Gibraltar Z9421 C Washer 1/4 Inch Bolt Black Oxide Steel

Product Description

The GIBRALTAR Z9421 is a C washer designed for use with 1/4 inch bolts in demanding fastener applications. Manufactured from Grade 12L14 case hardened steel with a black oxide finish, this washer delivers corrosion resistance and surface hardness suited for industrial and mechanical assembly work. It measures 9/32 inch (0.2813 inches) inside diameter, 1 inch outside diameter, and 1/4 inch (0.2500 inches) thick. The black oxide coating reduces light reflection and provides a degree of mild corrosion protection in dry or low-moisture environments. Trades professionals, maintenance technicians, and assembly workers use this washer where a C-style open slot configuration is required for quick installation or removal without full bolt disassembly.

The Z9421 C washer is suited for general industrial fastening, machinery maintenance, and structural assembly tasks where a 1/4 inch bolt size is specified. The open-slot C profile allows the washer to be slid on or off a fastener shaft without removing the nut or bolt head entirely, saving time during field repairs or equipment servicing. It is appropriate for use in both light commercial and industrial settings where Grade 12L14 steel hardness and black oxide finish meet the application requirements.

Key Features

• C-slot profile allows installation and removal without full bolt disassembly
• Grade 12L14 case hardened steel construction for surface hardness and durability
• Black oxide finish provides mild corrosion resistance and low-reflectance surface
• Inside diameter of 9/32 inches fits standard 1/4 inch bolt sizes
• 1 inch outside diameter distributes load across a wider bearing surface
• 1/4 inch thickness provides stable seating under fastener load

Compatibility

Designed for use with 1/4 inch and Number 10 bolt sizes. The 9/32 inch inside diameter accommodates standard 1/4 inch fastener shafts. Verify clearance requirements before installation in precision assemblies.

Installation Notes

Installation of C washers is typically performed by maintenance technicians, millwrights, or mechanical assemblers using standard hand tools. Power down or de-energize any equipment before servicing fastened assemblies. The open-slot design allows lateral insertion onto a fastener shaft, but ensure the slot is oriented away from primary load direction to maintain proper bearing contact. Do not use C washers as a substitute for full-round washers in high-vibration or safety-critical structural connections.