These spacers are designed for use with (typically NAS bolts) in structural and non-structural assemblies where precise spacing, alignment, or load transfer is needed without threading. Key distinction: NAS1056 spacers are not threaded . They are precision-ground tubes. For threaded standoffs, see NAS1398 or NAS1399. 2. Dimensional Specifications (Inch System) All NAS1056 spacers are defined by three critical dimensions:
| Parameter | Symbol | Typical Range / Notes | |-----------|--------|------------------------| | | A | Matches NAS bolt diameter (e.g., #10, 1/4, 5/16, 3/8, 1/2 inch) | | Nominal OD | B | Fixed per dash number (see table below) | | Length | L | From 0.125″ to 2.000″ in 1/16″ increments (dash number indicates length in 16ths) | nas1056 spacers
1. What is NAS1056? NAS1056 is a military/aerospace standard (National Aerospace Standard) that defines the dimensional, material, and finish requirements for unthreaded, hollow, cylindrical spacers (also called standoffs or distance bushings). These spacers are designed for use with (typically
| ID (in) | Corresponding NAS Bolt Size | OD (in) | |---------|----------------------------|---------| | 0.147–0.152 | #6 | 0.250 | | 0.189–0.194 | #10 | 0.3125 (5/16) | | 0.252–0.258 | 1/4″ | 0.375 (3/8) | | 0.314–0.320 | 5/16″ | 0.500 | | 0.377–0.383 | 3/8″ | 0.5625 (9/16) | | 0.502–0.508 | 1/2″ | 0.750 | For threaded standoffs, see NAS1398 or NAS1399