ENGINEERING TOOL
M8 Threaded Rod & Stud Bolt Weight Chart
Per-meter and per-piece weights of M8 fully threaded rod (same basis for all-thread, threaded bar and double-end stud bolts) across 100–3000 mm lengths (carbon steel, geometric-volume method), kg/m and lb/ft, with pitch, root diameter and tensile stress area — basis fully disclosed.
M8 threaded rod (carbon steel) weighs about 0.38 kg/m; a 1 m bar runs about 0.38 kg and a 3 m bar about 1.1 kg.
Other sizes
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Weight per meter (M8, kg/m)
| Weight per meter |
|---|
| 0.38 kg/m |
Thread Data
| Coarse pitch | 1.25 mm |
| External thread minor dia. | 6.47 mm |
| Tensile stress area As | 36.6 mm² |
Pitch and minor diameter are public ISO metric basic-profile geometry; As is the ISO 898-1 tensile stress area used for tensile capacity calculations, not the physical cross-section.
Weight per piece by length (M8, kg/pc)
| Length L (mm) | Weight per piece |
|---|---|
| M8×100 | 0.038 |
| M8×150 | 0.057 |
| M8×200 | 0.077 |
| M8×250 | 0.096 |
| M8×300 | 0.11 |
| M8×400 | 0.15 |
| M8×500 | 0.19 |
| M8×600 | 0.23 |
| M8×800 | 0.31 |
| M8×1000 | 0.38 |
| M8×1500 | 0.57 |
| M8×2000 | 0.77 |
| M8×2500 | 0.96 |
| M8×3000 | 1.1 |
Cell shows the piece weight at that length (kg/pc, carbon steel 7.85 g/cm³, fully threaded rolled rod at 97% of plain bar). Trade practice: 1/2/3 m standard bars or cut to length.
References
- GB/T 15389-1994 — Threaded rods (CN national standard, official full text)
- 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
Material Density Conversion
Values above are carbon steel (7.85 g/cm³); for other materials multiply by the density factor.
| Material | Density (g/cm³) | Factor |
|---|---|---|
| Carbon / Alloy Steel | 7.85 | ×1.000 |
| Stainless 304 | 7.93 | ×1.010 |
| Stainless 316 | 7.98 | ×1.017 |
| Brass | 8.5 | ×1.083 |
Basis of Calculation & Disclosed Assumptions
All values are computed as geometric volume × density (carbon steel 7.85 g/cm³, base metal, coating excluded) — no copyrighted standard tables are reproduced. Fully threaded rolled rod = plain cylinder π/4·d²·L × 0.97 (thread-rolling allowance, identical formula and parameters as the online weight calculator). The plain full-diameter figure is 0.395 kg/m; this chart uses 97% of it.
Boundary: theoretical geometric estimates for quotation, freight and lifting budgets. Actual piece weight varies with thread tolerance and coating (hot-dip galvanizing ≈ +4.5%). Use measured values for trade settlement. Double-end studs are cut-to-length products — at the same diameter and length the piece weight matches threaded rod.
Corresponding standard page
Open the GB/T 15389 standard product page: sizes, materials and finishes, and ordering questions.
Open the GB/T 15389 page
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Send M8 straight into the inquiry form, with material, quantity and drawing — we quote to the standard or to your drawing.
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FAQ
How much does M8 threaded rod weigh per meter?
On the carbon-steel basis (fully threaded rolled rod at 97% of plain bar) about 0.38 kg/m; a 1 m bar runs about 0.38 kg and a 3 m bar about 1.1 kg. The plain full-diameter figure is 0.395 kg/m.
How much does a M8×3000 threaded rod weigh?
About 1.1 kg per 3 m bar on the carbon-steel basis; a 2 m bar is about 0.77 kg and a 1 m bar about 0.38 kg — see the full 100–3000 mm table above. For stainless 304/316 multiply by the density factors ×1.010/×1.017.
Are threaded rod and stud bolt weights the same thing?
Yes. A double-end stud bolt is threaded rod (all-thread / threaded bar) cut to a fixed length, so at the same diameter and length the unit weight is identical — the kg/m row and the length table of this chart apply to both. The terms threaded rod, all-thread, threaded bar and stud bolt all denote this fully threaded product family.
What are the pitch, root diameter and tensile stress area of M8 threaded rod?
Coarse pitch 1.25 mm, external thread minor (root) diameter about 6.47 mm, and tensile stress area As = 36.6 mm² (ISO 898-1). As drives tensile capacity and preload calculations — pair it with the torque chart.
What basis are these weights calculated on?
Geometric volume × density (carbon steel 7.85 g/cm³, base metal, coating excluded), fully threaded rolled rod at 97% of the plain cylinder — the same formulas and parameters as the online weight calculator; the plain full-diameter figure 0.395 kg/m is shown for reconciliation only. Theoretical estimates — use measured values for trade settlement.
Related References
Bolt Weight Calculator
Interactive version: threaded rod / stud bolt at any length with nut & washer sets, material and coating factors — this size is pre-filled.
M8 Bolt Torque Chart
Same-size torque range and preload matrix by class × friction state, Nm↔ft-lb toggle — stud tightening reference.
M8 Hex Bolt Weight Chart
Per-piece and per-1,000-pcs weights for the same size, including matching nut and washer.
Double-End Stud Catalog
GB/T 901 and more: studs for pressure vessels and flange connections — custom sizes quoted to drawing.
Industrial Pipe Flange Fasteners
Stud bolts for PN flange connections: selection guide with matching studs and gaskets.
Disclaimer: This chart is an engineering estimation for selection, quotation and freight estimation only. It does not constitute design or acceptance criteria.