Are you feeling a little standoffish?? Maybe these will help! Threaded spacers are called standoffs. Standoffs are useful for applications such as separating devices, connecting parts, and locating and guiding components in assemblies. Nylon: Corrosion resistant, tough, and resilient. Ideal in electrical and electronic assemblies. Withstands temperatures from -40° to +180° F. Rockwell hardness is R100. Tensile strength is 7600 psi. Aluminum: It's one-third the weight of steel. Mild resistance to corrosion. Rockwell hardness is B60. Tensile strength is 55,000 psi. Please see the Servos & Stuff: Servo Erector Set: 2-56 Hardware section for 2-56 Standoffs. Aluminum MF Hex (4-40, 1/2") $0.69 Nylon MF Hex (4-40, 1/2") $0.35 Aluminum FF Hex (4-40, 2.75") (out of stock, sorry) $0.79 Aluminum FF Hex (6-32, 2.0") $1.29 Aluminum MF Hex (4-40, 1.0") $0.99 Aluminum FF Hex (4-40, 1.0") $0.79 Aluminum FF Hex (6-32, 1.5") $1.19 Brass MF Hex (4-40, 1/2") $0.29 Copyright © 2003-2008 E-Clec-Tech. All rights reserved. All other materials and logos are copyrighted by their respective owners, or companies.