ENGINEERING TOOL
M12 Hex Bolt Weight Chart (in kg)
Full metric length series for M12 hex bolts — weight per piece (g) and per 1,000 pcs (kg), carbon steel, GB/T 5782 partially threaded basis.
M12×50 ≈ 54 g/pc (54 kg / 1,000 pcs)
Other sizes
Full PDF
Download the full PDF (M6–M36, all sizes)
Printable chart covering every size in this family — click to download the PDF directly.
Weight Chart
| Length (mm) | Weight per piece (g) | Weight per 1,000 pcs (kg) |
|---|---|---|
| M12×10 | 22 | 22 |
| M12×12 | 24 | 24 |
| M12×16 | 27 | 27 |
| M12×20 | 29 | 29 |
| M12×25 | 33 | 33 |
| M12×30 | 37 | 37 |
| M12×35 | 41 | 41 |
| M12×40 | 46 | 46 |
| M12×45 | 50 | 50 |
| M12×50 | 54 | 54 |
| M12×60 | 63 | 63 |
| M12×70 | 72 | 72 |
| M12×80 | 81 | 81 |
| M12×90 | 90 | 90 |
| M12×100 | 99 | 99 |
| M12×110 | 110 | 110 |
| M12×120 | 120 | 120 |
| M12×140 | 130 | 130 |
| M12×160 | 150 | 150 |
| M12×180 | 170 | 170 |
| M12×200 | 190 | 190 |
| M12×250 | 230 | 230 |
| M12×300 | 280 | 280 |
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
Matching Nut & Washer Weights
| Hex nut (GB/T 6170) M12 | 14 g per piece |
| Flat washer (GB/T 97.1) M12 | 7 g per piece |
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.
FAQ
How much does an M12×50 hex bolt weigh?
About 54 g per piece on the carbon-steel basis (GB/T 5782, partially threaded) — roughly 54 kg per 1,000 pcs.
How much does an M12×100 hex bolt weigh?
About 99 g per piece on the carbon-steel basis (GB/T 5782, partially threaded) — roughly 99 kg per 1,000 pcs.
What nut fits an M12 bolt, and how much does it weigh?
A matching M12 hex nut (GB/T 6170) at about 14 g per piece; a flat washer (GB/T 97.1) runs about 7 g per piece.
What basis are these weights calculated on?
Carbon steel (7.85 g/cm³), GB/T 5782 partially threaded, coarse pitch, base-metal weight (coating excluded). Geometric volume × density — same formulas and parameters as our catalog SKU weights; typical deviation within ±5% for standard parts.
Related References
Bolt Torque Calculator
Tightening torque range and target preload by class and friction condition (K-factor method).
Metric Bolt Torque Chart (Reference)
Full M6–M36 torque and preload tables with disclosed formula and clause citations.
M12 Bolt Torque Chart
Same-size torque range and preload matrix by class × friction state, Nm↔ft-lb toggle, printable.
M12 Anchor Bolt Weight Chart
Same-size unit weight for straight / J-hook / L-bend / end-plate configurations by length.
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.