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What is Tumbling?

Tumbling is a finishing process that is used to clean, deburr, and slightly smooth smaller parts. Tumbling uses a horizontal drum where parts are placed, along with a media, such as sand or ceramic chips. The drum rotates slowly, Tumbling itself offers zero corrosion resistance. It is often used as pre‑treatment step before anodizing, plating or passivation. Common output surface ranges from soft matte to semi‑bright finish, widely used for fasteners, hardware, small mechanical components.

Description

Applications

All post processes, except Electropolish and Powder Coat

Applicable materials

Aluminum, Steel, Stainless Steel, Brass, Bronze, Copper

Color/Specification

n/a

Tumbling Standards

ASTM B248；MIL‑A‑8625F: no

Benefits of Tumbling

High surface finish
Removes surface defects
Improves part accuracy
Suitable for small parts
Low cost
Batch processing capability
Increases surface hardness (sometimes)
Improves part fit
Time-consuming
Commonly used in wet processing

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