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है”ह”ह

IS 15569 (2005): Widening test on nuts [PGD 31: Bolts, Nutsand Fasteners Accessories]

IS 15569:2005ISO 10484:1997

Wwfkm-m

i’iwkl-l-?@MJT

Indian Standard

WIDENING TEST ON NUTS

ICS 21.060.20

.

@ BIS 2005

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

March 2005 Price Group 2

.

- ..:

Bolts, Nuts and Fasteners Accessories Sectional Committee, MGP 33

NATIONAL FOREWORD

This Indian Standard (Second Revision) which is identical with ISO 10484:1997 ‘Widening test on nuts’issued by the International Organization for Standardization (ISO) was adopted by the Bureau of IndianStandards on the recommendations of the Bolts, Nuts and Fasteners Accessories Sectional Committeeand approval of the Medical Instruments, General and Production Engineering Division Council.

The text ofdeviations.Standards.

a)

b)

ISO Standard has been approved as suitable for publication as an Indian Standard withoutCertain terminology and conventions are, however, not identical to those used in IndianAttention is drawn especially to the following:

Wherever the words ‘International Standard’ appear referring to this standard, they shouldbe read as ‘Indian Standard’.

Comma (,) has been used as a decimal marker while in Indian Standards, the current practiceis to use a point (.) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards, which are to be substituted in their place, are listedbelow along with their degree of equivalence for the editions indicated:

International Standard

ISO 898-2 : 1992 Mechanicalproperties of fasteners — Part 2:Nuts with specified proof loadvalues — Coarse thread

ISO 898-6 : 1994 Mechanicalproperties of fasteners — Part 6:Nuts with specified proof loadvalues — Fine pitch thread

ISO 2320:1997 Prevailing torquetype steel hexagon nuts —Mechanical and performanceproperties

ISO 6157-2:1995 FastenersSurface discontinuities — Part 2:Nuts

Corresponding Indian Standard Degree ofEquivalence

IS 1367 (Part 6): 1994 Technical supply Identical ~‘conditions for threaded steel fasteners:Part 6 Mechanical properties and testmethods for nuts with specified proof loads(third revision)

IS 13096:2000 Fasteners — Hexagon nutswith specified proof load values — Finepitch threads — Mechanical properties (first

revision)

IS 1367 (Part 8) :2002 Technical supplyconditions for threaded steel fasteners:Part 8 Prevailing torque type steel hexagonnuts — Mechanical and performanceproperties (third revision)

IS 1367 (Part 10) :2002 Technical supply doconditions for threaded steel fasteners:Part 10 Surface discontinuities — Nuts

do

do

(third revision)

For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test, shall be rounded off in accordance withIS 2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retainedin the rounded off value should be the same as that of the specified value in this standard.

IS 15569:2005ISO 10484:1997

Indian Standard

WIDENING TEST ON NUTS

1 Scope

This International Standard specifies the test procedure for evaluating the acceptability of surfacediscontinuities designated in ISO 6157-2 excluding nuts made of free cutting steel.

It applies to nuts with

- property classes to ISO 898-2 and ISO 898-6;

—nominal thread diameter, d, from 5 mm up to and including 39 mm;

- product grades A and B.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the editions indicated were valid. All standards are subjectto revision, and parties to agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards indicated below. Members of IEC and ISOmaintain registers of currently valid International Standards.

ISO 898-2:1992, Mechanical properties of fasteners - Part 2: Nuts with specified proof /oad values - Coarsethread.

ISO 898-6:1994, Mechanical propeffies of fasteners - Part 6: Nuts with specified proof load values - Fine pitchthread.

ISO 2320:1997, Prevailing torque type steel hexagon nuts - Mechanical and performance properties,

ISO 6157-2:1995, Fasteners - Surface discontinuities - Part 2: Nuts.

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.

3.2 Test mandrel

The test mandrel shown in figure 1 shall be used for measurement of widening of 6 ‘Y. or 4 % respectively (seeclause 4). It shall have a minimum hardness of not less than 45 HRC and the cone shall be polished

{roughness R.= 2,5 urn).

3.3 Test nut

The nut to be subjected to the widening test shall have the thread removed to a diameter equal to the nomina,diameter of the thread with the tolerance H12.

1

,.

IS 15569:20051s0 10484:1997

3.4 Procedure

Prior to the test, lubricate the mandrel with molybdenum disulphide (MoS,).

Insert the mandrel into the nut as shown in figure 2 and apply a load axially in a slow and continuous manneruntil the mandrel is pushed through the hole up to the cylindrical part. The mandrel shall be tightly clamped atthe upper end. For reference purposes the speed of insertion shall not exceed 25 mm/min.

4 Criteria .

The total widening of nuts shall be

6 % for nuts of property classes 4 to 12

and

4 % for nuts of property classes 04 and 05.

Failure of a nut occurs when the wall of the nut breaks entirely before the minimum specified widening valueis obtained. In cases of doubt, the fracture may be recognized when the nut is cut on the opposite side andthen falls into two single parts.

5 Special case - Prevailing torque type nuts

For prevailing torque type nuts according to ISO 2320 the minimum value of widening shall be 20 ‘?XO below thevalues for hexagon nuts specified in 4.

t

2

IS 15569:2005

ISO 10484:1997

Tolerances in millimetres

0,03

+PI +E

u-l--

dhll

1) d k the nominal thread diameter of the nut. Forthe testing of oversize tapped nuts the dimension dshall be enlarged according to the major diameter ofthe internal thread.

2) m is the nominal height of the nut.

Figure 1 — Test mandrel for wideningof nuts up to 6 % (1,06 d)

or up to 4 % (1,04 d) respectively

Tolerances in millimetres

i/=11

IQ+’J’’)’”

1)F k the load.

2) Hardened.

3) d k the nominal thread diameter of the nut.

Figure 2 — Test assembly

3

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Users of Indian Standards should ascertain that they are in possession of the latest amendments or

edition by referring to the latest issue of ’61S Catalogue’ and ‘Standards: Monthly Additions’. I

This Indian Standard has been developed from Dot: No. MGP/BP 33 (0406).

1

1--J:

Amendments Issued Since Publication::

Amend No. Date of Issue Text Affectedi’

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