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.
Request Information Search by Specification
Unit of Measure
Items
MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, EXTERNAL LOCK WASHER, ZINC CR+3 (INCH)

#4-40 X 1/4 SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER ZINC
Web Price $961.80
MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, EXTERNAL LOCK WASHER, ZINC CR+3 (INCH)

#4-40 X 3/8 SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER ZINC
Web Price $720.56
MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, EXTERNAL LOCK WASHER, ZINC CR+3 (INCH)

#4-40 X 1/2 SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER ZINC
Web Price $889.88
MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, EXTERNAL LOCK WASHER, ZINC CR+3 (INCH)

#4-40 X 5/16 SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER ZINC
Web Price QUOTE
MACHINE SCREW, PAN HEAD PHILLIPS, SEMS, EXTERNAL LOCK WASHER, ZINC CR+3 (INCH)

#4-40 X 5/8 SEM PHILLIPS PAN HEAD W/ EXTERNAL TOOTH LOCK WASHER ZINC
Web Price $650.48
Diameter N/A #4
Pitch N/A Coarse
Length N/A 1/4 N/A 3/8 N/A 1/2 N/A 5/16 N/A 5/8
Material N/A Carbon Steel
Finish N/A Zinc Plated
Package Quantity N/A 40000 N/A 25000 N/A 25000 N/A 25000 N/A 20000