Difference between revisions of "Threaded Fasteners"
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=Screw Types= | =Screw Types= | ||
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| − | + | {| class="wikitable" | |
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| − | + | |Photo | |
| − | + | |Common Names | |
| − | + | |Description | |
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| − | + | |<br /> | |
| + | |Hex head | ||
| + | |<br /> | ||
| + | |- | ||
| + | |<br /> | ||
| + | |Twelve point | ||
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| + | |- | ||
| + | |<br /> | ||
| + | |Socket head | ||
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| + | Allen® head | ||
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| + | |- | ||
| + | |<br /> | ||
| + | |Shoulder screw | ||
| + | |<br /> | ||
| + | |- | ||
| + | |<br /> | ||
| + | |Set screw | ||
| + | |<br /> | ||
| + | |- | ||
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| + | |Quarter turn | ||
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| + | [https://www.southco.com/en-us/product/hierarchy.html?hid=7345 DZUS® fastener]<ref>https://en.wikipedia.org/wiki/Dzus_fastener</ref> | ||
| + | |A specialty fastener that allows quick installation and removal of [[Body Panel|body panels]]. | ||
| + | |} | ||
=Nut Types= | =Nut Types= | ||
Revision as of 19:07, 23 May 2020
Threaded fasteners used in FS are most typically made of steel but are sometimes also made of stainless, titanium, or aluminum.
Contents
Standards
There are two main threaded fastener standards: metric and inch. Within these two categories lay additional standards set by various organisations. These standards may are often intercompatible but can differ in head size, strength, alloy, coating, pitch, and local avaliability.
Metric
Metric screws are listed in the following way:M6x25 x 1mm Class 8.8. The M6 referes to the major diameter being 6mm, 25: the shaft length is 25mm, and the pitch is 1 thread per 1mm. A class 8.8 bolt is a medium strength steel bolt with a tensile strength of about 800MPa and about 80% of that being the yield strength.
ISO
DIN
JIS
Inch
Inch screws are listed in the following way:1/4-20 x 1 Grade 5. The 1/4 is the major diameter of 1/4in, a thread pitch of 20 threads per inch, and a length of 1in. A grade 5 bolt is a medium strength steel bolt with a tensile strength of about _ksi and a yield strength of _ksi.
SAE
[grades, charts, etc...]
AN
Screw Types
| Photo | Common Names | Description |
| Hex head | ||
| Twelve point | ||
| Socket head
Allen® head |
||
| Shoulder screw | ||
| Set screw | ||
| Quarter turn | A specialty fastener that allows quick installation and removal of body panels. |
Nut Types
Deez Nutz
Hex Nut
Weld Nut / Riv-Nut
Locknut
Locknuts resist loosening. Other methods can be used to resist loosening: lock washers, safety wire, locking adhesive, or design.
Jam Nut
Nylon Lock
Distorted Thread
Jet/K Nut
great in high temperature environments such as brakes or exhaust.
Castle Nut
Threaded Insert
Fastener Characteristics (how to choose)
- Initial Tensioning
- Initial Tightening Force
- Brings bolt close to "proof load"
- Deformation of threads (pic)
- Maintenance schedule
Torque Tension Calcs
Further Reading
- NASA Fastener Design Manual
- Carroll Smith's Screw to Win
