🪛 Product Description
M3 nylon shoulder washers are precision moulded PA66 components designed to insulate, space, and protect M3 fasteners in mechanical and electrical assemblies.
Commonly referred to as insulation bushes, isolation sleeves, or top hat washers, the integrated shoulder allows the washer to sit inside a panel hole while electrically isolating the screw from surrounding materials.
The M3 range is widely used in circuit boards, enclosures, control panels, light automotive components, and equipment housings where controlled spacing and non-conductive separation are required.
Manufactured from durable PA66 nylon, these washers offer strong wear resistance, chemical resistance, and electrical insulation performance.
Available in multiple length variants to suit different panel thicknesses and stand-off requirements.
📏 Dimensions – M3 Range
| Size | Major OD (mm) | Minor OD (mm) | ID (mm) | Head Thickness (mm) | Length (mm) |
|---|---|---|---|---|---|
| M3 x 2 | 6.2 | 4 | 3.1 | 1 | 2 |
| M3 x 3.18 | 7.37 | 4.32 | 3.56 | 1.2 | 3.18 |
| M3 x 4.75 | 7.37 | 4.32 | 3.56 | 1.17 | 4.75 |
| M3 x 6.35 | 7.37 | 4.32 | 3.56 | 1.2 | 6.35 |
🔩 Key Features
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Designed for M3 screws and bolts
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Manufactured from PA66 nylon
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Electrically insulating and non-conductive
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Resistant to corrosion and moisture
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Shoulder design allows panel insertion
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Prevents metal-to-metal contact
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Suitable for electronics, automotive, and precision engineering
❓ FAQs
What are M3 shoulder washers used for?
They are used to insulate and space M3 fasteners in electrical and mechanical assemblies.
What is the purpose of the shoulder on the washer?
The shoulder sits inside the drilled hole and isolates the fastener from the surrounding panel material.
Are these suitable for circuit boards?
Yes. M3 nylon shoulder washers are commonly used in PCB mounting and enclosure assembly.
What length should I choose?
Select the length based on the thickness of the panel or spacing required between components.