Rothe Erde GmbH - Minimum engagement for blind hole threads for medium tolerance class (6 H)

Technical bases

Minimum engagement for blind hole threads.
Applies to medium tolerance class (6 H)

Deviating tolerance classes require specific insertion lengths

Bolt strength class Rate of thread d/P	8.8 < 9	8.8 ≥ 9	10.9 < 9	10.9 ≥ 9	12.9 < 9	12.9 ≥ 9
St 37	1.0 · d	1.25 · d
St 50, C 45 N, 46 Cr 2 N, 46 Cr 4 N	0.9 · d	1.0 · d		1.2 · d		1.4 · d
C 45 V, 46 Cr 4 V, 42 CrMo 4 V	0.8 · d	0.9 · d		1.0 · d		1.1 · d

d -	Thread O.D. [mm] Bolts with metric ISO-thread (standard thread)
P -	Pitch [mm] up to M 30: d/P < 9 > M 30: d/P ≥ 9

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