ENGINEERING TOOL
M10 Bolt Torque Chart: Specs, Values & Settings
Class 8.8 · Target preload (kN) 26
| Dry / Black | 52 N·m 47–57 |
| Electro Zinc | 44 N·m 39–52 |
| Hot-Dip Galv. | 57 N·m 47–65 |
| Oiled | 34 N·m 31–39 |
M10 bolt torque spec: class 8.8 dry is 52 N·m (38 ft·lb). Values cover six property classes across five friction states — dry, zinc, HDG, oiled and anti-seize. K-factor method, basis fully disclosed.
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Torque by Property Class and Friction State
Quick answer: class 8.8 · dry / black ≈ 52 N·m (47–57); other classes and friction states below.
| Class | Rp0.2 (MPa) | Target preload (kN) | Dry / Black K 0.18–0.22 · N·m | Electro Zinc K 0.15–0.2 · N·m | Hot-Dip Galv. K 0.18–0.25 · N·m | Oiled K 0.12–0.15 · N·m | Wax / PTFE / Anti-seize K 0.08–0.12 · N·m |
|---|---|---|---|---|---|---|---|
| 4.8 | 340 | 13.8 | 28 25–30 | 23 21–28 | 30 25–35 | 18 17–21 | 14 11–17 |
| 8.8 | 640 | 26 | 52 47–57 | 44 39–52 | 57 47–65 | 34 31–39 | 26 21–31 |
| 10.9 | 940 | 38.2 | 76 69–84 | 65 57–76 | 84 69–95 | 50 46–57 | 38 31–46 |
| 12.9 | 1100 | 44.7 | 89 80–98 | 76 67–89 | 98 80–112 | 58 54–67 | 45 36–54 |
| A2-70 | 450 | 18.3 | 37 33–40 | 31 27–37 | 40 33–46 | 24 22–27 | 18 15–22 |
| A4-80 | 600 | 24.4 | 49 44–54 | 41 37–49 | 54 44–61 | 32 29–37 | 24 19–29 |
Cell shows the typical value; the small line below is the range (min–max).
References
- ISO 898-1:2013 — Mechanical properties of fasteners made of carbon and alloy steel
- ISO 3506-1:2020 — Mechanical properties of corrosion-resistant stainless steel fasteners (A2/A4)
- GB/T 3098.1-2010 — Mechanical properties of bolts, screws and studs (CN national standard, official full text)
- GB/T 3098.6-2014 — Mechanical properties of stainless steel bolts, screws and studs (CN, official full text)
- ISO 16047:2005 — Fasteners: torque/clamp force testing (K-factor measurement method)
- Machinery's Handbook (30th ed.) — empirical K-factor ranges
- Machine Design — anti-seize compound friction test (K≈0.10)
Fine-Thread Torque Matrix
Fine-thread series (M10 × 1 mm) target preload and tightening torque ranges, same basis as the coarse chart; the fine-thread stress area As follows ISO 898-1:2013 Table 6 (this page takes M10 As = 64.5 mm²).
| Class | Rp0.2 (MPa) | Target preload (kN) | Dry / Black K 0.18–0.22 · N·m | Electro Zinc K 0.15–0.2 · N·m | Hot-Dip Galv. K 0.18–0.25 · N·m | Oiled K 0.12–0.15 · N·m | Wax / PTFE / Anti-seize K 0.08–0.12 · N·m |
|---|---|---|---|---|---|---|---|
| 4.8 | 340 | 15.4 | 31 28–34 | 26 23–31 | 34 28–38 | 20 18–23 | 15 12–18 |
| 8.8 | 640 | 28.9 | 58 52–64 | 49 43–58 | 64 52–72 | 38 35–43 | 29 23–35 |
| 10.9 | 940 | 42.4 | 85 76–93 | 72 64–85 | 93 76–106 | 55 51–64 | 42 34–51 |
| 12.9 | 1100 | 49.7 | 99 89–109 | 84 74–99 | 109 89–124 | 65 60–74 | 50 40–60 |
| A2-70 | 450 | 20.3 | 41 37–45 | 35 30–41 | 45 37–51 | 26 24–30 | 20 16–24 |
| A4-80 | 600 | 27.1 | 54 49–60 | 46 41–54 | 60 49–68 | 35 33–41 | 27 22–33 |
Cell shows the typical value; the small line below is the range (min–max).
Basis of Calculation & Sources
Calculation basis
- Torque follows the K-factor (nut factor) method T = K·D·F: D is the nominal diameter and F the target preload = 70% of Rp0.2 × thread stress area (M10 As = 58 mm²).
- Yield strengths are published values from ISO 898-1 (carbon/alloy steel) and ISO 3506-1 (stainless A2/A4).
- K follows published empirical ranges per friction condition (Machinery's Handbook; the wax/PTFE/anti-seize band K≈0.10 follows Machine Design test data).
- The grease/MoS₂ band (K≈0.11) nearly overlaps anti-seize and is available in the calculator instead of a separate column.
Stainless note: A2/A4 austenitic thread pairs gall easily under frictional heating. Always apply anti-seize and follow the Wax/PTFE/Anti-seize column (K≈0.10).
Scope & limits
- This chart is a simplified K-factor estimate, not a full VDI 2230 analysis (which accounts for joint resilience, embedment and assembly method).
- Friction is the dominant variable — no single torque value exists without its friction state.
- Always follow the design specification or manufacturer torque table.
Cite this chart
YAXIIO. M10 Bolt Torque Chart: Specs, Values & Settings. https://www.yaxiio.com/en/tools/bolt-torque-chart/m10 (accessed 2026-10-29).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
FAQ
What is the target preload for an M10 bolt?
At 70% of Rp0.2: class 4.8 ≈ 13.8 kN, 8.8 ≈ 26 kN, 10.9 ≈ 38.2 kN; stainless A2-70 ≈ 18.3 kN and A4-80 ≈ 24.4 kN.
Can I use carbon-steel torque values for stainless M10 (A2-70/A4-80)?
No. The classes have different yield strengths (A2-70 = 450 MPa, A4-80 = 600 MPa), so target preloads differ; and stainless thread pairs gall easily — always apply anti-seize and follow the Wax/PTFE/Anti-seize column (K≈0.10).
Next: work out your order, or pick the size by standard
Related References
Bolt Torque Calculator
Interactive version: fine threads, imperial, stud bolts, custom K and torque check — this size is pre-filled.
M10 Hex Bolt Weight Chart
Per-piece and per-1,000-pcs weights across the full length series of the same size.
M10 Hex Key Size Chart
Which hex key (Allen wrench) fits a socket head cap screw of the same size: socket width across flats, key long and short arm lengths, and unit weight on the GB/T 70.1 + GB/T 5356 basis.
Tap Drill for the Thread Being Tightened
The hole under the bolt: rule tap drill value plus the nearest drill bit in the set, stated ahead of the torque tables.
Disclaimer: This chart is an engineering estimation for selection and budgeting only. It does not constitute assembly instructions or acceptance criteria.