What size wrench or spanner fits #10-24?

#10-24 bolt uses a 3/8 wrench or spanner, measured across the flats of the hex head.

What is the torque for #10-24?

A typical tightening torque for #10-24 bolt in Grade 2 on dry threads is about 5.5 Nm (4.06 ft·lb). Always confirm against the manufacturer spec for important joints.

What thread pitch and tap drill does #10-24 use?

#10-24 bolt has a thread pitch of 24 TPI (threads per inch) and uses a #21 (4.0 mm) tap drill, with a 13/64 clearance hole.

What is #10-24 used for?

#10-24 is commonly used in electronics, small machinery. It is one of the most popular sizes in its category.

What is the closest metric size to #10-24?

The closest metric size to #10-24 is approximately ~M5, though they are not exactly interchangeable.

Home › Imperial / SAE Bolts › #10-24

#10-24 bolt size

3/8 wrench

across-flats spanner / socket size for #10-24

#10-24 bolt — Electronics, small machinery.

Full specification

System	Imperial UNC
Nominal diameter	#10-24 (0.19 in / 4.83 mm)
Thread pitch	24 TPI
Wrench / spanner (across flats)	3/8
Tap drill	#21 (4.0 mm)
Clearance hole	13/64
Common grade / class	Grade 2
Typical torque	5.5 Nm (4.06 ft·lb)
Closest other-system size	~M5

🔧 Torque unit converter

Newton-metres (Nm) Foot-pounds (ft·lb) Inch-pounds (in·lb)

Pre-filled with the typical torque for #10-24 (Grade 2, dry). Edit any field to convert.

⚠️ Torque values here are general references for Grade 2 on clean, dry threads. Lubrication, coatings, and the joint material change the figure significantly. For structural, automotive, or safety-critical work, always use the torque specified by the manufacturer or engineer.

About #10-24

Electronics, small machinery.

A #21 drill is the standard tap drill for #10-24-24 UNC thread. The standard clearance hole is 13/64.

#10-24 is part of the Unified National Coarse (UNC) thread series, defined in ASME B1.1. The wrench size 3/8 is measured across the flats of the hex head.

Common applications

#10-24 bolts are widely used in:

Electronics, small machinery
General machinery and equipment assembly
Automotive components and repairs
Structural connections (when specified by engineer)
Industrial maintenance and repair

Material and grade information

The typical grade for #10-24 is Grade 2. This indicates:

Grade 2: Low carbon steel
Tensile strength: 50,000 PSI
Yield strength: 30,000 PSI
Common coatings: Zinc plated, hot-dip galvanized, or plain

Frequently asked questions

What size wrench or spanner fits #10-24?: #10-24 bolt uses a 3/8 wrench or spanner, measured across the flats of the hex head.
What is the torque for #10-24?: A typical tightening torque for #10-24 bolt in Grade 2 on dry threads is about 5.5 Nm (4.06 ft·lb). Always confirm against the manufacturer spec for important joints.
What thread pitch and tap drill does #10-24 use?: #10-24 bolt has a thread pitch of 24 TPI (threads per inch) and uses a #21 (4.0 mm) tap drill, with a 13/64 clearance hole.
What is #10-24 used for?: #10-24 is commonly used in electronics, small machinery. It is one of the most popular sizes in its category.
What is the closest metric size to #10-24?: The closest metric size to #10-24 is approximately ~M5, though they are not exactly interchangeable.