Plum blossom yokhala ndi screw self tapping screw

Kuphatikiza pa kusiyana kwa miyeso yoyambira monga mutu mpaka m'mphepete ndi makulidwe amutu, kusiyana kofunikira kwambiri pamiyezo ndiko kusiyana kwa magawo opangidwa ndi ulusi. Ulusi wa GB, DIN, JIS, ndi zina zotero zonse zimayesedwa mu millimeters (MM) ndipo zonse zimatchedwa ulusi wa metric. Ulusi monga ANSI, ASME, ndi zina zotero, zomwe zimayesedwa mu mainchesi, zimatchedwa American standard threads. Kuphatikiza pa ulusi wa metric ndi ulusi waku America, palinso muyezo wa BSW waku Britain, womwe ulusi wake umayesedwanso mainchesi, omwe amadziwika kuti Wyeth ulusi.

Ulusi wa Metric umayesedwa mu millimeters (MM) ndipo umakhala ndi ngodya ya mano ya madigiri 60. Ulusi wonse waku America ndi waku Britain amayezedwa mu mainchesi. Mbali ya mano a ulusi waku America ndi madigiri 60, pomwe mbali ya mano ya ulusi waku Britain ndi madigiri 55. Chifukwa cha mayunitsi osiyanasiyana oyezera, njira zoyimira ulusi wosiyanasiyana nazonso sizifanana. Mwachitsanzo, M16-2X60 imayimira ulusi wa metric. Tanthauzo lake lenileni ndikuti m'mimba mwake mwadzina la screw ndi 16MM, phula ndi 2MM, ndipo kutalika kwake ndi 60MM. Mwachitsanzo, 1/4-20X3/4 imaimira ulusi waku Britain, ndipo tanthauzo lake lenileni ndikuti m'mimba mwake mwadzina la wononga ndi 1/4 inchi (inchi imodzi = 25.4MM), yokhala ndi mano 20 pa inchi imodzi ndi kutalika kwa 3/4 inchi. Kuonjezera apo, ponena za zomangira za ku America, UNC ndi UNF nthawi zambiri zimawonjezedwa pambuyo poimira zomangira za ku Britain kuti zisiyanitse pakati pa mano aku America ndi mano abwino aku America.

Mubizinesi yathu yogulitsa kunyumba zatsiku ndi tsiku, miyezo yomwe timakumana nayo nthawi zambiri ndi GB (National Standard) ndi DIN (German Standard).
Pankhani ya zinthu zosanunkhiritsa, miyezo yotsatirayi imakumana nayo: GB30; GB5783; GB5782; GB62; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931, etc. Pakali pano, GB30 (akale dziko muyezo) wakhala m'malo ndi GB5783 (dziko latsopano muyezo) mu bukhu muyezo. GB52 (muyezo wakale wadziko) wasinthidwa ndi GB6170 (mtundu watsopano wadziko) m'buku lokhazikika.

Mu 1986, dziko lathu lidapanga mulingo watsopano wamagawo okhazikika, omwe amadziwika kuti mulingo watsopano mubizinesi. Zomwe zimagwiritsidwa ntchito kwambiri ndi GB5780, GB5781, GB5782, GB5783, ndi GB5784. GB5780 ndi hexagonal mutu wandiweyani ndodo theka wononga dzino ndi mulingo wolondola wa C, womwe ungasinthidwe ndi GB5782 (GB5782 ndi hexagonal mutu wandiweyani ndodo yodzaza dzino ndi mulingo wolondola wa A ndi B). GB5781 ndi hexagonal mutu wodzaza dzino wononga ndi mlingo wolondola wa C. GB5783 angagwiritsidwe ntchito m'malo (GB5783 ndi hexagonal mutu zonse dzino wononga ndi milingo yolondola ya A ndi B). GB5784 ndi wononga hexagonal ndi ndodo yopyapyala ndi dzino theka.

Kusiyanitsa pakati pa cholembera chatsopano ndi cholembera chakale ndikuti M8, M10, M12, M14, ndi M22 zotsatizana zimakhala ndi zosiyana m'lifupi mwake m'mbali. Kupatula pazogulitsa zatsopano za M22, m'mphepete mwazolemba zatsopano M8, M10, M12, ndi M14 ndi 1MM yaying'ono kuposa yachikale chakale. Ndi 13mm, 16mm, 18mm, ndi 21mm motsatana. Komabe, pazogulitsa zatsopano za M22, mbali ina ya cholembera chatsopanoyo ndi yayikulu 2MM kuposa zilembo zakale, kotero chidwi chapadera chiyenera kuperekedwa. Kwa makulidwe a mutu, pali kusiyana pang'ono pakati pa miyezo yatsopano ndi yakale, yomwe ingagwiritsidwe ntchito mosiyana pazochitika zomwe zofunikira sizili zovuta kwambiri.

Kusiyana kwa mulingo watsopano ndi muyezo waku Germany kuli pamatchulidwe amtundu wa M10, M12, M14, ndi M22, omwe amasiyana m'mbali mwake. Mutu mpaka m'mphepete muyezo watsopano wa M10, M12, M14 uyenera kukhala wocheperako 1MM kuposa muyezo waku Germany. Chogulitsa chatsopano cha M22 chili ndi m'lifupi m'mphepete mwamutu womwe ndi 2MM wokulirapo kuposa m'lifupi mwake, ndipo zinthu zina zonse zitha kugwiritsidwa ntchito mosinthana.

Pa mtedza wa hexagonal, miyezo yomwe imagwiritsidwa ntchito nthawi zambiri imaphatikizapo GB52, GB6170, GB6172, ndi DIN934. Kusiyana kwakukulu pakati pawo ndikuti GB6170 ndi yokulirapo kuposa GB52, GB6172, ndi DIN934, yomwe imadziwika kuti mtedza wandiweyani. Komanso, pali kusiyana m'mphepete. Mu mndandanda wa mtedza wa M8, m'mphepete mwa DIN934, GB6170, ndi GB6172 ndi 13mm, yomwe ndi 1MM yaying'ono kuposa 14mm m'mphepete mwa GB52. Kwa mtedza wa M10, m'mphepete mwa DIN934 ndi GB52 ndi 17mm, yomwe ndi 1MM yokulirapo kuposa m'mphepete mwa GB6170 ndi GB6172. Kwa mtedza wa M12, m'mphepete mwa DIN934 ndi GB52 ndi 19mm, yomwe ndi 1MM yaikulu kuposa 18mm m'mphepete mwa GB6170 ndi GB6172. Kwa mtedza wa M14, m'mphepete mwa DIN934 ndi GB52 ndi 22mm, yomwe ndi 1MM yokulirapo kuposa malire a GB6170 ndi GB6172, omwe ndi 21mm. Kuphatikiza apo, mtedza wa M22 uli ndi 32MM m'mphepete mwa DIN934 ndi GB52, yomwe ndi 2MM yaying'ono kuposa 34MM m'mphepete mwa GB6170 ndi GB6172. GB6170 ndi GB6172 ali ndi m'mphepete momwemo m'lifupi kupatula makulidwe awo osiyanasiyana. Mafotokozedwe ena onse atha kugwiritsidwa ntchito mosinthana popanda kuganizira makulidwe.