: The point at which the fastener begins to deform permanently.
One of the most valuable aspects of JIS B 1051 is its classification system. Fasteners are designated by a 2-part property class code, such as , 8.8 , or 12.9 . First Number: Represents of the nominal tensile strength in N/mm2N/mm squared
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To comply with JIS B1051, manufacturers must subject fasteners to rigorous mechanical testing. These tests ensure the components will not shear or deform prematurely under load: jis b1051 pdf free
For full access, you must purchase the standard. On the JSA Web Store, you can buy and immediately download JIS B 1051:2014 in PDF format. The current official prices are as follows, based on the 56-page document:
Engineers, manufacturers, and procurement specialists frequently need to verify the material and mechanical specifications of structural fasteners. Finding official, authorized documentation is critical for ensuring compliance and structural integrity.
: While not the primary source for JIS standards, some JIS standards are adopted or referenced by international organizations like ISO. You might find related standards or translations. : The point at which the fastener begins
represents 10 times the ratio between the lower yield stress (or proof stress) and nominal tensile strength. For class 8.8, the yield strength is 80% of the tensile strength (approx. 640 MPa). Testing Parameters Mandated by JIS B 1051
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The keyword is commonly searched by engineers and manufacturers looking for the Japanese Industrial Standard that specifies the mechanical properties of fasteners. JIS B 1051 is the foundational standard for bolts, screws, and studs made of carbon and alloy steel. Understanding JIS B 1051 First Number: Represents of the nominal tensile strength
JIS B1051 is a Japanese Industrial Standard that specifies the "Hexagon head bolts with coarse thread and fine thread". Here's a brief guide:
Article Title: Understanding JIS B 1051: Mechanical Properties of Steel Fasteners JIS B 1051
| Section | Description | Content Details | | :--- | :--- | :--- | | | Defines the types of fasteners covered. | Carbon steel & alloy steel bolts, screws, & studs tested at 10°C to 35°C | | 2. Normative References | Lists other essential standards. | Other standards cited within this document | | 3. Definitions & Symbols | Clarifies terminology. | Standardizes specific terms and symbols used throughout the document | | 4-5. Property Classes | The fastener grading system. | Defines strength grades (e.g., 4.6, 8.8, 10.9, 12.9) | | 6. Materials | Specifies acceptable steel types. | Requirements for chemical composition of raw materials | | 7-9. Test Methods | Outlines 15+ required test methods. | Tensile proof load, hardness, decarburization, and impact tests | | 10. Marking | Details identification requirements. | Specifies required markings on fastener heads |
JIS B 1051 is technically aligned with ISO 898-1, meaning the mechanical properties and test methods are largely identical. However, JIS B 1051 may have some country-specific notes or modifications that make it the required standard for use in Japan or for Japanese-designed products.