ENGINEERING TOOL
Bolt Weight Calculator (Metric, in kg)
Unit weight, order total weight and freight estimate for bolts, nuts, washers and threaded rod, built for quoting and logistics
Unit Weight
54.5g
(range 51.8–57.2 g)
Order Total Weight (est.)
54.452kg
120 lb
Pieces per Tonne (approx.)
18,365
Packing Estimate
3cartons
⚠ Estimate (±5%), not factory-measured; for quoting and freight budgeting
Estimated at 25 kg net per carton (common industry carton; actual packing varies by supplier)
Freight Estimate
Estimated Freight
$ 8USD
Indicative default rates only. Actual rates vary by lane, season and forwarder, always confirm with your forwarder.
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Weight Chart, Hex BoltM12
Weight per 1,000 pcs across the full length series at the selected material (linked to quantity above). Current selection highlighted. Plain HTML, free to reference.
View the full M12 weight chart (per piece & per 1,000 pcs) →
| Length | Weight per 1,000 pcs |
|---|---|
| 10 mm | 22.143 kg |
| 12 mm | 23.599 kg |
| 16 mm | 26.509 kg |
| 20 mm | 29.419 kg |
| 25 mm | 33.057 kg |
| 30 mm | 36.695 kg |
| 35 mm | 41.134 kg |
| 40 mm | 45.573 kg |
| 45 mm | 50.012 kg |
| 50 mm | 54.452 kg |
| 60 mm | 63.33 kg |
| 70 mm | 72.208 kg |
| 80 mm | 81.086 kg |
| 90 mm | 89.964 kg |
| 100 mm | 98.842 kg |
| 110 mm | 107.72 kg |
| 120 mm | 116.599 kg |
| 140 mm | 133.393 kg |
| 160 mm | 151.15 kg |
| 180 mm | 168.906 kg |
| 200 mm | 186.662 kg |
| 250 mm | 228.97 kg |
| 300 mm | 273.361 kg |
Method & Data Sources
Geometric volume × material density — same formulas and tables as the product catalog.
① Bolts / Screws / Anchors
| Type | Formula | Dimension source |
|---|---|---|
| Hex bolt | Shank (full: d2 / partial: grip + thread at d2) + hex head × 0.9 | DIN 933/931 · GB/T 5782/5783 |
| Self-drilling (TS) | Full thread at d2 + drill point + head (hex flange / pan) | GB/T 15856.4 / 15856.1 |
| U-bolt (UB) | Developed = 2×leg + π×(inner width + d)/2 | DIN 3570 inner-width/leg table |
| Anchor bolt (AB) | Straight shank + hook (6d) | GB/T 799 |
| Chemical / Expansion anchor | Full thread at d2 (expansion: + cone tip) | GB/T 22795 |
| Threaded rod / Stud | Pitch-diameter cylinder π/4·d2²·L (d2 = d − 0.6495 × pitch P) | DIN 975 / GB/T 15389 / GB/T 901 |
② Nuts / Washers
| Type | Formula | Dimension source |
|---|---|---|
| Hex nut | Hex prism − thread hole (effective d − 0.5×pitch) | ISO 4032 · GB/T 6170 |
| Flange nut (FN) | Hex prism + flange disc (×0.5) − hole | GB/T 6177.1 |
| Coupling nut (CN) | Elongated hex prism (3d) − hole | DIN 6334 |
| Flat / spring washer | Annular disc (flat washer bore at DIN 125 A standard hole d1: π/4·(D²−d1²)·t; spring π/4·(D²−d²)·t ×0.83 split allowance) | DIN 125/127 · GB/T 97.1/93 |
③ Flanges / Gaskets (same values as catalog)
- Weld neck & plate flanges (GB/T 9124.1-2019, EN 1092-1 Type 11 / Type 01): catalog table weights, non-CS scaled by density / 7.85
- Non-metallic flat gaskets (GB/T 9126.1-2023): ring area × thickness × density, standard 2.0 mm
- Spiral wound (GB/T 4622.1-2022): winding 3.3 + 304 inner ring 7.93 + CS outer ring 7.85 (g/cm³)
④ Material Density (g/cm³)
⑤ Accuracy & Deviation
- Results rounded under the display-layer convention: 2 decimals below 1 g, 3 significant figures at 1 g and above, to mark the estimate nature
- Geometric estimate tolerance: ±2% for flat washers (bore calibrated to the DIN 125 A standard hole diameter d1); ±5% for other standard parts; ±10% for carriage bolts, spring washers, self-drilling screws, anchors and spiral-wound gaskets; the high-strength assembly table-value ranges are standard theoretical mass table values. Surface finish added as % of base weight: zinc plated +0.5%, HDG +4.5% (GB/T 13912, 55–85µm), Dacromet +0.5%, black oxide +0.3% (catalog weights are base metal, coating excluded)
- Imperial dimensions are ASME B18.2.1 proportional approximations, not lookup-table values
- Use supplier-measured weights for settlement; freight figures are indicative only
⑥ High-strength structural assemblies (GB/T 1231 / 3632 / 32076.7)
- Heavy hex assembly (GB/T 1231-2024, M12–M36) = table masses for bolt + nut + washer A + washer B, one of each (Tables 3–6 added directly); M39–M64 = geometric estimate from GB/T 32076.7-2015 dimensions (bolt + nut + 1 washer).
- TC assembly (GB/T 3632-2008, M16–M30) = table masses for bolt + nut + washer, one of each (Tables 3–5 added directly).
Cite this chart
YAXIIO. Bolt Weight Calculator (Metric, in kg). https://www.yaxiio.com/en/tools/bolt-weight-calculator (accessed 2026-10-28).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
FAQ
How close is the estimate to actual weight?
For standard parts the deviation is typically within ±5%, driven by tolerances, head geometry and coating. Sufficient for freight and quotation estimates; use measured values for trade settlement.
How much weight does coating add?
Hot-dip galvanizing typically adds 3–6% depending on coating thickness; electro zinc adds under 1%. This tool computes base-material weight.
Which density should I use for special alloys?
A2/A4 (304/316) fasteners are close to 7.9 g/cm³; duplex 2205 is about 7.8 g/cm³. For exotic alloys, choose "Custom density" and enter the actual value.
What basis is used for stud-bolt weight?
Flange-assembly convention: stud bolt + 2 hex nuts of the same size (ASME B16.5 joint basis — same as piping-world/projectmaterials per-100 tables with two nuts). Heavy hex nuts (e.g. A194 2H) run 10–15% heavier than regular nuts; for a heavy-hex basis please quote against the actual catalog nut spec or contact us.
How does carriage-bolt weight compare with hex?
At the same size and length the comparison depends on the rod-diameter basis: GB/T 12 specifies the unthreaded shank at approximately the major diameter, so on the catalog basis a carriage bolt runs a bit heavier than a hex bolt (e.g. M12×50: carriage ≈ 68 g vs hex ≈ 54 g); on a pitch-diameter basis they are close or slightly lighter. Always settle against the actual catalog SKU weight.
Related References
M12 Hex Bolt Weight Chart
kg per piece and per 1,000 pcs by length; full M6–M36 size navigation on page.
M16 Hex Bolt Weight Chart
Includes matching nut and washer unit weights; full size navigation on page.
M12 Anchor Bolt Weight Chart
Unit weight for straight / J-hook / L-bend / end-plate configs by length; full size navigation on page.
Hex Nut Weight Chart (M6–M36)
The full hex nut size range in one table: unit weight and kg per 1,000 pcs per size, each size linked to its own page.
Disclaimer: This is an engineering estimation tool. Results are provided for selection, quotation and freight estimation only and do not constitute design or acceptance criteria.