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As-machined (standard) surface finish refers to the raw condition of a part immediately after machining, without any additional surface treatments like polishing, grinding, or coating. This finish is characterized by visible tool marks resulting from the cutting process, influenced by tool geometry, feed rate, and spindle speed. Surface roughness typically ranges from 1.6 to 3.2 µm Ra, depending on the material, machine tool, and operator expertise. While the appearance is not smooth or polished, the surface maintains high dimensional accuracy. Minor burrs or sharp edges may be present but can be addressed if necessary. This finish is highly cost-effective as it eliminates secondary processing. It is ideal for functional parts where precision is more important than aesthetics. As-machined surfaces are commonly used in prototyping, mechanical components, and engineering applications. They offer a practical balance between manufacturing efficiency, tolerance control, and production cost.
All metals like (aluminum, stainless steel etc.), and some plastics.
Typically 3.2 µm Ra (125 µin) with visible tool marks.
Raw, matte with visible machining lines.
Not cosmetic; no finishing or smoothing applied.
No change in material thickness; true to machined dimensions.
Tool-defined, slightly rough with linear or circular patterns.
6061 T6, 6082, 7075-T6, 5083-H111, 6063, 5052, 2024-T351, 7050, 2017A, 6082-T651, 7075-T651, 2014, 6061-T651, 7075-T7351, 6082-T6, 2014-T6, 6063-T5, 6063-T6, 5083-H32, 5052-H32
A2 Tool steel, D2 Tool steel, A3 Tool Steel, O1 Tool Steel, S7 Tool Steel, H13 Tool Steel
932 Bearing Bronze , 954 Bearing Bronze, 544 Bearing Bronze
A standard "As Machined" surface usually has a roughness average (Ra) of 3.2 μm (125 µin), though this can vary slightly depending on the tool, material, and machine.
Not always. While it's acceptable for many functional parts, especially internal components, high-end or customer-facing parts often require additional finishing.
Yes, though the rougher surface can affect features like sealing surfaces. Tight tolerances are achievable, but surfaces may still require smoothing for optimal function.