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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: TimTyler on August 10, 2015, 06:45:43 PM

Title: Fillister-head screw - M8X35 ZNS
Post by: TimTyler on August 10, 2015, 06:45:43 PM

Fillister-head screw : M8X35 ZNS : BMW# 07119901027

That the BMW part for the muffler clamp screw on K75's.

Anybody know what ZNS means?  The internet doesn't seem to have answers. Wonder if it's a heat rating.

Title: Re: Fillister-head screw - M8X35 ZNS
Post by: rbm on August 10, 2015, 11:27:00 PM

Probably zinc plated, for corrosion resistance in that application.  ZnS is chemical designation for Zinc Sulphate.
https://www.boltdepot.com/fastener-information/Materials-and-Grades/Materials.aspx

Title: Re: Fillister-head screw - M8X35 ZNS
Post by: TimTyler on August 11, 2015, 03:01:26 AM

Could be. A lot of the BMW hardware has that dull gray finish. I wonder if that is a hot dipped galvanized finish. Never seen it anywhere besides nuts and bolts on the bike.

Title: Re: Fillister-head screw - M8X35 ZNS
Post by: The Mighty Gryphon on August 11, 2015, 02:12:18 PM

Probably electroplated.  Too smooth for hot dip unless there is a process I haven't heard of.