Product Specifications
| Model / Specification | M4–M36 |
| Material | Carbon Steel |
| Thread size d |
M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M24 | M30 | M36 | |
| P | Pitch | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3 | 3.5 | 4 |
| d2 | Nom. | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 16 | 20 | 20 | 30 |
| Min. | 3.060 | 4.070 | 5.070 | 6.070 | 8.080 | 10.080 | 12.095 | 16.095 | 20.110 | 25.110 | 30.110 | |
| Max. | 3.160 | 4.190 | 5.190 | 6.190 | 8.230 | 10.230 | 12.275 | 16.275 | 20.320 | 25.320 | 30.320 | |
| s | Nom. | 5 | 6 | 8 | 10 | 12 | 14 | 18 | 22 | 26 | 34 | 40 |
| Min. | 4.75 | 5.75 | 7.70 | 9.70 | 11.635 | 13.635 | 17.635 | 21.56 | 25.56 | 33.5 | 39.48 | |
| Max. | 4.93 | 5.93 | 7.92 | 9.92 | 11.905 | 13.905 | 17.905 | 21.89 | 25.89 | 33.88 | 39.87 | |
| b | 14 | 16 | 18 | 22 | 26 | 30 | 38 | 52 | 60 | 72 | 84 | |
| Sd | 8 | 10 | 12 | 14 | 18 | 20 | 28 | 34 | 42 | 52 | 64 | |
| x | Max. | 1.75 | 2 | 2.5 | 3.2 | 3.8 | 4.2 | 5 | 6.3 | 7.5 | 8.8 | 10 |
| r | Min. | 3 | 4 | 5 | 5 | 6 | 8 | 10 | 12 | 16 | 20 | 22 |
| Wt./1,000 pcs (steel) | - | - | - | - | - | - | - | - | - | - | - | |
Eye Bolt — Product Introduction
An eye bolt is a standard fastener featuring a circular ring (eye) at the head and a threaded shank. The ring portion can be mated with pins, cotter pins, or similar components to form a pivoting joint, allowing the connected members to rotate around the pin axis; the threaded portion can be screwed into a threaded hole or pass through the workpieces and be secured with a nut, making it widely used in mechanical locations that require movable connections, frequent assembly/disassembly, or angular adjustment.
I. Product Features
- Circular ring head: Can be paired with pins or cotter pins to form a movable pivot point.
- Threaded shank: Can be screwed into a threaded hole or pass through the connected parts and be fastened with a nut.
- High standardization: Manufactured to dimensional specifications per GB 798-1988 with good interchangeability, facilitating procurement and replacement.
- Diverse materials and surface treatments: Common materials include carbon steel and stainless steel; surfaces can be zinc-plated, blackened, or passivated to meet different corrosion-resistance requirements.
- Simple and compact structure: Easy to manufacture, low cost, suitable for high-volume use.
II. Product Advantages
- Enables movable connections: Connected parts can rotate around the pin axis, avoiding seizure or interference caused by rigid connections.
- Easy assembly and disassembly: Convenient for adjustment, maintenance, and replacement — ideal for locations requiring frequent disassembly.
- Good load-bearing capacity: Can withstand axial tension and considerable shear force at the pin; when used with a cotter pin, it prevents loosening and detachment.
- High versatility: As a standard component with complete specifications, it easily mates with pins, nuts, and other hardware.
- Wide adaptability: Carbon steel and stainless steel options can meet requirements for general machinery, outdoor, humid, and corrosive environments.
III. Application Scope
- Mechanical equipment: Movable connection points such as doors, covers, housings, tilting mechanisms, connecting rods, and articulated supports.
- Valves and pipelines: Applications requiring articulated connections or adjustment in valves, pumps, flanges, and pipe fittings.
- Automotive and agricultural machinery: Articulation and connection points in tractors, harvesters, construction machinery, and vehicle chassis.
- Shipbuilding, metallurgy, and mining: Movable connection points in ship fittings, metallurgical equipment, mining machinery, and lifting/transportation equipment.
- General industry: Any fastening connection that requires frequent assembly/disassembly, angle adjustment, or permitted relative rotation.
