The M14 size of Plow Bolts (Countersunk, Square Neck) is dimensioned by ASME B18.9. The table below gives the dimensional row from the standard, followed by the installation notes for this type.
Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.
M14 Dimensional Row (ASME B18.9)
| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Countersink angle | Square neck width (mm) | Common length range (mm) | Reference standard |
|---|---|---|---|---|---|---|---|
| M14 | 2.0 | 35.0 | 8.7 | 80 | 14.5 | 35~110 | ASME B18.9 |
Tightening Torque for M14
| Class 8.8 (dry, ~µ 0.125) | ≈ 134 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 197 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 231 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) | 115 mm² |
|---|---|
| Proof load, class 8.8 | 67 kN |
| Proof load, class 10.9 | 96 kN |
| Proof load, class 12.9 | 112 kN |
| Min. ultimate tensile load, class 8.8 | 92 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.
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 plow bolts (countersunk, square neck) in a size this table does not list?
This page covers M14 plow bolts (countersunk, square neck). Dimensions, material, finish and form are specified from the drawing — a bolt outside the standard range is a variation on existing tooling rather than a new design. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
