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
▸ Length = leg length (DIN 3570 table)：内宽 136 mm / 高度 171 mm
Unit Weight
340g
Order Total Weight
340kg
750 lb
Pieces per Tonne (approx.)
2,941
Packing Estimate
14cartons
⚠ Estimate only, not an inspection weight. For quotation and freight estimation.
Estimated at 25 kg net per carton (common industry carton; actual packing varies by supplier)
Freight Estimate
Estimated Freight
$ 51USD
Indicative default rates only. Actual rates vary by lane, season and forwarder, always confirm with your forwarder.
Weight Chart, U-Bolt (UB)M12
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.
| Length | Weight per 1,000 pcs |
|---|---|
| 10 mm | 340 kg |
| 12 mm | 340 kg |
| 16 mm | 340 kg |
| 20 mm | 340 kg |
| 25 mm | 340 kg |
| 30 mm | 340 kg |
| 35 mm | 340 kg |
| 40 mm | 340 kg |
| 45 mm | 340 kg |
| 50 mm | 340 kg |
| 60 mm | 340 kg |
| 70 mm | 340 kg |
| 80 mm | 340 kg |
| 90 mm | 340 kg |
| 100 mm | 340 kg |
| 110 mm | 340 kg |
| 120 mm | 340 kg |
| 140 mm | 340 kg |
| 160 mm | 340 kg |
| 180 mm | 340 kg |
| 200 mm | 340 kg |
| 250 mm | 340 kg |
| 300 mm | 340 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 | Full cylinder × 0.97 (thread allowance) | 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 (π/4·(D²−d²)·t; spring ×0.83 split allowance) | DIN 125/127 · GB/T 97.1/93 |
③ Flanges / Gaskets (same values as catalog)
- Weld neck (GB/T 9115, EN 1092-1 Type 11) & plate flanges (GB/T 9119, Type 01): catalog table weights, non-CS scaled by density / 7.85
- Non-metallic flat gaskets (GB/T 9126): ring area × thickness × density, standard 2.0 mm
- Spiral wound (GB/T 4622): 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 by magnitude (10 g step below 1 kg, 100 g above)
- Typically within ±5% for standard parts. 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
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 does an M20×100 hex bolt weigh?
On the carbon-steel basis (GB/T 5782, partially threaded) an M20×100 hex bolt runs about 300 g per piece, i.e. roughly 30 kg per 100 pcs. See the weight chart below for the full M20 length series, or switch diameter (M6–M36) and length above for any other size.
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.
Can I embed this calculator?
Yes, an embeddable iframe version is planned. Contact us for the embed code; attribution "Powered by Yaxiio" appreciated.
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.
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.