About

In hardware warehousing and assembly lines, counting thousands of nuts by hand is inefficient. Instead, inventory is managed by weight ("weigh-counting"). Knowing the precise individual weight of standard fasteners allows for rapid quantity estimation.

This tool calculates the number of nuts in a bulk batch based on standard weights from ISO 4032 (Metric) and ANSI B18.2.2 (Imperial). It also features a "Kit Logic" mode: if you have a known weight of bolts and need to check if you have a matching weight of nuts, this tool helps verify the ratios.

Formulas

The counting logic is a simple division of total mass by the unit mass.

Count = Mass_totalMass_unit

For the "Kit Calculator", the tool compares the count of nuts to an input count of bolts to determine the surplus or deficit.

Reference Data

Nut Size (Metric)	Weight per 1000 pcs (kg)	Weight per Nut (g)
M3	0.34	0.34
M4	0.81	0.81
M5	1.23	1.23
M6	2.50	2.50
M8	5.20	5.20
M10	11.60	11.60
M12	17.30	17.30
M16	33.30	33.30
M20	64.40	64.40
M24	109.00	109.00

Frequently Asked Questions

They are based on standards (DIN 934 / ISO 4032 for metric). However, manufacturing tolerances and plating (Zinc, Galvanized, Black Oxide) adds small variations. For batches under 100, exact counting is better. For thousands, this tool provides an estimate within ~2% accuracy.

No. Nylon insert lock nuts (Nyloc) are slightly heavier due to the added height and nylon ring. This tool is calibrated for standard finished hex nuts.

Enter your bulk nut weight first to get the nut count. Then, check the "Kit Mode" box and enter the number of bolts you have. The tool will tell you if you have enough nuts to pair one with every bolt.