Standard No.:	GB/T 3098.14-2000
English Name:	Mechanical properties of fasteners - Widening test on nuts
Chinese Name:	紧固件机械性能 螺母扩孔试验
Chinese Classification:	J13    Fastener
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ
Issued on:	2000-9-26
Implemented on:	2001-2-1
Status:	valid
Superseding:	GB/T 5779.2-1986
Target Language:	English
File Format:	PDF
Word Count:	1500 words
Translation Price(USD):	70.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the test procedure for evaluating the acceptability of surface discontinuities designated in GB/T 5779.2 excluding nuts made of free cutting steel. It applies to nuts with: property classes to GB/T 3098.2 or GB/T 3098.4; nominal thread diameter from 5mm up to and including 39mm; product grades A and B. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB/T 3098.2-2000 Mechanical Properties of Fasteners - Nuts - Coarse Thread (idt ISO 898-2: 1992) GB/T 3098.4-2000 Mechanical Properties of Fasteners - Nuts - Fine Pitch Thread (idt ISO 898-6: 1996) GB/T 3098.9-1993 Mechanical Properties of Fasteners - Prevailing Torque Type Steel Hexagon Nuts (eqv ISO 2320: 1983) GB/T 5779.2-2000 Fasteners - Surface Discontinuities - Nuts (idt ISO 6157-2: 1995) 3 Widening Test 3.1 Principle After removal of the thread up to the nominal thread diameter a tapered mandrel is pushed into the nut. The widening is measured as a percentage of the hole diameter.

Foreword i ISO Foreword iii 1 Scope 2 Normative References 3 Widening Test 4 Criteria 5 Special Case - Prevailing Torque Type Nuts