Amazon.com: Helicoil M4x0.7 and M6x1.0 Threaded Inserts, Set of 10 Stainless Steel Threaded Inserts, M4x0.7 Female Thread Reducing Nut M6x1.0 Male Thread with 8mm Length : Industrial & Scientific
Amazon.com: Threaded M4 Insert Kit - 50 Stainless Steel Coil Inserts for Reliable Parts with Frequent Removal | Helical Insert Set for Durable Fastening and Repair : Industrial & Scientific
NUTW-34378 CLS-M2/M3/M4/M10 Self Clinching Nuts Clinch Nut Press in Nuts Crimped Rack Server Cabinet Insert Rivet INOX Standard - (Size: CLS-M2.5 (20pcs)/ Type: -1) - Amazon.com
uxcell Knurled Insert Nuts - 50Pcs M4 x 6mm Length x 6.4mm OD Female Thread Brass Threaded Insert Embedment Nut for 3D Printer: Amazon.com: Industrial & Scientific