Schletter Serrated M10 Flange Nut, A4 Stainless Steel | 943912-010

Description

The Schletter Serrated M10 Flange Nut is a self-locking fastener manufactured to DIN 6923 from A4 stainless steel, used throughout Schletter mounting systems wherever a secure, vibration-resistant M10 connection is required.

An integrated serrated flange bites into the mating surface as the nut is tightened, resisting the loosening that can otherwise occur under wind-induced vibration on roof-mounted PV arrays over years of service.

M10

Thread Size

DIN 6923

Standard

A4 Stainless

Material Grade

15mm

Wrench Size (A/F)

21.8mm

Flange Diameter

10mm

Overall Height

Key Features

Serrated Anti-Loosening Flange

The integrated serrated flange grips the mating surface as it's tightened, helping resist loosening under the vibration and thermal cycling typical of roof-mounted arrays.

Marine-Grade A4 Stainless Steel

Manufactured from A4 stainless steel, offering higher corrosion resistance than standard A2 grade — well suited to exposed coastal or high-humidity installations.

DIN 6923 Manufacturing Standard

Produced to the recognised DIN 6923 flange nut standard, giving installers a documented specification for structural sign-off.

Wide-Ranging Compatibility

As a standard M10 fastener, it pairs with Schletter's M10 bolts and hanger bolt kits across multiple rail and roof hook systems.

Reduces Maintenance Call-Backs

The anti-loosening design helps reduce the need for retightening visits over the working life of the installation.

15mm Wrench Size

Tightened using a standard 15mm spanner or socket, consistent with other Schletter M10 flange hardware.

Technical Specification

Fastener Specification

Thread Size

M10

Manufacturing Standard

DIN 6923

Flange Diameter

21.8 mm

Overall Height

10 mm

Wrench Size (Across Flats)

15 mm

Locking Feature

Serrated flange, anti-loosening

Materials

Material

A4 stainless steel

Corrosion Resistance

Suitable for coastal / high-humidity exposure

Frequently Asked Questions

What makes this nut resistant to loosening?

The nut has an integrated serrated flange that digs into the surface it is tightened against, providing mechanical resistance to loosening from vibration and thermal movement over time.

Why A4 rather than A2 stainless steel?

A4 stainless steel offers higher resistance to chloride-induced corrosion than standard A2 grade, making it a stronger choice for coastal sites or locations with high airborne salinity.

What wrench size does this nut need?

A 15mm spanner or socket fits the flange nut's across-flats dimension.

What standard is this nut manufactured to?

It is produced to DIN 6923, the recognised specification for hexagon flange nuts with serrations.

Can this nut be reused if a connection needs to be undone and retightened?

Serrated flange nuts are generally intended for a secure, long-term connection. If a joint is disturbed, replacing the nut ensures the serrations continue to provide full anti-loosening performance.

BTU Calculator

BTU & WATT Calculator

Room Dimensions

Length (in m):

Width (in m):

Height (in m):

Room Type

Living Room

Bedroom

Kitchen

Bathroom

Conservatory

Hallway

Glazing Type

Single Glazed

Double Glazed

Triple Glazed

External Walls

0 Wall

1 Wall

2 Walls

3 Walls

4 Walls

Insulation Level

Poor

Average

Good (New Build)

Calculate

Required Heating

0

Watts

0

BTUs