Engineering geometry tool
ISO 4014/4017 Bolt Geometry & Mass Estimator
Distinguish partial and full thread, look up basic nominal head dimensions, and estimate mass from a documented idealized geometry and your material density.
Nominal geometry and estimate
Current product standards
ISO 4014:2022 covers partially threaded hexagon head bolts and ISO 4017:2022 covers fully threaded hexagon head screws, both in steel and stainless steel with metric coarse-pitch threads M1.6–M64 and product grades A/B. This page is a limited M6–M48 nominal lookup, not a reproduction of all tolerances, preferred lengths or conformity requirements.
ISO 4014 minimum thread-length rule
For the estimate, threaded length is min(b,L). ISO 4017 is modelled as threaded over L. Real products include runout and incomplete thread; verify availability and exact limits in the licensed standard or supplier drawing.
Transparent mass model
The head is an ideal regular hexagonal prism across flats s. The smooth part is a nominal-diameter cylinder. The threaded part is represented by the basic pitch-diameter cylinder from the ISO metric basic profile. This is an engineering estimate only: chamfers, bearing face, fillets, runout, tolerances, thread-root geometry and coating are omitted.
Basic nominal lookup used
| Размер | s (мм) | к (мм) | coarse P (mm) |
|---|---|---|---|
| М6 | 10 | 4.0 | 1.0 |
| М8 | 13 | 5.3 | 1.25 |
| М10 | 16 | 6.4 | 1.5 |
| М12 | 18 | 7.5 | 1.75 |
| М14 | 21 | 8.8 | 2.0 |
| М16 | 24 | 10.0 | 2.0 |
| М20 | 30 | 12.5 | 2.5 |
| М24 | 36 | 15.0 | 3.0 |
| М30 | 46 | 18.7 | 3.5 |
| М36 | 55 | 22.5 | 4.0 |
| М42 | 65 | 26.0 | 4.5 |
| М48 | 75 | 30.0 | 5.0 |
These are basic nominal display values. Widths/tolerances depend on the actual product standard and grade; DIN-pattern products must not be assumed identical. A current Fastenal ISO 4014 product specification independently confirms the ISO M10/M12 dimensions and tolerances, while Fabory ISO product records confirm the thread-length branches and show why catalogue mass depends on the exact product.
Източници
- Fastenal ISO 4014 product standard — M10/M12 dimensional limits.
- Fabory M10×160 ISO 4014 product record — b branches, s/k/P and catalogue mass.
- ISO 724:2023 и ISO 68-1:2023 — current metric-thread basic dimensions/profile context.
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