Services Sign In Axis All Categories > ATLAS® Brand Rivet Nuts > Atlas MaxTite® Rivet Nuts > Flathead > Flathead Threaded Insert - Closed End Keyed - Unified > Part # AESS31KB125 Axis All CategoriesAxis All Categories ATLAS® Brand Rivet NutsATLAS® Brand Rivet Nuts Atlas MaxTite® Rivet NutsAtlas MaxTite® Rivet Nuts FlatheadFlathead Flathead Threaded Insert - Closed End Keyed - UnifiedFlathead Threaded Insert - Closed End Keyed - Unified Part # AESS31KB125 Part # AESS31KB125, Flathead Threaded Insert - Closed End Keyed - Unified AESS31KB125Flathead Threaded Insert - Closed End Keyed - Unified Request Information Add to CAD Cart Email This Page Download PDF Download PDF Printable Page VIEW CAD DRAWING 3D 2D Front View 2D Left Side View 2D Sales Drawing DOWNLOADS PEM ATLAS Bulletin /Asset/Flathead.jpg /Asset/Flathead.jpg Close Window Designed for high load applications. Available with rib, key or full hex features for high torque applications.Both UNC and UNF threads available in No. 10 and larger thread sizes. Check for availability of other grip ranges and designs. Unit of Measure Imperial Metric Both Specifications Thread Size N/A 5/16-18 Grip Range N/A .030 - .125 in Identification Mark N/A Blank B ± .015 N/A .665 in C Nom. N/A .062 in øD + .000 - .004 N/A .413 in E Max. N/A .505 in F + .005 -.000 N/A .120 in G Max. N/A .040 in L ± .015 N/A 1.187 in K Ref. N/A .550 in P - Keyway Width + .003 -.000 N/A .128 in H - Keyway Height N/A .097 - .102 in Install Drill Size Ref. N/A Z Install Hole Size Min. N/A .413 in Install Hole Size Max. N/A .423 in Pull Up Factor N/A .120 in Weight per 1000 N/A 18.2 lb Fastening N/A Uninstalled Thread Specification N/A 3B per ASME B1.1 Standard Material N/A 430 Series Stainless Steel Standard Finish N/A Passivated and/or tested per ASTM A380 CAD Supplier N/A PennEngineering® (Atlas®) Required Fields * Email * First Name * Last Name * Company * Country * United States of America Afghanistan Albania Algeria Andorra Angola Anguilla Antigua & Barbuda Argentina Armenia Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia Bosnia & Herzegovina Botswana Brazil Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China China - Hong Kong / Macau Colombia Comoros Congo Congo, Democratic Republic of (DRC) Costa Rica Croatia Cuba Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Eswatini Ethiopia Fiji Finland France French Guiana Gabon Gambia, Republic of The Georgia Germany Ghana Great Britain Greece Grenada Guadeloupe Guatemala Guinea Guinea-Bissau Guyana Haiti Honduras Hungary Iceland India Indonesia Iran Iraq Ireland Israel Italy Ivory Coast (Cote d'Ivoire) Jamaica Japan Jordan Kazakhstan Kenya Korea, Democratic Republic of (North Korea) Korea, Republic of (South Korea) Kosovo Kuwait Kyrgyz Republic (Kyrgyzstan) Laos Latvia Lebanon Lesotho Liberia Libya Liechtenstein Lithuania Luxembourg Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar/Burma Namibia Nepal Netherlands New Zealand Nicaragua Niger Nigeria North Macedonia, Republic of Norway Oman Pacific Islands Pakistan Panama Papua New Guinea Paraguay Peru Philippines Poland Portugal Puerto Rico Qatar Reunion Romania Russian Federation Rwanda Saint Kitts and Nevis Saint Lucia Saint Vincent and the Grenadines Samoa Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Slovak Republic (Slovakia) Slovenia Solomon Islands Somalia South Africa South Sudan Spain Sri Lanka Sudan Suriname Sweden Switzerland Syria Tajikistan Tanzania Thailand Timor Leste Togo Trinidad & Tobago Tunisia Turkey Turkmenistan Turks & Caicos Islands Uganda Ukraine United Arab Emirates Uruguay Uzbekistan Venezuela Vietnam Virgin Islands (UK) Virgin Islands (US) Yemen Zambia Zimbabwe Zip/Postal Code * Phone Number * City * User Information How is your information being used? View Privacy Policy I agree to the terms of the Privacy Policy * Submit