How are bolts sizes?
A bolt’s size is classified based on a number of dimensions, namely the bolt’s diameter, length of shank, thread pitch, grade, thread length and head size. Bolts can me specified in metric using millimeters, but the standard, internationally-recognized descriptions of bolt sizes are in inches.
What do the numbers on a bolt size mean?
The number 1 or number larger than one, or number one or number larger than one followed by a fraction, is the diameter of the shaft. The number following the hyphen is the number of threads per inch; that is, the number of threads on the shaft itself, per inch of shaft length. Same as for smaller parts.
How do you read a bolt size chart?
Read the first letter of the size. This the largest diameter: the measurement of the screw on the thread. Unified screw diameters are measured in inches — lowest to highest as 0 to 10. Measurements equal 0.060″ + 0.013″ x measured diameter.
What size is a AN4 bolt?
1/4-28
AN4 bolts have a 1/4-28 UNF thread. All sizes of AN4 bolts have a 0.469 inch thread length (except AN4-3A, which has 0.406 inch thread length).
What size is M8?
13 mm
Standard metric spanner and allen key sizes.
| Size | Spanner | Allen Key |
|---|---|---|
| M8 | 13 mm | 6 mm |
| M10 | 17 mm | 8 mm |
| M12 | 19 mm | 10 mm |
| M16 | 24 mm | 14 mm |
What is a NAS bolt?
NAS bolts comply with the National Aerospace Standard and are commonly used for high technology systems. NAS bolts are necessary for high strength applications and consist of a fine-threaded, dimple headed hex bolt. Material markings for NAS bolts are the same as AN bolt, except they may be either raised or recessed.
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 is M18 bolt?
Hex Head Bolts DIN 931 (ISO 4014) M18 in Bright Zinc Plated (BZP) Class 8 high tensile steel. Popularly used in all assemblies, a standard hex bolt is a staple across the world. Manufactured to ISO 4014 or DIN 931, and therefore includes an unthreaded section of the shaft.
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