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Dacromet-Coated Hexagon Socket Countersunk Head Bolts
2026-11-02
| The Dacromet-coated hexagon socket countersunk head bolt e kopanya "flush-fitting countersunk screw head" le zinki-aluminium flake coating e fanang ka lihora tse 720-1,000 tsa ho hanyetsa ho fafatsa letsoai - nako e telele ka makhetlo a 'maloa ho feta liboutu tse tloaelehileng tsa zinki tse entsoeng ka motlakase. Sengoliloeng sena se hlalosa geometry ea bolt, mokhoa oa ho roala oa Dacromet, mochini oa eona o thibelang ho bola, le hore na o bapisoa joang le liphekolo tse ling tse thibelang mafome bakeng sa likurufu le liboutu. |
1. Selelekela: Ke Hobane'ng ha Tšireletso ea Corrosion e le Bohlokoa bakeng sa Bolts le Screw
Li-fasteners - liboutu, li-screw, linate, le li-washer - ke likarolo tse kotsing ea ho bola lenonyeletsong lefe kapa lefe. Boutu e mafome e lahleheloa ke ho kenngoa pele, e ts'oara lesoba la eona le khoele, 'me qetellong e sekisetsa sebopeho sa kopano eohle. Libakeng tsa maoatle, marokho a litsela tse kholo, meaho e kenyang matla a letsatsi, le metjhini e kantle, likurufu tse tloaelehileng tse tlatsitsoeng ka zinki li ka bonts'a mafome a masoeu ka mor'a libeke le mafome a mafubelu ka mor'a likhoeli.
2. Geometry ea Sehlahisoa: The Hexagon Socket Countersunk Head Bolt
| Boholo ba Khoele | Head Diameter (dk) | Bophahamo ba Hlooho (k) | Hex Socket (s) | Tensile Matla Sehlopha | Bolelele bo Tloaelehileng |
| M5 × 0.8 | 10.0 limilimithara | 2.8 limilimithara | 4 limilimithara | 8.8 / 10.9 | 10-60 limilimithara |
| M6 × 1.0 | 11.4 limilimithara | 3.3 limilimithara | 5 limilimithara | 8.8 / 10.9 | 12–80 limilimithara |
| M8 × 1,25 | 15.0 limilimithara | 4.4 limilimithara | 6 limilimithara | 8.8 / 10.9 | 16-100 limilimithara |
| M10 × 1.5 | 18.5 limilimithara | 5.4 limilimithara | 8 limilimithara | 8.8 / 10.9 | 20-120 limilimithara |
| M12 × 1,75 | 21.5 limilimithara | 6.5 limilimithara | 10 limilimithara | 8.8 / 10.9 | 25-150 limilimithara |
Melemo ea bohlokoa ea geometry ea mofuta ona oa screw:
- Bokaholimo ba metsi- hlooho ea countersunk ha e hlahelle, e felisa lintlha tsa snag le ho lumella likarolo tsa ho kopanya hore li lule fatše holim'a metsi.
- Matla a phahameng a torque- sokete ea hexagon e kopanya lifahleho tse tšeletseng, e fetisa torque e fetang 30-50% ho feta koloi e slotted kapa ea Phillips pele e hlobola.
- Tšebelisano ea khoele- likhoele tsa mochini o felletseng (kapa likhoele tse itšebetsang bakeng sa lits'ebetso tsa tšepe) li fana ka li-axial clamping tse matla tsa lenonyello le bolted.
3. Thepa ea Dacromet: Kamoo e Sebetsang Kateng
Dacromet ke lebitso la khoebo le fetohileng nako ea indasteri e akaretsang bakeng sa litlolo tsa zinc-aluminium flake e sebelisoa ka dip-spin kapa spray mme e phekotsoe ka mocheso o ka bang 300 ° C. Ho fapana le electroplating, ts'ebetso ena ha e na electrolytic, kahoo ho roala ha ho hlahisa hydrogen embrittlement - ntlha ea bohlokoa ea tšireletso bakeng sa liboutu tse matla tsa grade 10.9 le ho feta.
Ho roala ke matrix a silevera-grey a zinki le li-flakes tsa aluminium (hangata 0.1-0.5 µm botenya, 15-20 µm kakaretso) e kopantsoeng ke setlamo sa inorganic chromium. Mochine oa eona oa anti-corrosion o habeli:
4. Tšebetso ea Anti-Corrosion: Data Spray Data
Teko ea benchmark bakeng sa ho hanyetsa mafome a fasteners ke teko ea ho se nke lehlakore ea letsoai (NSS) ho latela ISO 9227 / ASTM B117. Letlapa la 3 le bapisa li-screw tse koahetsoeng ka Dacromet le mefuta e meng ea kalafo e atileng haholo ea holim'a metsi.
Letlapa la 3 - Papiso ea ho hanyetsa kutu (teko ea NSS, lihora ho isa ho mafome a pele a khubelu)
| Phekolo ea Bokaholimo | Botenya bo Tloaelehileng | Mafome a Masoeu | Rust e khubelu | Kotsi ea Hydrogen Embrittlement | Index ea Litšenyehelo |
| Letlapa le hlakileng la zinki (Zn) | 5–8µm | 24–96 h | 150–300 h | Mahareng | 1.0 |
| Ho roala zinki e mosehla (Zn-Cr) | 5–8µm | 96–200 h | 300-500 h | Mahareng | 1.2 |
| Hot-dip galvanizing (HDG) | 50-100 µm | — | 1,000–2,000 h | Tlase | 1.5 |
| Dacromet (seaparo se le seng) | 5–8µm | 480–720 h | 720–1,000 h | Ha ho letho | 1.8 |
| Dacromet (lijase tse 2-3) | 10–24 µm | 1,000+ h | 1,500–2,500 h | Ha ho letho | 2.2 |
| Dacromet + top-seal | 10–24 µm | 1,200+ h | 2,000–3,000 h | Ha ho letho | 2.5 |
5. Qetello
Dacromet-coated hexagon socket countersunk head bolt e rarolla mathata a mabeli a khale ka ho fetisisa a ho tiisa likhoele - mafome le protrusion - karolong e le 'ngoe. The countersunk geometry e fana ka motsoako o hloekileng, o hloekileng, o se nang snag le hexagon drive e phahameng ea torque, ha seaparo sa zinc-aluminium flake se fana ka tšireletso le tšireletso e thibelang ho bola e tšoarellang lihora tse 1,000 kapa ho feta tekong ea ho fafatsa letsoai, ntle le hydrogen embrittlement. Bakeng sa baenjiniere le bareki ba totobatsang li-screw le liboutu bakeng sa tikoloho ea kantle, ea metsing, kapa ea lipalangoang, sehlopha sena sa fasteners se fana ka e 'ngoe ea litekanyetso tse ntle ka ho fetisisa tsa ho sireletsa kutu le litšenyehelo tse fumanehang theknolojing ea sejoale-joale ea bolting.
