M36 is one of the standard coarse-thread sizes for swing bolt under GB/T 77 / ISO 4026. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M36 Dimensional Row (GB/T 77 / ISO 4026)
| Thread size | Pitch (mm) | Ring outer dia D (mm) | Ring wire dia (mm) | Total length L (mm) | SWL (kg, axial) | Reference standard |
|---|---|---|---|---|---|---|
| M36 | 4.0 | 72 | 30 | 126 | 5000 | DIN 580 / GB/T 825 |
Spanner & Drive for M36 Swing Bolt — GB/T 77 / ISO 4026 (Series 020)
Drive geometry for M36 Swing Bolt — GB/T 77 / ISO 4026 (Series 020) is given by the row above; match the tool to the listed values.
Hole Sizes for M36
| Coarse-thread pitch (ISO 724) | 4 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 39 mm |
| Tapping drill, coarse thread | 32 mm |
Tightening Torque for M36
| Class 8.8 (dry, ~µ 0.125) | ≈ 2450 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 3450 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 4150 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 M36
| Tensile stress area As (ISO 898-1) | 817 mm² |
|---|---|
| Proof load, class 8.8 | 490 kN |
| Proof load, class 10.9 | 678 kN |
| Proof load, class 12.9 | 792 kN |
| Min. ultimate tensile, class 8.8 | 654 kN |
Proof load = stress area × proof stress per ISO 898-1. Design joints so the working preload stays below the proof load of the selected class.
M36 Swing Bolt — GB/T 77 / ISO 4026 (Series 020) Weight
A steel M36 swing bolt at the listed 126 mm length weighs approximately 1,007 g each — about 1,007 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.
Common Applications for M36 Swing Bolt — GB/T 77 / ISO 4026 (Series 020)
M36 Swing Bolt — GB/T 77 / ISO 4026 (Series 020) are commonly specified for structural steelwork, heavy machinery foundations and large flange joints.
Installation Tips for M36 Swing Bolt — GB/T 77 / ISO 4026 (Series 020)
- At M36 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M36
For M36, pair with a M36 hex nut (ISO 4032 / DIN 934) and, where used, a M36 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.