Slotted Round Nut — GB/T 812 (Series 069) are used primarily for the clamped counter-face of a bolted joint. This page summarizes where they fit, the industries that rely on them, and the practical points to get right when you specify them — to GB/T 812. Stocked across roughly M101 to M1002, they cover heavy and structural work.
Typical Applications for Slotted Round Nut — GB/T 812 (Series 069)
The most common settings where these are specified:
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Bolted joints: the clamping counter-face on studs and bolts across every assembly type.
- Vibration-prone equipment: where a locking or flanged style resists loosening.
- Frames & weldments: captive or welded options for repeatable assembly.
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
How to Specify Slotted Round Nut — GB/T 812 (Series 069) for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M101–M1002; check the full table below for the exact dimensions of each size.
- Locking & grade: Match the strength grade to the bolt, and choose a locking style (nyloc, all-metal, serrated flange) if the joint sees vibration.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to GB/T 812. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Slotted Round Nut — GB/T 812 (Series 069) Are Not the Right Choice
Not on their own — they need a matching bolt or stud — and a plain nut is not a substitute for a locking type under heavy vibration.