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M8-1.25 hex nut steel class 12 black oxide finish 13 mm across flats 6.5 mm high

Zoro Select

Zoro Select M04190.080.0001 Hex Nut M8-1.25 Steel Class 12 Black Oxide

SKU CH-S4HS-WKH6F

M8-1.25 Class 12 steel hex nut with black oxide finish, 13 mm width and 6.5 mm height to DIN 934 standard

  • Product typeNuts
  • Class 12 steel delivers high clamping strength
  • M8 × 1.25 metric thread fits standard hardware
  • DIN 934 dimensional standard ensures precise interchangeability
  • 13 mm hex width allows common tool engagement
  • Black oxide finish adds mild corrosion resistance

M8-1.25 Class 12 Hex Nut

This Zoro Select hex nut is a metric M8 fastener with a 1.25 mm thread pitch. It is manufactured from steel rated to property class 12 and finished with a black oxide coating. The nut conforms to DIN 934 dimensional standards and DIN 267-4 material quality standards.

High-strength metric fastening

The component suits applications that require a class 12 metric hex nut in the M8 size. Buyers who need a different thread pitch, a larger or smaller diameter, or a lower property class should look at alternative fasteners. The plain finish and right-hand thread orientation are fixed characteristics of this item.

Class 12 strength rating

The decisive specification is the property class 12 designation, which defines the nut's proof load and hardness for high-strength bolting. This rating determines whether the fastener meets the structural requirements of the joint. Confirm the required class before purchase.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $23.99
Pricier than about 56% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameZORO SELECT
Product typeNuts

Questions about this item

What spanner size fits the 13 mm hex on this M8 nut?

A 13 mm spanner or socket matches the hex width exactly, giving full contact across the flats.

Which face should contact the joint first when threading the nut onto an M8×1.25 bolt?

Start the nut by hand until the bearing face sits flush, then tighten with a 13 mm tool to avoid cross-threading the 1.25 mm pitch threads.

When should the nut be replaced if the black oxide coating shows wear?

Replace the nut if the coating is worn through to bare steel, if threads are damaged, or if the joint has been subjected to overload or impact loading.

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