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British Standard Specifications

British Standard Specifications B.S. 1768: 1951 and B.S. 1769: 1951.—Unified Precision Hexagon Bolts, Screws, Nuts (U.N.C. and U.N.F. Threads) and Plain Washers—Normal Series and Unified Black Hexagon Bolts, Screws, and Nuts and Plain Washers—Heavy Series. Copies of the following Specifications may be obtained from the BRITISH STANDARDS The publication of these two standards for Unified hexagon bolts, screws and nuts marks the most import­ INSTITUTION , Sales Department, 24 Victoria Street, London, S.W.I , at the prices indicated ant development to date in the work of standardiza­ tion between the three North Atlantic Treaty countries since the signing of the 1948 'Declaration of Accord'. It will now make possible really effective implementa­ B.S. 1730:1951.—Seamless Low Carbon and Carbon- particularly when they remain illuminated. British tion of the agreement to adopt the Unified screw Molybdenum Steel Furnace Tidies for the Petroleum Standard G.113, Electro-magnetic Indicators for Extra thread, the standard for which was published as Industry. Law Voltage Aircraft Systems, recently published B.S. 1580 in 1949. by the British Standards Institution, provides an B.S. 1731:1951.—Sea-nless Alloy Steel Furnace At an important conference between industrial and alternative in the form of a magnetic indicator which Tubes for the Petroleum Industry. service delegates from the United Kingdom, Canada can give a continued indication of the maintenance and the United States, held at the end of April under B.S. 1730 provides for one grade of low carbon and of a certain condition in a circuit without irritation the aegis of the British Standards Institution, agree­ one grade of carbon-molybdenum steel furnace tubes to the pilot. The standard applies to a single-pole or ment was reached in principle on the basic dimensions which have been based on the standard A.161 of the multi-pole indicator comprising a flag or shutter, of hexagon bolts, screws and nuts, and overall limits American Society for Testing Materials. operated electro-magnetically at a nominal voltage of were established for two scries, normal and heavy It contains full chemical analysis as well as 24 volts D.C , giving a visible signal appropriate to the series, based essentially on a selection from existing mechanical properties required of the tubes, together state of the electrical circuit to which it is connected. American standards. with tolerances and methods of test. Price 1s. post free. Apart from the military significance of this develop­ B.S. 1731 provides two grades of alloy steel furnace ment, it will lead to intcrchangeability of many B.S. M.23: 1951.—Identification Scheme for Aircraft tubes, one being a 2¼ per cent. chromium, 1 per cent. products in a wide range of engineering industries. Pipe-lines. molybdenum, and the other 5 per cent. chromium, ½ In particular, unofficial announcements from the per cent molybdenum steel, which have been based on This British Standard has been prepared at the motor industry on both sides of the Atlantic indicate the standard A.200 of the American Society for request of the Air Registration Board and approved that they intend to adopt the Unified standard for Testing Materials. for publication by the Aircraft Industry Standards their civilian as well as their armament production. It contains full chemical analysis as well as Committee for the purpose of providing a scheme to indicate, on an international basis, the function of a mechanical properties required of the tubes, together B.S. 1768 relates to the normal series of Unified pipe system in aircraft. Identification is provided by with tolerances and methods of test. precision hexagon bolts, screws and nuts having the combination of a written description of the main Price 2s. each, post free. Unified screw threads in a range of nominal sizes function of a line with one of a series of geometric from 1 in. to 1 in. inclusive. The tolerances prescribed symbols suitable for international use. The scheme, are those appropriate to engineering work where a B.S. 185, Pt. 3: 1951.—Glossary of Aeronautical which provides the minimum identification necessary good standard of dimensional accuracy and perform­ Terms. for normal maintenance, is independent of the use of ance is necessary. Dimensions and general require­ This is the concluding portion of the revision of the colour in order to avoid confusion with various ments are given for hexagon bolts and screws and Glossary of Aeronautical Terms of which Parts 1 and existing colour codes. Part I of the scheme provides a ordinary nuts, lock nuts, slotted nuts and thick slotted 2 have already been published. It has been much system of schematic identification of pipe-lines for nuts. Dimensions of plain washers are also included. extended in view of recent development and includes basic services in aircraft. Part II relates to the identi­ Formulae for the calculation of dimensions for bolt sections on navigation, parachutes, air traffic and fication of sub-divisions of those services. and screw heads and nuts in intermediate sizes and ground services, radio-communication and radio­ Price 2s. post free. sizes larger than 1 in. are given in an appendix and location and meteorology. It also contains a combined among other information given are items relating to index of the terms defined in all three parts. B.S. G.134: 1951.—Engine-driven D.C. Generators for the mechanical properties of finished steel hexagon Price Is. 6d. post free. Aircraft. head precision bolts and screws and hexagon nuts, and to the standard sizes of bolts which are most This British Standard applies to generators of B.S. 1755: 1951.—Glossary of Terms used in the likely to be stocked by manufacturers when the continuous rating up to 50 kw. for aircraft D.C. Plastics Industry. standard comes into general use. power supply and suitable for engine drive. The This is one of the documents in the scries which is generators covered by the standard are of the pipe being prepared to cover glossaries of terms used in B.S. 1769 relates to the Heavy scries of Unified ventilated type, taking air, for example, from the various industries, and it is hoped that it will provide hexagon bolts, screws and nuts in a range of nominal aircraft slipstream, and they are suitable for use for greater uniformity and precision in the use of sizes from i in. to 2 in. inclusive. The hexagon sizes either: terms. in this scries are larger in proportion to the nominal (a) up to such altitude as is declared by the manu­ The document is of considerable importance at this diameter of thread than those in the Normal series facturer, or juncture as it will form a basis for discussions on an and it is hoped that this standard may go far to meet (b) up to 20,000 ft. international level by Technical Committee 61— the needs of those who have felt the lack of the large Price 2s. post free. Plastics, of the International Organization for Whitworth hexagon, the standards for which were Standardization. withdrawn some years ago. Dimensions and general B.S. 1775: 1951.—Steel Tubes for Mechanical, The terms are grouped in Sections to cover: rcquiicmcnts are given for bolts, screws, ordinary Structural and General Engineering Purposes. Chemistry nuts, lock nuts and slotted nuts and dimensions of This new standard is the third of a series for steel Industrial applications plain washers are also included. The tolerances are tubes for general engineering purposes, the other two Constituents somewhat wider than those for the Normal scries, being B.S. 980, Steel Tubes for Automobile Purposes Properties but it is recognized that bolts and nuts of the Heavy and B.S. 1717, Steel Tubes for Cycle and Motor Cycle Moulding processes dimensions may be required with a higher grade of Purposes. Other manufacturing processes. finish for certain applications. Requirements are The standard covers plain carbon steel tubes not The terms listed in these Sections are fully defined. accordingly included in respect of bolts faced under exceeding 16 in. outside diameter, of the following Price 6s. post free. the head and machined on the shank and machined types. nuts. Formulae for the calculation of dimensions for Hot finished welded (referred to as type H.F.W.). bolt and screw heads and nuts in intermediate sizes B.S. G.135: 1951.—Electrically Heated Pilot and Hot finished seamless (referred to as type H.F.S.). Pitostatic Pressure Heads for Aircraft. and sizes larger than 2 in. are given in an appendix. Cold drawn seamless (referred to as type C.D.S.). In additon to specifying the requirements for Price is. and 2s. 6d. each respectively. Electric resistance butt-welded (referred to as type electrically heated pitot heads, this specification deals E.R.W). B.S. 1472: 1951.—Wrought Aluminium and Aluminium with two grades of pitotstatic heads, i.e. Cold drawn electric resistance butt-welded (referred Alloy Forgings (including hot pressings, hot stampings, Grade I—suitable for use at Mach numbers greater to as type C.E.W.). than 0·85. drop stampings and drop forgings) and B.S. 1477: Oxy-acctylene butt-welded (referred to as type Grade II—suitable for use at Mach numbers up to 195l.—Wrought Aluminium and Aluminium Alloy O.A.W.). 0-85. Plate. Tubes of types F.F.W., H.F.S., C.D.S and O.A.W. Price 1s. post free. The forgings standard includes seven alloys and are specified in four grades, viz. 11, 13, 15 and 20, the provides both for the forgings themselves and for the numbers indicating the minimum yield strength. Tubes B.S. G.136: 1951.—Extra-low Voltage D.C. Cyclic bar material for forgings. In addition to the require­ of type E.R.W. are similarly specified in Grades 11, 15 Switches for Aircraft. ments in regard to mechanical properties an appendix and 20, while those of type C.E.W. are specified in This covers the requirements for extra-low voltage gives notes for design purposes on the properties that Grades 11, 15, 24 and 28. D.C. electrically-operated switches, with contacts may be expected from test pieces cut from forgings Part One includes a number of general clauses operated in a cyclic manner for use on aircraft. The up to approximately 4 in. in diamater. applicable to all types of tubes, dealing with such specification docs not include switches used in radio, The plate standard covers three purities of alumin­ matters as material, straightness, lengths, galvanizing, electronic or telephonic apparatus. The switch contacts methods of test and inspection. Each type of tube is ium and six alloys. may be designed for use on any of the recognized then dealt with in detail in a separate section which Both specifications include clauses on mechanical aircraft supply systems. includes such items as tolerances and mechanical composition, condition and mechanical properties Price 1s. post free. properties. as well as general clauses covering freedom from At the end of the standard are tables of standard defects, tolerances, provision of clauses covering B.S. G.133: 1951.—Electro-magnetic Indicators for sizes of hot finished welded and hot finished seamless freedom from defects, tolerances, provision of test Extra Low Voltage Aircraft Systems. tubes. A further table gives the properties of the pieces and mechanical tests, and an appendix on heat Warning lights as indicators of the condition of tabulated sizes. treatment. aircraft electrical circuits tend to confuse the pilot, Price 3.?. post free. Price 4s. and 5s. each respectively post free. 56 Aircraft Engineering http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

British Standard Specifications

Aircraft Engineering and Aerospace Technology , Volume 24 (2): 1 – Feb 1, 1952

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Emerald Publishing
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Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb032134
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Abstract

B.S. 1768: 1951 and B.S. 1769: 1951.—Unified Precision Hexagon Bolts, Screws, Nuts (U.N.C. and U.N.F. Threads) and Plain Washers—Normal Series and Unified Black Hexagon Bolts, Screws, and Nuts and Plain Washers—Heavy Series. Copies of the following Specifications may be obtained from the BRITISH STANDARDS The publication of these two standards for Unified hexagon bolts, screws and nuts marks the most import­ INSTITUTION , Sales Department, 24 Victoria Street, London, S.W.I , at the prices indicated ant development to date in the work of standardiza­ tion between the three North Atlantic Treaty countries since the signing of the 1948 'Declaration of Accord'. It will now make possible really effective implementa­ B.S. 1730:1951.—Seamless Low Carbon and Carbon- particularly when they remain illuminated. British tion of the agreement to adopt the Unified screw Molybdenum Steel Furnace Tidies for the Petroleum Standard G.113, Electro-magnetic Indicators for Extra thread, the standard for which was published as Industry. Law Voltage Aircraft Systems, recently published B.S. 1580 in 1949. by the British Standards Institution, provides an B.S. 1731:1951.—Sea-nless Alloy Steel Furnace At an important conference between industrial and alternative in the form of a magnetic indicator which Tubes for the Petroleum Industry. service delegates from the United Kingdom, Canada can give a continued indication of the maintenance and the United States, held at the end of April under B.S. 1730 provides for one grade of low carbon and of a certain condition in a circuit without irritation the aegis of the British Standards Institution, agree­ one grade of carbon-molybdenum steel furnace tubes to the pilot. The standard applies to a single-pole or ment was reached in principle on the basic dimensions which have been based on the standard A.161 of the multi-pole indicator comprising a flag or shutter, of hexagon bolts, screws and nuts, and overall limits American Society for Testing Materials. operated electro-magnetically at a nominal voltage of were established for two scries, normal and heavy It contains full chemical analysis as well as 24 volts D.C , giving a visible signal appropriate to the series, based essentially on a selection from existing mechanical properties required of the tubes, together state of the electrical circuit to which it is connected. American standards. with tolerances and methods of test. Price 1s. post free. Apart from the military significance of this develop­ B.S. 1731 provides two grades of alloy steel furnace ment, it will lead to intcrchangeability of many B.S. M.23: 1951.—Identification Scheme for Aircraft tubes, one being a 2¼ per cent. chromium, 1 per cent. products in a wide range of engineering industries. Pipe-lines. molybdenum, and the other 5 per cent. chromium, ½ In particular, unofficial announcements from the per cent molybdenum steel, which have been based on This British Standard has been prepared at the motor industry on both sides of the Atlantic indicate the standard A.200 of the American Society for request of the Air Registration Board and approved that they intend to adopt the Unified standard for Testing Materials. for publication by the Aircraft Industry Standards their civilian as well as their armament production. It contains full chemical analysis as well as Committee for the purpose of providing a scheme to indicate, on an international basis, the function of a mechanical properties required of the tubes, together B.S. 1768 relates to the normal series of Unified pipe system in aircraft. Identification is provided by with tolerances and methods of test. precision hexagon bolts, screws and nuts having the combination of a written description of the main Price 2s. each, post free. Unified screw threads in a range of nominal sizes function of a line with one of a series of geometric from 1 in. to 1 in. inclusive. The tolerances prescribed symbols suitable for international use. The scheme, are those appropriate to engineering work where a B.S. 185, Pt. 3: 1951.—Glossary of Aeronautical which provides the minimum identification necessary good standard of dimensional accuracy and perform­ Terms. for normal maintenance, is independent of the use of ance is necessary. Dimensions and general require­ This is the concluding portion of the revision of the colour in order to avoid confusion with various ments are given for hexagon bolts and screws and Glossary of Aeronautical Terms of which Parts 1 and existing colour codes. Part I of the scheme provides a ordinary nuts, lock nuts, slotted nuts and thick slotted 2 have already been published. It has been much system of schematic identification of pipe-lines for nuts. Dimensions of plain washers are also included. extended in view of recent development and includes basic services in aircraft. Part II relates to the identi­ Formulae for the calculation of dimensions for bolt sections on navigation, parachutes, air traffic and fication of sub-divisions of those services. and screw heads and nuts in intermediate sizes and ground services, radio-communication and radio­ Price 2s. post free. sizes larger than 1 in. are given in an appendix and location and meteorology. It also contains a combined among other information given are items relating to index of the terms defined in all three parts. B.S. G.134: 1951.—Engine-driven D.C. Generators for the mechanical properties of finished steel hexagon Price Is. 6d. post free. Aircraft. head precision bolts and screws and hexagon nuts, and to the standard sizes of bolts which are most This British Standard applies to generators of B.S. 1755: 1951.—Glossary of Terms used in the likely to be stocked by manufacturers when the continuous rating up to 50 kw. for aircraft D.C. Plastics Industry. standard comes into general use. power supply and suitable for engine drive. The This is one of the documents in the scries which is generators covered by the standard are of the pipe being prepared to cover glossaries of terms used in B.S. 1769 relates to the Heavy scries of Unified ventilated type, taking air, for example, from the various industries, and it is hoped that it will provide hexagon bolts, screws and nuts in a range of nominal aircraft slipstream, and they are suitable for use for greater uniformity and precision in the use of sizes from i in. to 2 in. inclusive. The hexagon sizes either: terms. in this scries are larger in proportion to the nominal (a) up to such altitude as is declared by the manu­ The document is of considerable importance at this diameter of thread than those in the Normal series facturer, or juncture as it will form a basis for discussions on an and it is hoped that this standard may go far to meet (b) up to 20,000 ft. international level by Technical Committee 61— the needs of those who have felt the lack of the large Price 2s. post free. Plastics, of the International Organization for Whitworth hexagon, the standards for which were Standardization. withdrawn some years ago. Dimensions and general B.S. 1775: 1951.—Steel Tubes for Mechanical, The terms are grouped in Sections to cover: rcquiicmcnts are given for bolts, screws, ordinary Structural and General Engineering Purposes. Chemistry nuts, lock nuts and slotted nuts and dimensions of This new standard is the third of a series for steel Industrial applications plain washers are also included. The tolerances are tubes for general engineering purposes, the other two Constituents somewhat wider than those for the Normal scries, being B.S. 980, Steel Tubes for Automobile Purposes Properties but it is recognized that bolts and nuts of the Heavy and B.S. 1717, Steel Tubes for Cycle and Motor Cycle Moulding processes dimensions may be required with a higher grade of Purposes. Other manufacturing processes. finish for certain applications. Requirements are The standard covers plain carbon steel tubes not The terms listed in these Sections are fully defined. accordingly included in respect of bolts faced under exceeding 16 in. outside diameter, of the following Price 6s. post free. the head and machined on the shank and machined types. nuts. Formulae for the calculation of dimensions for Hot finished welded (referred to as type H.F.W.). bolt and screw heads and nuts in intermediate sizes B.S. G.135: 1951.—Electrically Heated Pilot and Hot finished seamless (referred to as type H.F.S.). Pitostatic Pressure Heads for Aircraft. and sizes larger than 2 in. are given in an appendix. Cold drawn seamless (referred to as type C.D.S.). In additon to specifying the requirements for Price is. and 2s. 6d. each respectively. Electric resistance butt-welded (referred to as type electrically heated pitot heads, this specification deals E.R.W). B.S. 1472: 1951.—Wrought Aluminium and Aluminium with two grades of pitotstatic heads, i.e. Cold drawn electric resistance butt-welded (referred Alloy Forgings (including hot pressings, hot stampings, Grade I—suitable for use at Mach numbers greater to as type C.E.W.). than 0·85. drop stampings and drop forgings) and B.S. 1477: Oxy-acctylene butt-welded (referred to as type Grade II—suitable for use at Mach numbers up to 195l.—Wrought Aluminium and Aluminium Alloy O.A.W.). 0-85. Plate. Tubes of types F.F.W., H.F.S., C.D.S and O.A.W. Price 1s. post free. The forgings standard includes seven alloys and are specified in four grades, viz. 11, 13, 15 and 20, the provides both for the forgings themselves and for the numbers indicating the minimum yield strength. Tubes B.S. G.136: 1951.—Extra-low Voltage D.C. Cyclic bar material for forgings. In addition to the require­ of type E.R.W. are similarly specified in Grades 11, 15 Switches for Aircraft. ments in regard to mechanical properties an appendix and 20, while those of type C.E.W. are specified in This covers the requirements for extra-low voltage gives notes for design purposes on the properties that Grades 11, 15, 24 and 28. D.C. electrically-operated switches, with contacts may be expected from test pieces cut from forgings Part One includes a number of general clauses operated in a cyclic manner for use on aircraft. The up to approximately 4 in. in diamater. applicable to all types of tubes, dealing with such specification docs not include switches used in radio, The plate standard covers three purities of alumin­ matters as material, straightness, lengths, galvanizing, electronic or telephonic apparatus. The switch contacts methods of test and inspection. Each type of tube is ium and six alloys. may be designed for use on any of the recognized then dealt with in detail in a separate section which Both specifications include clauses on mechanical aircraft supply systems. includes such items as tolerances and mechanical composition, condition and mechanical properties Price 1s. post free. properties. as well as general clauses covering freedom from At the end of the standard are tables of standard defects, tolerances, provision of clauses covering B.S. G.133: 1951.—Electro-magnetic Indicators for sizes of hot finished welded and hot finished seamless freedom from defects, tolerances, provision of test Extra Low Voltage Aircraft Systems. tubes. A further table gives the properties of the pieces and mechanical tests, and an appendix on heat Warning lights as indicators of the condition of tabulated sizes. treatment. aircraft electrical circuits tend to confuse the pilot, Price 3.?. post free. Price 4s. and 5s. each respectively post free. 56 Aircraft Engineering

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Feb 1, 1952

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