High-Strength Material:
They are typically forged from high-carbon, alloy steel and undergo rigorous heat treatment processes (such as induction hardening or through-hardening). This creates an extremely hard, wear-resistant outer surface while maintaining a tough, shock-absorbing core to prevent bending or breaking.
This 521-4180 pin is used for 301.6 excavator.
Related part number:
139-6383
139-6384
344-5674
3B-8489
521-4059
521-4060
521-4180
521-4181
576-4466
576-4467
578-3860
604-7159
8T-3647
8T-6869
139-6384
344-5674
3B-8489
521-4059
521-4060
521-4180
521-4181
576-4466
576-4467
578-3860
604-7159
8T-3647
8T-6869
