Jis B1051 Pdf Free Verified Jun 2026

The official publisher allows you to view or purchase the official, updated English or Japanese PDF versions of JIS B1051.

NBK and Miki Pulley offer technical summaries and excerpts of JIS B 1051:2014 tables, which are highly useful for engineering data (tensile strength, hardness, torque).

The standard ensures that fasteners used in automotive, machinery, and structural applications meet strict performance thresholds to prevent mechanical failure. Scope of the Standard : Bolts, screws, and studs. Thread types : Metric ISO threads. Material composition : Carbon steel and alloy steel. jis b1051 pdf free

For example, a property class 8.8 bolt must have a nominal tensile strength of 800 N/mm² and a yield strength of 640 N/mm². This classification system allows engineers to select the appropriate fastener based on the load requirements of their application. The standard states that products conforming to the requirements of this Standard are evaluated only in the ambient temperature range and may not retain the specified mechanical and physical properties at higher and lower temperatures.

Represents 10 times the ratio between the lower yield stress (or proof stress) and the nominal tensile strength. Common JIS B1051 Property Classes Property Class Nominal Tensile Strength (MPa) Minimum Yield Strength (MPa) Typical Applications 4.6 Light-duty brackets, general assembly 8.8 Automotive chassis, structural steel, machinery 10.9 High-stress engine parts, heavy industrial equipment 12.9 Ultra-high strength aerospace, racing components Testing Requirements Mandated by JIS B1051 The official publisher allows you to view or

Explains how the property class numbers are derived (e.g., the first number relates to nominal tensile strength).

Document previews and older versions (e.g., 1991 or 2000 editions) are hosted on platforms like Scribd . Scope of the Standard : Bolts, screws, and studs

The Japanese Standards Association sells the official PDF for roughly (~$28–$38 USD). While not free, this is cheaper than many ISO or ASTM standards. You get:

Assures the fastener's toughness, especially in lower-temperature environments. Important Exclusions

If you work in mechanical engineering, manufacturing, or quality assurance, you know that accurate specifications are the backbone of a successful project. You might have found this page by searching for in hopes of quickly grabbing a copy of this essential standard.

In Japan, many university libraries and major public libraries subscribe to the JSA Webdesk. These institutions often provide of JIS standards. Accessing these requires library registration, and typically, printing or downloading is not permitted, but it is an excellent way to read the standard at no cost.