What is ISO 4759-3 - Tolerances for fasteners about?

ISO 4759 is a series of international standards tolerances for fasteners the required tolerances washers for bolts, screws, and nuts. ISO 4759-3 is the third part of a series of documents on tolerances for fasteners.ISO 4759-3 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.

ISO 4759-3 may be applied to non-flat washers however it does not include all the tolerances related to these washers.

ISO 4759-3 applies to non-captive and captive washers, and to standard and non-standard 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).

Who is ISO 4759-3 - Tolerances for fasteners for?

ISO 4759-3 on tolerances for fasteners is relevant to:

Manufacturer of fasteners
Suppliers and consumers of fasteners

Why should you use ISO 4759-3 - Tolerances for fasteners?

Fasteners are several parts of any machine whether it is big or small. These parts are joined in different ways according to their role and position in a machine. Such holding devices as nuts, bolts, screws, keys, washers, rivets, anchors, studs, inserts, rings and pins are called fasteners.

ISO 4759-3 provides guidance on the feature, thickness, tolerances, product grade of fasteners.

ISO 4759-3 exemplifies the required tolerances that help you achieve precision in terms of product functionality and specification. With obedience and compliance to ISO 4759-3, you can efficiently manufacture or buy precies high-quality fasteners.

What’s changed since the last update?

BS EN ISO 4759-3:2016 supersedes BS EN ISO 4759-3:2000 which is withdrawn.

In comparison to ISO 4759-3:2000, the following changes have been made.

The scope has been amended
The normative references have been updated
A new clause 3 “symbols and abbreviated terms” has been added
New product grade f has been included (f for fine tolerances)
Tolerances for chamfers have been included
In table a.1 tolerances for standard tolerance grades it11 and it14 have been included and it16 has been deleted
In tables a.2 and a.3 limit deviations for tolerance classes h13 and h12 respectively have been included
This part of iso 4759 has been editorially revised

BS EN ISO 4759-3:2016

Tolerances for fasteners - Washers for bolts, screws and nuts. Product grades A, C and F

Current

Published:

31 Jul 2016