ZUFEK
Identify the locking system
Nylon-type patches and adhesive-based systems use different mechanisms. State the approved system or provide the functional requirements for a proposal. Avoid treating every pre-applied material as the same product simply because it appears as a patch on the thread.
Define the application area
Specify location, coverage and any surfaces that must remain clear. Include thread length and the intended mating engagement. A patch applied to the wrong zone may not interact with the mating component in the same way as the approved sample or assembly.
Describe assembly and service conditions
State the intended mating material, installation process, exposure conditions and any reuse requirement. These inputs help the supplier review compatibility. Do not assume a locking feature establishes the joint clamp load or eliminates the need to define the tightening method.
Agree the verification and handling
Where torque behavior is required, define the test method and acceptance conditions. Include packaging and handling restrictions that protect the applied feature. Records should distinguish the base screw specification from the additional locking process so repeat orders preserve both.
Specification example
For a screw with a short working engagement, show where the mating thread sits in the installed condition. This helps ensure the specified patch zone actually overlaps the intended interface.
RFQ checklist
- Approved locking system
- Patch position and coverage
- Mating thread and engagement
- Assembly and reuse conditions
- Torque behavior and handling criteria
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.