Dacromet-Coated Socket Head Cap Screws

2026-11-03

1. Nhanganyaya

Socket musoro cap screws, yakamisikidzwa mukati ISO 4762 / DIN 912 - ndiwo mabhaudhi esarudzo chero kupi kwakakwira kusungirira mitoro, compact misoro, uye chaiyo torque control inoungana. Nekuti ivo vanowanzo gadzirwa mumakirasi ezvivakwa 8.8, 10.9 uye kunyanya 12.9, mabhaudhi aya anoshanda pamwero wepamusoro pesimba regoho rawo, uye simba rimwe chete iroro rinoita kuti anyanye kushungurudzwa. hydrogen embrittlement, stress corrosion cracking, uye ngura inotangwa pamusoro fillet uye hex socket madziro.

Dacromet coating - iyo isiri-electrolytic zinc-aluminium flake system inotsanangurwa na ISO 10683 uye ASTM F1136 - inonyatso gadzirisa kusakwana uku. Mune 8-12 μm mutete firimu inopa 720 kusvika 1,000 maawa emunyu wekupfapfaidza kuramba kutanga. ngura tsvuku (ASTM B117 NSS), haigadziri njodzi yehydrogen embrittlement panguva yekugadziriswa, uye inochengetedza iyo chaiyo hex socket geometry uye. 6g thread kushivirira kuti socket head cap screws zvinoenderana.

2. Bolt Geometry uye Dhizaini Zvimiro

Socket head cap screw ibhaudhi rakazara-simba rine musoro wecylindrical uye yemukati hexagon socket drive:

Cylindrical headpamwe a knurled circumferential surface; musoro dhayamita dk ≈ 1.5 × d - inenge 30-40% duku kudarika hexagon musoro bhoti yehukuru hwakafanana, inobvumira compact, yakavharwa-yakadzika mabhoti maitiro;
Musoro-kune-shank fillet, iyo kuneta-yakakosha shanduko yenzvimbo uko kushushikana kwakanyanya kwakanyanya;
shinda yakazara kana chidimbu chidimbu(smooth shank) zvitaera; partial-thread screws inoisa ndege yeshear mu shank isina kuverengwa nokuda kwepamusoro-soro yekugera;
Point variants: flat (chamfered) point standard; imbwa pointuye cone point yenzvimbo nekuvhara mabasa.

Kuenzaniswa nehex bolts, SHCS inogadzira yakakwirira preload kune imwe torque yekutenda kune inoshanda socket drive, uye inoiswa nehex kiyi, torque wrenches, kana powered hex driver - achivaita mabhaudhi akajairwa mumaturusi emuchina, jekiseni molds, hydraulic manifolds, jigs uye zvigadziriso, uye marobhoti.

3. Corrosion Performance Kuenzanisa

Kupfekedza pakirasi 8.8-12.9 SHCS	Ukobvu	Kupfapfaidza munyu kune ngura tsvuku (ASTM B117)	Hydrogen embrittlement ngozi	Notes
Black oxide (yakasviba), ine mafuta	<1 μm	<24 h	Hapana	Cosmetic chete; mafuta anosuka
Zinc phosphate + mafuta	3–5 μm	≈ 48–72 h	Hapana	Kazhinji "dema" kupera, hupenyu hushoma
Electro-galvanized Zn12, Cr(VI)-isina	12 μm	≈ 192 h	High (12.9 haina kukurudzirwa)	Socket neshinda dzakatetepa-plated
Zinc-nickel alloy electro-plate	8–12 μm	≈ 480–720 h	Pakati nepakati	Mutengo wepamusoro; inoda post-bake
Dacromet DAC 320 (Kirasi 2)	8 μm	≈ 720 h	Zvinenge hapana	Silver grey
Dacromet DAC 500 / dema	10–12 μm	≈ 1,000 h	Zvinenge hapana	Black finish machisi akasvibira akatevedzana

6. Mitemo uye Chimiro Chigadzirwa Range

Mitemo yakakosha: ISO 4762 / DIN 912 (socket head cap screws), ISO 898-1 (mechanical properties), ISO 10683:2018 (isina-electrolytic zinc flake coatings), ASTM F1136, ASTM B117, ISO 4042 (electroplating uye HE kutungamira), DIN 267-28 uye GB/T 70.1 / GB/T 5267.3.

Parameter	Common Range
Diameter	M3 – M42 (No.4 – 1-1/2”)
Urefu	6 – 300 mm, shinda yakazara kana chidimbu
Property class	8.8 / 10.9 / 12.9
Musoro style	Yakajairwa (ISO 4762), musoro wakaderera (DIN 6912), musoro wakakora
Point	Flat / imbwa point / cone point
Coating	DAC 320 / DAC 400 / DAC 500; sirivha grey kana dema; Cr(VI)-yemahara
Thread tolerance	6g, shinda dzakaputirwa pasina kudzvanya zvakare

7. Zvikumbiro uye Kusarudza Nhungamiro

1.Match coating kune simba: yekirasi 10.9 uye 12.9 mabhaudhi, anoomerera pane isiri-electrolytic zinc flake (Dacromet / Geomet) kubvisa hydrogen embrittlement;

2.Replace black oxide zvine hungwaru: tsanangura dema Dacromet apo vatengi vanoda iyo yakasvibira kutaridzika nekudzivirira chaiko ngura;

3.Verify coating classnemaawa eNSS (DAC 320 ≈ 720 h; DAC 500 ≈ 1,000 h) uye kukumbira mushumo wekuedza wemugadziri wekuputira;

4.Simbisa Cr(VI)-yemahara passivation(trivalent chromium) yekutevedzera RoHS / ELV;

5.Check friction data: tora iyo nut factor uye coefficient-of-friction report ye torque-inodzorwa musangano;

6.Pedzisa hurongwa: shandisa nzungu dzakavharwa, mawachi, uye akatepwa ekuisa zvino enderana kudzivirira kusanganiswa-kunogona kusungirira seti.

8. Mhedziso

Dacromet-yakavharwa socket head cap screws inobatanidza hunhu hweakasimba-chinangwa-mabhaudhi - compact cylindrical misoro, inoshanda hex socket drive, yakakwira preload kugona - ine coating system yakagadzirirwa chaizvo izvo zvisina simba zvibodzwa: hapana hydrogen embrittlement pa12.9 simbi, kufukidzira mune socket-hekupikisisa uye nzvimbo dzakatsvuka uye nzvimbo dzakatsvuka. kugadzikana kwegungano chairo. Yakatsanangurwa nemazvo, vanoendesa 720-1,000 maawa ekupfapfaidza munyu mune 8-12 μm firimu, uye vanounza yakasviba, matte kutaridzika kwemabhaudhi akasvibira kuita basa rechokwadi rekudzivirira.

Hauna. Next.