Dimensional and assembly data for M14 Hex Bolts, Fine Pitch to ISO 8765. Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M14 Dimensional Row (ISO 8765)
| Size | Fine pitch (mm) | Width across flats s (mm) | Head height k (mm) | Stress area As (mmu00b2) | Common length range (mm) | Property class | Reference standard |
|---|---|---|---|---|---|---|---|
| M14 | 1.5 | 21.0 | 8.8 | 125.0 | 35~140 | 8.8 / 10.9 | ISO 8765 |
Spanner & Drive for M14 Hex Bolts, Fine Pitch
Drive geometry for M14 Hex Bolts, Fine Pitch is given by the row above; match the tool to the listed values.
Hole Sizes for M14
| Coarse-thread pitch (ISO 724) | 1.5 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 15.5 mm |
| Tapping drill, coarse thread | 12.5 mm |
Tightening Torque for M14
| Class 8.8 (dry, ~µ 0.125) | ≈ 145 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 213 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 249 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Proof Load & Strength for M14
| Tensile stress area As (ISO 724) | 125 mm² |
|---|---|
| Proof load, class 8.8 | 72 kN |
| Proof load, class 10.9 | 103 kN |
| Proof load, class 12.9 | 121 kN |
| Min. ultimate tensile load, class 8.8 | 100 kN |
Proof load = tensile stress area × the proof stress Sp of the class, per ISO 898-1 — Sp is a lower figure than the yield stress Rp0.2 and the two are not interchangeable. The stress area is computed from this size's own diameter and pitch, so a fine-pitch designation gives the fine-pitch figure. Design the joint so the working preload stays below the proof load of the class selected.
M14 Hex Bolts, Fine Pitch Weight
A steel M14 hex bolts, fine pitch at the listed 35,140 mm length weighs approximately 42,490 g each — about 42,490 kg per 1,000 pieces. Stainless A2/A4 weighs roughly the same (density 7.9–8.0 g/cm³).
Actual weight varies slightly with head form, thread and finish; use this figure for freight estimation only.
Mating Parts for M14
For M14, pair with a M14 hex nut (ISO 4032 / DIN 934) and, where used, a M14 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Custom manufacturing · Made to drawing
Need hex bolts, fine pitch in a size this table does not list?
This page covers M14 hex bolts, fine pitch. Thread size and pitch, length, property class, drive form, head geometry and head marking are all specifiable — the standard part is where it starts, not where it stops. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
