What size wrench or spanner fits 9/16 in?

9/16 in bolt uses a 13/16 wrench or spanner, measured across the flats of the hex head.

What is the torque for 9/16 in?

A typical tightening torque for 9/16 in bolt in Grade 5 on dry threads is about 150 Nm (110.6 ft·lb). Always confirm against the manufacturer spec for important joints.

What thread pitch and tap drill does 9/16 in use?

9/16 in bolt has a thread pitch of 12 TPI (threads per inch) and uses a 31/64 (12.3 mm) tap drill, with a 19/32 clearance hole.

What is 9/16 in used for?

9/16 in is commonly used in heavy structural, machinery. It is one of the most popular sizes in its category.

What is the closest metric size to 9/16 in?

The closest metric size to 9/16 in is approximately ~M14, though they are not exactly interchangeable.

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9/16 in bolt size

13/16 wrench

across-flats spanner / socket size for 9/16 in

9/16 in bolt — Heavy structural, machinery.

Full specification

System	Imperial UNC
Nominal diameter	9/16 in (0.5625 in / 14.29 mm)
Thread pitch	12 TPI
Wrench / spanner (across flats)	13/16
Tap drill	31/64 (12.3 mm)
Clearance hole	19/32
Common grade / class	Grade 5
Typical torque	150 Nm (110.6 ft·lb)
Closest other-system size	~M14

🔧 Torque unit converter

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

Pre-filled with the typical torque for 9/16 in (Grade 5, dry). Edit any field to convert.

⚠️ Torque values here are general references for Grade 5 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 9/16 in

Heavy structural, machinery.

A 31/64 drill is the standard tap drill for 9/16 in-12 UNC thread. The standard clearance hole is 19/32.

9/16 in is part of the Unified National Coarse (UNC) thread series, defined in ASME B1.1. The wrench size 13/16 is measured across the flats of the hex head.

Common applications

9/16 in bolts are widely used in:

Heavy structural, 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 9/16 in is Grade 5. This indicates:

Grade 5: Medium carbon steel, quenched and tempered
Tensile strength: 120,000 PSI
Yield strength: 92,000 PSI
Common coatings: Zinc plated, hot-dip galvanized, or plain

Frequently asked questions

What size wrench or spanner fits 9/16 in?: 9/16 in bolt uses a 13/16 wrench or spanner, measured across the flats of the hex head.
What is the torque for 9/16 in?: A typical tightening torque for 9/16 in bolt in Grade 5 on dry threads is about 150 Nm (110.6 ft·lb). Always confirm against the manufacturer spec for important joints.
What thread pitch and tap drill does 9/16 in use?: 9/16 in bolt has a thread pitch of 12 TPI (threads per inch) and uses a 31/64 (12.3 mm) tap drill, with a 19/32 clearance hole.
What is 9/16 in used for?: 9/16 in is commonly used in heavy structural, machinery. It is one of the most popular sizes in its category.
What is the closest metric size to 9/16 in?: The closest metric size to 9/16 in is approximately ~M14, though they are not exactly interchangeable.