Build Secrets
Use the right hardware. Some basic kits do not include hardware for attaching suspension, engines, and so on, while others supply dime-store bolts that may not meet your needs. Bolts that have no marks on their heads are for low-strength applications and probably have no use on a kit car. Bolts with three small hash marks are SAE Grade 5 (medium-strength) bolts, and they are OK for nonstructural applications such as trim and appearance parts. Six hash marks indicate a Grade 8 SAE bolt, which is much stronger in tension but more brittle. For high-performance brake and suspension applications, you may prefer NAS/MS (aircraft or military-spec) bolts. For a good description, consult Carroll Smith’s Nuts, Bolts and Fasteners and Plumbing Handbook (Motorbooks International), an invaluable reference book. Every kit builder should have a copy of this book.
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