BS EN 3328:2008 – Aerospace series — Bolts, double hexagon head, close tolerance, medium thread length, in heat resisting steel FE-PM38 (FV535), uncoated — Classification: 1 000 MPa/550 °C
1 Scope
This standard specifies the dimensions of the uncoated double hexagon head bolts, close tolerance, with MJ thread, medium thread length, in heat resisting steel FE-PM38 for aerospace applications.
Maximum test temperature of the parts is 550 °C.
These bolts are to be used in aerospace fastening systems mainly stressed in shearing force.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
EN 2424, Aerospace series — Marking of aerospace products 1 )
EN 2493, Aerospace series — Heat resisting steel FE-PM38 — 1 000 MPa ≤ R m ≤ 1 140 MPa — Bars
EN 3302, Aerospace series — Bolts in heat resisting steel FE-PM38 (FV535) — Classification:
1 000 MPa/550 °C — Technical specification 1 )
ISO 3353-1 , Aerospace — Lead and runout threads — Part 1: Rolled external threads
ISO 4095, Aerospace — Bihexagonal drives — Wrenching configuration — Metric series
ISO 5855-1 , Aerospace — MJ threads — Part 1: General requirements
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
3 Required characteristics
3.1 Configuration, dimensions, tolerances, masses
Configuration shall be in accordance with Figure 1 . Dimensions, tolerances and masses shall conform to Figure 1 and Tables 1 and 2. Details of form, not stated are at the manufacturer’s option.
3.2 Material
Heat resisting steel FE-PM38 according to EN 2493.
3.3 Surface treatment
None.
3.4 Thread surface
See Figure 1 .
4 Designation
Each double hexagon head bolt, close tolerance, shall only be designated as in the following example:
Description block Identity block
Bolt EN 3328 — 080 — 050
Number of EN standard
Nominal diameter code (see Table 1 )
Length code (see Table 2)
If necessary the originator code I9005 shall be placed between the description block and the identity block.
5 Marking
Each double hexagon head bolt, close tolerance, shall be marked in accordance with EN 2424, Style A.
6 Technical specification
The double hexagon head bolts, close tolerance, shall conform to the requirements of EN 3302.
BS EN 3328:2008 – Aerospace series — Bolts, double hexagon head, close tolerance, medium thread length, in heat resisting steel FE-PM38 (FV535), uncoated — Classification: 1 000 MPa/550 °C