DIN6923 Hex Flange Nut vs DIN934 Hex Nut: Which Fits Your Joint?

Comparison at a glance

The DIN6923 hex flange nut has a wide flange near one end. It acts as an integrated non-spinning washer and spreads pressure over a larger area of the secured material. The DIN934 hex nut uses the conventional hex-nut format and covers a wider listed size range, which helps procurement teams covering larger thread diameters.

Where the DIN6923 hex flange nut fits

A flange nut suits a joint where the nut needs a built-in load-spreading surface. The range covers M5 through M20 sizes in carbon steel, with plain, zinc plated, black, and HDG finish options. Serrated and non-serrated styles are available.

Picture a general industrial assembly where the clamped material needs pressure distributed across a wider area. The integrated flange reduces the need to handle a separate washer during installation. For a joint exposed to vibration, the serrated style is the option to discuss because its serrations bite into the installed material, making the nut less likely to loosen over time due to vibration.

Choose the DIN6923 hex flange nut when the flange form matches the joint design and the required thread sizes fall within M5-M20.

Where the DIN934 hex nut fits

The DIN934 hex nut covers M5 through M64. Its carbon steel options include Q195, 1035, 1045, and 10B21, with grades 4, 6, 8, 10, and 12. Finish choices include plain, black, zinc plated, HDG, and Dacromet.

The product is used in heavy industry, general industry, and automotive industry applications. Its size range suits procurement programs that need one hex-nut family across small and large assemblies.

Choose the DIN934 hex nut when the required diameter is above M20 or when the joint specification calls for a DIN934 hex nut with a separate washer arrangement.

Dimensions for overlapping metric sizes

The two product lines share the metric sizes below. Their nut height, m, and width across flats, S, are shown together. The DIN6923 hex flange nut also has a flange diameter, Dc, because its design includes an integrated flange.

Match the exact size and pitch to the bolt before ordering. DIN934 sizes have multiple pitch options at several diameters, so the purchase specification should include the thread pitch.

Material and finish selection

Both options use carbon steel. DIN934 provides named carbon steel choices and grades, while DIN6923 uses carbon steel and lists tolerance 4H. Finish selections overlap at plain, zinc plated, and HDG. DIN6923 also lists black, while DIN934 lists black and Dacromet.

For a replacement order, match the new nut to the existing bolt thread, required size, and surface specification. A finish change should be treated as a joint specification decision when the assembly includes other coated or plated parts.

Recommendation for purchasing teams

Select the DIN6923 hex flange nut for M5-M20 joints where an integrated flange is part of the joint design or where a wider contact area under the nut is useful.

Select the DIN934 hex nut for orders that extend beyond M20, require sizes up to M64, or call for the DIN934 product family with its listed carbon steel grades and finish options.

Send the supplier the standard, thread diameter, pitch, material or grade, surface finish, quantity, and any drawing or sample for a special or non-standard requirement.