Product Overview

Prime Line Hex Jam Nuts, A563 Grd A Zc, Package Of 50. Size: 5/16 Inch-18. Similar In Shape And Function To A Standard Finished Hex Nut But Is About Half As Thick. Used As A Second Nut To "Jam" Or Prevent The Main Nut From Loosening. Can Also Be Used In Place Of A Standard Finished Hex Nut In Cases Where A Standard Nut Will Not Fit. If Using One Thin Nut And One Standard Nut, The Thinner Nut Goes In First. Thread Type: Coarse, Thread Class: Unc-2b. Specification(S) Met: Asme B1.1 & Sae A563. Mfg #9075864

• Size: 5/16 Inch-18
• Similar In Shape And Function To A Standard Finished Hex Nut But Is About Half As Thick
• Used As A Second Nut To "Jam" Or Prevent The Main Nut From Loosening
• Can Also Be Used In Place Of A Standard Finished Hex Nut In Cases Where A Standard Nut Will Not Fit