BS EN 04621:2010 pdf download

BS EN 04621:2010 pdf download.Aerospace series— Inserts, MJ threads, self-locking,self-broaching keys- Technical specifications.
3.2.11
limiting quality
LQ
in a sampling plan, quality limit which corresponds to a specified 10% probabltity of acceptance
NOTE 1 It is the limiting lot quality characteristic that the consumer is willing to accept with a low probability that a lot of this quaMy would occur
NOTE 2 For the pxposes of this standerd, the lwmtmg quality quoted in Table 4 corresponds to a probability 01 acceptance of 10.
3.2.12
acceptance quality limit
AQL
quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance
NOTE It Is the maximum percent defective (or the maximum number of defects per hundred Imi(s) that: for purposes of sampling inspection, can be considered satisfactory as a process average.
3.2.13
finished insert
insert ready for use. inclusive of any possible treatments andlor surface coatings, as specified in the definition document
3.2.14
definition document
document specifying all the requirements for finished inserts
3.2.15
self-locking torque
ttorque to be applied to the associated bolt to maintain movement of rotation m relation to the part, the assembly being under no axial load end the insert locking zone beiog completely engaged with the bolt (minimum protrusion of Iwo pitches, including the end chamfer)
3.2.16
seating torque
tightening torque to be applied to the Insert or bolt to introduce or to increase the axial load in the assembly
3.2.17
unseatIng torque
untightening torque to be applied to the insert or bolt to reduce or remove the axial load in the assembly
3.2.18
breakaway torque
torque required to start unscrewing the insert or the bolt from the associated part, with the insert locking device still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewing half a turn followed by a halt in rotational movement
4 Quality assurance
4.1 Qualification EN 9133.
Qualification inspections and tests (requirements, methods, numbers of inserts with self-broaching keys) are specified in Table I They shall be carried out on:
— each type and diameter of inserts.
— 39 inserts selected from a single batch by simple random sampling.
The test programme may possibly be reduced, or the qualification be grantea without inspection or testing. Any such decision shall be based on the results obtained on similar types and diameters of inserts provided that the design and manufacturing conditions are identical, Table 2 indicates the allocation of insert samples for the inspections and tests.
4.2 Acceptance
42.1 Purpose
The purpose of acceptance Inspections and tests is to check, as sWnply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the inserts constituting the batch satisfy the requirements of this standard.
4.2.2 Conditions
Acceptance inspections and tests (requirements, methods, numbers of inserts) are specified In Table 1. They shall be carried out on each batch inserts from the batch to be tested shall be selected by simple random sampling.
Each insert may be submitted to several inspections or tests
If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspections and tests. In the case, the number of inserts submitted to these inspections and tests is the same as that submitted for qualification inspection and tests.
4.2.3 ResponsibIlity
Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibilty.
4.2.4 Inspection and test report
A test report showing actual numerical values shall be provided if specified In the purchase order.
5 Requirements
See Table 1.