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Distributor's Link Magazine Summer 2022 / Vol 45 No 3


38 THE DISTRIBUTOR’S LINK SPIROL INTERNATIONAL CORP. 30 Rock Avenue, Danielson, CT 06239 TEL 1-860-774-8571 FAX 1-860-774-2048 EMAIL WEB HOW TO DESIGN THE PROPER HOLE FOR HEAT/ ULTRASONIC INSERTS by Christie Jones, Director of Marketing, Vice President Threaded Inserts for Plastics allow designers to replace machined and cast metal components with plastic to achieve significant cost and weight savings while maintaining bolted joint strength – provided that: [1] the proper Insert is selected for the application requirements, [2] the Insert is properly installed into the hole, and [3] the hole in which the Insert is used is designed correctly given the plastic composition, the selected Insert and installation method. Inserts also provide reusable threads and secure tight threaded joints. Given that Threaded Inserts are generally twice the diameter of screws, the load carrying ability of a joint that uses Inserts is increased by approximately four times the amount as when screws alone are used. Pull-out resistance can be further increased by increasing the length of the Inserts. Retention within the hole is provided by the plastic conforming to the external features of the Insert. A sufficient volume of plastic must be displaced to entirely fill these external features so that the Insert achieves maximum performance when the plastic solidifies. This White Paper focuses on the design guidelines for the holes in plastic assemblies that use Threaded Inserts installed by heat or ultrasonic equipment to ensure maximum performance is achieved. Optimum Design Guidelines Holes for Inserts installed by heat or ultrasonics should always be deeper than the length of the Insert. The assembly screw should never bottom out in the hole as jack-out would result. The recommended minimum hole depth is the Insert length plus two (2) thread pitches. The top of the installed Insert should be flush with the surface of the plastic part with maximum protrusion from the host of 0.13mm (.005”). TOP OF THE INSERT SHOULD BE INSTALLED AS CLOSE TO FLUSH AS POSSIBLE WITH THE SURFACE OF THE PLASTIC. Counterbores are only recommended for Headed Inserts so that the top of the Insert will be flush with the surface of the plastic after installation. The diameter of the counterbore should be 0.5mm (.02”) to 1.3mm (.05”) larger than the head diameter of the Insert. The minimum counterbore depth should be specified as the thickness of the head. TECHNICAL ARTICLE CONTINUED ON PAGE 122

THE DISTRIBUTOR’S LINK 39 Endries International is pleased to announce that we have acquired Store Room Fasteners. Store Room Fasteners was founded in 1984 in Montgomery, Alabama by Tim Wilsford. Tim started the business out of a storage shed and for nearly 40 years has continued to lead the business with a laser focused emphasis on meeting the needs of the Original Equipment Manufacturing and Industrial markets. Today, in addition to the Montgomery facility, Store Room Fasteners operates facilities in: Opelika and Selma, Alabama; Lagrange, Georgia; and Nuevo Laredo, Mexico. Tim’s ability to build a dedicated team of associates that carry forward the standard he personally set for meeting customer needs are the underpinnings of an organization that has seen continuous growth since inception. Additionally, a commitment to quality has always been at the forefront which is confirmed by the company’s accreditation to ISO 9001 for over 14 years. Store Room Fasteners major fulfillment offerings today include: vendor managed inventory, sub-assemblies, and kitting solutions. Store Room Fasteners will continue to operate on their current ERP system as Store Room Fasteners, An Endries International Company. Tim Wilsford will remain with the company in a leadership position over the 60 dedicated associates. Endries is a leading distributor of fasteners and Class-C parts serving industrial Original Equipment Manufacturers (OEM’s) and the Industrial marketplace worldwide. From its headquarters in Brillion, WI and eleven U.S. and international distribution centers, Endries provides over 500,000 SKUs to its customer base. Endries operates primarily through a vendor managed inventory model, managing C-part categories for its customers across diverse industrial end markets. Endries partners with customers through robust replenishment systems that provide products and support services which are critical to maintaining the manufacturing process. “Endries is thrilled to welcome Store Room Fasteners into our family. Tim has built an organization that mirrors what Endries was and is. The methodology and approach both companies follow is very consistent. We look forward to working with our new team members to improve our overall market offerings.” said Steve Endries, President of Endries. For more information about Endries International’s products and services, contact them at 714 West Ryan Street, PO Box 69, Brillion, Wisconsin USA 54110. Tel: 920- 756-5381, or visit them online at


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