BS EN 3005:2004 pdf free.Nuts, self-locking,MJ threads, in heat resisting nickel basealloy NI-PH1302(Waspaloy), silverplated or uncoated —Classification: 1210MPa(at ambient temperature)/730 C—Technical specification.
BS EN 3005 acceptance quality limit (AQL) a quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptancelt is the maximum per cent defective (or the maximum number of defects per hundred units) that,forpurposes of sampling inspection can be considered satisfactory as a process average.
finished nut a nut ready for use, inclusive of any possible treatments andlor surface coatings, as specified in the productstandard or definition document.
definition document document specifying all the requirements for finished nuts.
self-locking torque the torque to be applied to the nut or bolt to maintain movement of rotation in relation to the associated part,the assembly being under no axial load and the nut locking system being completely engaged with the bolt(minimum protrusion of two pitches including end chamfer)
seating torque the tightening torque to be applied to the nut or bolt to introduce or to increase the axial load in the assembly.
unseating torque the untightening torque to be applied to the nut or bolt to reduce or remove the axial load in the assembly.
breakaway torque the torque required to start unscrewing the nut or bolt with respect to the associated part, with the nut lockingdevice still fully engaged on the bolt, but after the axial load in the assembly has been removed byunscrewing half a turn followed by a halt in rotational movement.
Qualification inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1.Theyshall be carried out on:
—each type and diameter of nut;
—46 nuts selected from a single inspection lot by simple random sampling.
The test programme may possibly be reduced, or the qualification of a nut be granted without inspection ortesting.Any such decision shall be based on the results obtained on similar types and diameters of nutsprovided that the design and manufacturing conditions are identical.
Table 2 indicates the allocation of nut samples for the inspections and tests.BS EN 3005 pdf download.