Description
The 304/316 Stainless Steel ANSI B18.21.1 Spring Washer is a helical spring lock washer designed to prevent fastener loosening under vibration, torque, and dynamic stress. Manufactured in compliance with the ANSI/ASME B18.21.1 standard, this washer delivers reliable performance, exceptional durability, and superior corrosion resistance. Its unique split-ring design creates a continuous, active preload (tension) in the assembly, ensuring long-term reliability and joint integrity in demanding industrial, marine, and construction applications. The ANSI B18.21.1 Spring Washer is available in 304 OR 316 stainless steel grades, making it ideal for mechanical, marine, and industrial applications requiring strength and stability in harsh environments.
Features & Benefits
- Corrosion Resistance: Made from 304 or 316 stainless steel to ensure excellent resistance to rust, oxidation, and chemical exposure.
- Helical Split-Ring Design: Increases vertical tension and provides a strong, reliable locking mechanism to resist loosening due to vibration.
- Deep, Uniform Force: The design ensures a fine fit and a stable, high-tension grip, enhancing the security of the fastener assembly.
- High Hardness: Maintains structural integrity and resists deformation, ensuring the washer's locking function is effective over time.
Specification
|
Thread specification -d |
d |
dc |
h |
h |
||
|
Nominal |
max |
min |
max |
min |
min |
|
|
2# |
0.096 |
0.094 |
0.088 |
0.175 |
0.02 |
0.035 |
|
3# |
0.099 |
0.107 |
0.101 |
0.195 |
0.025 |
0.04 |
|
4# |
0.112 |
0.12 |
0.114 |
0.209 |
0.025 |
0.04 |
|
5# |
0.125 |
0.133 |
0.127 |
0.236 |
0.031 |
0.047 |
|
6# |
0.138 |
0.148 |
0.141 |
0.25 |
0.031 |
0.047 |
|
8# |
0.164 |
0.174 |
0.167 |
0.293 |
0.04 |
0.055 |
|
10# |
0.19 |
0.2 |
0.193 |
0.334 |
0.047 |
0.062 |
|
12# |
0.216 |
0.227 |
0.22 |
0.377 |
0.056 |
0.07 |
|
1/4″ |
0.25 |
0.26 |
0.252 |
0.487 |
0.062 |
0.109 |
|
5/16″ |
0.3125 |
0.322 |
0.314 |
1.583 |
0.078 |
0.125 |
|
3/8″ |
0.375 |
0.385 |
0.377 |
0.68 |
0.094 |
0.141 |
|
7/16″ |
0.4375 |
0.45 |
0.44 |
0.776 |
0.109 |
0.156 |
|
1/2″ |
0.5 |
0.512 |
0.5.2 |
0.869 |
0.125 |
0.171 |
|
9/16″ |
0.5625 |
0.574 |
0.564 |
0.965 |
0.141 |
0.188 |
|
5/8″ |
0.625 |
0.641 |
0.628 |
1.073 |
0.156 |
0.203 |
|
11/16″ |
0.6875 |
0.704 |
0.691 |
1.17 |
0.172 |
0.219 |
|
3/4″ |
0.75 |
0.766 |
0.753 |
1.265 |
0.188 |
0.234 |
|
13/16″ |
0.8125 |
0.832 |
0.816 |
1.363 |
0.203 |
0.25 |
|
7/8″ |
0.875 |
0.894 |
0.878 |
1.459 |
0.219 |
0.266 |
|
15/16″ |
0.9375 |
0.958 |
0.941 |
1.556 |
0.234 |
0.281 |
|
1″ |
1 |
1.024 |
1.003 |
1.656 |
0.25 |
0.297 |
|
1-1/16″ |
1.0625 |
1.087 |
1.066 |
1.751 |
0.266 |
0.312 |
|
1-1/8″ |
1.125 |
1.153 |
1.129 |
1.847 |
0.281 |
0.328 |
|
1-3/16″ |
1.1875 |
1.217 |
1.192 |
1.943 |
0.297 |
0.344 |
|
1-1/4″ |
1.25 |
1.28 |
1.254 |
2.036 |
0.312 |
0.359 |
|
1-5/16″ |
1.3125 |
1.344 |
1.317 |
2.133 |
0.328 |
0.375 |
|
1-3/8″ |
1.375 |
1.408 |
1.379 |
2.219 |
0.344 |
0.391 |
|
1-7/16″ |
1.4375 |
1.472 |
1.442 |
2.324 |
0.359 |
0.406 |
|
1-1/2″ |
1.5 |
1.534 |
1.504 |
2.419 |
0.375 |
0.422 |
|
1-5/8″ |
1.625 |
1.663 |
1.633 |
2.553 |
0.389 |
0.424 |
|
1-3/4″ |
1.75 |
1.789 |
1.758 |
2.679 |
0.389 |
0.424 |
|
1-7/8″ |
1.875 |
1.914 |
1.883 |
2.811 |
0.422 |
0.427 |
|
2″ |
2 |
2.039 |
2.008 |
2.936 |
0.422 |
0.427 |
|
2-1/4″ |
2.25 |
2.293 |
2.262 |
3.221 |
0.44 |
0.442 |
|
2-1/2″ |
2.5 |
2.543 |
2.512 |
3.471 |
0.44 |
0.442 |
|
2-3/4″ |
2.75 |
2.793 |
2.762 |
3.824 |
0.458 |
0.491 |
|
3″ |
3 |
3.304 |
3.012 |
4.047 |
0.458 |
0.491 |
