Sems are machine screws and freely-rotating, captive washers manufactured as one assembly. Sems are usually used as locking screws, with the washer providing the locking action. Machine pre-assembly of these two parts may provide cost savings to the end user, especially in high-volume applications for machine screws.
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METRIC CLASS 4.8 MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, ZINC CR+3

M3-0.50 X 6 METRIC SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER CLASS 4.8 ZINC
Web Price $704.25
METRIC CLASS 4.8 MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, ZINC CR+3

M3-0.50 X 8 METRIC SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER CLASS 4.8 ZINC
Web Price $732.38
METRIC CLASS 4.8 MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, ZINC CR+3

M3-0.50 X 10 METRIC SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER CLASS 4.8 ZINC
Web Price $760.88
METRIC CLASS 4.8 MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, ZINC CR+3

M3-0.50 X 12 METRIC SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER CLASS 4.8 ZINC
Web Price $787.88
METRIC CLASS 4.8 MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, ZINC CR+3

M4-0.70 X 6 METRIC SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER CLASS 4.8 ZINC
Web Price $677.25
Diameter N/A M3 N/A M3 N/A M3 N/A M3 N/A M4
Pitch N/A Coarse
Length N/A 6 N/A 8 N/A 10 N/A 12 N/A 6
Material N/A Class 4.8
Finish N/A Zinc Plated
Package Quantity N/A 10000