2D drawing

In practice

An RFQ with only a STEP file gets quoted to general tolerances, often ISO 2768-m or the shop's standard title block. Put critical features, datums, and GD&T on the drawing.

Related terms

STEP

STEP is a neutral 3D CAD file format defined by ISO 10303, saved as .step or .stp. It carries exact solid geometry that any CAD, CAM, or quoting system can read, which makes it the preferred file for RFQs, tooling design, and machining.

GD&T

GD&T is geometric dimensioning and tolerancing, the symbol system defined in ASME Y14.5 and ISO 1101 for controlling the form, orientation, location, and runout of part features relative to datums. It states functional intent more precisely than plus-minus dimensions and often allows larger tolerances where they do not matter.

Tolerance

Tolerance is the total amount a dimension is allowed to vary from its nominal value, such as ±0.005 in (±0.13 mm). Tighter tolerances raise cost through slower processes, extra operations, and added inspection. Hold them only on features that affect fit or function.

RFQ

An RFQ is a request for quotation, the package a buyer sends suppliers to get prices for a specific part. A complete RFQ includes a 3D model, 2D drawing, material, finish, annual volume, release quantities, and required certifications. Missing details lead to padded or non-comparable quotes.