JSA - JIS B 1051
Mechanical properties of fasteners made of carbon steel and alloy steel- Bolts, screws and studs with specified property classes-Coarse thread and fine pitch thread
|Publication Date:||22 September 2014|
|ICS Code (Bolts, screws, studs):||21.060.10|
This Standard specifies mechanical and physical properties of bolts, screws and studs made of carbon steel and alloy steel when tested at an ambient temperature range of 10°C to 35 °C. Fasteners (the term used when bolts, screws and studs are considered all together) that conform to the requirements of this Standard are evaluated at that ambient temperature range. They might not retain the specified mechanical and physical properties at elevated temperatures (see Annex B) and/or lower temperatures.
NOTE 1 Fasteners conforming to the requirements of this Standard are used in applications ranging from -50°C to + 150 °C. Users are advised to consult an experienced fastener metallurgist for temperatures outside the range of -50°C to + 150 °C and up to a maximum temperature of +300 °C when determining appropriate choices for a given application.
NOTE 2 Information for the selection and application of steels for use at lower and elevated temperatures is given, for example, in EN 10269, ASTM F2281 and in ASTM A320/A320M.
Certain bolts and screws might not fulfil the tensile or torsional requirements of this Standard because the geometry of their heads reduces the shear area in the head compared to the stress area in the thread. These include bolts and screws having a low or countersunk head (see 8.2).
This Standard is applicable to bolts, screws and studs
- made of carbon steel or alloy steel,
- having triangular ISO metric screw thread in accordance with JIS B 0205-1,
- with coarse pitch thread M1.6 to M39, and fine pitch thread M8x 1 to M39x3,
- with diameter/pitch combinations in accordance with JIS B 0205-2 and JIS B 0205-3, and
- having thread tolerances in accordance with JIS B 0209-1, JIS B 0209-2 and JIS B 0209-4.
It is not applicable to set screws and similar threaded fasteners not under tensile stress (see JIS B 1053).
It does not specify requirements for such properties as
- corrosion resistance,
- resistance to shear stress,
- torque/clamp force performance (for test method, see JIS B 1084), or
- fatigue resistance.
NOTE: The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows:
ISO 898-1: 2013 Mechanical properties of fasteners made of carbon steel and alloy steel-Part 1: Bolts, screws and studs with specified property classes-Coarse thread and fine pitch thread (IDT)
The symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISOI/IEC Guide 21-1.