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.
Parameter Information
|
Brand Name |
American-Made Standard Spring washer |
|
Type |
Helical Spring Lock Washer |
|
Standard |
ANSI B18.21.1 |
|
Category |
Elastic Pad |
|
Material |
Stainless Steel (AISI 304 / AISI 316) |
|
Standard Type |
American Standard |
|
Surface Treatment |
Stainless steel washing |
|
Packaging |
Packaging bag + carton packaging |
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 |
