BS EN ISO 898-2:2012 pdf free.Mechanical properties of fasteners made of carbon steel and alloy steel Part 2: Nuts with specified property classes – carse thread and fine pitch thread (ISO 898-2:2012).
This part of ISO 898 specifies mechanical and physical properties of nuts with coarse thread and fine pitch thread made of carbon steel and alloy steel when tested at an ambient temperature range of 10 °C to 35 °C.
Nuts conforming to the requirements of this part of ISO 898 are evaluated at that ambient temperature range. It is possible that they do not retain the specified mechanical and physical properties at elevated and/or lower temperatures.
NOTE 1 Nuts conforming to the requirements of this part of ISO 898 have been used in applications ranging from —50 °C to +150 C. It is the responsibility of users to consult an experienced fastener materials expert for temperatures outside the range of —50 C to +150 C and up to a maximum temperature of +300C to determine 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 instance in EN 10269, ASTM F2281 and in ASTM A320/A320M.
This part of ISO 898 is applicable to nuts:
a) made of carbon steel or alloy steel;
b) with coarse thread M5 < D < M39, and fine pitch thread M8x1 < D < M39x3;
c) with triangular ISO metric thread according to ISO 68-1:
d) with diameter/pitch combinations according to ISO 261 and ISO 262:
e) with specified property classes, including proof load:
f) with different nut styles: thin nuts, regular nuts and high nuts:
g) with minimum height m  0.45!);
h) with a minimum outside diameter or width across flats s  145!) (see Annex A);
i) able to mate with bolts, screws and studs with property classes according to ISO 898-1.
For hot dip galvanized nuts, see ISO 10684.
This part of ISO 898 does not specify requirements for properties such as:
— prevailing torque properties (see ISO 2320):
— torque/clamp force properties (see ISO 16047 for test method):
— weldability;
— corrosion resistance.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6157-2, Fasteners — Surface disco ntinuities — Part 2: Nuts
ISO 6506-1, Metallic matenals — Bnnell hardness test — Part 1: Test method
ISO 6507.1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, 0, E, F, G, H, K, N, T)
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7500.1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 16426. Fasteners — Quality assurance system
3 Symbols
For the purposes of this document, the following symbols apply.
D nominal thread diameter of the nut, in millimetres
‘lb hole diameter of the grip, in millimetres
F load, In newtons
Ii thickness of the grip, in millimetres
rn height of the nut, in millimetres
P pdch of the thread, in millimetres
s width across flats, in millimetres
4 Designation systems
4.1 Designation of nut styles
This part of ISO 898 specifies requirements for three styles of nuts according to their height:
— style 2: high nut with minimum height rnmin 0,9D or mmjn > 0.9D, see Table Al;
— style 1: regular nut with minimum height ‘mi,  0,8D; see Table Al.BS EN ISO 898-2 pdf free download.