ISO 898-3 Specification specifies mechanical and physical properties of flat washers, designed to be used in bolted joints in combination with bolts, screws, studs and nuts with a specified property class in accordance with ISO 898-1 and ISO 898-2.
NOTE 1 : These types of washers can also be used with other fasteners such as screws forming their own mating thread.
Washers that conform to the requirements of ISO 898-3 are evaluated at an ambient temperature range of 10 °C to 35 °C. They might not retain the specified mechanical and physical properties at elevated temperatures and/or lower temperatures.
NOTE 2 : Washers conforming to the requirements of this document are used in applications ranging from −50 °C to +150 °C. Users are advised to consult an experienced fastener expert for temperatures outside this range and up to a maximum temperature of +300 °C when determining appropriate choices, or for critical applications.
|Property class||Material and process||Chemical composition limits (cast analysis, %) a,b,c||Minimum tempering temperature b,c °C|
|Material||Process||C||P max.||S max.||B d max.|
|100HV||Steel||Hot/cold rolled||Material selection shall be at the manufacturer's discretion, provided that the requirements of are fulfilled.||NA|
|200HV e||Steel||Hot/cold rolled or quenched and tempered||Material selection shall be at the manufacturer's discretion, provided that the requirements of are fulfilled.||NA|
|300HV f||Carbon steel g||Quenched and tempered||0.17||0.8||0.035||0.035||0.003||425|
|Alloy steel h||0.14||1.3||0.035||0.035||0.003||425|
|380HV f,i||Carbon steel g||Quenched and tempered||0.4||0.8||0.035||0.035||0.003||425|
|Property class||100HV||200HV||300HV||380HV a|
|Vickers hardness, HV||min.||100||200||300||380|
|Rockwell hardness, HRC||min.||-||-||30||39|
|Partial decarburization, HV 0,3||max.||-||-||c||30 d|
|Depth of the complete decarburization, G||max.||-||-||c||2 % of t eff or 0,02 mm e|
|Carburization, HV 0,3||max.||-||-||c||30 f|
|Reduction of hardness after retem- pering, HV 10||max.||-||-||20||20|
|Property class||For routine inspection||In case of dispute|
|100HV||Bearing surface||Bearing surface|
|300HV||Hardness in the transverse section|
Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.