Why the ATC24MMISX-A 24mm Socket Is the Only Cummins ISX Head Bolt Tool You’ll Ever Need

Cummins ISX head bolt jobs are unforgiving — one wrong torque, and you’re facing a $5K+ head gasket redo. The ATC24MMISX-A 24mm socket changes that with 5″ length for deep access, 90° etched angle markings for precise turns, and ¾″ drive compatibility for impacts or wrenches. Replaces Cummins 3165161 (and 3163484). At $62, it’s the durable, no-fail tool pros swear by for head/main bolt work. Let’s break down why it’s indispensable.

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Built for ISX Torque Specs – No Guesswork

ISX head bolts demand torque to 100 ft-lbs + 90° turn for even clamping. The ATC24MMISX-A’s laser-etched 90° marks align perfectly with your wrench handle, eliminating errors. Its 5″ length clears the engine bay for comfortable access, and ¾″ drive handles impacts up to 1,000 ft-lbs without rounding. In real shops, it’s saved hours on head gasket jobs by preventing over/under-torquing, which can warp blocks or blow gaskets.

Real Shop Feedback & Torque Tips

“Used it on 6 ISX head jobs – no rounding, no slipping. The 90° mark is a lifesaver for angle turns.” – Mike, Fleet Tech.
Pro Tip: Always lube threads with Moly paste for 100 ft-lbs initial torque, then 90° – follow Cummins sequence (center-out) to avoid warping.

Specs at a Glance

Spec	Detail
SKU	ATC24MMISX-A
Size	24mm
Drive	¾″
Length	5″
Markings	90° etched
Replaces	3165161, 3163484
Price	$62.00

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Tags: cummins isx head bolt socket, atc24mmisx-a, 3165161 replacement, 24mm torque socket, isx head gasket tool, 3/4 drive socket, 90 degree angle markings, heavy duty diesel tools, engine rebuild socket, apex tool