Dacromet-Coated Socket Head Cap Screws

2026-11-03 IB

1. Taw qhia

Qhov (socket) taub hau hau screws, standardized nyob rau hauv ISO 4762 / DIN 912 Cov ntawv pov thawj - yog cov bolts ntawm kev xaiv nyob qhov twg siab clamping loads, compact hau, thiab meej torque tswj los ua ke. Vim tias lawv feem ntau tsim nyob rau hauv cov khoom vaj khoom tsev 8.8, 10.9 thiab tshwj xeeb tshaj yog 12.9, cov bolts no ua haujlwm ntawm qhov feem pua ntawm lawv lub zog tawm los, thiab tib lub zog ua rau lawv muaj kev cuam tshuam tshwj xeeb rau hydrogen embrittlement, kev nyuaj siab corrosion cracking, thiab xeb pib ntawm lub taub hau fillet thiab hex socket phab ntsa.

Dacromet txheej - tsis-electrolytic zinc-aluminium flake system txhais los ntawm ISO 10683 Kev Tswj Xyuas Kev Lag Luam thiab ASTM F 1136 Cov Lus Qhia - hais meej meej cov kev tsis muaj zog no. Hauv 8-12 μm nyias zaj duab xis nws xa 720 mus rau 1,000 xuab moos ntawm ntsev tsuag ua ntej liab xeb (ASTM B117 NSS), tsim tsis muaj hydrogen embrittlement txaus ntshai thaum ua, thiab khaws cia qhov tseeb hex socket geometry thiab 6g xov tolerance uas lub qhov (socket) lub taub hau hau screws nyob ntawm.

2. Bolt Geometry thiab tsim nta

Lub qhov (socket) lub taub hau taub hau ntsia hlau yog lub zog tag nrho nrog lub taub hau cylindrical thiab lub qhov (socket) sab hauv hexagon tsav:

Lub taub hau cylindricalnrog a ua knurl circumferential nto; lub taub hau txoj kab uas hla dk ≈ 1.5 × d - kwv yees li 30-40% me dua lub taub hau hexagon ntsia liaj qhov rooj ntawm tib qhov loj, tso cai rau compact, kaw-pitched bolt qauv;
Head-rau-shank fillet, qhov qaug zog-tseem ceeb hloov chaw uas muaj kev ntxhov siab ntau tshaj;
Tag nrho xov los yog ib nrab xov(nqaim shank) styles; ib nrab-xov xov screws tso lub dav hlau shear nyob rau hauv lub unthreaded shank rau siab shear muaj peev xwm;
Point variants: flat (chamfered) point standard; dog pointthiab cone point rau qhov chaw thiab xauv lub luag haujlwm.

Piv nrog rau hex bolts, SHCS tsim ntau dua preload rau tib lub zog ua tsaug rau lub qhov (socket) tsav tau zoo, thiab lawv tau nruab nrog cov yuam sij hex, torque wrenches, lossis lub zog hex tsav - ua rau lawv tus qauv bolts hauv cov cuab yeej siv tshuab, txhaj tshuaj pwm, hydraulic manifolds, jigs thiab fixtures, thiab robotics.

3. Corrosion Performance Comparison

Txheej ntawm chav kawm 8.8–12.9 SHCS	Thickness	Tshuaj tsuag ntsev rau liab xeb (ASTM B117)	Hydrogen embrittlement txaus ntshai	Sau ntawv
Dub oxide (blackened), oiled	<1 μm	<24 h	Tsis muaj	Tshuaj pleev ib ce; roj ntxuav tawm
Zinc phosphate + roj	3-5 m	≈ 48–72 h	Tsis muaj	Common "dub" tiav, txwv lub neej
Electro-galvanized Zn12, Cr(VI)-dawb	12m ua	≈ 192 h	Siab (12.9 tsis pom zoo)	Qhov (socket) thiab threads nyias-plated
Zinc-nickel alloy electro-phaj	8-12 m	≈ 480–720 h	Nruab nrab	Tus nqi siab dua; xav tau tom qab ci
Dacromet DAC 320 (Class 2)	8m ua	≈ 720 h	Zoo tsis muaj	Nyiaj grey
Dacromet DAC 500 / dub	10-12 m	≈ 1,000 h	Zoo tsis muaj	Dub tiav match nrog blackened series

6. Cov qauv thiab cov khoom sib txawv

Cov qauv tseem ceeb: ISO 4762 / DIN 912 Cov ntawv pov thawj (socket head cap screws), TS EN ISO 898-1 (mechanical zog), ISO 10683: 2018 (non-electrolytic zinc flake coatings), ASTM F 1136 Cov Lus Qhia, ASTM B 117, TS EN ISO 4042 (electroplating thiab HE kev taw qhia), PIB 267-28 thiab GB/T 70.1/GB/T 5267.3.

Parameter	Feem ntau
Txoj kab uas hla	M3 - M42 (No.4 - 1-1/2")
Ntev	6 - 300 mm, tag nrho xov los yog ib nrab xov
Chav kawm vaj tse	8.8 / 10.9 / 12.9
Lub taub hau style	Txheem (ISO 4762), lub taub hau qis (DIN 6912), knurled taub hau
Taw tes	Pav / dev point / cone point
Txheej	DAC 320 / DAC 400 / DAC 500; nyiaj grey los yog dub; Cr(VI)-dawb
Xov kam rau ua	6g, threads coated tsis rov tapping

7. Daim ntawv thov thiab kev taw qhia kev xaiv

1.Match txheej rau lub zog: rau chav kawm 10.9 thiab 12.9 bolts, hais rau cov uas tsis yog-electrolytic zinc flake (Dacromet / Geomet) kom tshem tawm hydrogen embrittlement;

2. Hloov cov oxide dub kom ntse: Qhia meej dub Dacromet thaum cov neeg siv khoom xav kom pom cov xim dub nrog kev tiv thaiv xeb tiag tiag;

3. Txheeb xyuas cov chav kawm txheej txheejlos ntawm NSS teev (DAC 320 ≈ 720 h; DAC 500 ≈ 1,000 h) thiab thov cov txheej txheem tsim cov ntawv xeem;

4.Txhim kho Cr(VI)-dawb passivation(trivalent chromium) rau RoHS / ELV ua raws;

5.Saib cov ntaub ntawv sib txhuam: tau txais cov txiaj ntsig ntawm cov txiv ntoo thiab cov ntawv qhia coefficient-of-kev sib txhuam rau torque-tswj los ua ke;

6. Ua kom tiav qhov system: siv cov txiv ntseej coated, ntxhua khaub ncaws, thiab tapping inserts ntawm lub peev xwm sib xws kom tsis txhob muaj cov khoom sib xyaw ua ke.

8. Cov lus xaus

Dacromet-coated socket head cap screws sib sau ua ke cov neeg kho tshuab kev tsim txiaj ntawm qhov muaj zog tshaj plaws-lub hom phiaj bolts - compact cylindrical hau, zoo hex socket tsav, siab preload muaj peev xwm - nrog cov txheej txheem txheej engineered rau raws nraim lawv cov ntsiab lus tsis muaj zog: tsis muaj hydrogen embrittlement ntawm 12.9 steel, kev pab cuam rau hauv lub qhov (socket) liab thiab crease. xeb, thiab kev sib txhuam ruaj khov rau kev sib dhos meej. Qhia kom raug, lawv xa 720-1,000 ntsev tsuag teev nyob rau hauv 8-12 μm zaj duab xis, thiab coj qhov tsaus, matte tsos ntawm blackened bolts rau hauv tiag tiag corrosion-proof kev pab cuam.

Tsis Muaj. Tom ntej no.

Xov xwm tshiab