Dacromet-Coated Socket Head Cap Screws

2026-11-03

1. Mawu Oyamba

Socket mutu cap screws, yokhazikika mkati ISO 4762 / DIN 912 - ndi mabawuti osankha kulikonse komwe kukakwera kwambiri, mitu yophatikizika, ndi kuwongolera kolondola kwa torque kumakumana. Chifukwa amapangidwa m'makalasi azinthu 8.8, 10.9 makamaka 12.9, mabawutiwa amagwira ntchito pamlingo waukulu wa mphamvu zawo zokolola, ndipo mphamvu yomweyo imawapangitsa kukhala osatetezeka kwambiri hydrogen embrittlement, stress dzimbiri akulimbana, ndi dzimbiri lomwe limayambira pamutu wa fillet ndi makoma a hex socket.

Dacromet ❖ kuyanika - sanali electrolytic zinc-aluminium flake ndondomeko yofotokozedwa ndi Mtengo wa ISO 10683 ndi Chithunzi cha ASTM F1136 - imafotokoza ndendende zofooka izi. Mufilimu yopyapyala ya 8-12 μm imapereka maola 720 mpaka 1,000 a kukana kupopera mchere poyamba. dzimbiri lofiira (ASTM B117 NSS), sipanga chiwopsezo cha hydrogen embrittlement panthawi yokonza, ndikusunga geometry yolondola ya hex socket ndi 6 g kulekerera kwa ulusi kuti socket head cap screws zimadalira.

2. Bolt Geometry ndi Zopangira Zopangira

Socket head cap screw ndi bawuti yolimba kwambiri yokhala ndi mutu wa cylindrical ndi drive yamkati ya hexagon socket:

Mutu wa cylindricalndi a kugogoda circumferential pamwamba; mutu m'mimba mwake dk ≈ 1.5 × d - pafupifupi 30-40% yaying'ono kuposa bawuti yamutu wa hexagon yofanana, kulola mawonekedwe ophatikizika, otsekeka;
Mutu-to-shank fillet, malo osinthira otopa kwambiri pomwe kupsinjika kumakhala kwakukulu;
Ulusi wonse kapena ulusi wochepa(zosalala shank) masitaelo; zomangira za ulusi wapang'ono zimayika ndege yometa ubweya mu shank yopanda ulusi kuti ikhale yokwera kwambiri;
Zosintha zama point: flat (chamfered) mfundo muyezo; galu pointndi cone point kwa malo ndi kutseka ntchito.

Poyerekeza ndi ma bolt a hex, SHCS imapanga apamwamba kutsitsa kwa makokedwe omwewo chifukwa cha kuyendetsa bwino kwa socket, ndipo amayikidwa ndi makiyi a hex, ma wrenches a torque, kapena madalaivala a hex oyendetsedwa ndi magetsi - kuwapanga ma bolts mu zida zamakina, jekeseni wa jekeseni, ma hydraulic manifolds, jigs ndi zosintha, ndi ma robotic.

3. Corrosion Performance Kuyerekeza

Kupaka pa kalasi 8.8-12.9 SHCS	Makulidwe	Kupopera mchere ku dzimbiri lofiira (ASTM B117)	Chiwopsezo cha hydrogen embrittlement	Zolemba
Black oxide (wakuda), wothira mafuta	<1 μm	<24h	Palibe	Zodzikongoletsera zokha; mafuta amatsuka
Zinc phosphate + mafuta	3-5 m	≈ 48-72 h	Palibe	Wamba "wakuda" mapeto, moyo yochepa
Electro-galvanized Zn12, Cr(VI)-free	12 mm	≈ 192 h	Pamwamba (12.9 osavomerezeka)	Soketi ndi ulusi woonda-wokutidwa
Zinc-nickel alloy electro-plate	8-12 m	≈ 480-720 h	Wapakati	Mtengo wapamwamba; amafunikira post bake
Dacromet DAC 320 (Kalasi 2)	8 mm	≈ 720 h	Pafupifupi palibe	Silver gray
Dacromet DAC 500 / wakuda	10-12 m	≈ 1,000 h	Pafupifupi palibe	Kumaliza kwakuda kumafanana ndi mndandanda wakuda

6. Miyezo ndi Mtundu Wofananira wa Mankhwala

Mfundo zazikuluzikulu: ISO 4762 / DIN 912 (zomangira zamutu wa socket), ISO 898-1 (makina katundu), ISO 10683: 2018 (zovala zopanda electrolytic zinc flake), Chithunzi cha ASTM F1136, Chithunzi cha ASTM B117, ISO 4042 (electroplating ndi HE chitsogozo), Mtengo wa 267-28 ndi GB/T 70.1 / GB/T 5267.3.

Parameter	Common Range
Diameter	M3 – M42 (No.4 – 1-1/2”)
Utali	6 - 300 mm, ulusi wonse kapena ulusi wochepa
Kalasi ya katundu	8.8 / 10.9 / 12.9
Kalembedwe kamutu	Standard (ISO 4762), mutu wotsika (DIN 6912), mutu wopindika
Mfundo	Lathyathyathya / galu malo / cone point
Kupaka	DAC 320 / DAC 400 / DAC 500; siliva imvi kapena wakuda; Cr (VI) - wopanda
Kulekerera kwa ulusi	6g, ulusi wokutidwa popanda kugogodanso

7. Mapulogalamu ndi Chitsogozo Chosankha

1.Fananizani zokutira ku mphamvu: kwa kalasi 10,9 ndi 12,9 mabawuti, amaumirira sanali electrolytic nthaka flake (Dacromet / Geomet) kuthetsa embrittlement haidrojeni;

2.Replace black oxide mwanzeru: tchulani Dacromet wakuda pamene makasitomala akufuna mawonekedwe akuda ndi chitetezo chenicheni cha dzimbiri;

3.Verify ❖ kuyanika kalasindi maola a NSS (DAC 320 ≈ 720 h; DAC 500 ≈ 1,000 h) ndikupempha lipoti la kuyesa kwa wopanga zokutira;

4.Tsimikizirani Cr(VI)-free passivation(trivalent chromium) pakutsata kwa RoHS / ELV;

5.Check friction data: pezani nut factor ndi lipoti la coefficient-of-friction la msonkhano woyendetsedwa ndi torque;

6.Malizani dongosolo: gwiritsani ntchito mtedza wokutidwa, zochapira, ndi zoyikapo zapampopi zomwe zimagwirizana kuti mupewe zomangira zosakanikirana.

8. Mapeto

Zomangira zomata za socket socket head caps zimagwirizanitsa mphamvu zamakina amphamvu kwambiri-zolinga zambiri - mitu yozungulira yozungulira, yogwira bwino ntchito ya hex socket drive, kuthekera kodzaza kwambiri - yokhala ndi makina opaka opangidwa kuti akwaniritse zofooka zawo: palibe hydrogen embrittlement pazitsulo 12.9, kuphimba mu socket, poyikira ndi malo ozungulira, malo ozungulira ndi ofiira. kukhazikika kwa msonkhano wolondola. Zodziwika bwino, zimapereka maola 720-1,000 opopera mchere mufilimu ya 8-12 μm, ndikubweretsa mawonekedwe amdima, akuda a ma bolts akuda kuti agwire ntchito yoteteza dzimbiri.

Palibe. Kenako.

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