Value Collection 99730 Grade 8 Split Lock Washer 1-1/8 in

Product Description

The VALUE COLLECTION 99730 is a Grade 8 steel split lock washer sized for 1-1/8 inch fasteners. Split lock washers apply spring tension under a bolt or nut head to resist loosening caused by vibration and dynamic loads. This washer is left uncoated, making it suitable for applications where a bare steel finish is acceptable or where a secondary coating will be applied on-site. The 99730 is used by electricians, plumbers, pipefitters, millwrights, and general contractors wherever a heavy-duty helical lock washer is required in a bolted assembly.

This washer fits 1-1/8 inch screw or bolt sizes and is manufactured to inch system dimensions. The uncoated finish is appropriate for indoor mechanical assemblies, structural connections, and equipment mounting applications where corrosion exposure is low. Grade 8 material provides high hardness and spring force retention, making it a better choice than standard Grade 2 or Grade 5 washers in high-load or high-vibration installations such as industrial equipment bases, HVAC unit mounting frames, and heavy mechanical assemblies.

Key Features

• Grade 8 steel construction delivers high hardness and strong spring-back force to resist fastener loosening
• Sized for 1-1/8 inch screw or bolt diameter fasteners
• Inside diameter range of 1.129 to 1.153 inches provides consistent fit on standard 1-1/8 inch fasteners
• Maximum outside diameter of 1.847 inches for broad bearing surface under bolt or nut head
• 0.281 inch thickness provides substantial helical spring deflection
• Uncoated finish — no plating, paint, or coating that could affect dimensional tolerances

Compatibility

Designed as an OEM-style and replacement split lock washer for use with 1-1/8 inch bolts and screws in inch-dimensioned fastener assemblies requiring Grade 8 hardness.

Installation Notes

Split lock washers are installed between the bearing surface of a bolt head or nut and the clamped material, with the split gap oriented so the sharp edges can bite into both surfaces when the fastener is torqued. Always torque fasteners to the specification called out in the equipment or structural drawings. Do not reuse split lock washers that have been fully flattened, as they will no longer provide effective locking force. General mechanical trade practice and applicable codes such as ASME or local building standards should govern torque and assembly procedures.