How to find the right Hardware Washers AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Hardware Washers
- Function first
- Flat or square washers spread load. Belleville and wave washers add spring preload. Sealing washers stop leaks. Shoulder and rigid insulation washers isolate electrically. Cup and countersunk washers finish a visible screw. Most bad purchases come from buying the wrong washer type for the job, not a poor example of the right type.
- Inner diameter matched to fastener
- Buy by nominal bolt size, such as 1/4 in or M6. The hole is slightly larger than the thread, and the washer must not slop or bind. An oversized hole lets the washer shift off-center and lose bearing area.
- Outer diameter and thickness for the substrate
- Soft wood, sheet metal and plastics need a larger OD and a thicker washer than steel-on-steel joints. Pull-through and crushing happen at the washer edge, not at the bolt.
- Material matched to the fastener
- Use stainless with stainless and galvanized with galvanized. Use 316 stainless for salt exposure. Mixing metals causes galvanic corrosion, and the washer or bolt fails early.
- Hardness matched to bolt grade
- High-strength bolts, such as Grade 8, Class 10.9 and structural bolts, need hardened washers. Soft washers yield under high clamp load, and the joint loosens.
Brands that matter
- Hillman: Broad hardware-aisle range of flat, fender, finishing and specialty washers.
- Bolt Dropper: Bulk packs of common stainless and zinc washers.
- Simpson Strong-Tie: Structural plate and bearing washers for wood framing.
- Smalley: Wave springs and wave washers.
- Schnorr: Disc springs and Belleville washers.
- Essentra Components: Nylon, insulating and shoulder washers.
What to avoid
- Unbranded mixed assortments with no material or size standard stated
- Plain zinc-plated washers outdoors or in wet locations
- Soft washers under high-strength bolts
Questions
Do I need a lock washer?
Usually not on a properly torqued joint. Under vibration, Belleville or conical washers or thread locker generally hold preload better than split washers.