ENGINEERING TOOL
M20 Hex Bolt Weight Chart (in kg)
Weight Chart
| Length (mm) | Weight per piece (g) | Weight per 1,000 pcs (kg) |
|---|---|---|
| M20×40 | 152 | 152 |
| M20×45 | 163 | 163 |
| M20×50 | 174 | 174 |
| M20×60 | 199 | 199 |
| M20×70 | 224 | 224 |
Full metric length series for M20 hex bolts — weight per piece (g) and per 1,000 pcs (kg), carbon steel, ISO 4014 / GB/T 5782-2025 partially threaded basis.
Full PDF
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Other sizes
Weight Chart
| Length (mm) | Weight per piece (g) | Weight per 1,000 pcs (kg) |
|---|---|---|
| M20×10 | 89.7 | 89.7 |
| M20×12 | 93.8 | 93.8 |
| M20×16 | 102 | 102 |
| M20×20 | 110 | 110 |
| M20×25 | 121 | 121 |
| M20×30 | 131 | 131 |
| M20×35 | 142 | 142 |
| M20×40 | 152 | 152 |
| M20×45 | 163 | 163 |
| M20×50 | 174 | 174 |
| M20×60 | 199 | 199 |
| M20×70 | 224 | 224 |
| M20×80 | 248 | 248 |
| M20×90 | 273 | 273 |
| M20×100 | 298 | 298 |
| M20×110 | 322 | 322 |
| M20×120 | 347 | 347 |
| M20×140 | 394 | 394 |
| M20×160 | 443 | 443 |
| M20×180 | 493 | 493 |
| M20×200 | 542 | 542 |
| M20×250 | 660 | 660 |
| M20×300 | 784 | 784 |
References
- GB/T 5782-2016 — Hex head bolts (CN national standard, official full text; aligns with ISO 4014 series)
- Hex head bolt dimensions (ISO 4014 series)
- GB/T 192-2003 — General purpose metric screw threads: basic profile (CN, official full text; ISO 68-1 equivalent)
- Metric thread basic profile (ISO 68-1)
- Dimensions cross-checked against industry fastener data libraries; densities are common industry values
Basis of Calculation
Carbon steel (density 7.85 g/cm³), GB/T 5782 partially threaded, coarse pitch, base-metal weight (coating excluded). Typical deviation within ±5% for standard parts; stainless 304/316 scale by density 7.93/7.98 (≈ +1.0%/+1.7%). Use measured values for trade settlement.
Matching Nut & Washer Weights
| Hex nut (ISO 4032 / GB/T 6170) M20 | 63.2 g per piece |
| Flat washer (ISO 7089 / GB/T 97.1) M20 | 17.2 g per piece |
Cite this chart
YAXIIO. M20 Hex Bolt Weight Chart (in kg). https://www.yaxiio.com/en/tools/bolt-weight-chart/m20 (accessed 2026-10-29).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
FAQ
What nut fits an M20 bolt, and how much does it weigh?
A matching M20 hex nut (ISO 4032 / GB/T 6170) at about 63.2 g per piece; a flat washer (ISO 7089 / GB/T 97.1) runs about 17.2 g per piece.
How much heavier is an M20 bolt in 304/316 stainless, and how much does coating add?
Geometry is unchanged — only the density ratio applies: about ×1.010 for 304 and ×1.017 for 316. Coating is extra: hot-dip galvanizing typically adds 3–6%, electro zinc under 1%; chart weights are base metal without coating.
Next: work out your order, or pick the size by standard
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Total weight · Packing quantity · Freight estimate
Corresponding standard
DIN 933 / GB/T 5783-2025 / ISO 4017
Full size range · Per-size weight · How to choose material and grade — all on this standard page
Chart basis: GB/T 5782-2025 (partially threaded); this standard page covers GB/T 5783-2025 (fully threaded).
Related References
Bolt Torque Calculator
Tightening torque range and target preload by class and friction condition (K-factor method).
M20 Bolt Torque Chart
Same-size torque range and preload matrix by class × friction state, Nm↔ft-lb toggle, printable.
M20 Anchor Bolt Weight Chart
Same-size unit weight for straight / J-hook / L-bend / end-plate configurations by length.
Non-Standard Size? Estimate It with a CNC Quote
The sizes on this page follow the standard series. If a drawing calls for an intermediate diameter, a modified head, or a specified material grade, our CNC quote calculator prices blank weight, machining time and finishing line by line.
Disclaimer: This chart is an engineering estimation. Values are provided for selection, quotation and freight estimation only and do not constitute design or acceptance criteria.