Countersunk screw with hexagon socket head DIN 7991, 8.8 steel with silver zinc-flake coating (ZFSHL) - SCR-ISO10642-08.8-HS12-(ZFSHL)-M20X55

Countersunk screw with hexagon socket head DIN 7991, 8.8 steel with silver zinc-flake coating (ZFSHL)

Name: Countersunk screw with hexagon socket head DIN 7991, 8.8 steel with silver zinc-flake coating (ZFSHL)
Brand: Würth
SKU: 412242055

SCR-ISO10642-08.8-HS12-(ZFSHL)-M20X55

Art.-no. 412242055

EAN 4066781732048

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Countersunk screw with hexagon socket head DIN 7991, 8.8 steel with silver zinc-flake coating (ZFSHL)

Art.-no. 412242055

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Quantity

x 25 pcs

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Zinc-flake coatings are chromium(VI)-free corrosion protection coatings for commercial vehicle construction, construction machines, agricultural vehicles and equipment, and all other fields that have vehicle construction standard corrosion protection requirements.

Corrosion resistance for ZFSHL is:

Diameter ≥ M6 - 480h*

Diameter ≥ M10 - 720h*

* Guideline values: No base metal corrosion at points without thread in salt spray mist testing according to DIN EN ISO 9227 NSS.

The designation ZFSHL refers to the following corrosion coating:

Zinc-flake coating, with top coat, silver colour, with lubrication that alters the friction coefficient.

Adjusted friction coefficient range from 0.09 μ-0.14 μ due to top coat with integrated lubricating particles

Notice

DIN 7991 has been withdrawn and replaced by ISO 10642. There is some limited similarity (Some head heights and head diameters changed | Nominal diameter M18, M22, M24 removed | Stainless steels removed | Strength classes 10.9 and 12.9 added).

Countersinking angle:

M3 - M20: 90°

M22 and M24: 60°

Due to their head geometry, these screws can only be subjected to limited loads, see DIN EN ISO 898-1

Product information

Würth Catalogue

Datasheets(X)

Certificates/ Documents


Thread type x nominal diameter (d₁)	M20
Length (l₁)	55 mm
Head diameter (d_k)	36.75 mm
Head height (k₁)	10.16 mm
Internal drive (s₁)	HS12
Standards	ISO 10642
Material	Steel
Property class	08.8
Surface	Flake zinc silver
Corrosion protection period (3)	720 h
RoHS-compliant	Yes
Head type	Countersunk head
Drive type	Hexagon socket
Thread type	Metric thread
Thread form	Standard metric thread
Thread design	Full thread
Product class	A
Tightening torque 90% yield strength (1)	424 Nm
Min./max. resulting pre-load force (2)	50.6-101.2 kN
Disc with hardness to be used	≥ 200 HV
Nut to be used with strength class	≥ I8I

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