BS/EN 4178-2017 pdf download.Aerospace series Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized, MoS2 lubricated Classification:1100 MPa (at ambient temperature) / 315 °C.
This BS/EN 4178 specifies the characteristics of screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in titanium alloy, anodized. M0S2 lubricated.
Classification: 1100 MPa i) / 315 °C z).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2424. Aerospace series — Marking of aerospace products
EN 2491, Aerospace series — Molybdenum disuiphide thy lubricants — Coating methods
EN 3911, Aerospace series — Six lobe recess — Geometrical definition
EN 9100, Quality Management Systems — Requirements forAviation, Space and Defense Organizations
EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace
standard parts
ISO 3353-1, Aerospace — Lead and runout threads — Part 1: Rolled external threads 3)
ISO 58552, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts 3)
ISO 7913, Aerospace — Bolts and screws, metric — Tolerances ofform and position 3)
1509152, Aerospace — Bolts, with Mj threads, in titanium alloys, strength class .1100 MPa — Procurement specification 3)
TR 3775, Aerospace series — Bolts mid pins — Materials 4)
TR 4070. Aerospace series — Molybdenum disulphide coatings — List of commercial products 4)
3 Required characteristics
3.1 Configuration – Dimensions – Masses
See Figure 1 and Table 1.
Dimensions and tolerances are expressed in millimetres and apply after anodizing but before lubricating.
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
Lubrication:
a) Lubricant: see Clause 4;
b) Application: EN 2491, 5 pm to 10 pm.BS/EN 4178-2017 pdf download.