|
ISO 898 is an international standard that defines mechanical and physical properties for metric fasteners. This standard is the origin for other standards that define properties for similar metric fasteners, such as SAE J1199 and ASTM F568M.〔.〕 It is divided into five (nonconsecutive) parts: 1. Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread〔.〕 2. Nuts with specified proof load values – Coarse thread〔.〕 5. Set screws and similar threaded fasteners not under tensile stresses〔.〕 6. Nuts with specified proof load values – Fine pitch thread〔.〕 7. Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm〔.〕 With exception to part 7, which defines test standards, the parts of this standard define properties for fasteners made of carbon steel and alloy steel. The standards define that the testing must be performed at ambient temperatures, which is defined as between . The standards do not cover fasteners that would otherwise apply but require special properties, such as weldability or corrosion resistance.〔〔〔 ==Part 1: Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread== Part 1 defines the mechanical properties of bolts, screws, and studs. It specifically applies to fasteners that have an ISO metric screw thread as defined in ISO 68-1. The properties are defined for M1.6-39 with coarse threads and M8-39 with fine threads. The diameter and pitch combinations must adhere to ISO 261 and ISO 262 and the thread tolerances must adhere to ISO 965 parts 1, 2, and 4.〔 Part 1 does not specify properties for fasteners that have head geometries that reduce the shear strength of the fastener, such as low head screws and countersunk heads. It also excludes set screws, which are covered under part 5.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ISO 898」の詳細全文を読む スポンサード リンク
|