Tá comhpháirteanna ríthábhachtacha ag teastáil ó aerárthaí míleata SAM a gcaithfidh a bheith iontaofa, buan agus éifeachtach. Is é ceann de na comhpháirteanna riachtanacha in aerárthaí imthacaí, a sholáthraíonn tairiscint réidh agus comhsheasmhach le haghaidh páirteanna rothlacha. Úsáidtear cineálacha éagsúla imthacaí in aerárthaí, ag brath ar a gcur i bhfeidhm agus a gceanglas atá beartaithe. Go ginearálta, déantar imthacaí aerárthaí a dhearadh chun oibriú faoi theocht mhór, ualaí agus luas ard, agus timpeallachtaí creimneach.
Is é ceann de na imthacaí is coitianta a úsáidtear in aerárthaí míleata ná an t-imthacaí liathróid, a chuimsíonn roinnt liathróidí ag gluaiseacht idir na rásaí istigh agus lasmuigh. Is féidir le imthacaí liathróid ardluais agus ualaí a láimhseáil agus fórsaí gathacha agus aiseach a tharchur. Úsáidtear na imthacaí seo go hiondúil sna haonaid chumhachta inneall, giarbhosca agus cúnta.
Cineál imthacaí eile atá oiriúnach d'iarratais aerárthaí míleata ná an t-imthacaí sorcóir. Mar a thugann a ainm le tuiscint, úsáideann imthacaí sorcóir rollóirí sorcóireacha in ionad liathróidí le haghaidh aistriú tairiscint. Is féidir le imthacaí sorcóir ualaí níos airde a láimhseáil agus tarchur fórsa gathacha agus aiseach níos airde a sholáthar. Úsáidtear na imthacaí seo go coitianta i gcórais fearas tuirlingthe, dromchlaí rialaithe, agus córais tarchurtha.
Úsáidtear imthacaí sorcóir barrchaolaithe go forleathan freisin in aerárthaí míleata. Tá rollóirí barrchaolaithe acu agus cuireann siad ar chumas ard-acmhainn ualaigh gathacha agus aiseach. Úsáidtear imthacaí sorcóir barrchaolaithe go coitianta sna córais rotor inneall, giarbhosca agus héileacaptair.
Chomh maith leis na cineálacha imthacaí seo, tá imthacaí speisialaithe ag teastáil ó roinnt aerárthaí ar nós imthacaí sféarúla, imthacaí irise, agus imthacaí sá. Is imthacaí féin-ailínithe iad imthacaí sféarúla agus úsáidtear iad i dromchlaí rialaithe sciatháin agus córais fearas tuirlingthe. Tacaíonn imthacaí irise le hualaí gathacha agus tá siad deartha chun teochtaí agus luasanna arda a sheasamh. Tá imthacaí sá deartha chun fórsaí aiseach a iompar agus úsáidtear iad go coitianta in innill agus tarchuir.
Ar an iomlán, ní mór do na imthacaí a úsáidtear in aerárthaí míleata na Stát Aontaithe caighdeáin dhian cáilíochta a chomhlíonadh agus dul faoi nósanna imeachta tástála agus deimhnithe dian sula gceadaítear iad le húsáid. Tá ról ríthábhachtach ag na imthacaí seo maidir le sábháilteacht, iontaofacht agus éifeachtacht aerárthaí míleata a chinntiú.
| Uimhir Pháirt Bearing | méid(mm) |
| 48290dw/48220/48220d | 127x182.562x158.75 |
| 67391dw/67322/67323d | 130.175x196.85x200.025 |
| 48393d/48320/48320d | 136.525x190.5x161.925 |
| 48680dgw/48620/48620d | 139.7x 200.025x160.34 |
| 73550d/73875/73876cd | 139.7x222.25x127 |
| NP965846/NP711787 | 150x210x190 |
| m231649d/m231610/m231610cd | 152.4x222.25x174.625 |
| 81601d/81962/81963cd | 152.4x244.475x187.325 |
| ee517060d/517117/517118xd | 152.4x298.45x228.6 |
| 46791dw/46720/46721d | 165.1x225.425x168.276 |
| 67791dgw/67720 | 177.8x247.650x192.088 |
| 82681dgw/82622/82622d | 177.8x273.05x234.947 |
| ee91700d/91112/91113xd | 177.8x285.75x222.245 |
| 94706d/94113/94114cd | 177.8x288.925x263.525 |
| Hm237545d/Hm237510/Hm237511Xd | 177.8x288.925x266.7 |
| ee280700d/281200/281201d | 177.8x304.8x233.365 |
| ee210700d/211300/211301Xd | 177.8x330.2x234.95 |
| m238849dw/m238810/m238810d | 187.325x269.875x211.138 |
| 67885dw/67820 | 190.5x266.7x188.914 |
| ee420750d/421450 | 190.5x368.3x387.35 |
| m240648dgw/m240611/m240611d | 198.438x284.162x225.425 |
| ee132081d/132125/132126d | 203.2x317.5x209.55 |
| 93580d/93520/93520Xd | 203.2x317.5x222.247 |
| 93800dgw/93125/93127cd | 203.2x317.5x266.7 |
| 93801d/93125 | 203.2x317.5x336.55 |
| 8976d/8920/8920Xd | 203.352x298.45x174.628 |
| 67986dgw/67920/67921d | 206.375x282.575x190.5 |
| 96851dw/96140/96140cd | 215.9x355.6x269.875 |
| lm742749dw /lm742714/ lm742714d | 215.9x288.925x177.8 |
| 9974dw /9920 /9920d | 216.103x330.2x269.875 |
| nP881565/ nP552013 | 220 34x303.5 303.5x398 |
| m244249dgw /m244210 /m244210cd | 220.662x314.325x239.712 |
| lm245149dgw/ lm245110/ lm245110d | 228.6x311.15x200.025 |
| ee130901d /131400/ 131401cd | 228.6x355.6x254 |
| ee529090dw /529157/ 529158Xd | 228.6x400.05x296.875 |
| ee700090d/ 700167/ 700168d | 228.6x425.45x361.95 |
| 8576dw /8520 /8520cd | 234.95x327.025x196.85 |
| H247549d /H247510 | 234.95x384.175x457.995 |
| Jm447749dw/ Jm447710/ Jm447710d | 240x338x248 |
| nP461520/ nP464023 / nP467114 | 240x360x308.5 |
| ee127097dw/ 127135 /127136cd | 241.478x349.148x228.6 |
| lm247747dgw /lm247714 | 243.975x329.949x245.999 |
| lm247748dgw/ lm247710 | 244.475x327.025x193.675 |
| ee126096dgw /126150/ 126151cd | 244.475x381x304.8 |
| HH249949d- HH249910 – | 247.65x406.4x446.532 |
| nP872981 /nP240622/ nP560475 | 250.283x339.938x230 |
| Hm252340d/ Hm252315/ Hm252315d | 250.825x431.724x298.453 |
| m249748dgw/ m249710 | 254x358.775x269.875 |
| ee822101d /822175/ 822176d | 254x 444.5x279.4 |
| nP639186/ nP980566 / nP423191 | 260x440x300x4520 |
| ee134102d/ 134143/ 134144cd | 260.350x365.125x228.6 |
| ee221025d /221575/ 221576cd | 260.35x400.050x253.995 |
| ee324103d /324160/ 324161d | 260.350x406.4x317.5 |
| ee435103d /435165/ 435165d | 260.350x419.1x330.2 |
| lm451349dgw/ lm451310 | 266.7x355.6x228.600 |
| ee275106d/ 275160 /275161d | 266.7x406.4x260.355 |
| m252349dw /m252310 /m252310cd | 269.875x381x282.575 |
| 89108d/ 89150/ 89151Xd | 276.225x381x209.55 |
| ee275109dgw /275155/ 275156cd | 276.225x393.7x269.878 |
| m652949dw/ m652911 | 279.4x393.7x270.078 |
| ee135111dgw/ 135155 /135156d | 279.4x393.7x269.875 |
| HH255149d /HH255110/ – | 279.4x457.2x536.778 |
| ee722111d /722185/ 722186cd | 279.4x469.9x349.250 |
| ee941106d /941950 | 279.4x495.3x384.175 |
| nP636921 /nP371486 /nP980520 | 280x420x280 |
| nP419087 /nP501430/ nP279609 | 280.316x389.938x275 |
| lm654648dw /lm654610/ lm654610cd | 285.75x380.898x244.475 |
| m255449dgw /m255410 | 288.925x406.4x298.45 |
| ee330116d /330166 /330167d | 292.1x422.275x269.875 |
| ee921150d/ 921875/ 921876d | 292.1x476.25x292.1 |
| lm255749dgw /lm255710 | 294.975x389.898x220 |
| ee291176d/ 291750/ 291751cd | 298.45x444.5x241.3 |
| ee129119dg/ 129174/ 129175Xd | 299.975x439.948x279.4 |
| nP549475/ nP695911/ nP075542 | 300x460x388.5 |
| Hm256849dw/ Hm256810/ Hm256810cd | 300.038x422.275x311.15 |
| ee329119d /329172/ 329173d | 304.648x438.048x279.4 |
| m757448dgw/ m757410/ m757410d | 304.648x438.048x279.4 |
| m257149dw/ m257110/ m257110d | 304.8x419.1x269.875 |
| ee724121d /724195 /724196cd | 304.8x495.3x349.25 |
| Hm258949d /Hm258910/ Hm258910d | 304.8x501.65x336.547 |
| m257248dgw/ m257210/ m257210d | 304.902x412.648x266.7 |
| nP218100 /nP394908/ nP087208 | 310x400x300 |
| lm258648dgw/lm258610/lm258610d | 317.5x422.275x269.875 |
| Hm259047dgw/Hm259010/Hm259010d | 317.5x447.675x327.025 |
| Hm259049dw/Hm259010/Hm259010cd | 317.5x447.675x327.025 |
| ee141250d/142551/142550Xd | 317.5x647.7x419.1 |
