The Ladder,safety Step, cataloged under National Stock Number 5440-01-306-2648, is classified within Federal Supply Class 5440 (No Item Name Available) of the Prefabricated Structures and Scaffolding group. The primary manufacturer of record is Lockheed Martin Corp. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5440-01-306-2648 |
| Primary Part Number | ST49D8 |
| Item Name | Ladder,safety Step |
| FSC / FSG | 5440 / 54 — No Item Name Available |
| Manufacturer | Lockheed Martin Corp |
| Status | ACTIVE |
| Top Step Width | 10.000 INCHES NOMINAL IN |
| Handrails | NOT INCLUDED |
| Locking Feature | INCLUDED |
| Base Overall Length | 31.000 INCHES NOMINAL IN |
| Wheel Diameter | 2.000 INCHES NOMINAL IN |
| Intermediate Step Width | 7.000 INCHES NOMINAL IN |
| Opposing Steps | NOT INCLUDED |
| Distance From Base to Top Step | 38.000 INCHES NOMINAL IN |
| Rolling Element Type and Quantity | 4 RETRACTABLE SWIVEL CASTER |
| Material | STEEL |
| Step Quantity | 4 |
| Step Length | 16.000 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 5440-01-306-2648 is a Ladder,safety Step, manufactured by Lockheed Martin Corp, classified under FSC 5440 (No Item Name Available). Status: active.
NSN 5440-01-306-2648 has 4 cross-referenced part numbers: ST49D8 (Lockheed Martin Corp), ST49D8-3 (Lockheed Martin Corp), 418X (Ballymore Company, Inc), P4S (Ballymore Company, Inc).
There are 2 known substitutes for 5440-01-306-2648: 4730-00-894-2493, 5440-01-305-9982. Verify interchangeability with system specifications before substitution.
Key specifications for ST49D8: Top Step Width: 10.000 INCHES NOMINAL IN; Handrails: NOT INCLUDED; Locking Feature: INCLUDED; Base Overall Length: 31.000 INCHES NOMINAL IN. 15 total characteristics are documented in the Federal Logistics Information System.