I-Dacromet-Coated Socket Head Cap Screws

2026-11-03

1. Intshayelelo

Izikrufu zentloko yesokethi, ezikumgangatho ophakathi ISO 4762 / DIN 912 -Ziibholiti ezikhethiweyo naphi na apho imithwalo ephezulu yokubambelela, iintloko ezixineneyo, kunye nolawulo lwetorque oluchanekileyo ludibana. Kuba ziqhele ukwenziwa kwiiklasi zepropathi 8.8, 10.9 kwaye ngakumbi 12.9, ezi bholithi zisebenza kwipesenti ephezulu yamandla esivuno sazo, kwaye kwaloo mandla manye abenza babe sesichengeni ngokukhethekileyo. i-hydrogen embrittlement, ukuqhekeka kwe-corrosion yoxinzelelo, kunye nomhlwa oqalwe kwi-fillet yentloko kunye neendonga zesokethi ye-hex.

I-Dacromet-Coated Socket Head Cap Screws

I-Dacromet coating - i-non-electrolytic i-zinc-aluminium flake inkqubo echazwe yi ISO 10683 kwaye I-ASTM F1136 - ilungisa ngokuchanekileyo obu buthathaka. Kwifilimu ecekethekileyo ye-8-12 μm ihambisa iiyure ezingama-720 ukuya kwi-1,000 zokuxhathisa isitshizi setyuwa kuqala. umhlwa obomvu (I-ASTM B117 NSS), ayenzi mngcipheko wokuhombisa i-hydrogen ngexesha lokusetyenzwa, kwaye igcina i-hex socket geometry echanekileyo kunye 6g ukunyamezela intambo ukuba izikrufu zentloko socket zixhomekeke.

2. I-Bolt Geometry kunye neMiba yoYilo

Isikrufu sentloko yesokethi yibhowuthi egcweleyo-yomelele enentloko eyicylindrical kunye ne-hexagon socket drive yangaphakathi:

Intloko yeCylindricalkunye no gquba umgangatho ojikelezayo; intloko ububanzi dk ≈ 1.5 × d - malunga ne-30-40% encinci kune-hexagon head bolt yobukhulu obufanayo, ivumela i-compact, i-close-pitched bolt pattern;
I-Fillet yentloko ukuya kwi-shank, indawo yenguqu ekhathalayo-ebaluleke kakhulu apho uxinzelelo lwexinzelelo luphezulu;
Umsonto opheleleyo okanye umsonto ongaphelelanga(i-shank egudileyo) izimbo; izikrufu zemisonto ezingaphelelanga zibeka inqwelomoya yokucheba kwi-shank engafundwanga ukwenzela umthamo ophezulu wokucheba;
Point ezahlukeneyo: umgangatho wenqaku (flat (chamfered)); inja pointkwaye indawo yekhowuni indawo kunye nokutshixa imisebenzi.

Xa kuthelekiswa neebholiti ze-hex, iSHCS ivelisa phezulu ukulayisha kwangaphambili kwi-torque efanayo ngokubonga kwi-socket drive esebenzayo, kwaye zifakwe kunye nezitshixo ze-hex, i-wrenches ye-torque, okanye abaqhubi be-hex ene-powered - babenze iibholiti eziqhelekileyo kwizixhobo zoomatshini, ii-injection molds, i-hydraulic manifolds, i-jigs kunye ne-fixtures, kunye neerobhothi.

3. Uthelekiso lokuSebenza koMhlwa

Ukwambathisa kwiklasi 8.8-12.9 SHCS	Ukutyeba	Isitshizi setyuwa ukuya kumhlwa obomvu (ASTM B117)	Umngcipheko we-hydrogen embrittlement	Amanqaku
I-oxide emnyama (imnyama), i-oyile	< 1 μm	< 24 h	Akukho nanye	Izithambiso kuphela; ioli iyahlamba
I-zinc phosphate + ioli	3–5 μm	≈ 48–72 h	Akukho nanye	Ukugqiba "omnyama" okuqhelekileyo, ubomi obulinganiselwe
Electro-galvanized Zn12, Cr(VI)-free	12 μm	≈ 192 h	Phezulu (12.9 ayikhuthazwa)	Isokethi kunye nemisonto ecekethekileyo
I-zinc-nickel alloy electro-plate	8–12 μm	≈ 480-720 h	Phakathi	Iindleko eziphezulu; ifuna ukubhaka emva
I-Dacromet DAC 320 (Iklasi yesi-2)	8mm	≈ 720 h	Ngokwenyani akukho nanye	Silver grey
Dacromet DAC 500 / emnyama	10–12 μm	≈ 1,000 h	Ngokwenyani akukho nanye	Ukugqibezela okumnyama kuhambelana nothotho olumnyama

6. Imigangatho kunye noluhlu lweeMveliso eziqhelekileyo

Imigangatho engundoqo: ISO 4762 / DIN 912 (izikrufu zentloko yesokethi), ISO 898-1 (iipropati zomatshini), ISO 10683:2018 (i-non-electrolytic zinc flake coatings), I-ASTM F1136, I-ASTM B117, ISO 4042 (i-electroplating kunye ne-HE guide), I-DIN 267-28 kwaye GB/T 70.1 / GB/T 5267.3.

Ipharamitha	Uluhlu oluqhelekileyo
Ububanzi	M3 – M42 (No.4 – 1-1/2”)
Ubude	6 - 300 mm, intambo epheleleyo okanye intambo engaphelelanga
Iklasi yePropati	8.8 / 10.9 / 12.9
Isimbo sentloko	Umgangatho (ISO 4762), intloko ephantsi (DIN 6912), intloko eknurled
Inqaku	Isicaba / indawo yenja / indawo yekhowuni
Ukwaleka	DAC 320 / DAC 400 / DAC 500; isilivere engwevu okanye emnyama; Cr(VI)-simahla
Ukunyamezela imisonto	6g, imisonto egqunywe ngaphandle kokuphinda ucofe

7. Izicelo kunye nesiKhokelo sokuKhetha

1.Match ukutyabeka ukuze amandla: kwiklasi ye-10.9 kunye ne-12.9 bolts, igxininise kwi-non-electrolytic zinc flake (iDacromet / Geomet) ukuphelisa i-hydrogen embrittlement;

2.Replace black oxide ngobukrelekrele: cacisa i-dacromet emnyama xa abathengi befuna inkangeleko emnyama kunye nokhuseleko lokwenyani lomhlwa;

3. Qinisekisa iklasi yokwalekangeeyure ze-NSS (DAC 320 ≈ 720 h; DAC 500 ≈ 1,000 h) kwaye ucele ingxelo yovavanyo lomenzi wokugquma;

4.Qinisekisa i-Cr(VI)-free passivation(i-trivalent chromium) yokuthotyelwa kwe-RoHS / ELV;

5.Jonga idatha yokukhuhlana: fumana i-nut factor kunye nengxelo ye-coefficient-of-friction yendibano elawulwa yi-torque;

6.Gcwalisa inkqubo: sebenzisa amantongomane agqunyiweyo, iiwasha, kunye nofakelo olucofiweyo olunokubakho oluhambelanayo ukunqanda iiseti zokuqhobosha ezinokuthi zibe kho.

8. Isiphelo

I-Dacromet-coated socket head cap screws idibanisa amandla omatshini eebholiti ezinamandla kakhulu-injongo ebanzi-intloko ye-cylindrical esebenzayo, i-hex socket drive esebenzayo, ikhono lokulayisha okuphezulu - kunye nenkqubo yokwaleka eyenzelwe ngqo iindawo zabo ezibuthathaka: akukho embrittlement ye-hydrogen kwi-12.9 yentsimbi, ukugubungela kwisokhethi kunye ne-self-pitting kunye neendawo ezibomvu zokuqhawula uzinzo kwindibano echanekileyo. Icaciswe ngokuchanekileyo, ihambisa iiyure ezingama-720-1,000 zokutshiza ngetyuwa kwifilimu eyi-8-12 μm, kwaye izise ubumnyama, inkangeleko emdaka yeebholiti ezimnyama kwinkonzo yokuqinisekisa ukubola.

Andinayo. Okulandelayo.

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