Thread runout vs Thread undercut
BASIC STANDARDS: Run-out and undercut for fasteners with metric (ISO) screw thread.
Specifies dimensions for thread run-outs and thread undercuts for bolts, screws and similar components with external or internal ISO metric (coarse or fine pitch) thread as in DIN 13-1 and DIN ISO 261.
DIN 13-1 General purpose ISO metric screw threads – Nominal sizes for 1 mm to 68 mm diameter
coarse pitch threads
DIN 76-2 Thread run-outs and thread undercuts for pipe threads conforming to ISO 228-1
DIN 76-3 Thread run-outs and thread undercuts for trapezoidal threads, buttress threads, knuckle
threads and other coarse pitch threads
DIN EN 28839 Mechanical properties of fasteners – Bolts, screws, studs and nuts made of non-ferrous metals (ISO 8839 : 1986)
DIN 76-1 : 2004-06
DIN EN ISO 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts,
screws and studs (ISO 898-1 : 1999)
DIN ISO 261 ISO general purpose metric screw threads – General plan (ISO 261 : 1998)
ISO 3508 : 1976 Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262
ISO 4755 : 1983 Fasteners – Thread undercuts for external metric ISO threads
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