Heres a helpful little list of items that McMaster sells used in Rocketry.
G-10 FR4 Sheets.Epoxy glue Gun System.(great for inside fillets) U-Bolts. Eye bolts. Qick Links Nylon Shear pins(2-56 screws). O-Rings. Socket Head cap screws. Nuts(as in Nuts and Bolts). Wing nuts. Blind Nuts(tee nuts). Threaded Rod. Clear Protective Cases for Motors. Motor lubrication.