Square Head Bolts
Square head bolts are a type of fastener with a square-shaped head that is designed to be tightened or loosened using a wrench. These bolts are known for their distinctive head shape, which provides a large gripping surface for the wrench, making them suitable for applications where high torque is required.
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Stainless Steel Square Head BoltsDetailDimension Table
Commodity: Stainless Steel Square Head Bolts
Material: Made from 304 stainless steel, these screws have good chemical resistance and may be mildly magnetic. They are also known as A2 stainless steel.
Head Type: Square head.
Length: is measured from under the head.
Thread Type: Coarse Thread, Fine Thread.Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.
Appliation: About half the strength of medium-strength screws, these screws can be used for light duty fastening applications, such as securing access panels. Large flat sides make them easy to grip with a wrench and keep them from rotating in square holes.
Standard: Screws that meet ASME B1.1, ASME B18.2.1, comply with standards for dimensions.Screw Thread 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 d d 0.25 0.3125 0.375 0.4375 0.5 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 PP UNC 20 18 16 14 13 11 10 9 8 7 7 6 6 ds max 0.26 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531 min 0.237 0.298 0.36 0.421 0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.47 s Nominal Size 3/8 1/2 9/16 5/8 3/4 15/16 1-1/8 1-5/16 1-1/2 1-11/16 1-7/8 2-1/16 2-1/4 max 0.375 0.5 0.562 0.625 0.75 0.938 1.125 1.312 1.5 1.688 1.875 2.062 2.25 min 0.362 0.484 0.544 0.603 0.725 0.906 1.088 1.269 1.45 1.631 1.812 1.994 2.175 e max 0.53 0.707 0.795 0.884 1.061 1.326 1.591 1.856 2.121 2.386 2.652 2.917 3.182 min 0.498 0.665 0.747 0.828 0.995 1.244 1.494 1.742 1.991 2.239 2.489 2.738 2.986 k Nominal Size 11/64 13/64 1/4 19/64 21/64 27/64 1/2 19/32 21/32 3/4 27/32 29/32 1 max 0.188 0.22 0.268 0.316 0.348 0.444 0.524 0.62 0.684 0.78 0.876 0.94 1.036 min 0.156 0.186 0.232 0.278 0.308 0.4 0.476 0.568 0.628 0.72 0.812 0.872 0.964 r max 0.03 0.03 0.03 0.03 0.03 0.06 0.06 0.06 0.09 0.09 0.09 0.09 0.09 min 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.03 b L≤6 0.75 0.875 1 1.125 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 L＞6 1 1.125 1.25 1.375 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5 -
Stainless Steel Square Head Bolts ManufacturerDetailDimension Table
Commodity: Stainless Square Head Bolts
Material: Made from 304 stainless steel, these screws have good chemical resistance and may be mildly magnetic. They are also known as A2 stainless steel.
Head Type: Square head.
Length: is measured from under the head.
Thread Type: Coarse Thread, Fine Thread.Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance.
Appliation: About half the strength of medium-strength screws, these screws can be used for light duty fastening applications, such as securing access panels. Large flat sides make them easy to grip with a wrench and keep them from rotating in square holes.
Standard: Screws that meet ASME B1.1, ASME B18.2.1, comply with standards for dimensions.Screw Thread 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 d d 0.25 0.3125 0.375 0.4375 0.5 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 PP UNC 20 18 16 14 13 11 10 9 8 7 7 6 6 ds max 0.26 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531 min 0.237 0.298 0.36 0.421 0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.47 s Nominal Size 3/8 1/2 9/16 5/8 3/4 15/16 1-1/8 1-5/16 1-1/2 1-11/16 1-7/8 2-1/16 2-1/4 max 0.375 0.5 0.562 0.625 0.75 0.938 1.125 1.312 1.5 1.688 1.875 2.062 2.25 min 0.362 0.484 0.544 0.603 0.725 0.906 1.088 1.269 1.45 1.631 1.812 1.994 2.175 e max 0.53 0.707 0.795 0.884 1.061 1.326 1.591 1.856 2.121 2.386 2.652 2.917 3.182 min 0.498 0.665 0.747 0.828 0.995 1.244 1.494 1.742 1.991 2.239 2.489 2.738 2.986 k Nominal Size 11/64 13/64 1/4 19/64 21/64 27/64 1/2 19/32 21/32 3/4 27/32 29/32 1 max 0.188 0.22 0.268 0.316 0.348 0.444 0.524 0.62 0.684 0.78 0.876 0.94 1.036 min 0.156 0.186 0.232 0.278 0.308 0.4 0.476 0.568 0.628 0.72 0.812 0.872 0.964 r max 0.03 0.03 0.03 0.03 0.03 0.06 0.06 0.06 0.09 0.09 0.09 0.09 0.09 min 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.03 b L≤6 0.75 0.875 1 1.125 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 L＞6 1 1.125 1.25 1.375 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5
