100-Pieces 4040 Series European T Nut Assortment Kit, M4 M5 M6 Hammer Head Drop in T Slot Nuts for 40 Series Aluminum Profile - Nickel Plated Carbon Steel | Walmart Canada
FATH T-Slot 40 Series Hammer Nut (8mm Slot) with M4 Tapped Hole - Part # 096H08430
T Nut Hammer Head Fasteners Nut M4/M5/M6/M8, T Slot Nut for Aluminum Profile - China Hammer Head Nuts, T Slot Nuts | Made-in-China.com
XINGYHENG 200Pcs M4 M5 T Nuts Hammer Head Fastener Nut Drop in T Slot – BIG CONSUMER SALES
Hammer Head Nut Slot 8 M4 series 40 (bag of 10) - GAP Engineering