Content with Delta Coating

Washer size Bolt Size NL8 M8 NL10 M10 NL12 M12 NL16 M16 NL20 M20 NL22 M22 NL24 M24 NL27 M27 NL30 M30 NL36 M26 Internal diameter (id) 8.7 (+/-) 0.1 10.7 (+/-) 0.5 13.0 (+/-) 0.5 17.0 (+/-) 0.5 21.4 (+/-) 0.5 23.4 (+/-) 0.5 25.3 (+/-) 0.5 28.4 (+/-) 0.5 31.4 (+/-) 0.5 37.4 (+/-) 0.5 Outside diameter (od) 13.5 (+/-) 0.2 16.6 (+/-) 0.2 19.5 (+/-) 0.2 25.
Read more about Nord-lock washers - Dimensions for popular sizes of steel washers ↬

Self Colour / Black Finish Finish Specification S/C Self Colour Bare / Blackened (Black Oxide) Lightly Oiled products are supplied in a black finish with a light covering of oil Hot Dip Galvanised (HDG) Finish Specification HDG Hot Dip Galvanised EN ISO 10684 EN 1461 BS 7371-6 heavy coating deposits of molten zinc (40-180 microns) suitable for long term corrosion protection; a thicker coating deposit gives a longer life expectancy; it is most suitable for structural steelwork; the coating will affect the thread fit and assembly of fasteners due to the non-uniformity of the coating and the average coating thickness of 50-80 microns; in general the fullnuts are tapped oversize after the plating to allow for this but in some cases the bolt threads are undersize prior to coating; high temperature may affect the metallurgical properties of high tensile metals, i.
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