Almen strips are classified into 3 types: ‘A’, ‘N’, and ‘C’. They differ in their thickness but have the same width and length. The type of strip is usually specified by the part designer.
“A” strips are used for medium intensity applications. “A” strips are predominantly used for shot peening with cast shot or cut wire shot.
“N” strips are used for low intensity applications. “N” strips are used usually for glass bead and ceramic bead peening.
“C” strips are used for high intensity applications.
Grade 3 – Bulk (A-3™, N-3™, C-3™)
Grade 3 strips are guaranteed to meet the requirement of MIL-S-13165 (now AMS-S-13165). Type A-3 strip is guaranteed to meet National Stock Number NSN 6635-00-512-1892. Grade 3 strips are economically priced and bulk packaged.
Grade 2 – Standard (A-2™, N-2™, C-2™)
Meets AMS-S-13165. Excess oil is removed from the Grade 2 Standard strips. The strip surfaces are then visually inspected for score marks, scratches, nicks, burrs, pits and rust. Strips are certified using a sampling inspection plan for hardness, length, width, thickness, and flatness. A dated certification of compliance is issued, signed and archived. We then package “A” and “N” strips in groups of 50 and “C” strips in groups of 25.
Grade 1 – Premium Grade (A-1™, N-1™, C-1™)
Meets SAE J442. Electronics Incorporated performs all the inspection and packaging operations listed for Grade 2 strips. Strips are sample inspected for flatness (±.001-inch) on each side. A dated certification of compliance is issued, signed and archived. The Premium Grade 1 strips are identified by batch control number which provides traceability.
Grade 1S – Special Grade (A-1S™, N-1S™)
Meets SAE AMS 2432B. In addition to requirements for Premium Grade 1, the Grade 1S strips are inspected to ±.0005-inch flatness tolerance of AMS 2432B. A dated certification of compliance is issued, signed and archived.
* AMS-S-13165 has been cancelled with instructions to use AMS 2430. For more information see Almen Strips FAQ.
A-3, A-2, A-1, A-1S, N-3, N-2, N-1, N-1S, C-3, C-2, C-1 are trademarks owned by Electronics Inc.