What is BS EN 755-4 - Tolerances on dimensions and form for aluminium square bars about?  
BS EN 755-4 is a European Standard that covers aluminium and aluminium alloys. BS EN 755-4 is a set of guidelines for the aluminium and aluminium alloy for extruded rod or bar, tube, and profiles for square bars, tolerances on dimension and form.
BS EN 755-4 specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded square bars having widths across flats from 10 mm up to 220 mm.
In BS EN 755-4, the temper designations used in this part are according to EN 515.
Who is BS EN 755-4- Tolerances on dimensions and form for aluminium square bars for? 
BS EN 755-4 on tolerances on dimensions and form for aluminium square bars is useful for: 
- Manufacturers of aluminium square bars
- Bar tubes, and rod manufacturers
- Engineers, project managers and consultants
- Quality assurance services
- Oil and gas industries
- Industrial contractors
Why should you use BS EN 755-4 - Tolerances on dimensions and form for aluminium square bars?  
Specially shaped bars of square shape is made with the help of cold drawn tubes and bars. Aluminium square bars are used in posts, rails, trucks and trailers and frames and structural fabrications.
BS EN 755-4 provides users guidance on tolerances on dimensions, including width across flats, corner radii, length and squareness of cut ends to ensure compatibility with existing systems and installations.
BS EN 755-4 also provides users guidance on tolerances on forms, including straightness, convexity, concavity, twist and squareness, ensuring design accuracy and prevention of errors.
By adopting the guidance in BS EN 754-4, users can assess and develop aluminium and aluminium alloy square bars, ensuring their strength, resilience and durability in industrial applications.
What’s changed since the last update?
BS EN 755-4:2008 supersedes BS EN 755-4:1995. BS EN 755-4:2008 includes some technical changes with respect to BS EN 755-4:1995. These include: 
- Clause 2: Alloys EN AW-3102, EN AW-6008, EN AW-6010A, EN AW-6014, EN AW-6023, EN AW-6360, EN AW-6262A, EN AW-6065 and EN AW-6182 are added in Group I
- Clause 2: Alloys EN AW-5049, EN AW-7108, EN AW-7108A and EN AW-7021 are added in Group II
