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Kereiti ea 8.8 ea Hex Bolts
2026-08-03
1. Sehlopha sa 8.8 - Sehlopha sa Fastener ea Matla a Medium-High
1.1 Ho hlakisa 8.8 Tlhaloso
Letšoao "8.8" ke lebitso la sehlopha sa thepa se hlalosoang ke ISO 898-1, maemo a machaba a laolang thepa ea mochini oa tšepe ea carbon le litšepe tsa alloy steel. Sistimi ea linomoro tse peli e kenyelletsa likarolo tse peli tsa bohlokoa tsa mochini:
● Nomoro ea pele (8): E bonts'a karolo e le 'ngoe ho tse leshome ea matla a fokolang ka lebitso la megapascals → 8 × 100 = 800 MPa bonyane ba matla a ho tiea.
● Nomoro ea bobeli (.8): E emela karolelano ea lihlahisoa → 0.8 × 800 = 640 MPa bonyane matla a tlhahiso.
Li-fasteners tsa Kereiti ea 8.8 ke li-fasteners tse sebelisoang haholo lefatšeng ka bophara, tse koahelang liboutu tsa hex, li-screws tsa hex cap, liboutu tsa kariki, liboutu, le likurufu tse khoele ka botlalo bakeng sa kaho ea litšepe, likopano tsa likoloi le metjhini e akaretsang.
Setšoantšo sa 1. Liboutu tsa hekse tsa Kereiti ea 8.8 tse nang le matšoao a sehlopha sa thepa
1.2 Thepa ea Mechini
Li-fasteners tsa Kereiti ea 8.8 li entsoe ka tšepe ea khabone e mahareng 'me li etsoa ho tima le ho futhumatsa (Q&T) ho fihlela ts'ebetso e hlokahalang ea mochini. Thepa ea bohlokoa ho latela ISO 898-1:
| Thepa | Boleng | Yuniti |
| Matla a Tlase a Tensile (Rm) | 800 | MPa |
| Nako e Nyenyane ea Kotulo (ReL) | 640 | MPa |
| Elongation e fokolang ka mor'a ho robeha | ≥ 12 | % |
| Core Hardness (HV) | 250–310 | HV |
| Mathata a Tloaelehileng a Q&T (HRC) | 22–32 | HRC |
| Nominal Bolt Diameter Range | M5 – M39 | mm |
Letlapa la 1. Lintho tse ka sehloohong tsa mechine ea li-fasteners tsa Kereiti ea 8.8 ka ISO 898-1
1.3 Lisebelisoa tse khothalelitsoeng
Ho khetha thepa e tala e nepahetseng ke motheo oa ho hlahisa li-fasteners tse tšepahalang tsa Kereiti ea 8.8. Litšepe tse latelang, tse kopantsoeng le Q&T e nepahetseng, li fihlella ts'ebetso e tsitsitseng ea Kereiti ea 8.8:
● 35 # Medium-Carbon Steel - E loketse li-fasteners tse nyenyane tse bophara ba bophara (≤ M16). E boloka litšenyehelo, boima bo lekaneng ka mor'a Q&T.
● 45# Medium-Carbon Steel — Khetho e tsebahalang haholo bakeng sa liboutu tsa lihekse tsa Kereiti ea 8.8 le liboutu tsa stud. Ho sebetsa hantle, thepa e tsitsitseng ea mochini kamora Q&T.
● 40Cr Alloy Steel - E khethoa bakeng sa liboutu tse kholoanyane tsa bophara (M20+). Keketso ea Chromium e ntlafatsa ho thatafala le ho ts'oana ho ts'oana ho pholletsa le likarolo tse fapaneng.
1.4 Papiso ea Kereiti
| Kereiti | Tensile (MPa) | Hlahisa (MPa) | Lisebelisoa tse khothalelitsoeng |
| 4.6 | 400 | 240 | Tšepe ea carbon e tlaase, e sa chesoeng ka mocheso |
| 4.8 | 420 | 340 | Tšepe e tlaase ea carbon, e sebetsang ka serame |
| 8.8 | 800 | 640 | 35 # / 45 # Tšepe ea Carbon, 40Cr Alloy Steel; Q&T |
| 10.9 | 1,040 | 940 | 40Cr, 35CrMo, 42CrMo, SCM435; Q&T |
| 12.9 | 1,220 | 1,100 | 42CrMo4 / SCM440, 35CrMoV; Q&T 39–44 HRC |
Letlapa la 2. Litlelase tse tloaelehileng tsa thepa ea fastener le lisebelisoa tse khothalletsoang
2. Hex Bolts - The Fasteners Fetolana ka ho Fetisisa
2.1 Hex Bolt ke Eng?
Hex bolt (hexagonal head bolt) ke sekoahelo se khoele se nang le hlooho e mahlakoreng a tšeletseng, se etselitsoeng ho kenngoa ka masoba likarolong tse kopantsoeng le ho tiisoa ke nate ea ho nyalana. Jiometry ea hexagonal e lumella ho kenella ha wrench kapa socket ho tloha mahlakoreng a mangata, ho e etsa mofuta oa bolt o sebetsang ka ho fetesisa le o sebelisoang haholo liindastering tsohle. Ho na le mefuta e 'meli e meholo:
● Hex Bolt (ISO 4014 / DIN 931) - E hlophisitsoe ka mokhoa o itseng: karolo e sa baleheng ea shank e fana ka matla a ho kuta le ho tsamaisana, e loketseng bakeng sa likhokahano tsa meralo.
● Hex Cap Screw (ISO 4017 / DIN 933) — E hlophisitsoe ka botlalo: likhoele li matha bolelele bohle, tse loketseng lits'ebetso tse hlokang ho kenella ha khoele ka bongata.
2.2 Mefuta e Tloaelehileng ea Hex Bolt & Mefuta e sa tšoaneng
● Hex Head Bolt / Cap Screw - Hlooho e tloaelehileng ea mahlakore a tšeletseng; e fapaneng haholo, e sebelisoang kahong, metjhini, likoloi.
● Hex Flange Bolt - Flange e kopantsoeng ea washer-joaloka flange tlas'a hlooho; e aba li-clamp load, e felisa washer e arohaneng.
● Heavy Hex Bolt (ASTM A325) - Hlooho e khōloanyane bakeng sa likhokahano tsa tšepe ea mohaho; e boletsoeng ka litekanyetso tsa Amerika Leboea.
● Hex Lag Bolt / Carriage Bolt - Mefuta e khethehileng bakeng sa likhokahano tsa lehong ho ea ho tšepe le mapolanka.
2.3 Boholo le boholo bo tloaelehileng
| Boholo | Pitch | Wrench | Hlooho dia. | Hlooho ht. | Shank dia. | Length Range |
| M6 | 1.0 | 10 limilimithara | 10.0 | 4.0 | 6.0 | 16–60 |
| M8 | 1.25 | 13 limilimithara | 13.0 | 5.3 | 8.0 | 20–80 |
| M10 | 1.5 | 16 limilimithara | 16.0 | 6.4 | 10.0 | 25–100 |
| M12 | 1.75 | 18 limilimithara | 18.0 | 7.5 | 12.0 | 30–120 |
| M16 | 2.0 | 24 limilimithara | 24.0 | 10.0 | 16.0 | 40–150 |
| M20 | 2.5 | 30 limilimithara | 30.0 | 12.5 | 20.0 | 50–200 |
| M24 | 3.0 | 36 limilimithara | 36.0 | 15.0 | 24.0 | 60–240 |
Lethathamo la 3. Kereiti ea 8.8 litekanyo tsa hex bolt ho latela ISO 4014 / ISO 4017
3. Kereiti ya 8.8 Hex Bolts — Kgetho & Tshebediso
3.1 Kalafo ea Bokaholimo
Khetho ea kalafo ea holim'a metsi e ipapisitse le tikoloho ea ts'ebetso le litlhoko tsa ts'ireletso ea kutu. Likhetho tse tloaelehileng tsa Grade 8.8 hex bolts li kenyelletsa:
● Zinc Plating (Electroplated) - Moruo, ho hanyetsa kutu e itekanetseng; khetho e tloaelehileng bakeng sa tikoloho ea kahare le e bonolo.
● Hot-Dip Galvanizing - Ho roala zinki tse teteaneng bakeng sa ho pepeseha ka ntle le leoatleng; e hloka linate tse tapped tse fetang boholo.
● Dacromet Coating - Ts'ebetso e se nang Chromium, e se nang tikoloho; khanyetso e phahameng ea letsoai-spray ntle le kotsi ea hydrogen embrittlement. E loketse bakeng sa lisebelisoa tsa likoloi le tsa meralo.
● Ruspert Coating - Motsoako oa lihlopha tse tharo tsa organic / zinc; boemo ba leholimo bo botle haholo, bo atisang ho hlalosoa ka litekanyetso tsa indasteri tsa Majapane.
3.2 Tataiso ea ho kenya
● Sebelisa linate tse tsamaellanang tsa Kereiti ea 8 bakeng sa ho tsamaellana le matla a khoele.
● Sebelisa torque e tiisitsoeng e boletsoeng ho leqephe la data la moetsi; ho tiisa hofeta dikotsi ho hloleha ha bolt.
● Lubricate likhoele pele torque tshebediso — khohlano coefficient ama haholo finyelloang pele mojaro.
● Netefatsa hore bonyane khoele e le 'ngoe e tletseng e hlahella ka nģ'ane ho sefahleho sa linate ka mor'a ho tiisa.
● Qoba ho sebelisa hape liboutu tsa Kereiti ea 8.8 likhokahanong tsa meralo ea bohlokoa kamora ho kenya torque e felletseng.
3.3 Maemo le Setifikeiti
Li-bolt tsa Grade 8.8 tsa hex li etsoa le ho lekoa ho latela:
● ISO 898-1 - Lisebelisoa tsa mechine ea li-fasteners tse entsoeng ka tšepe ea carbon le alloy steel.
● ISO 4014 - Liboutu tsa Hex tse nang le shank e sa fellang (litekanyo).
● ISO 4017 - Li-screws tsa hex cap tse nang le khoele e feletseng (litekanyo).
● Setifikeiti sa tlhahlobo ea thepa e felletseng (MTC) ho ea ka EN 10204 3.1 se fumaneha ha u se kopa.
Reference Quick
| Kereiti | Lisebelisoa tse khothalelitsoeng | Mefuta e Tloaelehileng ea Lihlahisoa | Kalafo ea Mocheso |
| 8.8 | 35# / 45# Carbon Steel 40Cr Alloy Steel | Hex Bolt, Hex Cap Screw, Carriage Bolt, Stud Bolt | Ho khutsisa & ho halefisa |
Lethathamo la 4. Referense e potlakileng - Khetho ea li-fasteners tsa Kereiti ea 8.8
