--- title: Advanced Performance Weldon Flat - A Better Shank Flat description: Are you looking to increase tool-holding capabilities with your cutting tools? Check out Fullerton's Advanced Performance Weldon Flat! It eliminates the flute hollow in the holder allowing full radial grip of the holder and protecting it from numerous issues. Find out more about it here. image: https://blog.fullertontool.com/hubfs/AP-Weldon-Flat.png --- Menu [![fullerton](https://blog.fullertontool.com/hubfs/raw_assets/public/Fullerton_June2021/images/fullerton-logo.svg "fullerton")](https://fullertontool.com/) Close - [Search Tools](https://fullertontool.com/search) - Products - [End Mills](https://fullertontool.com/products/end-mills) - [Drills](https://fullertontool.com/products/drills) - [Drill Mills](https://fullertontool.com/products/drill-mills) - [Burrs](https://fullertontool.com/products/burrs/burr-rotary-files) - [Keyseat Cutters](https://fullertontool.com/products/keyseats/4375-general-purpose) - [Saws](https://fullertontool.com/products/saws) - [Reamers](https://fullertontool.com/products/reamers) - [Countersinks](https://fullertontool.com/products/countersinks) - [Routers](https://fullertontool.com/products/routers) - [Boring Tools](https://fullertontool.com/products/boring-tools/2400-boring-tool) - [Custom Tooling](https://fullertontool.com/resources/custom-tooling) - [JIT Services](https://fullertontool.com/resources/jit-services) - Resources - [Downloads](https://fullertontool.com/resources/downloads) - [Speeds & Feeds](https://fullertontool.com/resources/speeds-and-feeds) - [Tool Search](https://fullertontool.com/search) - [S&F Calculator](https://fullertontool.com/calculators/high-performance-end-mill) - [Coating Search](https://fullertontool.com/resources/coating-search) - [Regrind Services](https://fullertontool.com/resources/regrind-services) - [Video Library](https://fullertontool.com/resources/videos) - [Training](https://fullertontool.com/resources/education) - Quotes - [Special End Mill](https://fullertontool.com/quote/jit-endmill) - [Altered End Mill](https://fullertontool.com/quote/altered-end-mill) - [24H JIT Reamer](https://fullertontool.com/quote/jit-reamer) - [End Mill](https://fullertontool.com/quote/end-mill) - [Drills](https://fullertontool.com/quote/drill) - [Reamers](https://fullertontool.com/quote/reamer) - [Keyseat Cutter](https://fullertontool.com/quote/keyseat) - [Saw](https://fullertontool.com/quote/saw) - About - [About Us](https://fullertontool.com/about) - [FAST](https://fullertontool.com/about/fast) - [Careers](https://fullertontool.com/about/careers) - [FAQ](https://fullertontool.com/about/faq) - [Blog](https://blog.fullertontool.com/) - Contact - [Contact](https://fullertontool.com/contact) - [Rep Locator](https://fullertontool.com/contact/locator) - [Login](https://fullertontool.com/login) - [Register](https://fullertontool.com/register) [![fullerton](https://blog.fullertontool.com/hubfs/raw_assets/public/Fullerton_June2021/images/fullerton-logo.svg "fullerton")](https://fullertontool.com/) [Cart](https://fullertontool.com/checkout/cart) - Products - [End MillsOffering covers any milling operation and material.](https://fullertontool.com/products/end-mills) - [Keyseat CuttersDesigned where narrow width slots are necessary.](https://fullertontool.com/products/keyseats/4375-general-purpose) - [DrillsOffering covers any drilling operation and material.](https://fullertontool.com/products/drills) - [SawsManufactured to exact size requirements within 24 hours.](https://fullertontool.com/products/saws) - [Drill MillsDesigned for chamfering and milling.](https://fullertontool.com/products/drill-mills) - [BurrsDesigned to clean (deburr) castings](https://fullertontool.com/products/burrs/burr-rotary-files) - [ReamersReamers stocked and made to exact sizes within 24 hours.](https://fullertontool.com/products/reamers) - [Countersinks1 & 6 flute options perfect for any material.](https://fullertontool.com/products/countersinks) - [RoutersOffering for any material or application.](https://fullertontool.com/products/routers) - [Boring ToolsTapered clearance neck improves rigidity with less deflection.](https://fullertontool.com/products/boring-tools/2400-boring-tool) - [Custom ToolingCustom tooling solutions that increase efficiency.](https://fullertontool.com/resources/custom-tooling) - [JIT ServicesJust-in-time services available to ship in 24-48 hours.](https://fullertontool.com/resources/jit-services) - Resources - [DownloadsExplore and download available catalogs, brochures, and flyers.](https://fullertontool.com/resources/downloads) - [Speeds & FeedsExplore and download available speeds and feeds.](https://fullertontool.com/resources/speeds-and-feeds) - [Tool SearchSearch by tool types, specs, geometry, or materials.](https://fullertontool.com/search) - [Speed & Feeds Calculator Calculate your optimal speed & feed rates.](https://fullertontool.com/calculators/high-performance-end-mill) - [Coating SearchSearch by material and cutting operation for optimal coating.](https://fullertontool.com/resources/coating-search) - [Regrind ServicesRecondition your tooling at a fraction of the cost.](https://fullertontool.com/resources/regrind-services) - [Video LibraryWatch our products in action and find out more about Fullerton.](https://fullertontool.com/resources/videos) - [Education & TrainingLearn more about our products and processes.](https://fullertontool.com/resources/education) - Quotes - - [Special End MillInstant pricing & lead times on special end mills.](https://fullertontool.com/quote/jit-endmill) - [Altered End MillInstant pricing & lead times on altered end mills.](https://fullertontool.com/quote/altered-end-mill) - [JIT 24H ReamerInstant pricing & lead times on 24-hour JIT reamers.](https://fullertontool.com/quote/jit-reamer) - - [End MillBuild altered and custom end mills to your specifications.](https://fullertontool.com/quote/end-mill) - [DrillBuild custom drills to your specifications.](https://fullertontool.com/quote/drill) - [ReamerBuild JIT and custom reamers to your specifications.](https://fullertontool.com/quote/reamer) - [Keyseat CutterBuild custom keyseat cutters to your specifications.](https://fullertontool.com/quote/keyseat) - [SawBuild custom saws to your specifications.](https://fullertontool.com/quote/saw) - About - [About UsFind out all about who we are and what we do.](https://fullertontool.com/about) - [FASTFAST is the foundation to our company’s success.](https://fullertontool.com/about/fast) - [CareersSee what our employees have to say about working for us.](https://fullertontool.com/about/careers) - [FAQFind answers to our frequently asked questions.](https://fullertontool.com/about/faq) - [BlogGet the latest information on everything Fullerton.](https://blog.fullertontool.com/) - Contact - [Contact UsWe are here to help.](https://fullertontool.com/contact) - [Rep LocatorFind representatives in your area](https://fullertontool.com/contact/locator) - [Login](https://fullertontool.com/login) ![](https://blog.fullertontool.com/hubfs/AP-Weldon-Flat.png) # Advanced Performance Weldon Flat - A Better Shank Flat Published by [Steven Oszust Jr.](https://blog.fullertontool.com/author/steven-oszust-jr) on November 15, 2022 Are you looking to increase tool-holding capabilities with your cutting tools? We offer many shank treatments and options, one of the most popular and simplest being the Weldon Flat. The Weldon Flat was invented by Carl A. Bergstrom in 1918 and at times is considered old technology. At the time the simple shank flat was more than sufficient to lock the tool into the holder, increasing grip strength and eliminating pull-out. With advancements in technology, considerations to rigidity, and further standardization of the tool holder market, we adapted our own version, making necessary improvements to the original, and came up with the Advanced Performance Weldon Flat.  The Advanced Performance Weldon Flat addresses the shortcomings of the original flat. It eliminates the flute hollow in the holder allowing full radial grip of the holder and protecting it from numerous issues, like reduction in gripping force, holder erosion, chip packing and nesting, balance issues, and potential for catastrophic damage to the holder from tool breakage.  We recommend using the Advanced Performance Weldon Flat for any new applications where tool-holding is needed. Check out the specs below.  #### Advanced Performance Weldon Flat Specifications ![Chart_AdvancedWF](https://blog.fullertontool.com/hs-fs/hubfs/Chart_AdvancedWF.png?width=432&height=241&name=Chart_AdvancedWF.png)![Single-AP-Flat](https://blog.fullertontool.com/hs-fs/hubfs/Single-AP-Flat.png?width=440&height=185&name=Single-AP-Flat.png)         ![Double-AP-Flat](https://blog.fullertontool.com/hs-fs/hubfs/Double-AP-Flat.png?width=399&height=168&name=Double-AP-Flat.png)           Want to add an Advanced Performance Weldon Flat to an existing end mill? Quote it instantly at: [https://fullertontool.com/quote/altered-end-mill.](https://fullertontool.com/quote/altered-end-mill)Or contact our Customer Service team at 800.248.8315 or sales@fullertontool.com.   Tags: [weldon flats](https://blog.fullertontool.com/topic/weldon-flats), [weldon flat](https://blog.fullertontool.com/topic/weldon-flat) [Back to Blog](https://blog.fullertontool.com) ## Related Articles ## [Custom Drill, Chamfer, Back Chamfer Tool Saved Customer $114K Annually](https://blog.fullertontool.com/drill-chamfer-back-chamfer-custom-tool) Here at Fullerton, we're passionate about generating cost savings for our customers and creating... [Read More](https://blog.fullertontool.com/drill-chamfer-back-chamfer-custom-tool) ## [SVSU MFG Engineer - 2022 Senior Capstone Project](https://blog.fullertontool.com/svsu-mfg-engineer-2022-senior-capstone-project) We at Fullerton have been fortunate enough to work with Saginaw Valley State University's... [Read More](https://blog.fullertontool.com/svsu-mfg-engineer-2022-senior-capstone-project) ## [Saw Blade Applications & Efficiencies](https://blog.fullertontool.com/saw-blade-applications-efficiencies) This month we will discuss three effective ways our engineering and applications teams use our... [Read More](https://blog.fullertontool.com/saw-blade-applications-efficiencies) ### Contact Us 800.248.8315 [sales@fullertontool.com](mailto:sales@fullertontool.com) ### Stay In Touch [Subscribe to Our Emails](https://landing.fullertontool.com/subscribe-to-newsletter) ### Connect Fullerton Tool Company, Inc. © 2026 [Terms of Service](https://fullertontool.com/legal/termsofservice) [Privacy Policy](https://fullertontool.com/legal/privacypolicy)