RoHS compliance

All of our products are manufactuRed Rust for reliability and consistently high quality and are RoHS compliant as standard.

 

Our bright zinc based platings are all high quality trivalent clear chromate based finishes.

 

What is Hydrogen Embrittlement?

 

All components, which are subjected to electroplating, may absorb hydrogen that is evolved during the plating process.

 

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 embrittlement problems.

 

In safety critical situations the only way we can guarantee the performance of hardened carbon steel parts is to provide the part either unplated or with a non-electroplated coating.

 

For property class 12.9 and above fasteners we highly recommend that parts are supplied with a non- electroplated finish (i.e. Zinc Flake).

 

Give us a call to discuss alternative finishes where extra corrosion protection is required or if you are worried about possible hydrogen embrittlement problems.

 

 

Related Links

 

Installation Guides

 

Hardness Tables

 

Thread Cross Reference

 

Max Rec. Tightening Torque

 

Material Thickness Chart

 

Plating Specs

 

Galvanic Corrosion Chart

 

RoHS Info

 

Reach Info

 

If you can't find the information you need on our site or if you require specific application or product advice, give us a call on:

+44 (0) 1302 836010

Or send us an e-mail with your questions to:

technical@npfasteners.com

 

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Available Finishes
and Specifications

Northern Precision Ltd - Fasteners for sheet metal and plastics, Turned and Cold Formed Products.

Finish Code
(Suffix)

 Coating Description Colour

RoHS
Compliant

Corrosion
Resistance

(Salt Spray Hrs)

Potential
for Hydrogen
Embrittlement
Electroplated Finishes

ZC6
GC6
SZ6

 Zinc + Hexavalent
Yellow Chromate 		Yellow No

72 to White Corrosion

144 to Red Rust

 Yes
(Our standard finish for fasteners)

ZI

GZ

SZ

 Zinc + Trivalent
Clear Chromate 		Silver Yes 12 to White Corrosion
96 to Red Rust		 Yes
ZTBL48 Zinc + Trivalent
Blue Chromate 		Silver/Blue Yes 48 to White Corrosion
120 to Red Rust		 Yes
ZTH96 Zinc + Trivalent
Heavy		 Iridescent Yes 96 to White Corrosion
240 to Red Rust		 Yes
ZTS96 Zinc + Trivalent
Seal 		Silver Yes 96 to White Corrosion
384 o Red Rust 		Yes
ZTBK120 Zinc + Trivalent
Black 		Black Yes

120 to White Corrosion

240 to Red Rust

 Yes
ZNTC360 Zinc Nickel +
Trivalent Clear 		Matt Silver Yes 360 to White Corrosion
600 to Red Rust 		Yes
ZITB240 Zinc Iron +
Trivalent Black 		Black Yes

240 to White Corrosion

480 to Black

Yes
ET Tin Silver to
Dull Silver 		Yes N/A Yes
 
Mechanical Finishes
MZTH Zinc + Trivalent
Heavy		 Iridescent Yes 48 to White Corrosion
120 to Red Rust		 No
 
Dry Film Lubricants
MD Molybdenum
Dry Film 		Grey/Black Yes Variable N/A
 
Zinc Flake Finishes
Dacromet Dacromet® Silver-Grey No

240 to White Corrosion

480 to Red Rust

No
Geomet Geomet® Silver-Grey Yes

240 to White Corrosion

1500 to Red Rust

No
DeltaT&S Delta Tone®
and Seal 		Silver-Grey Yes

240 to White Corrosion

480 to Red Rust

No
DeltaP Delta Protekt® Silver-Grey Yes

840 to Red Rust

No

 

Information courtesy of Anochrome Group design guide.