GB/T 4458.4-2003Mechanical drawings--Dimensioning (English PDF)

National Standard of the People's Republic of China

ICS

01.100.99

Classification

J 04

Replacing

GB/T 4458.4-1984

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Contents

• Foreword i
• 1 Scope
• 2 Normative references
• 3 Basic rules
• 4 Dimension boundary line, dimension line and dimension value
• 5 Dimensioning symbols and abbreviations
• 6 Simplified dimensioning
• 7 Dimensioning for edges of undefined shape
• Annex A (Normative) Dimensioning symbols and abbreviations
• Figure 1 Drawing of dimension boundary line
• Figure 2 Dimensioning of curve contour (I)
• Figure 3 Dimensioning of curve contour (II)
• Figure 4 Dimensioning for oblique intersection between dimension boundary line and dimension line
• Figure 5 Drawing of dimension boundary line for indicating angle
• Figure 6 Drawing of dimension boundary line for indicating chord length
• Figure 7 Dimensioning for arc length
• Figure 8 Dimensioning for arc length (with relatively large radian)
• Figure 9 Arrow as terminal of dimension line
• Figure 10 Oblique line as terminal of dimension line
• Figure 11 Dimensioning when terminal of dimension line is in the form of an oblique line
• Figure 12 Dimensioning for diameter of circle and radius of arc
• Figure 13 Dimensioning when radius of arc is relatively large
• Figure 14 Dimensioning when only one arrow is drawn on the dimension line of a symmetrical part (I)
• Figure 15 Dimensioning when only one arrow is drawn on the dimension line of a symmetrical part (II)
• Figure 16 Dimensioning at limited places
• Figure 17 Indication positions for dimension values
• Figure 18 Indication direction of dimension value
• Figure 19 Indication of dimension value within the range of 30° tilt to the left
• Figure 20 Indication of dimension value not in horizontal direction (I)
• Figure 21 Indication of dimension value in horizontal direction (II)
• Figure 22 Indication positions for angle values (I)
• Figure 23 Indication positions for angle values (II)
• Figure 24 Indication of dimension value not separated by any line
• Figure 25 Dimensioning for sphere (I)
• Figure 26 Dimensioning for sphere (II)
• Figure 27 Dimensioning for reference dimension
• Figure 28 Dimensioning for square structure
• Figure 29 Simplified dimensioning for thickness of plate parts
• Figure 30 Dimensioning when there are special requirements for radius
• Figure 31 Dimensioning for 45° chamfers
• Figure 32 Dimensioning for chamfers of not 45°
• Figure A.1 Scale representation of symbols for dimensioning
• Table 1 Dimensioning examples of slope and taper
• Table A.1 Dimensioning symbols and abbreviations