( Reaffirmed 2005 )

1s :_3761 - 1983

Indian Standard
SPECIFICATION FOR METAL SIDE RACKS ( ADJUSTABLE TYPE )

( First Revision )
Furniture Sectional Committee, BDC 35
Chairman SHRI A. BHARADWAJ 207, Golf Links, New Delhi Members SHRI A. M. CEL4KI SHRI R. S. DU~~AL Representing Cabinet Makers' and Furnishers' Association, Calcutta Engineer-inChret% Branch, Army Headquarters, New Delhi

Calcutta

SHRI S. C. GARQ ( Alternate ) Godrej & Boyce Manufacturing Co Ltd, Bombay SHRI 1. P. FIGUERIXDO SHRIH. H. JAMSHBDJ~ ( Alternate ) Cen;~~rktiiding Research Institute ( CSIR ), SHRI T. N. GUFTA SHRI V. K. A~~ARWAL ( Alternate ) Dire&~~;e~enerai SHRI D. B. JAIN SHIU 0. D. SANGEX ( AIternate ) Mini$fm DR M. L. M~HTA of Supplies and Disposals, Welfare, New

of Education & Social

SHRI P. N. MATHUR ( Alternate ) National Institute of Design, Ahmadabad Smu J. A. PANCHAL SHIU H. K. Vans ( Alternate ) Chandan Metal Products Pvt Ltd, Vadodara SHIU ASHOKC. PATEL SHIU ARUN C. PATBL( Alternate ) Indian Institute of Architects, Bombay SHIV P. RAJA~OPALAN Small Industries Serv@e Institute, New Delhi REPR~ENTATIVB Fore;LnResearch lnstttute and Colleges, Debra SHRI S. N. SAM-Al. Central Public Works Department, New Deim Smu M. B. SAXENA ARCHITIXT ( NZ ) VIII ( Alternate ) The Indian Plywood Manufacturing-Co Ltd, New COL G. B. SINGH Delhi DR A. PIJRUSHOTHAM ( Alternate ) ( Continued on page 2 )
@J

Copyright 1984 INSTITUTION

INDIAN

STANDARDS

mjs publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 3761 - 1983
( Continued from page 1 ) Members SHRI P. B. SHETH
SHRI B. L. SHETH (

Representing
Ahmedabad Eagle Engineering Ltd, Ahmadabad Enterprises Pvt

SHRI L. G. TOYB

Alternate )

SHRI V. K. PUNJ ( Alternate ) SHRI N. VENKATARAMAN

Research, Design and Standards Organization ( Ministry of Railways ), Lucknow The Western India Plywoods Cannanore ( Kerala ) Ltd, Distt

SHRI G. RAMAN,

SHRI N. E. GOVINDAN ( Alternate ) Director General, ISI ( Ex-officio Member ) Director ( Civ Engg )

Assistant Director ( Civ Engg ), ISI

Secrelary SHRI A. K. AVASTHY

Metal Furniture Subcommittee,
Convener
SHIU J. A. PANCHAL

BDC 35 : 1

National Institute of Deuxign,Ahmadabad

Members SHRI H. K. VYAS ( Alternate to Shri J. A. Panchal )

SHRI J. K. AGQARWAL

Engineer-in-Chief's New Delhi

Branch,

Army

Headquarters,

SHRI ATMA RAM BEHKI

SHRI M. N. KHULLAR ( SHRI V. K. AGRAWAL

Alternate )

SHRI SHIV KUMAR KAPAHI ( Ahrnate ) Godrcj & Boyce Manufacturing Co Pvt Ltd, SHRI I. P. FIGUEREDO Bombay SHRI H. H. JAMSHEDJI ( Alternate ) Featherlite Corporation, Bangalore SHRI GOPAL RAMNARAYAN SHRI BALDEV RAMNARAYAN( AJternate ) Directorate General of Supplies and Disposals, SHRI D. B. JAIN New Delhi The Director of Industries and Commerce, JOINT DIRECTOROF INDUSTRIES ( Government of Tamil Nadu ), Madras AND COMMERCE( RP ) DEPUTY DIRECTOR OF INDUS~IIX~ AND COMMERCE ( L C ) ( Alternate ) Chandan Metal Products Pvt Ltd, Vadodara SHRI ASHOK C. PATEL SHM ARUN C. PATEL ( Alternute )

Hindustan Aluminium Corporation Ltd, Bombay The Small Scale Steel Furniture Manufacturers' Association ( Regd ), New Delhi

2

IS : 3761- 1983

Indian Standard
SPECIFICATION FOR METAL SIDE RACKS ( ADJUSTABLE TYPE )

( First Revision )
O.FOREWORD
0.1 This Indian Standard ( First Revision ) was adopted by the Jndian Standards Institution on 30 December 1983, after the draft finalized by the Furniture Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 Sheet metal furniture is being made in the country for over a number of years. However, the sizes, finish and function of furniture items as made by various manufacturers require to be co-ordinated. This standard was, therefore, first prepared in 1966 to rationalize the sizes aod to specify the finishes consistent with corrosion protection. In this revision the grade of materials to be used in the components have been incorporated. 0.3 This standard contains clauses which require the purchaser to supply certain technical information at the time of placing order ( see 8 ). 0.4 In the formulation of this standard due weightage has been given to international co-ordination -among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. 0.5 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2 - 1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
1. SCOPE i.1 This standard lays down

the requirements

for metal side, ra~ek%
.:";,..,"` `. z .`.

`/

. *Rules fdr rounding off numerical values [ revised 1,'

3

IS : 3751 - 1983 2. MATERIALS 2.1 Mild Steel Sheet - Mild steel sheet shall IS : 1079-1973* or grade 0 of IS : 513-1973t.

conform

to grade 0 of

2.2 Mild Steel Angle - Mild steel for hot rolled angle section shall conform to IS : 226-1975$. Hot rolled mild steel angles shall conform to TS : 808-1964s. Angle sections may also be cold formed from strip steel conforming to grade 0 of IS : 4030-197311. 2.3 Bolts - The bolts used for assembly of side racks shall be M6 ( 6 mm in diameter > and the thickness of the square nut shall be 6 mm. 2.4 Wood Particle Boards FPTH of IS : 3087-1965lT. Wood particle boards shall conform particle conform boards to to type

2.5 Veneered Particle Boards - Veneered to type EX SO GP of IS : 3097-1980**. 2.6 Blockhoards IS : 1659-197977. Blockboards shall

shall confornl Grade 2 of

2.7 PI-ywood - Plywood shall conform to grade BWR and type BB of IS : 303-1975$$. 3. DIMENSIONS 3.1 Dimensions
-

AND TOLERANCES The overall dimensions of side racks shall be as below: 710 mm or height of table 900 mm 375 mm

Height Width Depth

3.1.1 The side racks shall have three shelves: the top shelf shall be flush with the top of the angle posts qnd, therefore, the first hole shall be appropriately located. The bottom shelf shall be fixed at the second hole from the bottom.
iSpeciflcatinn forxold rolled &rbeh St&l she&s ( se&ondrevisioti ). `lSpecificati6n for structufal steel ( stafldard qtiality ) ( fifrh revisibk ). @pecKcation for rolled steel heam, cliannel and single sections (first revision ). (Idpecificatlan for cold rolled carbofl st&l striP for general engineering p&poses (first rhvisior) ). lPpecificatian for wood particle boards ( niedium density ) far general pu&o$es. **Specification for veneered particle boards ( first revision ). ttSpecification for blockboards ( s~ond revisioa ). QSPecification for plywood for general Putposes ( second rtvisjon ).

*Specificationfdr hot rolled carbon steel sh&etand sttip ( thirdrevision ).

4

IS : 3761- 1983 3.2 Tolerances than & 5 mm. The dimensions specified in 3.1 shall not vary by more

4. FABRICATION 4.1 Components - Metal side racks shall be assembled from the following components as given in 4.2 to 4.4. 4.2 Angle Posts - The length of angle posts shall correspond to height of rack. The thickness of post when made from sheet shall be not less than 3:O mm. Rolled steel angle posts shall be of 40 x40 x 3 size. Angle posts shall be free from twist, sharp edges and burrs. 4.2.1 Holes in Angle Posts - Angle posts shall have 8 mm diameter holes provided at 50-mm centres. 4.3 Shelves - Shelves shall be made from mild steel sheets not less than 1`0 mm in thickness. Shelves shall have lipped flanges, width of flange being 30 mm and depth of lip 15 mm. The size of shelves shall be derived from the dimensions of racks given in 3.1 and the thickness of angles and guYsets where used. 4.3.1 Holes in Shelves - Shelves shall have 8 mm corresponding holes for fixing them to angle posts. In addition, shelves shall have &mm holes for corner gussets. 4.3.2 Wood based panel shelf is made from wood particle board or veneered particle board, or blockboard or plywood not less than 20 mm in thickness with four brackets fixed on the ends and sides near the corners ( see Fig. 1 ). The brackets shall be made of mild steel sheeting not less than 1'6 mm thick and shall have 8-mm corresponding holes for fixing them to the angle posts. The wood based panel shelf may have additional 8-mm holes and fixures, if required. 4.4 Gussets - Eight gussets, four on each face of the rack shall be fitted. Gussets shall be made of 1'0 mm minimum thick mild steel sheet and shall be not less than 75 mm long at each end joining to theshelf and the angle post. 5. ASSEMBLY 5.1 The various components 4. FINISH 6.1 All dents, burrs and sharp edges shall be removed from the various components. The components shall be individually pickled, scrubbed and rinsed to remove grease, rust, scale or any other foreign element.
. 5

,

shall be assembled by means of bolting.

IS : 3761- 1983

----- --- v VI-A

V

I
I

II ;/
0

+

i

Y

\r

ANGLE

POST

I

40X40X3

------_--__-- 1

\3x h

BRACKET

THICK 3ASED PANEL SHELF

'

--

BRACKET .

`AA11 diminsicfns in mitiitnetres.

FIG. 1

ARKANGEXJENT FOR ~ING~P~~~UODBASEDPANEL
6

SHELVES

ts : 3761 - 1983 6.2 Immediately after pickling all the mild steel parts shall be given phosphating treatment conforming to Class C of IS : 3618-1966l. The process for application of phosphate coating shall be in accordance with IS : 6005-1970'.
NOTE-Putty shall be applied to all the surfaces requiring filling and shall conform to IS : 110-1968s. Aluminium primer shall conform to IS : 5660-1970'.

6.3 Coat/coats of enamel paint shall then be applied~as follows: conforming to IS : 151-19506, enamels Finish coat with IS : 2932-19746 or IS : 2933-1975'. 6.3.1 The finish shall be smooth, uniformly applied and free from visible defects. It shall not readily chip or flake. The dry film thickness shall be not less than 0'10 mm. 6.4 All other components shall be finished in colour as agreed to between the purchaser and the supplier. 6.5 Wood Based Panel Components 6.5.1 Wood putty conforming to IS : 419-1967" shall be applied to all wood based surfaces requiring filling, followed by a coat of suitable primer paint, before the finishing coat o! paint is applied. 6.5.2 Wood based panels may be finished either with transparent gloss french polish or stained dark and polished ( see also IS : 2338 ( Part 1 ) 1967". 7. PERFORMANCE REQUIREMENTS OF FlNISH 7.1 Scratch Hardness Test - A sample of mild steel plate 150 x 50 mm in size and thickness 0'315 mm and finished as given in 6 shall be subjected to scratch hardness test in accordance with 15.1 of IS : 101:196410. A scratch showing the bare metal shall not be produced on the test sample. 7.2 Pressure Test - Samples prepared from mild steel plates of thickness of 0'3 15 mm and finished as given in 6 shall be subjected to pressure test in accordance with 15.2 of IS : 101-196410. The metal surface shall not be rendered visible when the test pieces are separated after the test.
1Specitication for phosphate treatment of iron and steel for protection against corrosion. aCode of practice for phosphating of iron and steel. Vpecification for ready mixed paint, brushing, grey filler for enamzis, for use over primers (first revision ). Gpecification for ready mixed paint, brushing, aluminium red oxide primer. Gpecification for ready mixed paint, spraying, finishing, stoving, enamel, for general purposes, colour as requned. @Specification for enamel, synthetic, exterior (a) undercoating (b) finishing (first revision ). QpecificJtion for enamel. exterior (a) undercoating (b) finishing (first revision ). sSpecificatton for putty for use on window frames (first revision ). aCode of practice for finishing of wood and wood based materials : Part 1 Operation and workmanship. loMethods of test for ready mixed paints and enamels ( second revision ).

7

IS: 3?61-1983 7.3Flexibility
and Adhesion Test - A sample of mild steel plate 150 x 50 mm in size and thickness 0'315 mm and finished as given in 6 shall be subjected to flexibility and adhesion test in accordance with 16 of IS : IOl-1964*. The paint film on the test piece shall not show damage, detachment or cracking when examined under x 10 magnification.

7.4 Stripping Test - A sample of mild steel plate 150 x 50 mm in size and thickness 0'3 15 mm and finished as given in 6 shall be subjected to stripping test in accordance with 17 of IS : 101-1964*. The scratch produced after the test shali be free from jagged edges. 7.5 Test for Protection Against Corrosion Under Conditions of Condeasation - A mild steel panel of size 15U X 100 mm and thickness 1'25 mm and finished as given in 6 shall be subjected to test for protection against corrosion under conditions of condensation in accordance with 18 of IS : lOl-1964*. A metal surface shall show no signs of corrosion after the test. 8. INFORMATION TO BE SUPPLIED BY THE PURCHASER $.l The purchaser shall supply the following information to the supplier along with the order: a) Colour and finish; and b) Where alternate method of construction and finish are specified, they shall be clearly stated in the order. 9. PACKING 9.1 All the component parts shall be packed in such a way that no damage is caused to them during transit. 10. MARKING

10.1 All steel racks shail be marked with a suitable mark identifying
manufacturer.

the

10.1.1 The steel racks may also be marked with the ISI CertiEcation Mark NOTE-- The use of the IS1 Certification Mark is governed by the provisions of
the Indian Standards lnstitution ( Certification Marks ) Act and the Rules and The 1SI Mark on products covered by an Indian Regulations made thereunder. Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-detined system of inspection, testing and quality control which IS devised and supervised by ISI and Qperated by the producer. ISI marked products are also continuously checked by IS1 for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors,may be obtained from the Indian Standards Institution. *Methods of test for ready mixed paints and enamels ( secondrevision ).

8