SEMS Screw: Internal Tooth, 1/4"-20 Thread Size, 1 1/2 in Lg, Stainless Steel
The SEMS Screw: Internal Tooth (SKU 849C16) is a machine screw with an integrated internal tooth lock washer, supplied in a 10-pack. This stainless steel, passivated fastener features a 1/4"-20 thread size, 1 1/2 in…
SKU 3G-OTH-532092
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Product Description
The SEMS Screw: Internal Tooth (SKU 849C16) is a machine screw with an integrated internal tooth lock washer, supplied in a 10-pack. This stainless steel, passivated fastener features a 1/4"-20 thread size, 1 1/2 in length, and a #3 drive size (MPN 1-PPI-25C-150).
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 to fasten components while resisting loosening from vibration. The integrated washer bites into the mating surface, making it ideal for industrial assemblies in machinery, electrical panels, and automotive applications where a secure, permanent hold is required.
What are the specifications of the SEMS screw 1-PPI-25C-150?
The SEMS screw 1-PPI-25C-150 has a 1/4"-20 thread size, 1 1/2 in length, #3 drive size, and is made of passivated stainless steel. It comes in a 10-pack with an integrated internal tooth lock washer. These specs ensure compatibility with standard 1/4"-20 nuts or tapped holes in corrosive environments.
Where to buy SEMS screws with internal tooth lock washer worldwide?
3G Electric supplies SEMS screws with internal tooth lock washer worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this SEMS screw (SKU 849C16) to your facility. Contact us for a quote and delivery timeline to your location.
How to install a SEMS screw with internal tooth lock washer?
To install a SEMS screw, drive it into a tapped hole or through a clearance hole with a nut using a #3 drive tool. The pre-assembled internal tooth washer will compress as you tighten, creating a locking action. Avoid over-torquing to prevent stripping the stainless steel threads or damaging the washer teeth.
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.









