ZTH96
Yes
Yes
Electro-plated zinc + heavy Cr3 chromate
Iridescent
96 to white corrosion 240 to red rust
No
Yes
Electro-plated zinc + yellow Cr6 chromate
Yellow
72 to white corrosion 144 to red rust
ZC6 GC6 SZ6
RoHS Compliant
Potential for hydrogen embrittlement
Finish Description
Colour
Corrosion resistance (salt spray hours)
Finish Code (Suffix)
Yes
Yes
Electro-plated zinc + clear Cr3 chromate
Silver grey to shiny grey
12 to white corrosion 96 to red rust
ZI GZ SZ
Yes
Yes
Electro-plated zinc + blue Cr3 chromate
Silver with blue tinge
48 to white corrosion 120 to red rust
ZTBL48
Yes
Yes
Electro-plated zinc + Cr3 chromate + sealant
Silver
96 to white corrosion 384 to red rust
ZTS96
Yes
Yes
Electro-plated zinc + black Cr3 chromate
Black
120 to white corrosion 240 to red rust
ZTBK120
Yes
Yes
Electro-plated nickel + clear Cr3 chromate
Matt silver
360 to white corrosion 600 to red rust
ZNTC360
Yes
Yes
Electro-plated zinc iron + black Cr3 chromate
Black
240 to white corrosion 480 to red rust
ZITB240
Yes
Yes
Electro-plated tin
Shiny to dull silver
N/A
ET
Yes
No
Mechanical zinc + heavy Cr3 chromate
Iridescent
48 to white corrosion 120 to red rust
MZTH
Yes
No
Molybdenum disulphide dry film lubricant
Dark grey
Variable
MD
No
No
Dacromet®
Metallic silver
240 to white corrosion 480 to red rust
Dacromet
Yes
No
Geomet®
Silver grey
240 to white corrosion 720 to red rust
Geomet
Yes
No
Deltatone® + sealant
Silver grey
240 to white corrosion 480 to red rust
DeltaTS
Yes
No
Deltaprotect®
Silver grey
840 to red rust
DeltaP
Type
Electro-plated finishes Mechanically deposited / dipped/sprayed  finishes & coatings
ZI, GZ and SZ suffixes are our standard electro-plated zinc finishes on our stocked range of fasteners.
Other finishes are available to suit your specific requirements.
About the potential for hydrogen embrittlement All components, which are subjected to electro-plating, may absorb hydrogen that is evolved during the plating processes.   The absorption of hydrogen could potentially lead to a premature failure of the component due to hydrogen embrittlement.   Components manufactured from carbon steel that are case or through-hardened are most at risk and as a precaution we bake our fasteners to industry standards to minimise the risk of failure. However, we cannot fully guarantee every component against hydrogen embrittlement problems in service.   In safety critical situations the only way we can guarantee the performance of hardened carbon steel parts is to provide the part either self-colour or with a mechanically applied or dipped finish.   For property class 12.9 and above fasteners we highly recommend that parts are supplied with a mechanically applied or dipped finish.   Give us a call to discuss alternative finishes where extra corrosion protection is required or if you are worried about possible hydrogen embrittlement problems.
NP
NORTHERN PRECISION LTD
Specialist Fasteners for Sheet Metal
+44 (0) 1302 836010
+44 (0) 1302 836012
Tel:
Fax:
sales@npfasteners.com
NP
Contact us You can contact us using any of the methods below. Unit 3 Durham Lane Armthorpe Doncaster South Yorkshire DN3 3FE England +44 (0)1302 836010 +44 (0)1302 836012 sales@npfasteners.com
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NORTHERN PRECISION LTD
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