ASME B 18.31.5 HR Round Bend J Bolts
ASME B18.31.5-2011 (R2021) covers bent bolts in inch-series dimensions and includes specific requirements for J-Bolts with offset round bends. The standard defines the main dimensions used to specify a J-Bolt, including the nominal diameter (D), length (L), inside bend dimension (C), thread length (T), and additional dimensions such as E, M, and N where applicable. The bend radius (R) for J-Bolts is related to the inside bend dimension and is defined as C/2. J-Bolts can be ordered by the dimensions shown in the standard drawing when a specific standard size is not established.
We manufacture ASME B18.31.5 J-Bolts in carbon steel, alloy steel, and stainless steel. Available materials and grades can be selected according to the required strength, corrosion resistance, temperature, and service conditions. Common options include carbon steel for general-purpose applications, alloy steel for higher-strength requirements, and stainless steel such as 304 and 316 for applications requiring greater corrosion resistance. Plain, zinc-plated, hot-dip galvanized, and other surface finishes can also be supplied according to the material and application requirements.
Specification:
J-Bolts are bent bolts with a threaded straight section and a J-shaped bend at the opposite end. ASME B18.31.5 covers inch-series bent bolts, including J-Bolts with offset round bends, and defines the general requirements and dimensional details for these products. We manufacture J-Bolts according to ASME B18.31.5 and can supply different diameters, lengths, thread configurations, materials, and surface finishes according to the application or customer requirements. Hot-dip galvanized J-Bolts are available for applications requiring additional corrosion protection.
| Item | Specification |
|---|---|
| Standard | ASME B 18.31.5 HR |
| Product Type | Round Bend J Bolts |
| Size Range | 3/8"-4" |
| Mechanical Property Standard | SAE J429, F593,A307,F1554,A193,A320 |
| Property Class | GR.2.5.8 B8,B8M,B7,L7,GR.36,55,105 F593C,D,G,H |
| Material | Carbon Steel,Alloy Steel,Stainless Steel |
| Thread | UNC |
| Thread Standard | ASME B 1.1 |
| Surface Treatment | Bright Finish, Hot Dip Galvanized, Zinc Plated, Black Oxidation |
| Hdg Standard | ASTM F2329 |
| Compatiable Nut | ASTM A563 |
| Compatiable Washer | ASTM F436 |
| Inspection | Dimensions, Thread,Mechanical Property,Coating |
Dimension Chart of ASME B 18.31.5 HR Round Bend J Bolts:
The dimensions of J-Bolts include the nominal diameter, overall length, bend length, thread length, and other dimensions of the bent section. ASME B18.31.5 provides the dimensional requirements and reference dimensions for J-Bolts with offset round bends. The dimension chart below provides the main dimensions of J-Bolts according to ASME B18.31.5. Standard and custom sizes can be supplied according to the required dimensions, thread specifications, and customer drawings.
Application of ASME B 18.31.5 HR Round Bend J Bolts:
J-Bolts are used where a bent fastening point is required instead of a conventional straight bolt. The offset round bend allows the bolt to be embedded, positioned around a component, or secured through a supporting structure. Depending on the material, dimensions, and installation method, ASME B18.31.5 J-Bolts can be used in construction, equipment installation, structural work, and general fastening applications.
Concrete Foundations and Structural Installation
J-Bolts are commonly used to secure structural components, equipment bases, steel frames, and other assemblies to concrete foundations. The bent end can be embedded into concrete while the threaded end remains accessible for attaching a nut and securing the component. Carbon steel and alloy steel are commonly selected where strength is the main requirement, while stainless steel J-Bolts can be used in applications where corrosion resistance is important.
Equipment and Machinery Mounting
J-Bolts can be used for mounting equipment, machinery, support frames, brackets, and fabricated steel components. Their bent shape provides an alternative fastening arrangement when access for a conventional bolt is limited or when the bolt needs to be retained by a fixed structure. Different bolt diameters, lengths, bend dimensions, thread sizes, and materials can be selected according to the installation requirements.
Pipe, Cable and General Support Applications
J-Bolts can also be used for securing pipes, tubes, cables, supports, and other components where a hooked or bent fastening point is useful. Stainless steel J-Bolts, including 304 and 316 stainless steel, are suitable for applications exposed to moisture or corrosive environments. Carbon steel and alloy steel versions are available for general industrial and structural applications where higher strength or a specific mechanical property is required.