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Fastener
Weight Chart
& Calculator
Find the exact weight per piece and per lot for any bolt, nut, stud bolt, washer or threaded rod. Select your size, material and quantity — result updates instantly.
Reference Data
* Per piece, including head · SS 304/316
* Per piece · Heavy hex · SS 304/316
* Fully threaded stud bolt · Per piece · A193 B7 / SS 316
* Per piece · DIN 125 plain washer · SS 304/316
* Per metre · Fully threaded · SS 304/316
Standard Weight Tables
Weights are for SS 304/316 (density 7.93 g/cm³). Use the density multiplier at the bottom for other materials.
| Size | 50mm | 75mm | 100mm | 150mm | 200mm | 250mm | 300mm |
|---|
| Size | Hex Nut | Heavy Hex Nut | Lock Nut | Nylock Nut | Flange Nut | Coupling Nut |
|---|
| Size | 100mm | 150mm | 200mm | 250mm | 300mm | 350mm | 400mm |
|---|
| Size | Plain Washer | Spring Washer | Lock Washer | Structural (F436) | Ogee Washer |
|---|
| Size | Outer Dia (mm) | Root Dia (mm) | kg / metre | kg / 3m bar | kg / 6m bar |
|---|
Adjusting for other materials
Multiply any table value by: New density ÷ 7.93. Example for Inconel 625 (8.44): multiply by 8.44 ÷ 7.93 = 1.064
Density Reference
Material Density Values
Use these densities with the calculator or as multipliers on the reference tables above.
SS
Stainless Steel 304/316
7.93
g/cm³
Most common fastener material. Marine, food, chemical.
CS
Carbon / Alloy Steel
7.85
g/cm³
A193 B7, Grade 8.8, 10.9, 12.9. Structural & pressure service.
Mo
Monel 400 / K500
8.44
g/cm³
Nickel-copper alloy. Marine, HF acid, desalination service.
In
Inconel 625 / 718
8.44
g/cm³
Nickel superalloy. Gas turbines, nuclear, subsea wellheads.
Ha
Hastelloy C276
8.89
g/cm³
Extreme chemical resistance. HCl, H₂SO₄, wet chlorine.
Dx
Duplex / Super Duplex
7.80
g/cm³
Offshore, chloride environments. F51 / F53 / F55 grades.
Br
Brass (C36000)
8.53
g/cm³
Copper-zinc alloy. Electrical, plumbing, instrumentation.
Ti
Titanium Grade 2
4.51
g/cm³
Lightest structural metal. Aerospace, marine, medical.
How It’s Calculated
The Weight Formula
Standard volumetric formula used by fastener manufacturers and engineers worldwide.
Hex Bolt Weight Formula
// Volume of cylindrical shank
V_shank = π/4 × d² × L
// Volume of hex head (approx.)
V_head = 0.866 × s² × k
// Total weight
W = (V_shank + V_head) × ρ
V_shank = π/4 × d² × L
// Volume of hex head (approx.)
V_head = 0.866 × s² × k
// Total weight
W = (V_shank + V_head) × ρ
dNominal diameter in cm (M16 → d = 1.6 cm)
LLength under head in cm
sAcross-flats (AF) width in cm per DIN 934
kHead height in cm per ISO 4014
ρMaterial density in g/cm³ (SS 316 = 7.93)
1
Get nominal diameter — e.g. M20 → d = 20mm = 2.0cm. For root area use effective tensile stress area.
2
Look up AF and head height from ISO 4014 (hex bolts) or ASME B18.2.1. Standard values used in all our tables.
3
Calculate shank volume — π/4 × d² × length. For threaded rods use effective thread root diameter for accuracy.
4
Add head volume — hex head approximated as a regular prism: 0.866 × AF² × head height.
5
Multiply total volume by density — result in grams. Divide by 1000 for kg. Multiply by quantity for lot weight.
6
For other materials — multiply SS result by ρ_material / 7.93. All densities in the reference table above.
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