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An Introduction to Micrometer Precision

The micrometer is a widely used precision measuring tool. Based on its manufacturing accuracy, it can be classified into two grades: Grade 0 and Grade 1, with Grade 0 offering higher precision and Grade 1 being slightly lower. The manufacturing precision of a micrometer is primarily determined by ...

2025-09-22

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Selection of Measuring Tools for Surveying Parts

For assembly (fit) dimensions (such as bearing seats or flange end cover spigots), a micrometer must be used for measurement, and the results should be recorded with two decimal places. For other non-fit dimensions (such as external dimensions), calipers or steel rulers may be used for measurement, ...

2025-09-22

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Keyway Surface Roughness

1. Keyway Width Sides (Flanks): Ra = 3.2 μm Rationale: This precision grade ensures that the key and the keyway sides can be assembled smoothly and have a sufficiently large actual contact area for transmitting torque. This effectively prevents stress concentration, fretting wear, and the initiation ...

2025-09-22

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Technical Requirements Guide for Keyways

This standard specifies the technical requirements for the design tolerances of keyway width, symmetry, and the keyway root fillet on shafts and hubs.This standard is applicable to the design of keyways on both shafts and hubs.The technical requirements for the keyway root fillet specified in this ...

2025-09-22

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