Lock In Torque on Every Cummins ISX Build with the ATC24MMISX-A 24 mm Head/Main Bolt Socket

Head gaskets and main bearing caps on Cummins ISX engines are unforgiving—if your torque and angle are off, you risk premature failures, warped decks, and expensive comebacks. The ATC24MMISX-A Heavy Duty Head / Mainbolt Socket is purpose-built to handle these critical fasteners. Sized at 24 mm, 5″ long, and rated for serious torque, it replaces Cummins 3165161 and supersedes 3163484 in many applications, giving diesel techs a tough, reliable tool for every ISX in the shop.

Why a Dedicated ISX Head Bolt Socket Matters

Cummins ISX head and main bolts are torqued in precise stages with angle turns at extremely high load. Using a generic, short socket can twist, flex, or even crack under load—and small variations compound into uneven clamping force. The ATC24MMISX-A is designed to:

• Deliver full-contact 24 mm drive on ISX head and main bolt hexes
• Handle high-torque passes with less torsional flex
• Work perfectly with ¾″ drive torque + angle systems
• Match or exceed OEM durability at a working-shop price

Built to Replace Cummins 3165161 (and Supersede 3163484)

The ATC24MMISX-A is functionally equivalent to Cummins tool number 3165161 and is used in place of 3163484 on many ISX applications. That means:

• No guessing—if your service info calls for 3165161, this socket fits the job
• 24 mm size and 5″ length optimized for ISX head and main bolt access
• ¾″ drive fits your standard torque wrenches and impact equipment

Key Features for Heavy-Duty ISX Work

• 5″ overall length – plenty of clearance around cam boxes, frame rails, and crossmembers
• 24 mm 6-point head – reduces corner rounding on heavily torqued fasteners
• 90° angle markings – etched on the socket to line up rotation for torque-angle steps
• ¾″ drive – ideal for pro-grade torque wrenches and impact drivers
• Heavy-wall construction – withstands repeated use at high torque values
• Made for Cummins ISX service – designed around real-world diesel rebuild needs

Step-by-Step: Using the ATC24MMISX-A on ISX Head Bolts

1. Clean the bolt heads and surrounding deck area to prevent debris from affecting torque.
2. Attach the ATC24MMISX-A socket to your ¾″ drive torque wrench or torque + angle tool.
3. Follow the Cummins ISX tightening sequence and torque values from your service manual.
4. Use the etched 90° angle markings to accurately perform torque-angle turns in each sequence.
5. Repeat across all head or main bolts, re-checking any passes if something felt off during rotation.

Perfect For: Head Gaskets, In-Frames, and Full Rebuilds

Any time you are disturbing ISX head or main fasteners, the ATC24MMISX-A belongs in your setup:

• Head gasket replacement
• In-frame overhauls for fleets and owner-operators
• Full rebuilds on reman or performance ISX engines
• Warranty and dealer-level service work

Built for the Shop Floor, Not the Tool Drawer

This isn't a throwaway socket. ATC24MMISX-A is constructed to live in the harsh environment of real diesel shops—impact use, long torque pulls, and daily ISX service. It's the kind of tool that ends up being "that one socket everyone grabs" for Cummins jobs.

Stop Guessing on ISX Torque. Get Precision Every Time.