SEMS Screw Fasteners
SEMS fasteners are screws that come pre-assembled with a washer, which helps increase the integrity and strength of the full assembly of the mating parts. The washer is held in place by the diameter of the thread, which is larger than the hole of the washer.
The introduction of the SEMS screw has helped simplified and increased efficiencies in the manufacturing process of certain product.
Our SEMS screws can be customized to your application and industry. Please review all of our SEMS screw charts below and download the size charts.
Lock Washers For Sems
| Nominal Size or Basic Screw |
INTERNAL TOOTH | EXTERNAL TOOTH | |||||||||||||||||
| Washer Thickness |
Washer Outside Diameter |
Washer Thickness |
Washer Outside Diameter |
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| Max | Min | Max | Min | Max | Min | Max | Min | ||||||||||||
|
0.016 0.019 0.021 0.023 0.025 |
0.010 0.015 0.017 0.018 0.020 |
0.185 0.268 0.288 0.338 0.383 |
0.175 0.258 0.278 0.327 0.327 |
0.016 0.020 0.020 0.023 0.024 |
0.010 0.012 0.014 0.018 0.018 |
0.180 0.230 0.285 0.320 0.381 |
0.170 0.220 0.270 0.305 0.365 |
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| Nominal Size or Basic Screw | SPLIT LOCK | SQUARE CONICAL | ||||||||||||||
| Washer Thickness |
Washer Outside Diameter |
Washer Thickness |
Washer Outside Diameter |
|||||||||||||
| Max | Min | Max | Min | Max | Min | Max | Min | |||||||||
|
0.031 0.040 0.047 0.056 |
0.025 0.031 0.040 0.047 |
0.208 0.261 0.319 0.373 |
0.195 0.248 0.305 0.359 |
0.015 0.025 0.030 0.032 |
0.007 0.019 0.025 0.026 |
0.250 0.320 0.383 0.446 |
0.244 0.307 0.370 0.433 |
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