BS EN ISO 4759-3:2016

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BS EN ISO 4759-3:2016 supersedes BS EN ISO 4759-3:2000 which is withdrawn.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