JB/T 51120-1999

Product quality grading of engine crankshaft

Standard Type

JBT

ICS

27.020

CCS

J92

Status

N/A

Issue Date

1999-12-30

Implementation

2000-06-01

Centralized Committee

National Internal Combustion Engine Committee

Issuing Authority

State Bureau of Machinery Industry

Catalogue

Scope, References, Dimension, Balance, Fatigue

Scope

Crankshaft production, processing inspection, matching grading

Applicable to small & medium engine crankshaft

Normative References

GB/T 2828.1-2012

Keywords

Crankshaft dynamic balance fatigue strength geometric tolerance

Application Summary AI generated

1. Graded by dynamic balance precision and geometric tolerance

2. Controls fatigue strength and surface hardness

3. Standardizes flaw detection and balance test

4. Unified sampling rules.

Standard Timeline

replaces JB/T 51120.1

replaces 51120.3-94

Related Standards

JB/T 6728.2-2008 Internal combustion engines - Camshafts - Part 2: Wedge-cross rolling blanks JB/T 51185-1999 Volute Mixed-Flow Pump - Product Quality Grading (Internal Use) JB/T 51116-1999 Internal combustion engines - Oil pumps - Product quality grading (Internal use) JB/T 51115-1999 Diesel engines - Hydraulic speed governors - Product quality grading (Internal use) JB/T 51111-1999 Internal combustion engines - Paper element oil filter assemblies - Product quality grading (Internal use) JB/T 51117-1999 Internal Combustion Engines - Valve Seat - Product Quality Grading (Internal Use) JB/T 51119-1999 Internal combustion engines - Valve tappets - Product quality grading (Internal use) JB/T 51114-1999 Internal combustion engines - Cooling water pumps - Product quality grading (Internal use)

Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.