Pololu - Aluminum Standoff: 3/4 Length, 4-40 Thread, M-F (4-Pack)

These hexagonal male-female aluminum standoffs keep parts spaced 0.75" (19 mm) apart and are great for building a multi-level robot chassis. Both ends of these 3/16"-wide standoffs have 4-40 threads. The standoffs are sold in packs of 4.
These hexagonal male-female aluminum standoffs keep parts spaced 0.75 (19 mm) apart and are great for building a multi-level robot chassis. Both ends of these 3/16-wide standoffs have 4-40 threads. The standoffs are sold in packs of 4.

Standoff Spacer Stud Fastener Pcb Spacer Standoff 3mm Hole - 4-40 Hex Male Female - Aliexpress

Hex Standoff Threaded - #4-40, Aluminum, 2.375in. (60.33mm) - PRT-15432 - SparkFun Electronics

Pololu 2086 - Aluminum Standoff: 1/8 Length, 4-40 Thread, F-F (4-Pack) - Kamami on-line store

Aluminum Standoff: 3/4 Length, 4-40 Thread, M-F (4-Pack) at MG Super Labs India

M-F threaded bushing M3, length 5mm, white polyamide - Kamami on-line store

Aluminum Standoff: 1/2 Length, 2-56 Thread, M-F (4-Pack)

Pololu 1942 - Aluminum Standoff: 1/2 Length, 2-56 Thread, M-F (4-Pack)

Aluminum Standoff: 3/8 Length, 4-40 Thread, M-F (4-Pack) at MG Super Labs India

RS PRO, RS PRO Standoff, M4 x M4 Thread, 16mm Body, Nylon, Female/Female, 653-9475

Aluminum Standoff: 1/4 Length, 2-56 Thread, F-F (4-Pack)

Pololu 2082 - Aluminum Standoff: 1/4 Length, 2-56 Thread, F-F (4-Pack)

Tulejka dystansowa 4mm / 2.7mm, długość 12mm, nylon, 25 sztuk - sklep Kamami

These hexagonal male-female aluminum standoffs keep parts spaced 1.25 (32 mm) apart and are great for building a multi-level robot chassis. Both ends

Aluminum Standoff 1.25 x 0.25 4-40 M-F 4-Pack

Aluminum Standoff: 3/8 Length, 4-40 Thread, M-F (4-Pack) at MG Super Labs India