retain the finished dimensions and any specified functional-test record. No pressure capability follows from the product name or a successful dimensional screen.
Design-review examples, not customer delivery records. Select the actual limits and checks for the ordered assembly.
Define bore geometry and internal-edge acceptanceRelevant fastener structures
Material options to review
Manufacturing and acceptance
For a passage part, provide the internal section and sealing arrangement. A through hole or taper does not by itself establish a pressure or leak-tightness rating.
Examples describe application requirements. Material suitability, production scope and verification are confirmed against the approved drawing.
Prepare a clearer project specification.
Complete RFQ checklist ↗CONNECTED SPECIFICATION TOPICS
Connect the part to its requirements.
Review these related topics for this design or route. Grade, treatment, geometry and acceptance remain drawing-specific.
ENGINEERING GUIDE
Tapered screws: defining the mating seat ↗
A taper works against a corresponding surface. Its angle, axial position and relationship to the thread must be considered with the mating component.
ENGINEERING GUIDETechnical cleanliness: writing a useful fastener requirement ↗
Cleanliness becomes a technical requirement when contamination can affect the assembly. Define what needs to be removed, how it is measured and how the clean condition is protected.
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