1313540 Locknut Fits Caterpillar Models

One New Aftermarket Replacement Locknut for Caterpillar (Cat) Equipment

This M8 x 1.25mm hex locknut with nylon insert is a high-frequency fastener used throughout Caterpillar (Cat) construction and industrial equipment. The nylon insert lock mechanism prevents loosening under vibration and load, making it suitable for a wide range of assembly and service applications across Cat machinery. Zinc-coated carbon steel construction meets ISO 898-2 Class 10 material standards.

Specifications

• Thread Size: M8 x 1.25mm (RH Coarse)
• Nut Type: Hex
• Lock Mechanism: Nylon Insert
• Drive: 13mm (0.512 in)
• Thickness: 6.76mm (0.266 in)
• Height: 7mm
• Grade: 5
• Coating: Zinc
• Material: Carbon Steel with Nylon Insert
• Material Standard: ISO 898-2 Class 10

Compatible Models

Caterpillar Articulated Trucks: D250E II, D300E II, D350E II, D400E II

Caterpillar Integrated Toolcarriers: IT14G, IT14G2, IT28G, IT38H, IT62G, IT62H

Caterpillar Motor Graders: 120K, 120K 2, 12K, 140K, 140K 2, 160K

Caterpillar Skid Steer Loaders / Compact Track Loaders: 216, 216B, 216B3, 226B, 226B3, 228, 232B, 236, 236B, 236B3, 236D, 242B, 242B3, 242D, 246C, 246D, 247, 247B, 247B3, 248, 252B, 252B3, 256C, 257B, 257B3, 257D

Caterpillar Wheel Tractor-Scrapers: 621, 621K, 623, 623K, 623K LRC, 627, 627K, 627K LRC, 631, 631K, 632, 637, 637K, 651, 657

Caterpillar Large Mining Dozers: 24M

Caterpillar Generators: SR4B, SR4BHV, XQ330

Caterpillar Truck Engines: C7

This list represents known compatible Cat models. Due to the wide use of standard M8 x 1.25mm fasteners across the Cat equipment line, additional models may also use this locknut. Verify fitment with your parts manual before ordering.

Replaces Part Number(s):

1313540, 131-3540

New aftermarket replacement part - not remanufactured, not used.