Find the most up-to-date version of ASME BM at Engineering All dimensions are in mm. ANSI BM Metric Hex Bolts. TRANSHOW INDUSTRY LIMITED. GAOYANG RD, ZHOUHAN VILLAGE, JIANGSHAN. ASME-ANSI-BM Hex Head Bolts Dimensional Standards and Technical Specifications in Metric series ranging M3 upto M as per ASME and ANSI.
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ASME/ANSI B MMetric Hex Head Bolts
We need your help to maintenance this website. Please help us to share our service with your friends. Metric hex bolts shall conform to this document and Appendix III, which establishes standard itemsfor Government application. AppendixTable 4 shall be used for item selectionin accordance with the part numbering system and size information contained therein. Theindicated industry group has furnished the clearances required by existing regulations. Contractors and industry groups must obtain copies directly from: When reaffirmation, amendment, revision, or cancellation of this standard is initially proposed, the industry group responsible for this standard shall inform the Military Coordinating Activity of the proposed action and request their participation.
ThicknessProperty Class Metric hex bolts shall conform to this document and Appendix III, which establishes standarditemsfor Government application. Appendix III, Table 4 shallbe used for item selection in accordance with the part numbering system and size information contained therein. The indicated industry group has furnished the clearances required by existing regulations. Date of Specific Issue Adopted: No part of this document maybe reproduced in any form, in an electronic retrieval systemorotherwise, withoutthepriorwritten permission of the publisher.
Subcommittee 2 was subsequently established and charged with the responsibility for technical content of standards covering wrench head bolts and nuts.
At its meeting on December 4,Committee B18 authorized preparation of a series of standards for metric fasteners.
Subcommittee 2 was assigned responsibility for developing standards for metric hex bolts, screws and nuts.
At a meeting on September 22,Subcommittee 2 organized the contents of a standard covering eight different hex head screw and bolt products. Committee B18affirmed the TC2 decisions at a meeting on June 29, and drafting of this standard was b220.127.116.11m.
ASME-ANSI-B18.104.22.168M Standard, ASME-ANSI-B22.214.171.124M Metric Series Machine Screws
In FebruaryCommittee B18 established a cooperative program with the Department of Defense directly by the Government for procurement purposes.
The Department of Defense requested that each of the eight products be covered in separate standards, and Subcommittee 2 accepted this approach at its meeting on June 27, This was granted on April 26, Tisch, Desert Hot Springs. Rock Falls, Illinois R. Wagner, Illinois Tool Works, Inc. Bethlehem Steel Corporation, Lebanon, Pennsylvania f.
Piofrowski, Mack Trucks, Inc. Ruff, Department of the N a eWashington, D. Ferry Screw Products Company, Inc. Cowlin, Canton, Ohio J. b126.96.36.199m
Graves, Fairfield, Connecticut R. B18.2.3.m5, Bell Telephone Laboratories, Inc. Dimensions of Hex Bolts. A primarytechnical objective was to achieve a logical ratio between under head nut bearing surface area which determines the magnitude of the compressive stress on the bolted members and the tensile stress area of the screw thread which governs the clamping force that can be developed by tightening the fastener.
Consumers are requested to consultwithmanufacturersconcerning lists of stock production hexbolts. M10 bolts with 15 mm width across flats are currently being producedand used in U. This size, however, is not an IS0 standard.
Unless M10 bolts b18.2.35.m 15 mm width across flats are specifically ordered, M10 bolts with 16 mm width across flats shall be furnished. Comparison With IS0 Standards 2. The dimensional differences between this ANSI standardand IS0 are few, relatively minor,andnone will affect thefunctionalinterchangeability of bolts manufactured to the requirements ofeither. Diameters and threadpitches see 26 Body diameters Widths across flats see 2. Hex bolts in sizes Anis thru M24 are standard only in lengths longer than mm or 10D, whichever is shorter.
Bolts need not be finished on any surface except the threads. The top of head shall be full form and chamfered or rounded. Thediameterof the chamfer circle or the start of rounding shall be equal to the maximum width across flats within a tolerance of minus 15 percent.
The head b18.2.3.m5 is the distance, as measured parallel to theaxis of the bolt, from the top of the head to theunder head bearingsurface. A shoulder under the head may be supplied at option of themanufacturer.
When ashoulder is supplied, its diameter and lengthshall be as specified in Table 2. The wrenching height is the distance, measured at a comer of the hex, from the plane of the bearing surface to the last plane of full formed hex, Le. The fillet at junction of head and shank shall be a smooth concave curve within an envelope of R minimum and a radius tangent to the shank and to the underside of the head at a point equal to onehalf of Da maximum from the axis to the bolt.
Theroundingdue to lack offill at the six corners of the head shall be reasonably uniform. True Position of Head.
The axis of the hex head shall be located at true position with respect to the axis of the bolt determinedover a distance under the head equal to one bolt diameter within a tolerance zone of diameter equal to 6 percent of the 1b188.8.131.52m maximum width across flats.
ANSI B184.108.40.206M (1979)
The length of the boltshall be measured parallel to the axis of the bolt from the underside of head to the extreme end of the shank. Tolerancesfor bolt lengths ate given in Table 3. Bolts need not be pointed. Shanksof bolts shall be straight within a maximum camber annsi 0. The referee gage and gaging procedure for checking boltstraightness is given in Appendix I.
Metric Threaded Fasteners – Engineering Subjects
The bearing surface shall be reasonably flat. However, a die seam across the bearing face shall be permissible. Bearing surface shall be perpendicular to the axis of the body within a tolerance of 3 deg for sizes M24 and smaller, and 2 deg fol sizes larger than M Angularity measurement shall be taken at alocation to avoid interference from a die seam. Unless otherwise specified, screwsand bolts shall be supplied with a natural as processed finish, unplated or uncoated.
It represents the minimum design grip length of the ani and shall be used as the criterion for inspection g220.127.116.11m for determining thread availability when selecting bolt lengths even though usable threads may extend beyondthis point.
Minimum height of property class symbols shall be 1. Markings shall be located on the top of the head and may b18.104.22.168 raised or recessed unless otherwise ordered by the purchaser.
When raised, markings shall project not less than 0. Options, where specified, shall be at the discretion of the manufacturer unless otherwise agreed upon by the manufacturer and the purchaser.
Bolts shall not contain an excess of surfaceimperfections which might affect their serviceability, such as burrs, seams, laps, loose scale and other irregularities.
Threads shall bemetriccoarse thread series conforming to dimensions for general purpose external threads given in ANSI B1. The class 6g tolerance shall apply to plain finish unplated or uncoated bolts, and to plated or coated bolts before plating or coating.
For bolts with additive finish, the 6g diameters may be exceeded by the amount of the allowance, i. The recommended sizes of clearanceholes znsi material to beassembledusing hex bolts are the normal series given in Appendix II. Material and Mechanical Properties. Bolts of other materials such as stainless steel, brass, bronze b22.214.171.124mm aluminum alloys shall have properties as agreed upon by the manufacturer and the purchaser. NOTE It is common practice in IS0 standards to omit thread pitch from the product size designation whenscrew threads are the metric coarse thread series, e.
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