Pololu - Aluminum Standoff: 1-1/4 Length, 4-40 Thread, M-F (4-Pack)

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 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 1.25 (32 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.

Spacer sleeve 5mm / 3.2mm, length 30mm, white polyamide - Kamami

2104-440-AL-MF HEX STANDOFF 1/4 HEX X 1/2 L X 4-40 ID ALUMINUM

These 1/4-long hexagonal female-female aluminum standoffs keep parts spaced 0.25 inches (6.4 mm) apart. They are like elongated, 3/16″-wide hex nuts,

Aluminum Standoff: 1/4 Length, 4-40 Thread, F-F (4-Pack)

Pololu - Claire's dead reckoning robot

Pololu 1977 - Nylon Spacer: 20mm Length, 4mm OD, 2.7mm ID (10-Pack

Pololu RP5/Rover 5 Expansion Plate RRC07B (Wide) Solid Blue

Pololu - Aluminum Standoff for Raspberry Pi: 11mm Length, 6mm M2.5

Pololu 1943 - Aluminum Standoff: 3/4 Length, 2-56 Thread, M-F (4

Aluminum Standoff: 3/4 Length, 2-56 Thread, M-F (4-Pack)

Pololu 1943 - Aluminum Standoff: 3/4 Length, 2-56 Thread, M-F (4-Pack)

Pololu RP5/Rover 5 Expansion Plate RRC07B (Wide) Transparent

Pololu - Paul's dead reckoning robot

Pololu 2089 - Aluminum Standoff: 5/16 Length, 4-40 Thread, F-F (4