Free Resource · EN 1993-1-8 §3 + §6.2.4 · SI Units
Bolt Connection
Design Cheatsheet
4 pages: bolt categories A–E, shear/tension/bearing resistance tables (M12–M30, grades 4.6–12.9), combined interaction check, slip resistance by friction class, prying action T-stub Mode 1/2/3.
Categories A–E
EN 1993-1-8 Table 3.4
M12 · M16 · M20 · M24 · M27 · M30
Grades 4.6 · 8.8 · 10.9 · 12.9
Slip resistance class A–D
T-stub Mode 1/2/3
Preview — 4 pages
Page 1
Bolt Categories A–E
- Table 3.2 design checks per category
- Cat. A bearing, B/C slip-resistant
- Cat. D/E non/preloaded tension
- Decision tree — which category?
- Fv,Rd, Ft,Rd, Fb,Rd, Bp,Rd formulas
Page 2
Resistance Tables
- Shear Fv,Rd: M12–M30 × 4.6–12.9
- Threads-in vs shank-in shear plane
- Tension Ft,Rd + preload Fp,C
- αb factor chart
- γM2 by NA (EN/NL/DE/BE)
Page 3
Combined & Slip
- Eq. 3.2 interaction (shear+tension)
- Worked example M20 8.8
- Fs,Rd by friction class A–D
- Slip with tension: 0.8·Ft,Ed reduction
- Packing + long joint reductions
Page 4
Prying & Detailing
- Prying trigger geometry
- T-stub Mode 1/2/3 formulas
- Effective lengths leff (Table 6.4/6.5)
- Minimum spacings e1/e2/p1/p2
- Hole clearances Table 3.1
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Bolt categories, shear resistance, tension, bearing, combined interaction, slip resistance, prying action — the core EN 1993-1-8 §3 checks. FrameAI runs the full bolt design automatically and exports fabrication drawings with part marks.