Table of Contents
Measuring Bolts and Screws Length is measured from the point at which the head sits flat with the surface, to the tip of the threads. Hex, pan, truss, button, socket cap, and round head screws are measured from right under the head to the end of the threads.
How do you determine bolt length?
Fastener length is measured from where the material surface is assumed to be, to the end of the fastener. For fasteners where the head usually sits above the surface, the measurement is from directly under the head to the end of the fastener.
Does bolt length include head?
Does the length measurement of a bolt include the head? In most cases, when specifying the length of a headed bolt, the thickness of the bolt head is not included. For instance, if you were to order a ¾” x 24” hex head bolt, the bolt would measure 24” from under the head.
How can you tell if a bolt is metric or standard?
Telling the difference between a metric and imperial bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric.
How long should bolts be?
Many studies have found that there is a simple rule of thumb for standard pitch fasteners. The depth of a fastener should be at least two times its nominal diameter. For example a 1/4in (0.25in) fastener should be threaded at least 1/2in (0.50in) deep.
What does M8 mean on a bolt?
The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that’s slightly under 8mm which means that the bolt should fit through an 8mm hole.
What is M10 bolt in inches?
Table 3. Metric Closest Inch M8-1.25 5/16-18 (Smaller) M10-1.5 3/8-16 (Smaller) M12-1.75 1/2-13 (Larger) M14-2.0 9/16-12 (Larger).
How do you measure bolt head sockets?
Length is measured from the point at which the head sits flat with the surface, to the tip of the threads. Hex, pan, truss, button, socket cap, and round head screws are measured from right under the head to the end of the threads. Flat head screws are measured from the top of the head to the tip of the threads.
What does M14 mean on a bolt?
M14 means it is metric with a 14mm outside diameter.
How do you measure a metric bolt thread?
Metric thread sizes are specified by diameter and pitch, which is the space between threads. For the size M6 × 1 mm, the pitch is coarse; while the size M6 × 0.75 mm has a fine pitch. If you don’t know the pitch, choose coarse threads; they’re the industry standard.
How are bolts and nuts measured?
Bolts are measured in length of shank, bolt head size, width of shank (the diameter of the threaded bolt body) and the thread pitch (the size of the thread). Nuts are measured by the width of the hex shape and by their thread pitch.
How far should a bolt stick out from a nut?
Threaded fasteners, when installed and tightened, should protrude a distance of at least one thread beyond the top of the nut or plastic insert. Excessive protrusion should be avoided, particularly when necessary clearances, accessibility, and safety are important.
How many threads does a bolt need?
For nuts, the bolt or studs should be visible (extend past the end of the nut) by at least 1-1/2 threads. Of course, that’s a generic requirement to develope the “full strength” of the male threads in the bolt and female threads in the nut.
What does M12 mean?
The first half (M12), is the size measurement (metric) taken across the outside diameter of the thread (which in this case is 12mm). The second half is the thread pitch, which is the measurement of threads/inch (which in this case is 1.75).
What does 8.8 mean on a bolt?
In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.
What does M16 bolt mean?
Metric bolts are made fractionally under their stated size, for instance an M16 bolt will have a shank diameter of typically 15.97mm. This means that a 16mm bolt will fit through a 16mm hole but to allow for misalignment between parts it is common practice to drill bolt holes slightly larger.
What size is M5?
ISO Metric Machine Screw Thread Dimensions Thread Size Nominal Diameter (mm) Thread Pitch (mm) M4 4.0 0.70 M4.5 4.5 0.75 M5 5.0 0.80 M6 6.0 1.00.
What size is m14 bolt?
Metric Hex Bolt Dimensions NOMINAL SIZE (D) BODY DIAMETER ACROSS THE FLATS m10 10.00 15.73 m12 12.00 17.73 m14 14.00 20.67 m16 16.00 23.67.
What is M5 bolt?
Bolts and nuts described as M5 means they are bolts or nuts with threaded 5 mm bodies. Additional numbers in the description indicate thread pitch and length. The M series metric fasteners have standardized pitches and diameters and head wrench sizes.
How do I measure a shoulder bolt?
Size is the shoulder diameter and length is the length of the shoulder—measure length from under the head to the end of the shoulder. An additional dimension is thread size, which is always smaller in diameter than the shoulder, and ranges from 10-24 to 5/8-11 for the common sizes.
How are M10 bolts measured?
If the size is M10 x 25, that would mean that the diameter is 10 mm. Since there is no thread pitch listed, the fastener is assumed to have a coarse thread. The 25 indicated a length of 25 mm. A matching nut would be labeled M10, which also doesn’t require a thread pitch since it’s a course thread fastener.
