Value Collection SIW7X0250-200BX M2.5 Lock Washer 200pk

Product Description

The VALUE COLLECTION SIW7X0250-200BX is an M2.5 internal tooth lock washer designed to maintain fastener tension and resist loosening under vibration. Manufactured from 18-8 austenitic stainless steel to Grade A2, this washer delivers corrosion resistance suitable for wet, chemical-exposure, or outdoor environments. The internal tooth design bites into both the bearing surface and the fastener shank when torqued, creating a mechanical lock that resists rotation. With a 2.7mm inside diameter and 5.5mm outside diameter, it is sized for M2.5 screws and bolts. The uncoated finish preserves material properties without added plating. This item is sold in a minimum quantity of 200 pieces per order.

This washer is used across light mechanical assemblies, electronic enclosures, instrumentation panels, and precision equipment where small-diameter fasteners require reliable locking without thread-locking compounds. The M2.5 sizing is common in electronics, HVAC control boards, small motor assemblies, and panel hardware. Trade professionals including electricians, HVAC technicians, and equipment fabricators reach for internal tooth lock washers in applications where vibration or thermal cycling would otherwise allow fastener back-out. The stainless steel construction makes this washer appropriate for both indoor and corrosion-prone environments.

Key Features

• Internal tooth design grips fastener shank and mating surface to resist loosening under vibration
• 18-8 austenitic stainless steel, Grade A2 construction for corrosion resistance
• 2.7mm inside diameter fits M2.5 screws and bolts
• 5.5mm outside diameter with 0.4mm thickness for compact footprint in tight assemblies
• Uncoated finish maintains dimensional accuracy without plating buildup
• Sold in 200-piece quantity for shop and service stock

Compatibility

Designed for use with M2.5 screws and bolts in light mechanical, electrical, and instrumentation assemblies requiring internal tooth locking washers.

Installation Notes

Install with the teeth facing the fastener head or nut bearing surface, not against the workpiece. Ensure the mating surfaces are clean and free of debris before assembly to allow the teeth to seat properly. Tighten fasteners with hand tools appropriate for the application; avoid power tools that may over-torque small-diameter hardware. Stainless steel fasteners and washers are susceptible to galling — apply anti-seize where required by the application.