The Unit,ignition Advance, cataloged under National Stock Number 2920-00-040-0498, is classified within Federal Supply Class 2920 (Engine Electrical System Components, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Renk America Llc Div Renk America. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2920-00-040-0498 |
| Primary Part Number | 525430 |
| Item Name | Unit,ignition Advance |
| FSC / FSG | 2920 / 29 — Engine Electrical System Components, Nonaircraft |
| Manufacturer | Renk America Llc Div Renk America |
| Status | ACTIVE |
| General Characteristics Item Description | INTERNAL INVOLUTE SPLINE DATA'NUMBER OF TEETH 20,DIAMETRAL PITCH 16/20,PRESSURE ANGLE/AT GIVEN PITCH DIAMETER/20 DEGREES,CIRCULAR PITCH 0.1963 IN.,BASE CIRCLE DIAMETER 1.1746 IN.,CHORDAL SPACE WIDTH 0.0981 IN./MACHINE TO 0.981-0.1002/PERMISSABLE BACKLASH 0.002 TO 0.006 IN. WHEN MESHING WITH MATING SPLINE,MAXIMUM TOOTH SPACING ERROR REFERENCED TO PITCH LINE 0.003 IN. BETWEEN ADJACENT TEETH,0.0007 IN. CUMULATIVE INDEX,TEETH TO BE PARALLEL WITH AXIS WITHIN 0.0002 IN. PER IN. OF LENGTH,MAXIMUM DIM CIR SPACE WIDTH 0.1003 IN.,MIN DIM CIR SPACE WIDTH 0.0982 IN.,MIN EFF CIR SPACE WIDTH/WITH GAGE/0.0975 IN.,1.1094-1.1012 IN. BETWEEN 0.10497 IN. DIA PINS,AMERICAN BOSCH PART NUMBER GR-5221-A FSCM 01843 IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2920-00-040-0498 is a Unit,ignition Advance, manufactured by Renk America Llc Div Renk America, classified under FSC 2920, Engine Electrical System Components, Nonaircraft. Status: active.
NSN 2920-00-040-0498 has 2 manufacturer part numbers on file: 8666741 (U S Army Tank Automotive Command Amsta-Im-Mm), 525430 (Renk America Llc Div Renk America).
1 possible match (shared part number, not a government interchangeability claim): 5998-01-700-0795. Verify interchangeability with system specifications before substitution.
Key specifications for 525430: General Characteristics Item Description: INTERNAL INVOLUTE SPLINE DATA'NUMBER OF TEETH 20,DIAMETRAL PITCH 16/20,PRESSURE ANGLE/AT GIVEN PITCH DIAMETER/20 DEGREES,CIRCULAR PITCH 0.1963 IN.,BASE CIRCLE DIAMETER 1.1746 IN.,CHORDAL SPACE WIDTH 0.0981 IN./MACHINE TO 0.981-0.1002/PERMISSABLE BACKLASH 0.002 TO 0.006 IN. WHEN MESHING WITH MATING SPLINE,MAXIMUM TOOTH SPACING ERROR REFERENCED TO PITCH LINE 0.003 IN. BETWEEN ADJACENT TEETH,0.0007 IN. CUMULATIVE INDEX,TEETH TO BE PARALLEL WITH AXIS WITHIN 0.0002 IN. PER IN. OF LENGTH,MAXIMUM DIM CIR SPACE WIDTH 0.1003 IN.,MIN DIM CIR SPACE WIDTH 0.0982 IN.,MIN EFF CIR SPACE WIDTH/WITH GAGE/0.0975 IN.,1.1094-1.1012 IN. BETWEEN 0.10497 IN. DIA PINS,AMERICAN BOSCH PART NUMBER GR-5221-A FSCM 01843 IN. 1 specification is documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.