JIS B 1186 High Strength Structural Bolts
JIS B 1186 bolts are high-strength structural fasteners specified for friction grip joints in steel structures. The standard covers complete sets consisting of a high-strength hexagon bolt, hexagon nut and plain washers, designed to work together to provide reliable and controlled friction-type connections. JIS B 1186 assemblies are manufactured according to requirements for dimensions, mechanical properties, thread specifications and torque coefficient values, making them suitable for demanding structural applications.
JIS B 1186 bolts are available in metric sizes and applicable strength classifications such as F8T and F10T. The standard also specifies requirements for materials, lubrication, corrosion protection, inspection and marking. These high-strength bolting assemblies are commonly used in steel buildings, bridges, industrial structures and infrastructure projects where reliable friction grip connections and controlled tightening performance are required.
Specification:
JIS B 1186 specifies sets of high-strength hexagon bolts, hexagon nuts and plain washers for friction grip joints, primarily used in steel structures. The standard defines requirements for the dimensions, screw threads, mechanical properties, torque coefficient values, materials, lubrication and anticorrosive treatment, inspection and marking of the complete bolting set. Metric coarse threads are specified according to JIS B 0205-3, with thread tolerances according to JIS B 0209-2. Bolt threads are manufactured by thread rolling, and thread inspection can be carried out using the limit gauges specified in JIS B 0251. Mechanical and dimensional inspections are performed according to the applicable JIS test methods and requirements.
| Item | Specification |
|---|---|
| Standard | JIS B 1186 |
| Product Type | High Strength Hexagon Bolt |
| Application | Friction Grip Joints |
| Size Range | M12-M30 |
| Property Class | F8T/F10T |
| Material | Carbon Steel, Alloy Steel |
| Thread Standard | JIS B 0205-3 Metric Coarse |
| Thread Tolerance | 6g |
| Tensile Test | JIS Z2241 |
| Hardness Test | JIS Z 2245 |
| Torque Tool | JIS B 4652 |
| Surface Treatment | Lubricating,HDG,Black Oxidation |
| Inspection | Dimensions, Thread,Mechanical Property,Coating |
Dimension Chart of JIS B 1186 Structural Bolts:
JIS B 1186 high-strength bolting assemblies are available in a range of metric sizes for structural steel applications. The standard specifies the dimensions of the high-strength hexagon bolt, hexagon nut and plain washers, including head dimensions, thread dimensions, bolt length and washer dimensions. The bolt uses metric coarse threads with the applicable thread tolerance specified by JIS B 1186. The dimension chart below provides commonly supplied sizes and key dimensions for reference, while detailed dimensions are controlled according to the requirements of JIS B 1186.
| Mon | M12 | M16 | M20 | M22 | M24 | M27 | M30 |
| P | 1.75 | 2 | 2.5 | 2.5 | 3 | 3 | 3.5 |
| ds max | 12.7 | 16.7 | 20.8 | 22.8 | 24.8 | 27.8 | 30.8 |
| ds min | 11.8 | 15.8 | 19.6 | 21.6 | 23.6 | 26.6 | 29.6 |
| k max | 8.8 | 10.8 | 13.9 | 14.9 | 15.9 | 17.9 | 20 |
| k min | 7.2 | 9.2 | 12.1 | 13.1 | 14.1 | 16.1 | 18 |
| s max | 22 | 27 | 32 | 36 | 41 | 46 | 50 |
| s min | 21.2 | 26.2 | 31 | 35 | 40 | 45 | 49 |
| e max | 25.4 | 31.2 | 37 | 41.6 | 47.3 | 53.1 | 57.7 |
| b max | 30 | 35 | 41 | 46 | 51 | 56 | 61 |
| b min | 25 | 30 | 35 | 40 | 45 | 50 | 55 |
Torque Coefficient:
| Size | M12 | M16 | M20 | M22 | M24 | M27 | M30 |
|---|---|---|---|---|---|---|---|
| Axial Tension for Torque Coefficient Test | 54-72KN | 99-134KN | 155-209KN | 191-259KN | 223-301KN | 290-392KN | 354-479KN |
Application of JIS B 1186 High Strength Structural Bolts:
Steel Building Structures
JIS B 1186 high-strength bolt assemblies are used for friction grip connections in steel buildings and structural frames. They are suitable for connecting structural members such as columns, beams, braces and trusses where secure and reliable bolted joints are required.
Bridges & Transportation Infrastructure
These bolting assemblies are suitable for steel bridges and transportation infrastructure where high-strength friction grip connections are required. The matched bolt, nut and washer set provides a reliable fastening solution for structural connections subject to varying loads and demanding service conditions.
Industrial & Heavy Steel Structures
JIS B 1186 bolts are also used in industrial steel structures, plant facilities, towers and other fabricated steelwork. They are suitable for structural connections where controlled tightening and consistent joint performance are important to the overall stability and reliability of the structure.