A194 2H Heavy Hex Nuts - 8 TPI Series

A194 2H Heavy Hex Nuts - 8 TPI Series

These A194 Grade 2H heavy hex nuts use the 8 thread-per-inch (8UN) series, which is the standard thread for flange bolting studs 1-1/8" and larger. If you are bolting up a large pipe flange with B7 studs, this is the nut you want. Each one is quenched and tempered for strength and has the thicker, wider heavy hex body.

Specifications

• Standard: ASTM A194 Grade 2H, heavy hex
• Thread: 8 TPI (8UN)
• Sizes: 1-1/8"-8, 1-1/4"-8, 1-3/8"-8, 1-1/2"-8, 1-3/4"-8, 2"-8, 2-1/4"-8, 2-1/2"-8
• Finish: plain steel

Common Uses

• Large-diameter B7 stud bolts on ASME flanges
• Refinery, power plant and process piping
• Heavy machinery foundations

FAQ

Why 8 TPI instead of coarse thread?
On large diameters, coarse threads become very deep and widely spaced. Flange bolting standards call for 8 threads per inch on studs 1-1/8" and up, so this nut matches most B7 studs in those sizes.

How do I tell if my stud is 8 TPI?
Count the threads over one inch with a ruler or use a thread gauge. If you count 8, use this series. If the count is lower (for example 7 on a 1-1/8" stud), you need the coarse thread A194 2H nuts.

Related: B7 Full Thread Studs | A194 2H Heavy Hex Nuts (coarse) | A563 Heavy Hex Nuts

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