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These #4 medium split lock washers are made of zinc-plated steel and are designed to prevent nuts and bolts from loosening due to vibration or movement
The screws are partially threaded
a 2 1/2-inch length
it features a 1/2-13 thread size and a 1 1/2-inch length
these wing nuts are compatible with a wide range of bolts and screws
B1/2-13 x 1 1/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR LSW These #4 medium split lockB1 2 13 x 1 1 4 MS90728 is an Alloy Steel B1821 Coarse Cap Screw that meets the requirements of ASTM A354BD. It has a diameter of 1 2 inch, a length of 1 1 4 inches, and is zinc plated with a yellow chromate finish. This cap screw is commonly used in applications where high strength and corrosion resistance are required. It is DFAR compliant, meaning it meets the requirements of the Defense Federal Acquisition Regulation Supplement.
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