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What Size Bolts for an Engine Stand? (How to Choose Safely)

Quick answer: there isn’t one universal bolt size. The correct bolts depend on your engine’s rear block/bellhousing threads and your stand’s mounting arms/plate. The safest method is to identify the thread size and pitch on your engine, then choose a bolt with enough thread engagement and the correct grade, plus washers/spacers as needed.

Engine stands cluster: Best engine stand (US buyer guide)

Step 1: Identify your thread size and pitch

If you still have factory bellhousing bolts, you can use them as a starting point (verify length).
If you’re unsure, use a thread pitch gauge or have a parts store match it.
Do not force a bolt. Cross-threading the block is a bad day.

Step 2: Choose a safe bolt length (thread engagement)

You want solid thread engagement in the block without bottoming out.

Measure thread depth in the block holes.
Measure the thickness of the stand arm/plate plus any spacers and washers.
Select a bolt length that gives strong engagement while still tightening fully.

Tip: when in doubt, test-fit by hand and confirm the bolt tightens before the head bottoms out.

Step 3: Bolt grade and washers (don’t cheap out)

Use quality hardware. For many applications, Grade 5 or Grade 8 is used (match your comfort and load).
Use flat washers as needed so the bolt head seats well on the stand arm.
Avoid mystery bolts, mixed-thread bolts, or damaged threads.