1、BSI Standards PublicationBS 4190:2014ISO metric black hexagonbolts, screws and nuts SpecificationPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2014Published by BSI Standards Limite
2、d 2014ISBN 978 0 580 83040 2ICS 21.060.10; 21.060.2The following BSI references relate to the work on this document:Committee reference FME/9Draft for comment 14/30283394 DCPublication historyFirst edition October 1967Second edition February 2001Third edition October 2014Amendments issued since publ
3、icationDate Text affectedBS 4190:2014 BRITISH STANDARD0ContentsForeword iii1 Scope 12 Normative references 13 Information and requirements to be agreed and documented 24 General dimensions 35 Length of bolts and screws 36 Ends of bolts and screws 47 Screw threads 58 Length of thread on bolts and scr
4、ews 59 Dimensions of bolts and screws 610 Dimensions of nuts 1111 Chamfering and facing 1312 Diameter of shank of bolt 1413 Drilled bolts and split pin holes 1414 Material and manufacture of steel bolts and screws 1515 Mechanical properties of bolts and screws 1516 Strength grade designation system
5、for steel nuts 1517 Material and manufacture of steel nuts 1518 Mechanical properties of steel nuts (excluding thin nuts) 1619 Marking and identification 1620 Finishes 1621 Inspection and testing 17AnnexesAnnex A (normative) Testing of mechanical properties of steel nuts 22Annex B (normative) Basic
6、dimensions for sizes greater than 68 mmdiameter 23Annex C (informative) Manufacturers recommended range of sizes 24Annex D (informative) Strength grade designation system for steel bolts andscrews 26Bibliography 27List of figuresFigure 1 Rounded end 4Figure 2 Rolled thread end 4Figure 3 Hexagon head
7、 bolt 7Figure 4 Hexagon head screw 7Figure 5 Alternative types of normal thickness nut 11Figure 6 Thin nut 11Figure 7 Head chamfering 13Figure A.1 Proof load test for nut 22Figure B.1 Sizes greater than 68 mm diameter 24List of tablesTable 1 Tolerance on nominal lengths of bolts and screws 4Table 2
8、Thread tolerance classes 5Table 3 Thread lengths 5Table 4 Thread runout (bolts) and underhead distance (screws) 6Table 5 Dimensions of ISO metric black hexagon head bolts and screws 8Table 6 Dimensions of ISO metric hexagon head bolts and screws faced underhead or faced under head and turned on shan
9、k 10Table 7 Dimensions of ISO metric hexagon nuts and hexagon thin nuts 12BRITISH STANDARD BS 4190:2014 The British Standards Institution 2014 null iTable 8 Split pin holes 14Table 9 Strength grade designations for steel nuts 15Table 10 Recommended bolt and nut combinations 15Table 11 Nut marking 16
10、Table 12 Product categories 17Table 13a Standard nominal lengths and preferred sizes of ISO metric blackhexagon bolts and screws (12 to 180 l) 18Table 13b Standard nominal lengths and preferred sizes of ISO metric blackhexagon bolts and screws (200 to 500 l) 19Table 14 Mechanical properties of steel
11、 nuts 20Table 15 Chemical composition of steel nuts 20Table 16 Proof loads for steel nuts (coarse pitch series) 21Table B.1 Sizes greater than 68 mm diameter 23Table C.1 Hexagon head bolts 24Table C.2 Hexagon head screws 25Table D.1 Strength grade designations of steel bolts and screws 26Summary of
12、pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 28, an inside back cover and a back cover.BRITISH STANDARDBS 4190:2014ii null The British Standards Institution 2014ForewordPublishing informationThis British Standard is published by BSI Standards Limited, u
13、nder licence fromThe British Standards Institution, and came into effect on 31 October 2014. Itwas prepared by Technical Committee FME/9, Nuts and accessories. A list oforganizations represented on this committee can be obtained on request to itssecretary.SupersessionThis British Standards supersede
14、s BS 4190:2001, which is withdrawn.Relationship with other publicationsThis British Standard should be read in conjunction with BS EN ISO 898-1 as itcontains tables that reflect up-to-date best practice for mechanical properties ofbolts.Information about this documentThe mechanical properties of the
15、 nuts in this British Standard do not conform toBS EN ISO 898-2. Higher proof load values have been allocated to the revisedproperty classes in BS EN ISO 898-2 in order to ensure that fracture of the boltgenerally occurs in the case of overloading.CAUTION. Nuts in accordance with this standard canno
16、t be fully loaded withsufficient assurance up to the yield point of the appropriate bolt, or beyondthis, without the possibility of the nut thread being stripped, and for thisreason it is essential that new designs of nuts for use with BS 4190 bolts andstuds conforming to this standard conform to BS
17、 EN ISO 898-2.In order to differentiate nuts that conform to this British standard from thatthose that conform to BS EN ISO 898-2 vertical bars have been added to thesymbols for strength grade designations e.g. |8| instead of 8.It has been assumed in the preparation of this British Standard that the
18、execution of its provisions will be entrusted to appropriately qualified andexperienced people, for whose use it has been produced.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal a
19、uxiliary verb is“shall”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Requirements in this standard are drafted in accordance with Rules for thestructure and drafting of UK standards, subclause J.1.1, which st
20、ates,“Requirements should be expressed using wording such as: When tested asdescribed in Annex A, the product shall .”. This means that only those productsthat are capable of passing the specified test will be deemed to conform to thisstandard.Contractual and legal considerationsThis publication doe
21、s not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 4190:2014 The British Standards Institution 2014 null iiiBRITISH STANDARDBS 4190:2
22、014This page deliberately left blankiv null The British Standards Institution 20141 ScopeThis standard gives the general dimensions and tolerances of black hexagonbolts, screws and nuts with ISO metric threads in diameters from 5 mm to68 mm inclusive; basic dimensions for sizes greater than M68 are
23、also included.This standard specifies mechanical properties of black hexagon bolts, screws andnuts made of carbon steel and alloy steel when tested at an ambienttemperature range of 10 C to 35 C. Dimensional requirements are included forbolts, screws and nuts finished black all over and for those wh
24、ich have partiallymachined finishes.NOTE 1 Fasteners (the term used when bolts, screws and nuts are considered alltogether) that conform to the requirements of this standard are evaluated at thisambient temperature range. They might not retain the specified mechanical andphysical properties at eleva
25、ted temperatures and/or lower temperatures.This standard is not applicable to fasteners used in applications outside of therange -50 C to +150 C.NOTE 2 Fasteners conforming to the requirements of this standard are used inapplications ranging from -50 C to +150 C. The use of fasteners in applications
26、outside of this range, and up to a maximum temperature of +300 C, might need tobe based on the advice of an experienced fastener metallurgist for determiningappropriate choices for a given application.NOTE 3 Nuts in accordance with this standard cannot be fully loaded with sufficientassurance up to
27、the yield point of the appropriate bolt, or beyond this, without thepossibility of the nut thread being stripped, and for this reason it is essential thatnew designs of nuts for use with BS 4190 bolts and studs conforming to thisstandard conform to BS EN ISO 898-2.NOTE 4 Nuts with an effective heigh
28、t of less than 0.6d and/or with a width acrossflats or outside diameter of less than 1.4d are excluded from the mechanicalrequirements specified.The dimensional requirements of this British Standard are also applicable tonon-ferrous and stainless steel bolts, screws and nuts.Information on strength
29、grade designation system for steel bolts and screws canbe found in Annex D.NOTE 5 The term “black” does not necessarily relate to the appearance of theproducts, as these can be of bright appearance or black in the finished state. Theterm implies the comparatively wider tolerances to which these prod
30、ucts are usuallymade.NOTE 6 In addition to the definitive requirements, this standard also requires theitems detailed in Clause 3 to be documented. For compliance with this standard,both the definitive requirements and the documented items have to be met.2 Normative referencesThe following documents
31、, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS 1916-1, Limits and fits for eng
32、ineering Part 1: Guide to limits and tolerancesBS 3643-1, ISO metric screw threads Part 1: Principles and basic dataBS 3643-2, ISO metric screw threads Part 2: Specification for selected limits ofsizeBS 7371-6, Coatings on metal fasteners Part 6: Specification for hot dippedgalvanized coatingsBRITIS
33、H STANDARD BS 4190:2014 The British Standards Institution 2014 null 1BS EN ISO 4042, Fasteners Electroplated coatingsBS EN ISO 10684, Fasteners Hot dip galvanized coatingsBS EN ISO 898-1:2013, Mechanical properties of fasteners made of carbon steeland alloy steel Bolts, screws and studs with specifi
34、ed property classes Part 1:Coarse thread and fine pitch threadBS EN ISO 1234, Split pinsBS EN ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test methodBS EN ISO 6506-2, Metallic materials Brinell hardness test Part 2: Verificationand calibration of testing machinesBS EN ISO 6506-3, Me
35、tallic materials Brinell hardness test Part 3: Calibrationof reference blocksBS EN ISO 6506-4, Metallic materials Brinell hardness test Part 4: Table ofhardness valuesBS EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodBS EN ISO 6507-2, Metallic materials Vickers hardness t
36、est Part 2: Verificationand calibration of testing machinesBS EN ISO 6507-3, Metallic materials Vickers hardness test Part 3: Calibrationof reference blocksBS EN ISO 6507-4, Metallic materials Vickers hardness test Part 4: Tables ofhardness valuesBS EN ISO 6508-1, Metallic materials Rockwell hardnes
37、s test Part 1: Testmethod (scales A, B, C, D, E, F, G, H, K, N, T)BS EN ISO 6508-2, Metallic materials Rockwell hardness test Part 2:Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N,T)BS EN ISO 6508-3, Metallic materials Rockwell hardness test Part 3:Calibration
38、and reference blocks (scales A, B, C, D, E, F, G, H, K, N, T)BS ISO 965-5, ISO general purpose metric screw threads Part 5: Tolerances.Limits of sizes for internal screw threads to mate with hot-dip galvanizedexternal screw threads with maximum size of tolerance position h beforegalvanizing3 Informa
39、tion and requirements to be agreed anddocumented3.1 Information to be supplied by the purchaserThe following information to be supplied by the purchaser shall be fullydocumented:a) general product description, e.g. “Black bolts”, “Screws faced under headonly”, “Black nuts”, etc. as appropriate, in a
40、ccordance with Table 12;b) the letter “M” indicating that the product is ISO metric;c) the nominal size (thread diameter) of the product in millimetres;d) the nominal length in millimetres - this applies only to bolts and screws;e) the number of this British Standard, i.e. BS 4190;f) the strength gr
41、ade symbol;BRITISH STANDARDBS 4190:20142 null The British Standards Institution 2014g) details of the coating (if required), in accordance with the appropriateBritish Standard (BS EN ISO 4042, BS 7371-6 or BS EN ISO 10684) (seeClause 20);h) whether a full-bearing face, is required (see Clause 11);i)
42、 whether bolts with split pin holes are required (see Clause 13).ExampleBlack bolts 10 mm diameter, 50 mm long, strength grade 4.6, would bedesignated:“Black bolts M10 50, 4.6 to BS 4190”.Screws faced under head only, 8 mm in diameter, 20 mm long, strengthgrade 4.8, would be designated:“Screws faced
43、 under head only, M8 20, 4.8 to BS 4190”.Black nuts 24 mm in diameter, galvanized, strength grade 4, would bedesignated:“Black nuts M24, 4 to BS 4190, galvanized to BS 7371-6”.NOTE Special requirements not covered by this British Standard are subject toagreement between the purchaser and the manufac
44、turer. The user options referredto in the standard, relating to the thread length (see Clause 8) and the drilling ofsplit pin holes (see Clause 13) are set out by the purchaser in their enquiry or order.3.2 Items to be agreed between the manufacturer and purchaserThe following items to be agreed bet
45、ween the contracting parties are specifiedin the clauses referred to and shall be fully documented. For compliance withthe standard both the definitive requirements specified throughout the standardand the following documented items shall be satisfied.a) the tolerances on screw threads (see 7.2);b)
46、whether free cutting steel is to be used for the manufacture of nuts (see17.2);c) minimum hardness values for nuts which are not proof load tested (seeClause 18).4 General dimensionsThe general dimensions and tolerances of bolts, screws and nuts shall be inaccordance with Table 1, Table 2, Table 3,
47、Table 4, Table 5, Table 6, Table 7,Table 8 and Table 13a and Table 13b and Clause 4 to Clause 13.5 Length of bolts and screws5.1 Nominal lengthThe nominal length of the bolts and screws shall be the distance from theunderside of the head to the extreme end of the thread, including any chamferor radi
48、us.NOTE Preferred nominal lengths of bolts and screws, in association with diameters,are given in Table 13a and Table 13b.5.2 Tolerance on lengthThe tolerance on the nominal length shall in accordance with Table 1.BRITISH STANDARD BS 4190:2014 The British Standards Institution 2014 null 3Table 1 Tol
49、erance on nominal lengths of bolts and screwsLength Bolts faced underhead only orblack bolts andscrewsScrews facedunder head onlyor bolts facedunder head andturned on shankOver Up to andincludingmm mm mm mm10 18 0.90 0.5518 30 1.05 0.6530 50 1.25 0.8050 80 1.50 0.9580 120 1.75 1.10120 180 2.0 1.25180 250 2.30 1.45250 315 2.60 1.60315 400 2.85 1.80400 500 3.15 2.006 Ends of bolts and screwsThe ends of bolts and screws shall be fi
