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BS EN ISO 4759-3:2016 pdf free

BS EN ISO 4759-3:2016 pdf free.Tolerances for fasteners Part 3: Washers for bolts, screws and nuts一Product grades A, C and F (ISO 4759-3:2016).
This part of Iso 4759 specifies tolerances for flat washers of product grades A, C and F with nominal diameters of 1 mm to 150 mm inclusive, designed to be used in bolted joints in combination with bolts, screws, studs and nuts.
This part of ISO 4759 may be applied to non-flat washers however it does not include all the tolerances related to these washers.
It applies to non-captive and captive washers, and to standard and nonstandard washers. It does not apply to dynamic disc springs.
Washers of product grades F and A are intended to be used with bolts, screws, studs and nuts of product grades A and B; washers of product grade C are intended to be used with bolts, screws, studs and nuts of product grade C.
NOTE The product grade refers to a specific tolerance range related to dimensional and geometrical characteristics (product grade F for fine tolerances, product grade A for precise tolerances, product grade C for large tolerances).
AnnexA presents tolerances taken from ISO 286-1 and ISO 286-2.
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.
ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form, orientation, location and run-out
ISO 2692, Geometrical product specifications (GPS) — Geometrical tolerancing — Maximum material requirement (MMR), least material requirement (LMR) and reciprocity requirement (RPR)
3 Symbols
c1 height of the internal chamfer, mm
c2 height of the external chamfer, mm
d1 clearance hole, mm
d2 outside diameter, mm
ei radial difference between the clearance hole (area subject to shearing) and the end of the brittle fracture on the hearing side of the washer
e2 radial difference between the outside diameter (area subject to shearing) and the end of the brittle fracture on the bearing side of the washer
heff effective height of the washer, mm
t nominal thickness of the washer, mm teff effective thickness of the washer, mm
L1 part of the clearance hole within the tolerance specified ford1
t2 part of the outside diameter within the tolerance specified ford2
y coaxiality, mm
z flatness (deflection), mm
4 Tolerances
The tolerances for washers of product grades A, C and F are specified in Table 1.
Unless otherwise specified, the tolerances specified in this part of ISO 4759 apply to washers prior to coating.
Deviations from the tolerances specified in this part of ISO 4759 are permitted in product standards only for valid technical reasons. In cases where there is a difference between the tolerance requirements in this part of ISO 4759 and the product standard, the latter takes precedence.
The tolerances of form and position are specified and Indicated according to the definitions of ISO 1101 and ISO 2692.BS EN ISO 4759-3 pdf free download.

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