BS/EN 3818-2019 pdf download.Aerospace series – Bolts, MJ threads, in titanium alloy TI- P6400 1 – Strength class: 1 100 MPa (at ambient temperature) – Technical specification.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 2859-1, Sampling procedures for inspection by attributes — Part I: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3452-1, Non-destructive testing — Penetrant testing — Part 1: General principles
ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and procedures for the assesstnent ofsurface texture
ISO 5855-2. Aerospace — Mj threads — Part 2: Limit dimensions for bolts and nuts
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature ISO 7961, Aerospace — Bolts — Test methods
3 Terms and definitions
For the purposes of this standard the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
batch
quantity of finished bolts, of the same type and same diameter, produced from a material obtained from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments
3.2
inspection lot
quantity of bolts from a single production batch with the same part number which completely defines the bolt
3.3.2
seam
open surface defect
3.3.3
lap
surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface
3.3.4
Inclusions
non-metallic particles originating from the material manufacturing process. These particles may be isolated or arranged in strings
3,4
simple random sampling
taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chosen
3.5
major defect
defect, other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose
3.6
minor defect
defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product
3.7
sampling plan
plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision
3.8
limiting quality
LQ10
in a sampling plan, the quality level which corresponds to the specified 10 % probability of acceptance
quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance. It is the maximum per cent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection can be considered satisfactory as a process average.
3.10
finished bolt
bolt ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document
3.11
definition document
document specifying all the requirements for finished bolts
4 Quality assurance
4.1 Qualification
The qualification procedure for aerospace standard products (e.g. according to EN 9133 or an equivalent aerospace accepted and established qualification procedure) shall be used and documented according to the specified tests if not otherwise agreed between customer and supplier.
Qualification inspections and tests (requirements, methods, numbers of bolts) are specified in Table 1. They shall be carried out on:
— each type and diameter of bolt;
— 20 bolts selected from a single batch by simple random sampling.
The test programme may possibly be reduced, or the qualification be granted without inspection or testing. Any such decision shall be based on the results obtained on similar types and diameters of bolts provided that the design and manufacturing conditions are identical.
Table 2 indicates the allocation of bolt samples for the inspections and tests.
4.2 Acceptance
4.2.1 Purpose
The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the bolts constituting the batch satisfy the requirements of this standard.BS/EN 3818-2019 pdf download.