The Crosshead Assembly,pump, cataloged under National Stock Number 4320-01-181-3720, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Eastern Industrial Products, Inc.. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-181-3720 |
| Primary Part Number | 63E121PC2 |
| Item Name | Crosshead Assembly,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Eastern Industrial Products, Inc. |
| Status | ACTIVE |
| General Characteristics Item Description | COLD-ROLLED STEEL,C1020; 3-3/4 IN. LG; 1-5/32 IN. LG FORK ON ONE END 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 |
|---|---|
| 63E121PC2 PRIMARY | Eastern Industrial Products, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 63E121 | D/9 Drawing number reference only Eastern Industrial Products, Inc. |
| 63-E-33 PIECE 2 | C/1 Advisory reference — outside the item-of-supply concept Eastern Industrial Products, Inc. |
| 71E106 PIECE 2 | C/1 Advisory reference — outside the item-of-supply concept Eastern Industrial Products, Inc. |
NSN 4320-01-181-3720 is a Crosshead Assembly,pump, manufactured by Eastern Industrial Products, Inc., classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-181-3720 has 1 manufacturer part number on file: 63E121PC2 (Eastern Industrial Products, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4320-01-181-3721, 4320-01-195-6110. Verify interchangeability with system specifications before substitution.
Key specifications for 63E121PC2: General Characteristics Item Description: COLD-ROLLED STEEL,C1020; 3-3/4 IN. LG; 1-5/32 IN. LG FORK ON ONE END IN; End Item Identification: SIMPLEX CHEMICAL PROPORTIONING PUMP,MODEL SN-10-58,WALTER EAGAN CO. 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.