Secure, authentic, and built to endure legacy motor installations, this A.O. Smith / Century / Regal Beloit thru-bolt is a genuine OEM replacement designed for durability in residential, commercial, and industrial applications. With a 12" overall length and a 2" threaded end in 10-32 size, it’s tailored for older equipment that still relies on dependable through-bolt mounting to keep motors safely aligned and performing reliably.

Genuine OEM thru-bolt: a trusted link to decades of motor reliability

Manufactured by A.O. Smith and carried through the Century family and Regal Beloit lineage, these thru-bolts reflect a long-standing industry standard. Even though the part is discontinued by the original manufacturer, it remains a critical component for service, repair, and restoration of legacy motors. Choosing authentic hardware helps preserve original tolerances, fit, and load distribution that aftermarket parts often cannot guarantee.

Key specifications at a glance

• Thread size: 10-32
• Overall length: 12 inches
• Threaded end length: 2 inches
• Application: motor mounting through-bolt for A.O. Smith / Century / Regal Beloit motors
• Part lineage: A.O. Smith Electric Motors / Century Electric Motors, now under Regal Beloit ownership

Why this part matters for your project

In legacy systems, mounting hardware isn’t a get-it-now-afterthought — it’s a critical component that ensures vibration damping, alignment, and secure attachment under load. This thru-bolt delivers the precise dimensions and threading that legacy motors were designed around, helping you avoid compatibility issues that can arise with generic replacements. Its 12" length and 2" threaded end are specifically chosen to fit through many frame configurations and motor mounting brackets used in older equipment, supporting dependable operation over the motor’s service life.

Use cases and scenarios

• Replacing a worn or failed thru-bolt on legacy A.O. Smith or Century motors during routine maintenance or major overhauls
• Restoring older equipment in commercial facilities, industrial plants, or residential HVAC systems where authentic OEM hardware was originally specified
• Retrofit projects that require a precise 10-32 thread and extended through-bolt length to achieve proper mounting depth

How this part helps your project compared to alternatives

Authentic OEM hardware maintains the original fit, tolerance, and load distribution designed by the motor’s engineers. While aftermarket options can vary in thread quality, length, and finish, this thru-bolt is engineered to align with the established mounting geometry of A.O. Smith and Century motors, reducing installation guesswork and post-install vibration issues. It’s a reliable choice for long-term performance in environments where motor reliability is non-negotiable.

Practical tips for selection and installation

• Verify that your motor model and mounting flange expect a 10-32 thru-bolt with a 12" overall length and a 2" threaded portion before ordering.
• Pair this bolt with the appropriate nuts and washers designed for through-bolt mounting to ensure proper preload and secure seating.
• If you’re refurbishing older equipment, keep a small stock of authentic OEM fasteners on hand to minimize downtime during service windows.

Whether you’re maintaining a legacy fleet of motors or completing a careful restoration, this A.O. Smith / Century / Regal Beloit thru-bolt provides the authentic fit, proven geometry, and reliability that legacy equipment was built to last. Reinforce your motor replacement or repair with the original hardware trusted by technicians for decades.