BS EN 4074-2009 pdf download.Aerospace series Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVD coated Classification: 1 100 MPa (at ambient temperature) / 425 °C.
This BS EN 4074 specifies the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, aluminium IVO coated.
Classification: 1100 MPa 1)/425 C 2)
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cdeci applies. For undated references, the latest edition of the referenced document (induding any amendments) applies.
EN 2424. Aerospace senes — Marking of aerospace products.
EN 3911, Aerospace series — Six lobe recess — Geometncal definition. 3)
EN 9100. Aerospace senes — Quality management systems — Requirements (based on ISO 9001:2000) and
Quality systems — Model for quality assurance in design, development, production, installation and servicing
(based on ISO 9001:1994).
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts.
ISO 3353-1, Aerospace — Lead and rursout threads — Part 1: Rolled external threads.
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts.
ISO 7913, Aerospace — Bolts and screws, metric— Tolerances of form and position.
ISO 9152, Aerospace — Bolts, with MJ threads, in titanium alloys, strength class 1100 MPa — Procurement speciflcation
TR 3775, Aerospace series — Bolts and pins — Materials. 4)
MIL-DTL-83488D, Coating, aluminum, high purity. 5)
NAS 1800-90. Recess, six lobe drive — Internal — Dimensions for recess and gages. 6)
3 Required characteristics
3.1 Configuration — Dimensions — Masses
See Figure 1 and Table 1.
Dimensions and tolerances are expressed in millimetres and apply after surface treatment.
3.2 Tolerances of form and position
Iso 7913 and those specified in Figure 1 and Table 1.
3.3 Materials
TR 3775 (titanium alloy, classification 1100 MPa).
3.4 Surface treatment MIL-DTL-83488D, Type II, class 3, 4 pm to 12 pm. After aluminium deposit:
a) mechanical blasting, followed by a chromate conversion coating within 24 h max. 7);
b) optional lubrication with cethylic alcohol (code E).
6 Technical specification
ISO 9152, except for clauses:
a) Approval of manufacturers: see EN 9100:
b) Qualification of bolts: see EN 9133.BS EN 4074-2009 pdf download.