hardware safetying Flashcards
1
Q
what is safetying
A
preventing fasteners from working loose die to vibration, shock etc.
2
Q
methods of safetying
A
safety wire (used once) safe t cable cotter pins (used once) tab washers locking plates (used once)
3
Q
materials of safety wire and its purpose
A
zinc coated (general safetying)
stainless steel (non-magnetic & low temp)
monel (below 700 deg f) (still high temp)
inconel (above 700 deg f)
copper (breakaway ability)
4
Q
meaning of safety wire MS 20995 - NC - 32
A
MS - military standard
20995 - standard number
NC - letter code
32 - wire diameter (1/1000”)
5
Q
ms20995 C material and usage
A
304 stainless steel, not temp. rated
6
Q
ms 20995 NC material and usage
A
Monel, up to 700 deg F
7
Q
ms20995 N material and usage
A
inconel, temp 700 deg f and above
8
Q
ms 20995 CY material and usage
A
cadmium plated copper wire, breakaway usage
