Threaded Inserts / Heli Coil:1/4" x 9 UNF - DIN 8140 B

These threaded inserts are manufactured to the DIN 8140 B standard, featuring a 1/4 inch nominal diameter with a 9-unit nominal length in the UNF thread series. Constructed for insertion into pre-tapped holes, they are designed to reinforce or repair internal threads in softer materials where direct threading may fail. Buyers select this specific configuration to ensure compatibility with 1/4 inch UNF fasteners while adhering to European dimensional standards. The choice of the UNF series aligns the insert with American coarse thread systems, facilitating interchangeability in mixed-standard assemblies. To select the correct part, verify that the host material hole is prepared for a 1/4 inch diameter and that the available depth accommodates the 9-unit insert length.