The Spark Plug, cataloged under National Stock Number 2920-00-580-4931, is classified within Federal Supply Class 2920 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is Allied-Signal Inc Autolite Div. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 2920-00-580-4931 |
| Primary Part Number | SH20A |
| Item Name | Spark Plug |
| FSC / FSG | 2920 / 29 — No Item Name Available |
| Manufacturer | Allied-Signal Inc Autolite Div |
| Status | CANCELLED |
| DC Resistance Rating in Ohms | 1000.0 NOMINAL |
| Electrode Style | TRIPLE GAP GROUND ELECTRODE |
| Barrel Inside Diameter | 0.459 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN |
| Shield Thread Length | 0.250 INCHES NOMINAL IN |
| Top to Shield Thread Distance | 0.120 INCHES NOMINAL IN |
| Terminal Sleeve Inside Diameter | 0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN |
| Seat Major Diameter | 0.965 INCHES NOMINAL IN |
| Height Above Mounting Surface | 2.500 INCHES MINIMUM AND 2.624 INCHES MAXIMUM IN |
| Top to Terminal Contact Distance | 1.000 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN |
| Thread Size and Series/type Designator | 5/8-24 UNEF SHIELD |
| Body Style | ELECTRICALLY SHIELDED, PARTIAL INSULATOR, GASKET SEAT |
| Reach Length | 0.527 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| Usage Design | AIRCRAFT ENGINE |
| Width Across Flats | 0.870 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
NSN 2920-00-580-4931 is a Spark Plug, manufactured by Allied-Signal Inc Autolite Div, classified under FSC 2920 (No Item Name Available). Status: cancelled.
NSN 2920-00-580-4931 has 2 cross-referenced part numbers: SH20A (Hughes Missile Systems Co San Diego), SH20A (Allied-Signal Inc Autolite Div).
There is 1 known substitute for 2920-00-580-4931: 3439-00-629-2697. Verify interchangeability with system specifications before substitution.
Key specifications for SH20A: DC Resistance Rating in Ohms: 1000.0 NOMINAL; Electrode Style: TRIPLE GAP GROUND ELECTRODE; Barrel Inside Diameter: 0.459 INCHES MINIMUM AND 0.479 INCHES MAXIMUM IN; Shield Thread Length: 0.250 INCHES NOMINAL IN. 15 total characteristics are documented in the Federal Logistics Information System.
NSN 2920-00-580-4931 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.