💿 Washer Size Selector
Find the correct washer for your bolt or screw
Washer Selection
When to Use Washers:
• Flat Washers: Distribute load, protect surface, prevent pull-through
• Lock Washers: Prevent loosening from vibration
• Fender Washers: Large bearing surface for thin or soft materials
• Finishing Washers: Decorative applications, clean appearance
Recommended Washer Specifications
Washer Dimensions
Common Washer Types
Flat Washer
Standard, distributes load evenly
Split Lock
Prevents loosening from vibration
Tooth Lock
Bites into surface, high resistance
Fender Washer
Extra large OD for thin materials
Finishing Washer
Decorative, countersunk head
Neoprene Washer
Sealing, vibration dampening
Flat Washer Dimensions (USS Standard)
| Bolt Size | Inside Diameter (ID) | Outside Diameter (OD) | Thickness |
|---|---|---|---|
| #4 | 0.125" | 0.375" | 0.032" |
| #6 | 0.156" | 0.438" | 0.049" |
| #8 | 0.188" | 0.500" | 0.049" |
| #10 | 0.219" | 0.562" | 0.049" |
| 1/4" | 0.281" | 0.734" | 0.065" |
| 5/16" | 0.344" | 0.875" | 0.083" |
| 3/8" | 0.406" | 1.000" | 0.083" |
| 1/2" | 0.531" | 1.375" | 0.109" |
| 5/8" | 0.656" | 1.750" | 0.134" |
| 3/4" | 0.812" | 2.000" | 0.148" |
Fender Washer Dimensions
| Bolt Size | Inside Diameter | Outside Diameter |
|---|---|---|
| #6 | 0.156" | 0.750" |
| #8 | 0.188" | 1.000" |
| #10 | 0.219" | 1.000" |
| 1/4" | 0.281" | 1.250" |
| 5/16" | 0.344" | 1.500" |
| 3/8" | 0.406" | 1.750" |
| 1/2" | 0.531" | 2.000" |