Thwaites Stover Nut 5/16" UNF - OEM Number: T7630

The Thwaites Stover Nut 5/16" UNF (OEM T7630) is a genuine replacement all-metal self-locking nut designed for use on a wide range of Thwaites site dumpers and construction equipment. It is used to secure mechanical, structural, hydraulic, and engine-related components where resistance to vibration-induced loosening is essential.

Manufactured to OEM specifications, this Stover-type lock nut features a deformed thread design that creates prevailing torque against the mating bolt thread. Unlike nylon insert lock nuts, all-metal Stover nuts retain their locking characteristics at higher temperatures and in harsh operating environments, making them particularly suitable for construction and plant machinery applications.

FUNCTION AND OPERATION

• Secures threaded fasteners in high-vibration environments
• Provides a self-locking action without the need for additional locking devices
• Helps prevent loosening caused by shock loading and machine vibration
• Maintains clamping force on critical assemblies
• Suitable for high-temperature applications where nylon insert nuts may be unsuitable
• Designed for demanding construction and industrial environments

TECHNICAL DETAILS

• OEM Part Number: T7630
• Type: Stover nut / all-metal self-locking nut
• Thread Size: 5/16" UNF (Unified Fine Thread)
• Function: Thread locking and fastener retention
• Application: Mechanical, structural, hydraulic, and engine assemblies
• Construction: High-strength steel
• Design: Prevailing torque all-metal lock nut
• Installation: Direct replacement for compatible 5/16" UNF fasteners

Stover nuts are widely used throughout construction, agricultural, and industrial machinery due to their excellent resistance to vibration and repeated loading conditions.

TYPICAL APPLICATIONS

Suitable for a range of Thwaites equipment, including:

• Thwaites 1 Tonne dumpers
• Thwaites 3 Tonne dumpers
• Thwaites 5 Tonne dumpers
• Thwaites 6 Tonne dumpers
• Thwaites 9 Tonne dumpers
• Thwaites Power Swivel dumpers
• Engine, chassis, hydraulic, and transmission assemblies

Similar 5/16" UNF Stover nuts are commonly used throughout plant machinery wherever secure fastening is required in vibration-prone applications.

IMPORTANT INFORMATION

Always confirm the correct OEM part number, thread size, and thread pitch before ordering, as UNF and UNC fasteners are not interchangeable. Stover nuts rely on thread deformation to create their locking action and may exhibit increased installation resistance compared to standard nuts. Although reusable in some applications, industry best practice is to replace self-locking nuts whenever their locking effectiveness is reduced or when specified by the equipment manufacturer. Using damaged or worn locking nuts can result in fastener loosening, component movement, and premature equipment wear in high-vibration operating conditions.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£27.50 for delivery before 10:30am
£20.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.