ASME B18.8.2 PDF

Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread nuts is limited to sizes l in. True Position of Tapped Hole. Tapped hole shall be countersunk on the bearing face or faces.

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The use of an addenda allows revisions made in response to public review comments or committee actions to be published as necessary.

The next edition of this Standard is scheduled for publication in ASME will issue written replies to inquiries concerning interpretation of technical aspects of this Standard. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.

The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment that provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent, nor assumes any such liability.

Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative s or person s affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.

ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which precludes the issuance of interpretations by individuals. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. For the next year or two an effort was made via correspondence to develop a basis on which a standard for straight, taper, split, and dowel pins might be established.

This correspondence exposed a distinct difference of opinion on the part of the manufacturers and users of taper machine pins, which seemed to discourage the members of the committee from attempting standardization on any of the types of pins within its scope.

The sponsor organization made frequent efforts to revive this project through letters and the distribution of technical literature on this general subject, without avail. At its meeting in December, , Sectional Committee B5 voted to enlarge its scope to include machine pins. Technical Committee No. Several drafts were prepared by the subgroup, distributed for critical comment to users, manufacturers, and general interests and revised and resubmitted for comments.

Proofs of the draft, with a date of October, were distributed to the members of Sectional Committee B5 for letter ballot approval. After the approval of the Sectional Committee, the proposal was next approved by the sponsor bodies, and presented to the American Standards Association for approval as an American Standard. This designation was granted on July 7, Following the issuance of the standard it became apparent that the table on cotter pins needed revision.

Accordingly in a proposed revision was submitted to the Sectional Committee. In and , in response to requests from industry, extensive changes were incorporated into a proposed revision. These included revisions to chamfer values and tolerances on straight pins and unhardened ground dowel pins; revisions to under-head-to- hole, pin end dimensions, and hole size tolerances on clevis pins; addition of chisel point to cotter pin end-styles; and the incorporation of coverage on grooved pins.

Recognizing that the bulk of the products covered in the ASA B5. Over several years, work by Subgroups 2, 3, 4, 5, and 6 culminated in a proposal for revising the standards covering taper, dowel, straight, and grooved pins and including coverage for spring pins which was approved through letter ballot by Subcommittee 8 on February 24, The B The edition of B Clever, Chair R. Strong, Vice Chair S. Vass, Vice Chair R.

Altman, Rotor Clip Co. Belford, Lawson Products, Inc. Byrne, Trade Association Management, Inc. Cockman, Ford Motor Co. Collier, Cam-Tech Industries, Inc. Drobnich, Alternate, Ford Motor Co. Dusina, Federal Screw Works D. George, Ford Motor Co. Greenslade, Greenslade and Co. Herskovitz, Consultant J. Hubbard, Rockford Fastener, Inc. Kern, Society of Automotive Engineers J. Koehl, Spirol International Corp. Langenstein, Consultant M. Lord, Caterpillar, Inc. McCrindle, Genfast Manufacturing Co.

McCullough, Consultant R. Meade, Camcar Textron R. Novotny, Whitesell Corp. Prasad, General Motors Corp. Slass, Alternate, Rotor Clip Co. Strong, General Motors Corp. Tennis, Alternate, Caterpillar, Inc. Vass, Lake Erie Screw Corp. Wackrow, MNP Corp. Weber, Fairfield University W. Wilcox, Consultant C.

Wilson, Industrial Fasteners Institute R. Wright, Wright Tool Co. Beshar, Chair, Groov-Pin Corp. Barry, Standard Lock Washer Co. Hampel, Allied-Locke Industry, Inc.

Herskovitz, Consultant D. Kerr, Kerr Lakeside, Inc. Sakatos, Vogelsang Corp. Schaumburg, Driv-Lok L. Sieper, Precise Products C.

ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard.

Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Upon request, the B18 Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B18 Standards Committee.

The request for interpretation should be clear and unambiguous. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested. The inquirer may also include any plans or drawings, which are necessary to explain the question; however, they should not contain proprietary names or information.

Requests that are not in this format will be rewritten in this format by the Committee prior to being answered, which may inadvertently change the intent of the original request. ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available.

Attending Committee Meetings. The B18 Standards Committee regularly holds meetings, which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the B18 Standards Committee. Dimensions are widely used in general industrial applications. Also are given in Table 3. This variety of dowel pin shall have ground cylindrical sides with both ends chamfered. These pins are intended 1. Consumers are factors do not warrant use of hardened pins, such as, requested to consult with manufacturers concerning prealigning component parts to be assembled with availability of product.

Dimen- 1. The types of pins covered by this Standard are 1. Straight pins shall have un- described in subparagraphs 1. Taper pins shall have a uniform nitely chamfered on chamfered straight pins and with taper over the pin length with both ends crowned. Most both ends having broken corners or being slightly sizes are supplied in both commercial and precision chamfered on square end straight pins. Dimensions are classes, the latter having generally tighter tolerances given in Table 5.

Grooved pins shall have un- Dimensions for both classes are given in Table 1. Both ends of pin are normally crowned or 1. Grooved pins are available in several types Pins.

Upon installation, the material dis- or crowned for driving purposes. They are available in placed by the grooves is forced back into the grooves standard and oversize diameter series to satisfy initial and reacts against the sides of the hole to promote and replacement requirements, respectively.


Inch Sizes - Standard Duty (ASME B18.8.2)



Taper Pins, Dowel Pins, Straight Pins, Grooved Pins, and Spring Pins (Inch Series)



ANSI/ASME B 18.8.2 - 2000 (R2005) Hardened ground machine dowel pins


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