New Fastenal NySeal Port Plugs, #10-32 Threads with Nylon Seals, for Miniature Solenoid Valves and Manifolds; Part Number 10173-01567.  Each bid quantity is for a Lot of One Hundred (100) Pieces.  You may bid / buy any number of lots, up to the total quantity available above.

These were purchased at an industrial liquidation earlier this year, and they were brand new in the original factory boxes.  We packaged them in heavy Ziplok bags for resale. These are perfect for plugging unused ports and other connections on solenoid valves and manifolds. The tough and smooth nylon seal material is permanently attached to the underside of the screw head and the upper thread or two. The only way to (halfway) remove the seal is with a pocket knife. Would be excellent for any application where a tenacious seal is needed around a 10-32 machine screw. Pressure rating is 500 PSI (34.46 BAR). The 1/8" length provides adequate threads for tightening, without over penetrating into internal mechanisms. Installation and removal is quick and easy with a simple slotted screwdriver, so you don't have to scrounge for the right size Allen wrench or hex nut driver.

According to the calipers:

Overall length:  .238" / 6.05 MM

Length (underside of head to tip):  .125" / 3.17 MM

Head diameter:  .365" / 9.28 MM

Drive type:  Slotted

Slot width:  .056" / 1.43 MM

Threads:  #10-32 x 1/8" (diameter - threads per inch x grip length)

Material:  Steel

Surface treatment: Zinc

Pressure rating: 500 PSI

According to the manufacturer:

NYSEAL® Eliminates O-Rings, Gasket Seals and Sealant Compounds

The green-colored pre-applied NYSEAL® sealing element from Nylok Corporation eliminate the time-consuming in-house application of O-rings, gasket seals and sealant compounds by creating a gasket-like seal at pressures up to 500 psi. The coating is permanently fused on the bearing surface of the fasteners, eliminates the leak path and will not work loose. As the screw is seated to its final position against the mating part, the NYSEAL® element compresses slightly and fills the void under the bearing surface of the head and countersink or bore.

It prevents galvanic corrosion between dissimilar materials, is highly durable and will not shrink or dry out from age. Fasteners treated with NYSEAL® are reusable and will not work loose. NYSEAL® also works in temperatures up to 150ºF (66ºC) and is resistant to chemicals like alcohol, gasoline, oil, kerosene, diesel fuel and hydraulic fluids. It requires no additional curing or heating after installation.