Prevailing Torque Locknuts (Inch Series)
Prevailing Torque Locknuts (Inch Series)
This Standard will be revised when the Society approves the issuance of a new edition.
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CONTENTS
Foreword ivCommittee Roster ACorrespondence With the B18 Committee IA2 1 Introduction . Reference Standards 13 Terminology 14 Dimensions. 15 Nut Designs and Property Grades. 26 Corner Fill 27 Chamfers and Bearing Circles. 28 Threads Countersinks 29 10 Material Mechanical and Performance Properties 11 211 Test Methods. 1112 Grades and Manufacturing Marking 1513 Quality Assurance. 1514 Workmanship. 1515 Designation . 15
Tables
Chemical Composition Requirements 2Hardness Requirements Style NE Nylon Insert Locknut Dimensions 2 34 Style NTE Nylon Insert Locknut Dimensions Style NU Nylon Insert Locknut Dimensions 45 6 Style NTU Nylon Insert Locknut Dimensions 58 Style NM Nylon Insert Locknut Dimensions Style NTM Nylon Insert Locknut Dimensions 7 76 10 Dimensions of Prevailing Torque All-Metal Type Hex Nuts Dimensions of Nylon Insert Hex Flange Nuts 8 911 Proof Loads Clamp Loads and Prevailing Torques for Coarse Thread Locknuts Dimensions of Prevailing Torque All-Metal Type Hex Flange Nuts 10 1212 13 Proof Loads Clamp Loads and Prevailing Torques for Fine Thread Locknuts 1314 Proof Loads Clamp Loads and Prevailing Torques for 8-UN Series Thread Locknuts 13
FOREWORD
ASME B18.16.6-2008 was balloted and approved by the B18 Standards Committee andB18 Submittee 16 on April 29 2008. The proposal was submitted to the American National Standards Institute and designated as an American National Standard on August 25 2008.
include all styles of locking nuts.B18.16.6 now contained dimensional and performance require At the B18 meeting in the fall of 2011 Submittee 16 decided to expand this Standard toments for nonmetallic insert and all-metal locking nuts in a variety of grades. This Standard wasthe publication of this Standard. ASME B18.16.6-2014 was balloted and approved by the B18 intended to replace IFI-100/107 which the Industrial Fasteners Institute agreed to withdraw afterStandards Committee and B18 Submittee 16 on March 12 2014.
At the B18 meeting in the spring of 2015 Submittee 16 decided to revise this Standardbased on several technical and editorial updates. Updates to this Standard include lowering the proof and clamp load values of thin nuts from 60% to 45% of regular hex nuts; harmonizingproof loads with SAE J995 2012 resulting in lower proof loads for fine and 8-UN series nuts;correcting hex height values on style NTM locknuts; clarifying er fillrequirements; increasing the proof load requirement for style NU locknuts; and correcting various table references.
Suggestions for improvement of this Standard are wele. They should be sent to Secretary B18 Committee The American Society of Mechanical Engineers Two Park Avenue New York NY 10016-5990.
