https://www.parts4world.com/steel-male-female-threaded-standoffs.html
Male-female standoffs manufacturer & exporter - Parts4world
male female standoffsmanufacturerexporter
https://psmfasteners.com/product/threaded-spacers-and-standoffs-m4-x-40-hex-male-female-stainless-steel-spa02ssm440mm/
Threaded Spacers & Standoffs M4 X 40 Hex Male / Female Stainless Steel (SPA02SSM440MM) - PSM...
May 10, 2026 - Premium M4 x 40 hex stainless steel spacer, male/female type. Ideal for secure mechanical spacing and stability.