How it is calculated
Length is measured under the head, the way a bolt is usually marked. For an exact batch weight, use the table of the particular standard when you have one.
grams = 0,0062 × diameter² × length × pieces
Where the numbers come from
- Diameter — unit in the field: mm
- Length — unit in the field: mm
- Quantity — unit in the field: pcs
Example
By this estimate, an M8×30 bolt is heavier than a smooth rod of the same size.
Questions
Are nuts included?
No. Their mass is not added here.
Is an M8 diameter 8 mm?
Yes, enter 8.
Why an estimate?
Bolts differ in head and strength grade. One formula is not a size chart.