Sɛ́ nneɛma a ɛho hia wɔ mfiri nkitahodi mu no, sɛnea nneɛma a wɔde kyekyere nneɛma ho no yɛ adwuma no gyina nneɛma a wɔde di dwuma no so kɛse. Fasteners a wɔde nneɛma ahorow ayɛ no wɔ n’ankasa ahoɔden, ɛko tia nsɛe, ɛko tia ɔhyew, ne ɛka, na ɛma ɛfata ma mfiridwuma mu nneɛma ahorow.
Carbon steel ne ade a wɔtaa de yɛ nneɛma a wɔde kyekyere nneɛma esiane ne bo a ɛba fam, ahoɔden kɛse, na ɛnyɛ den sɛ wɔbɛyɛ nti. Wɔtaa de dade a ɛba fam-carbon (te sɛ C1010) di dwuma ma bolt ne nuts a ɛwɔ hɔ nyinaa, a wɔde ɔhyew-dip galvanizing anaa electroplating na ɛma nsɛe a ɛko tia no yɛ kɛse. Medium-carbon steel (te sɛ C1045) nya ahoɔden a ɛkorɔn wɔ dum ne tempering akyi na ɛfata ma mfiri structure afã horow. Wɔde carbon dade a ɛkorɔn-di dwuma wɔ nnwuma titiriw a ɛhwehwɛ sɛ ɛyɛ den kɛse, nanso ɛda ahoɔden a ɛba fam adi.
Wɔde dade a wɔde afrafra a wɔde nneɛma te sɛ chromium, molybdenum, ne nickel ka ho ma ɛyɛ kɛse no di dwuma kɛse wɔ nneɛma a ɛhwehwɛ sɛ ahoɔden ne ɔbrɛ a ɛko tia kɛse te sɛ kar ne ahunmu. Sɛ nhwɛso no, 40Cr dade, bere a wɔadum na wɔayɛ no hyew akyi no, ɛda ahoɔden a ɛkyɛn so adi na ɛko tia ɔsɛe na wɔtaa de di dwuma wɔ fasteners a wɔde yɛ engine ne mfiri a emu yɛ duru mu.
Dade a ɛnyɛ den agye din sɛ ɛko tia nsɛe na wɔakyekyɛ mu titiriw ayɛ no ahorow abiɛsa: austenitic (te sɛ 304 ne 316), martensitic, ne ferritic. 304 wɔde dade a ɛnyɛ den di dwuma kɛse wɔ aduan ne nnuruyɛ mu esiane sɛ ɛko tia nsɛe ne sɛnea ɛyɛ yiye nti. 316 dade a ɛnyɛ den, a molybdenum wom, de ma chloride a ɛko tia nsɛe a ɛkɔ anim na ɛfata ma po mu nneɛma a atwa yɛn ho ahyia. Martensitic stainless steel (te sɛ 410) ma ahoɔden ne nsɛe a ɛkari pɛ na wɔtaa de di dwuma wɔ nnwinnade a wɔde twa ne bearing fasteners mu.
Dadeɛ a ɛnyɛ -dadeɛ te sɛ aluminium, kɔbere, ne titanium afrafra nso wɔ dwumadie pɔtee bi. Aluminium alloy fasteners yɛ hare, nsɛe-resistant, na ɛyɛ conductive kɛse, ɛma ɛfata ma ahunmu ne ɛlɛtrɔnik mfiri. Kɔbere a wɔde afra (te sɛ kɔbere) ma ɛma anyinam ahoɔden tumi fa mu yiye na ɛko tia nsɛe na wɔtaa de di dwuma wɔ anyinam ahoɔden nkitahodi mu. Titanium afrafra fasteners ma ahoɔden a ɛkorɔn, ɛkorɔn-ɔhyew a ɛko tia, ne nsɛe, nanso ne bo yɛ den na wɔde di dwuma titiriw wɔ wimhyɛn ne nnuruyɛ mfiri a ɛkorɔn-end.
Sɛ yɛbɔ no mua a, nneɛma a wɔde kyekyere nneɛma a wɔpaw no hwehwɛ sɛ wosusuw mfiri ahorow, nneɛma a atwa yɛn ho ahyia a ɛne ne ho hyia, ne ɛka-a ɛyɛ papa ho yiye na ama wɔadi nnwuma ahorow ahiade ho dwuma.
