Overview
The Lawson 53987 is a Grade 8 alloy steel nylon insert lock nut designed for industrial, automotive, and mechanical applications. Manufactured to IFI Standard 100/107 and meets SAE Grade 8 strength requirements, this 7/8″-9 USS fastener combines durability with reliable locking performance.
Key Features
- Nylon insert prevents damage to bolt threads, making this lock nut ideal for applications where vibration or movement could cause fasteners to loosen
- Identified by six symmetrically spaced marks on the chamfered surface on the top of the nut or two circumferential notches on the corners of the nut
- Yellow zinc finish for corrosion resistance
- Alloy steel construction for high tensile strength
- Pack of 5 units for convenience
Technical Specifications
- Thread Size: 7/8″-9 USS (coarse thread)
- Material: Alloy Steel
- Grade: Grade 8
- Finish: Yellow Zinc
- Insert Type: Nylon
- Standards: IFI 100/107, SAE Grade 8
- Quantity: Pack of 5
Typical Applications
Use this handy lock nut to secure engine parts, fasten gears and pulleys and connect metal components in structures where vibration might occur. The Lawson 53987 is well-suited for:
- Automotive and engine assemblies
- Mechanical equipment subject to vibration
- Machinery requiring secure, vibration-resistant fastening
- Construction and structural applications
- Industrial equipment assembly
Compatibility & Replacements
Compatible With
- 7/8″-9 USS bolts and threaded studs (coarse thread)
- Standard industrial and automotive fastener assemblies
- Applications requiring Grade 8 strength fastening
Replaces / Drop-In Replacement For
- Other manufacturers’ Grade 8 nylon insert lock nuts in 7/8″-9 USS size
- Standard hex lock nuts where nylon-insert vibration locking is required
Works With
- IFI Standard 100/107 compliant fastener systems
- SAE Grade 8 specification assemblies
- Machinery and equipment designed for standard Unified fasteners
