Spring washers digunakake kanggo nyegah loosening, flat washers ora duwe fungsi relaksasi, yaiku, flat washers mung nambah area kontak, lan spring washers bisa nyegah loosening.
Pad Flat: mung nambah area lumahing kanggo nyegah karusakan ing bagean dipasang saka landasan alus utawa kanggo mblokir bolongan.