The Chain,leaf, cataloged under National Stock Number 3020-01-439-0532, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Rexnord Holdings Inc. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-439-0532 |
| Primary Part Number | BL-646 185 PITCHES |
| Item Name | Chain,leaf |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Rexnord Holdings Inc |
| Status | ACTIVE |
| Link Plate Nominal Thickness | 0.1250 INCHES IN |
| Link Style | 4 X 6 |
| Link Nominal Width | 1.2500 INCHES IN |
| Link Pin Nominal Diameter | 0.3125 INCHES IN |
| Pin Overall Length | 1.4410 INCHES NOMINAL IN |
| Effective Length | 138.7500 INCHES NOMINAL IN |
| Nominal Pitch Distance | 0.7500 INCHES IN |
| Pin Fastening Method | RIVETED |
| Minimum Tensile Strength | 22000 POUNDS PER SQUARE INCH LBS |
| Link Row Quantity | 1 |
| Material | STEEL |
| Link Plate Width | 0.7000 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| BL-646 185 PITCHES | Altra Industrial Motion Corp. (USA) |
| BL-646 185 PITCHES PRIMARY | Rexnord Holdings Inc (USA) |
| BL-646 185 PITCHES PRIMARY | Rexnord Industries, Llc Div Couplings Division (USA) |
| Reference | Meaning |
|---|---|
| 8127010 | 5/9 Secondary reference Trak International |
| BL-646 185 PITCHES | 5/9 Secondary reference Emerson Power Transmission Corporation Div Ept |
| BL-646 185 PITCHES | 5/9 Secondary reference Rexnord Industries Inc. Div Roller Chain Operation |
| 8127010 | 3/9 Design control — primary reference Jlg Industries, Inc. |
NSN 3020-01-439-0532 is a Chain,leaf, manufactured by Rexnord Holdings Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-439-0532 has 3 manufacturer part numbers on file: BL-646 185 PITCHES (Altra Industrial Motion Corp.), BL-646 185 PITCHES (Rexnord Holdings Inc), BL-646 185 PITCHES (Rexnord Industries, Llc Div Couplings Division).
Key specifications for BL-646 185 PITCHES: Link Plate Nominal Thickness: 0.1250 INCHES IN; Link Style: 4 X 6; Link Nominal Width: 1.2500 INCHES IN; Link Pin Nominal Diameter: 0.3125 INCHES IN. 12 specifications are 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.