The closest SAE size to a 24mm socket is 15/16 inch. They’re very close, but not identical, so fit can vary by fastener and wear.

• Conversions: 24mm ≈ 0.9449 in; 15/16 in = 0.9375 in (about 0.19 mm smaller).
• Best practice: Use a true 24mm socket to reduce the chance of rounding a nut or bolt.
• Fit considerations: A slightly undersized SAE socket may feel tight and may not seat fully on the flats.
• Point count: A 6-point socket tends to grip flats more securely than a 12-point at higher torque.
• Drive size: Many 24mm sockets use a 1/2-inch drive, which offers a good balance of strength and access.

They’re very close in size, but not the same. A 24mm fastener typically fits best with a 24mm socket.

• Size difference: 24mm is about 0.9449 in; 15/16 in is 0.9375 in. That’s roughly 0.0074 in (≈0.19 mm) smaller.
• Fit impact: Using 15/16 in on a 24mm fastener can feel tight and may not fully engage the flats, especially on worn hardware.
• Risk: Partial engagement can increase the chance of slipping or rounding under load.
• Tip: When possible, match metric to metric. If you’re in a pinch, proceed gently and check engagement before applying heavy torque.

They’re not close in size. A 3/4-inch socket is much smaller than a 24mm.

• Conversions: 3/4 in = 0.75 in ≈ 19.05 mm; 24mm is 24 mm. The difference is nearly 5 mm.
• Fit result: A 3/4-inch socket won’t fit over a 24mm nut or bolt head.
• Selection tip: For 24mm fasteners, choose a socket marked 24mm for proper engagement.
• Drive considerations: Many 24mm sockets are 1/2-inch drive; heavy-duty applications may use 3/4-inch drive.
• Safety: Always confirm the fastener size and use steady, controlled force to help avoid damage.

A 7/8-inch socket is smaller than a 24mm and won’t fit a 24mm fastener.

• Sizes: 7/8 in = 0.875 in ≈ 22.23 mm; 24mm is 24 mm.
• Fit outcome: Because 7/8 in is about 1.77 mm smaller, it won’t go over a 24mm nut/bolt.
• Use case: A 7/8-inch socket is more comparable to a 22mm fastener, not 24mm.
• Best practice: Match the socket marking to the fastener size to help reduce rounding and slipping.
• Tool tip: Choose a 6-point socket for higher torque situations and confirm you’re using the correct drive size for your wrench.

Choose based on access and fastener length. Both styles have their place.

• Shallow sockets: Great for tight spaces where clearance is limited. They’re commonly used on flat bolt heads with little stud protrusion.
• Deep sockets: Helpful for nuts on longer studs (like suspension or wheel hardware) and when you need extra reach.
• Impact vs. chrome: Impact-rated sockets are designed for impact tools; chrome sockets are typically for hand ratchets.
• Point count: 6-point offers robust grip on flats; 12-point can speed alignment in tighter angles.
• Drive size: Many 24mm sockets use 1/2-inch drive; heavier jobs may call for larger drives.