SEMS Screw: Internal Tooth, #4-40 Thread Size, 1/2 in Lg, Stainless Steel, Passivated
The SEMS Screw: Internal Tooth is a #4-40 thread size, 1/2 in long, stainless steel, passivated, pan-head machine screw with an internal tooth lock washer, supplied in a 50-pack (MPN 1-PPI-4C-50). It features a #1…
SKU 3G-OTH-532064
Need installation or engineering help?
Ask a question
Product Description
The SEMS Screw: Internal Tooth is a #4-40 thread size, 1/2 in long, stainless steel, passivated, pan-head machine screw with an internal tooth lock washer, supplied in a 50-pack (MPN 1-PPI-4C-50). It features a #1 drive size and is designed for applications requiring a pre-assembled fastener that resists loosening under vibration.
Frequently Asked Questions
What is a SEMS screw with internal tooth lock washer used for?
A SEMS screw with an internal tooth lock washer is used in applications where vibration resistance is critical. The pre-assembled washer bites into the mating surface to prevent loosening. Common uses include electrical enclosures, panel assembly, and machinery where a reliable, reusable fastener is needed.
What are the specifications of the SEMS screw #4-40 1/2 in?
This SEMS screw has a #4-40 thread size, 1/2 in length, stainless steel construction with passivated finish, and a pan head. It includes an internal tooth lock washer and a #1 drive size. Supplied in a 50-pack with MPN 1-PPI-4C-50.
Where to buy SEMS screws #4-40 worldwide?
3G Electric supplies SEMS screws #4-40 worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver these fasteners to your facility. Contact us for pricing and lead time on the 50-pack (MPN 1-PPI-4C-50).
How to select the right SEMS screw for vibration resistance?
To select the right SEMS screw, match thread size, length, and head style to your application. The internal tooth lock washer provides vibration resistance by embedding into the surface. For corrosive environments, choose stainless steel passivated finish. Verify drive size (#1) matches your tooling.
SEMS Products
3G Electric supplies SEMS machine screws with internal tooth lock washers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.
