Source: https://id.scribd.com/document/153838481/IS-204-2-1992
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IS 204-2 1992 | Brass | Screw
Tower Bolts Specification- Part 2 Non Ferrous Materials
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TOWER BOLTS-SPECIFICATION
PART ( 2 NON-FERROUS METALS
Fifth Revision )
First Reprint OCTOBER 1994
621*882*2 [ 669*2/-S] : 624.97
ZAFAR MAR6
Price Gfoop 3
FOREWORD This Indian Standard (Fifth Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Builders Hardware Sectional Committee had been approved by the Civil Engineering Division Council. The specification for tower bolts was issued in 1950 and subsequently revised in 1961, 1966, 1974 and 1978. The standard was bifurcated into two parts in the fourth revision ( 1978 ); Part 1 deals with ferrous metal tower bolts and Part 2 deals with non-ferrous metal tower bolts. For the tower bolts made of non-ferrous metals, the length of bolt has been length of the barrel and the size is denoted by the length of the barrel. Also the diameter of the bore of the barrel and socket specified to suit the extrusions locally available. for the barrel kept equal to the has been
This revision of the standard makes reference to the latest Indian Standards for various types of materials specified herein. Consequently, it also indicates the designations for various materials as per the latest versions of these standards. This standard contains clauses 5.1.1, 6.3 and 7.1 which permit the purchaser for selection to suit his requirements. to use his option
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. 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 Rules for rounding off numerical values ( revised ). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
IS 204 ( Part 2 .) : 1992
TOWER BOLTS -SPECIFICATION
t MATERIAL 4.1 The material used for tower bolts shall comply with the requirements given in Table 3. S MANUFACTURE 5.1 General A Tower bolts shall be well made and shall be free from defects. The bolts shall be finished to the correct shape and shall have a smooth action. All tower bolts made with sheets l-2 mm thickness and above shall have countersunk .screw holes to suit countersunk head wood screw (see IS 6760 : 1972 ). All sharp edges and corners shall be removed and finished smooth. 5.1.1 Tower bolts, wherever possible, shall have knob integral with the bolt. In case it is not possible to provide a single piece construction of bolt, the knob may preferably be fitted to the bolt with a pin or alternatively, screwed and riveted to the bolt and its shape may be round, half round, spherical or conical, of robust construction as specified by the purchaser. 5.2 Particulars 1 5.2.1 Barrel Tower Bolts Barrel made from sheet shall be properly pressed to shape. Cast barrel shall be free from casting and other surface defects. Brass bolt Shall be made from rolled or drawn brass rod.Extruded sections of aluminium alloy and brass shall be free from defects. Non-ferrous metal tower bolts shall each be provided with a small spring and a ball on the inside of barrel to enable smooth working ( one typical illustration is shown in Table 1 ). 5.2.2 Skeleton Tower Bolts
1 SCOPE 1.1 The standard ( Part 2) lays down requirements for tower bolts made of non-ferrous metals. 2 REFERENCES 2.1 The Indian Standards listed in Annex are necessary adjuncts to this standard. 3 TYFES 3.1 Tower bolts shall be of the following ( see Tables 1 and 2 ):
TYPO Description
a) Barrel Tower Bolts
Brass barrel tower bolts with cast brass barrel and rolled or cast brass bolts Brass barrel tower bolts with barrel of extruded sections of brass and rolled or down brass Brass barrel tower bolts with brass sheet barrel and rolled or drawn brass bolt Aluminium barrel tower bolts with barrel and bolt of extruded sections of aluminium alloys Zinc barrel tower bolts with barrel and bolt of die-cast zinc alloy b) Skeleton Tower Bolts Brass skeleton tower bolts with cast brass plate and staples and rolled or drawn brass bolt Brass skeleton tower bolts with extruded staples and plate of sections of brass and rolled or drawn brass bolt Aluminium skeleton tower bolts with pla,e, staples and bolt of extruded sections of aluminium alloy Zinc skeleton tower bolts with.plate staples and bolts of die-cast zinc alloy
The staples and plate of non-ferrous metal shall be free from casting or other defects ( one typical illustration is shown in Table 2 ).
6 DIMENFIONS
6.1 The leading dimensions of barrel tower bolts and tolerances on them-shall conform to ,WQ those given in Table 1. 1
IS 201 ( Part 2 ) : 1992 Table 11 Barrel Tower Bolts, Types 1 to 5 ( Ciauses 3.1, 5.2.1 and 6.1 )
--__ ,$, OR in millimetres. B _.-___
E+Smm
i--Y-SPRING AND SALL
f-d-^..
Length of Bolt or Barrel (A or B)
Width of, Barrel, C .L. -_ When When DEIOO &=120
Ma of Bolt D
Thickness of Metal of Barre!, F T--~---_~ Brass Alumkium Alioy Sheet r-_-.-h-.-,T Brass Z:;c DclOXl LL12.0 Alloy
Dia of Bore of Barrel Soocrket
Minimum No. of Equally Spaced Holes in Barrel & S&cok;e; Screw No. 6
75 101,) 125 250 17.5 200 225 250 300
15 100 125 150 175 200 225 250 300
(7) I.5 1 1.5 I ;
6 6 6 8 1.60 240 1 to 1.23 0.7 to l-5 more than dia of bolt 8 8 8 10
2.0 f 32 38 104 or 12.0 25 2.0 1
2.0 I 2.0 1
_--9.3 --1 fl 4: :
._&I 4-0.5 -0.2
^__--9.25 gJ.25 ho.15 -
Tower Bolts, Types 6 to 9
( Clauses 3.1, 5.2.2 and 6.2 )
Size Length B%
Length B::, Pl;te
Width of Bolt Plate or Staple C ,=A--When
D=lO.O
Dia B::,
Da12.0
Length of Staple E ,~~~~~---When When
Thickness of Plate or Socket F
Brass When D=12.0
r--T 0=12-O When D=lO.O
Dia of Bore ~of Dia of Plate or Staple Shank of Knob Aluminium Alloy G or Zinc Alloy w~------h---~ When When When When c- --A-, When D=lO*O D=12-5 D=lO.O D=12.0 When DE10.0 D-12.0
Minimum No. of screw Holes for wood %z .
375 450 600 750 900 Tolerance
375 450 600 750 900
10.0 12.0 or
ito.5
&I-5
+_od25
+_;25
j-O.25
&O*s
+0*5 -0
IS204(Part2):1992 6.2 The leading dimensions of skeleton tower bolts and tolerances on them shall conform to those given in Table 2. 6.3 The tower bolts may be supplied iri sizes and dimensions and shapes other than those specified in relevant tables of dimensions and where so agreed between the manufacturer and the purchaser. 7 FINISH 7.1 Unless otherwise specified have finish as given below: a) Barrel Tower Bolts 1) Brass tobver bolts ( TvDes 1 to 3 > - Bolt and barrel polishkd*& plated as ipecified by the purchaser. the bolts shall 8 PACKING 8.1 Barrel tower bolts shall be suitably packed in cartons. Each carton shall bear a label showing the name of the manufacturer or trade-mark, type size and quantity of bolts. Aluminium tower bolts shall be individually wrapped with tissue paper or polythene film. 8.2 Skeleton tower bolts of non-ferrous metal shall be suitably packed and the aluminium alloy bolts shall be individually wrapped with tissue paper or polythene film. Each packet or carton shall bear a label shdwing the name of the manufacturer or trade-mark, type, size and quantity of tower bolts. 9 SCALE OF SAMPLING FOR CONFORMITY 9.1 Lot In any consignment, all the tower bolts, of the same type and manufactured at the same time, shall be grouped together to constitute a lot. 9.2 Sample Size The number of tower bolts, to be selected from a lot, shall depend upon the size of the lot and shall be in accordance with co1 1 and 2 of Table 4. 9.2.1 These tower bolts shall be selected at random from at least 10 percent of the packets subject to a minimum of three, equal number of tower bolts being selected from each such packet., 9.3 Tests All the tower bolts selected as in 9.2 shall be checked for dimensional requirements ( see 6 ) and for finish (see 7 ). Any tower bolt which fails to satisfy the requirements of dimensions or finish or both shall be considered as a defective bolt. AND CRITERIA
Aluminium alloy tower bolts ( Type 4 ) -
Bolts and barrel anodized. The anodic film may be either transparent or dyed as specified by the purchaser. The quality of anodized finish shall not be less than Grade AC 10 of IS 1868 : 1982.
3) Zinc alloy tower bolts ( Type 5 ) .- Bolt and barrel oxidized, bronzed or plated as specified by the purchaser. h) Skeleton Tower Bolts 1) Brass skeleton tower bolts (Types 6 and 7)-Bolt, plate and staples bright finished. 2) Aiuminium
Bolt, plate and staples anodized. The anodic film may be either transparent or dyed as specified by the purchaser. The quality of anodised finish shall not be less than Grade AC 10 of IS 1868 : 1982.
3) Zinc alloy skeleton toker bolts ( Type 9 )Bolt, plate and staples oxidized, bronzed or plated as specified by the purchaser.
Requirements for Materials for Tower Bolts ( Clauses 4.1 and 9.5 )
$1 No.
Material Aluminium Aluminium Brass shelts Cast brass Extruded brass Zinc base alloy die casting (2) alloy tubes alloy extruded
Suitable Grade in Indian Standards
(3) Designation 63400 WP or 63400 P of IS 1285 : 1975 Designation 65032 WP of IS 733 : 1983 Alloy designation CuZn 40 Condition HB of IS 410 : 1977 Grade CB-2 of IS 292 : 1983 Type II, Half hard condition of IS 319 : 1974 Alloy Zn A14, Die casting of IS 742 : 1981
IS204(Part2):1992 9.4 Criteria for Conformity Table 4 Scale of Sampling and Criterion for Conformity
A lot shall be considered as conforming to the requirements of this standard if the number of defective bolts among those inspected does not exceed the corresponding number given in co1 3 of Table 4; otherwise it shall be considered as not conforming to the requirements of this standard. to the requirements of the materials- the manufacturer shall provide a certificate of compliance to the requirements of corresponding Indian Standard ( see co1 4 in Table 3 ).
10 MARKING 10.1 Each tower bolt shall be clearly marked with the name of manufacturer or trade-mark. 10.1.1 The tower bolt may also be marked with the Standard Mark. 9.5 For conformity
( Clauses 9.2 and 9.4 ) Lot Size
Permissible Number of Defective
up to 200 201to 300
501to 800
LIST OF REFERRED STANDARDS IS No. 292 : 1983 Title IS No. Title
319 ; 1974 410 : 1981 733 : 1983
Leaded brass ingots and castings ( second revision ) Free-cutting brass, bars, rods and sections ( third revision ) Cold rolled brass sheet, ,strip and foil ( third revision ) aluminium Wrought and ahuninium alloy bars, rods, and sections ( for general engineering purposes ) ( third
742 : 1981 1285 : 1975
Zinc base alloy die castings
1868 : 1982
6760 : 1972
aluminium and Wrought aluminium alloy, extruded round tube and hollow sections general engineering ( for purposes ) ( second revision ) Anodic coatings on aluminium and its alloy ( second revision ) Slotted countersunk head wood screws
Bureau of Indian Standards BIS is a statutory institution established under the Bureau o/ Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to- conaeFted matters in the country. Copyright BIS has a copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications ), BIS. Review of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards.are also reviewed periodically; a standard along with amendments is reaffirmed when such a review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of BIS Handbook and Standards Monthly Addition. This Indian Standard has been developed from Dot : No. CED 15 ( 5013 ) Ameodmeats Issued Since Poblication Amend No. Date of Issue Text Affected
BUREAU OF INDIAN STANDARDS Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones : 3310131,33113 75 Regional Offices: Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002 Eastern : l/l4 C.I.T. Scheme VII M, V.I.P. Road, Maniktola CALCUTTA 700054 Northern : SC0 445-446, Sector 35-C, CHANDIGARH 160036 Telegrams : Manaksanstha ( Common to all Oflices ) Telephones 331.01 31 t 331 13 75 37 84 99, 37 85 61 37 86 26, 37 86 62 i 53 38 43, t 53 23 84 53 16 40
Southern : C.I.T. Campus, IV Cross Road, MADRAS 600113 Western : Manakalaya, E9 MIDC, Marol, Andheri ( East ) BOMBAY 430093
235 02 16, 235 04 42 t 235 15 19, 235 23 15 632 92 95, 632 78 58 632 78 91, 632 78 92
Branches : AHMADABAD. BANGALORE. BHOPAL. BHUBANESRWAR. CGIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. PATNA. THIRUVANANTHAPURAM. Reprography Unit, BIS, New Delhi, India
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NO. 2 OCTOBER 1997 TO IS 204 ( PART 2) : 1992 TOWER BOLTS SPECIFICATION
PART 2 NON-FERROUS ( Fifth Revision ) (P~ge2,TabZe1,Fig.)-Substh1te16~1mmfor16mm. (Page 2, Table 1 ) Insert a new figure as given below before last figure: METALS
(CED15)
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