TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 F–6 F–5 FASTENER GRADE — CONTINUED Table F–4 SAE SCREW AND BOLT MARKINGS SCREWS BOLTS SAE grade 2 No markings SAE grade 6 Four radial dashes 90° apart SAE grade 3 Two radial dashes 180° apart SAE grade 7 Five radial dashes 72° apart SAE grade 5 Three radial dashes 120° apart SAE grade 8 Six radial dashes 60° apart MARKINGS ON HEX LOCKNUTS Grade A – no marks Grade A – no marks Grade A – no notches Grade B – three marks Grade B – letter B Grade B – one notch Grade C – six marks Grade C – letter C Grade C – two notches