M20 Nylon Insert Hex Lock Nut (Type 2) (GB/T 6182 / ISO 10513) are specified by thread size, length and head dimensions. The M20 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M20 Dimensional Row (GB/T 6182 / ISO 10513)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Total height m (mm) | Reference standard |
|---|---|---|---|---|---|
| M20 | 2.5 | 30.0 | 33.53 | 20.0 | ISO 7040 / DIN 985 |
Spanner & Drive for M20 Nylon Insert Hex Lock Nut (Type 2) — GB/T 6182 / ISO 10513 (Series 051)
Drive geometry for M20 Nylon Insert Hex Lock Nut (Type 2) — GB/T 6182 / ISO 10513 (Series 051) is given by the row above; match the tool to the listed values.
Common Applications for M20 Nylon Insert Hex Lock Nut (Type 2) — GB/T 6182 / ISO 10513 (Series 051)
M20 Nylon Insert Hex Lock Nut (Type 2) — GB/T 6182 / ISO 10513 (Series 051) are commonly specified for structural joints, flange connections and heavy equipment foundations.
Mating Parts for M20
Pair M20 with the matching M20 bolt or screw, plus a M20 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M20
When the joint preload approaches the proof load of M20 class 8.8, step up to M24 class 8.8 (or move to M20 class 10.9). When the joint is over-specified, M16 often saves weight and cost without losing the safety margin.