Grade 8.8 Steel Clamping Handle Screw (Long)

Grade 8.8 Steel (class 8.8) is the workhorse medium-carbon alloy grade for structural joints. When clamping handle screw (long) are specified in this grade, the dimensions remain per DIN 6336 / GN 313; the material determines corrosion behavior (requires plating (zinc) for corrosion protection) and the service temperature range (up to approx. +300 °C). Both are covered below with the size table.

Why Choose Grade 8.8 Steel for Clamping Handle Screw (Long) — DIN 6336 / GN 313 (Series 044)

The workhorse medium-carbon alloy grade for structural joints. For clamping handle screw (long) — din 6336 / gn 313 (series 044), this matters when requires plating (zinc) for corrosion protection is the primary requirement.

Mechanical & Physical Properties

Galvanic & Galling Considerations

For clamping handle screw (long) — din 6336 / gn 313 (series 044) in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.

Comparable Grades

For Clamping Handle Screw (Long) — DIN 6336 / GN 313 (Series 044), class 10.9 or 12.9 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.

Sizes of Clamping Handle Screw (Long) — DIN 6336 / GN 313 (Series 044) Available in Grade 8.8 Steel