Sirco Hand Inner Cap Nut for Steel Aluminum Wheels

Sirco inner cap nuts, also called inner wheel nuts or truck cap nuts, secure heavy-duty truck and trailer wheels to the hub. They are used on dual-wheel setups. Each nut holds the inner wheel in place, and the outer wheel then mounts over it. This product line is made for steel and aluminum wheel applications and comes in left-hand and right-hand thread versions to match each side of the vehicle.

Key Features:

• Grade 8 construction for strength in demanding commercial applications
• Yellow zinc finish for corrosion resistance
• Designed for steel or aluminum wheel mounting, depending on the variant
• Left-hand and right-hand thread options
• Many variants are listed as cross-references to common OEM and aftermarket part numbers, including Budd, Meritor, Spicer, Alcoa, Leland, Batco, Automann and others

Sirco hardware is a practical replacement choice for fleet, trucking and tire-service work where dependable wheel-attaching parts matter. Choose the child item that matches your wheel type and thread direction.