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Map the shoulder to each mating component
Identify which face supports each component in the stack. Include the mating parts or a simplified section showing their position. This helps separate functional locating shoulders from machining transitions that do not establish an assembly position.
Choose a consistent reference scheme
Baseline dimensions and chained dimensions communicate different relationships. The responsible designer should select the scheme that matches the required function and tolerance analysis. Avoid adding a closed chain of conflicting controlled dimensions simply to fill every gap on the drawing.
Review transitions and tool access
Small reliefs, corner radii and edge breaks can affect how a component seats against a shoulder. Show the mating corner conditions and identify features that must remain clear. Secondary machining or finishing needs to preserve the approved seating geometry.
Inspect the relevant relationships
A collection of individual lengths does not always establish the functional stack. Agree measurement references and checks for the distances that matter. Include final coating and treatment conditions when they can affect the supplied diameters or seating surfaces.
Specification example
For two bearings separated by a shoulder, identify the bearing seating faces and the required spacing between them. This is more useful than applying the same tight tolerance to every unrelated axial dimension.
RFQ checklist
- Mating stack or section view
- Functional locating shoulders
- Datum-based axial dimensions
- Corner and relief requirements
- Final-condition inspection references
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.