Dacromet-Coated Hexagon Socket Countersunk Head Bolts

2026-11-02

Iyo Dacromet-yakavharwa hexagon socket countersunk head bolt inosanganisa flush-fitting countersunk screw head ine zinc-aluminum flake coating iyo inopa 720-1,000 maawa ekupikisa munyu-spray - nguva yakati wandei kupfuura yakajairwa electro-plated zinc mabhaudhi. Ichi chinyorwa chinotsanangura iyo bhaudhi geometry, iyo Dacromet yekupfekedza maitiro, yayo anti-corrosion mashandiro, uye kuti inofananidzwa sei nedzimwe ngura-proofing marapirwo emakona nemabhaudhi.

1. Nhanganyaya: Sei Corrosion Kudzivirirwa Kunokosha kune Bolts uye Screws

Mafasteners - mabhaudhi, screws, nzungu, uye washers - ndizvo zvakanyanya corrosion-zvinokanganisa zvikamu mune chero mabhaudhi majoini. Bhaudhi rine ngura rinorasa kurongedzerwa, rinobata mugomba raro rine shinda, uye rinopedzisira rakanganisa kunaka kwechimiro chegungano rose. Munzvimbo dzemugungwa, mabhiriji emigwagwa mikuru, zvimisikidzo zvezuva, uye michina yekunze, akajairwa zinc-plated screws anogona kuratidza ngura chena mukati memavhiki uye tsvuku ngura mukati memwedzi.

2. Chigadzirwa Geometry: The Hexagon Socket Countersunk Head Bolt

Thread Size	Musoro Diameter (dk)	Kureba Musoro (k)	Hex Socket (s)	Tensile Simba Kirasi	Kureba Kwakafanana
M5 × 0.8	10.0 mm	2.8 mm	4 mm	8.8 / 10.9	10–60 mm
M6 × 1.0	11.4 mm	3.3 mm	5 mm	8.8 / 10.9	12–80 mm
M8 × 1.25	15.0 mm	4.4 mm	6 mm	8.8 / 10.9	16–100 mm
M10 × 1.5	18.5 mm	5.4 mm	8 mm	8.8 / 10.9	20–120 mm
M12 × 1.75	21.5 mm	6.5 mm	10 mm	8.8 / 10.9	25–150 mm

Yakakosha geometry mabhenefiti eiyi screw type:

Dacromet-Coated Hexagon Socket Countersunk Head Bolts

Flush pamusoro- iyo countersunk musoro haibudiriri, ichibvisa snag points uye kubvumira zvikamu zvekusangana kuti zvigare zvakadzika pamusoro.
High torque capacity- iyo hexagon socket inobata zviso zvitanhatu zvekusangana, ichiendesa 30-50% yakawanda torque pane yakatsvetwa kana Phillips drive isati yakurura.
Thread engagement--yakazara-fomu yemuchina tambo (kana wega-tapping tambo dzesheet-simbi maapplication) inopa yakasimba axial clamping yejoint yakasungwa.

3. Iyo Dacromet Coating: Iyo Inoshanda Sei

Dacromet izita rekutengesa rave iro generic indasitiri nguva ye zinc-aluminium flake coatings inoshandiswa ne dip-spin kana kupfapfaidza uye inoporeswa panosvika 300 °C. Kusiyana neelectroplating, iyo nzira haisi-electrolytic, saka iyo yekuputira inosuma isina hydrogen embrittlement - yakakosha kuchengetedza chinhu chepamusoro-simba mabhaudhi egiredhi 10.9 uye pamusoro.

Iyo yekupfekedza isirivha-grey matrix ye zinc inopindirana uye aluminium flakes (kazhinji 0.1-0.5 µm gobvu, 15–20 µm yakazara) inosungirirwa neinorganic chromium compound binder. Iyo anti-corrosion mechanism ine katatu:

4. Anti-Corrosion Performance: Salt Spray Data

Muyedzo webenchmark wefastener rust kuramba ndeye kwayakarerekera munyu spray (NSS) bvunzo pane ISO 9227 / ASTM B117. Tafura 3 inoenzanisa neDacromet-yakavharwa screws neakajairika mamwe maitiro ekurapa epamusoro.

Tafura 3 - Corrosion kuramba kuenzanisa (NSS bvunzo, maawa kusvika kune yekutanga tsvuku ngura)

Surface Treatment	Typical Ukobvu	White Ngura	Red Ngura	Hydrogen Embrittlement Ngozi	Indekisi yemitengo
Yakajeka zinc plating (Zn)	5–8 µm	24–96 h	150–300 h	Pakati	1.0
Yero zinc plating (Zn-Cr)	5–8 µm	96–200 h	300–500 h	Pakati	1.2
Kupisa-dip galvanizing (HDG)	50–100 µm	—	1,000–2,000 h	Low	1.5
Dacromet (1 jasi)	5–8 µm	480–720 h	720–1,000 h	Hapana	1.8
Dacromet (2-3 majasi)	10–24 µm	1,000+ h	1,500–2,500 h	Hapana	2.2
Dacromet + pamusoro-chisimbiso	10–24 µm	1,200+ h	2,000–3,000 h	Hapana	2.5

5. Mhedziso

Iyo Dacromet-yakavharwa hexagon socket countersunk head bolt inogadzirisa matambudziko maviri ekare mukusungirirwa kweshinda - ngura uye protrusion - mune chimwe chikamu. Iyo countersunk geometry inopa inoyerera, yakachena, isina snag-isina snag-yepamusoro-torque hexagon drive, nepo zinc-aruminiyamu flake coating inopa chibairo uye chinovharira chidziviriro chinopesana necorrosion chinogara maawa chiuru kana kupfuura mukuyedzwa kwemunyu-spray, pasina hydrogen embrittlement. Kune mainjiniya nevatengi vanotsanangudza screws nemabhaudhi ekunze, emugungwa, kana ezvekufambisa nharaunda, iyi fastener kirasi inopa imwe yeakanakisa corrosion-yekudzivirira-kune-mutengo ratios inowanikwa mune yemazuvano bolting tekinoroji.

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