7Y3557 Bolt for Caterpillar Equipment

7Y3557 is a hex head bolt used in Caterpillar engine and excavator equipment, including selected 3056E, 3116, 3126, 3126B, 3306, C-9 and C7 engine applications, as well as 322B L, 322B LN and 322C excavators. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The bolt is listed in the C-Series Head Bolts category. The equipment brand specified for this part is Caterpillar; Caterpillar is identified as the manufacturer of the engines and machines on which the bolt is used.

Fitment

• Caterpillar 3056E engine and machine applications
• Caterpillar 3116 engine and machine applications
• Caterpillar 3126 engine and machine applications
• Caterpillar 3126B engine and machine applications
• Caterpillar 3306 engine and machine applications
• Caterpillar C-9 engine and machine applications
• Caterpillar C7 engine and machine applications
• Caterpillar 322B L excavator
• Caterpillar 322B LN excavator
• Caterpillar 322C excavator

The listed fitment covers Caterpillar engine and machine applications together with the specified Caterpillar excavator models. Application should be checked against the equipment model and the part number before installation, as the same machine series may contain assemblies with different fastener requirements.

Cross-reference numbers

• 7Y3557
• 7Y-3557

7Y3557 and 7Y-3557 are the two number formats provided for this bolt. The hyphenated format identifies the same part number designation shown in the product data.

Specifications

The thread specification is M16 x 2, consisting of a 16 mm nominal thread diameter and a 2 mm pitch. The supplied technical data identifies the fastener as a steel hex head bolt with a 11.9 head marking, Cat Class 11.9 material classification and zinc-flake coating.