Bright zinc plated(BZP). Also known as thin nuts & lock nuts. Hexagon Half Nuts. Hexagon half nuts.
eBay
5/10/30PCS M8 Half Moon/Crescent Nut Half Moon Pad Alloy Crescent Pad Furniture Connecting Screws Washers for Bunk Bed Cots
Aliexpress UK
M12 HALF NUTS THIN HALF LOCK NUT A2 STAINLESS DIN 439. Shape Hexagon. Head Style Hexagon. Standard DIN 439. M12 - 12mm (Suitable Spanner Size 19mm). Locking Nuts are designed to lock in place whilst installing.
eBay
100pcs M6 T Spring Nuts 30-M6 Half Round Elasticity Nuts for 3030 Aluminum Profiles Connection Slot 8mm
Aliexpress UK
Nut thicknesses are half the thread size; i.e. M12 nuts are 6mm thick. Manufactured from Steel and Zinc Plated for improved corrosion resistance.
eBay
Sliding T Slot Nuts, M6/M8 Half Round T-Nut for 2020 3030 4040 Series Aluminum Extrusion Profile, Carbon Steel Nickel-Plated
Aliexpress UK
M2 M2.5 M3 M4 M5 M6 M8 M10 M12 HALF NUTS THIN HALF LOCK NUT A2 STAINLESS DIN 439. Standard DIN 439. M8 - 8mm (Suitable Spanner Size 13mm). M12 - 12mm (Suitable Spanner Size 19mm). M4 - 4mm (Suitable Spanner Size 7mm).
eBay
M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 316 Stainless Steel Half Hex Nuts Hex Machine Nuts Thin nutsA4 - 70
Aliexpress UK
Material: A2 Stainless Steel. Type: Lock Nuts (also known as Half Nuts). 20mm 30mm 10mm 2.5. 18mm 27mm 9mm 2.5. 16mm 24mm 8mm 2. 14mm 22mm 7mm 2.
eBay
Carbon Steel Galvanized Half Round Nut / Rectangular Screw Cap M4-M8
Aliexpress UK
M36 ; thread pitch; 4mm, spanner size; 55mm. M1. 6; thread pitch; 0. 35mm, spanner size; 3.2mm. A2 Stainless Steel Half Nuts. Manufactured from A2 stainless steel for improved corrosion resistance. Also known as lock nuts and thin nuts.
eBay
22-220mm Round Nut Half Moon Wrench - Adjustable Motorcycle Shock Absorber Wrench Set - Pre-Load Hook Spanners, C Spanner Tool
Aliexpress UK
Standard DIN 439.
eBay
Half Hollow Rivet Nut Punch M2 M2.5 M3 M4 M5 M6 M8 M10 Manual Press Knocking Crimping Flanging Hand Tool Riveter Machine Punch
Aliexpress UK
THIN HALF LOCK COUNTER NUTS STAINLESS STEEL M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M36. M24 - 24mm. M18 - 18mm. M14 - 14mm. M16 - 16mm. M12 - 12mm. M10 - 10mm. M20 - 20mm.
eBay
1/5 BOXES M3 M4 M5 Combination Set Half Round Head Cross Screw Nut Nut Nut Bolt Shim Assortment Kit
Aliexpress UK