New RAF Electronic Hardware Stainless Steel Jack Screws, or Jackscrews, #4-40 Threads, Electronic Circuit Board Spacers, Part Number 4500-440-SS-20. Each offer quantity is for a Lot of Fifty (50) Jack Screws. You may offer / buy any number of lots, up to the total quantity available above.

These were purchased at an electronics wholesale company liquidation last year, and they were brand new in the original bulk factory bags. We packaged them in heavy Ziplok bags for resale.

According to the calipers:

Overall length: .375" / 9.54 MM

Length (underside of hex portion to tip): .188" / 4.77 MM

Length of hex section: .187" / 3/16" / 4.76 MM

Diameter (measured corner to corner): .208" / 5.28 MM

Hex size (measured flat to flat): .187" / 3/16" / 4.76 MM

Threads: #4-40 (diameter - threads per inch)

The part number 4500-440-SS-20 breaks down as follows:

4500: Length - 3/16"
440: Threads - #4-40
SS: Material - Stainless Steel
20: Finish Code - Passivate MIL-F-14072F