PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1891Washer,flat

R.w. Fernstrum & Company · NSN 5310-01-491-8812 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-491-8812 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-491-8812. Primary manufacturer part number: 1891.
Features
  • Washer,flat — FSC 5310
  • Supplementary Features: CONTROLLING AGENCY NOMENCLATURE NOZZLE WASHER
  • 2 verified cross-references
  • Primary manufacturer: R.w. Fernstrum & Company
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Washer,flat, cataloged under National Stock Number 5310-01-491-8812, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is R.w. Fernstrum & Company. Government technical data includes 1 verified specification, 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-01-491-8812
Primary Part Number1891
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerR.w. Fernstrum & Company
StatusACTIVE
Supplementary FeaturesCONTROLLING AGENCY NOMENCLATURE NOZZLE WASHER
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6685-00-001-4183 INTERCHANGEABLE
Control,positioner
5935-00-201-23381891 INTERCHANGEABLE
Jack,tip
Entron Industries Limited Partnership Dba Entron Industries Property Div
5999-00-264-7968591B1-1 INTERCHANGEABLE
Cap,electrical
Cardwell Condenser Corp Lapointe-Admiral Div
4820-00-367-4867189-1 INTERCHANGEABLE
Cock,drain
Dresser Industries Inc Leroi Div
5360-00-455-71471891 INTERCHANGEABLE
Spring,helical,compression
Thompson Emery Machine & Supply Co
5331-00-515-55584036D28 INTERCHANGEABLE
O-Ring
Curtiss-Wright Controls, Inc. Div Actuation Division
5950-00-648-0777 INTERCHANGEABLE
Transformer,radio Frequency
6240-00-770-33721891 INTERCHANGEABLE
Lamp,incandescent
Gte Products Corp Sylvania Miniature Lighting Div
5935-00-814-5835GC810A8B INTERCHANGEABLE
Connector,plug,electrical
Northrop Grumman Systems Corporation
4820-00-969-27001891 INTERCHANGEABLE
Seat,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Cross-Reference Index
Part NumberManufacturer
1891 Kort Propulsion Co Ltd (GBR)
1891 PRIMARY R.w. Fernstrum & Company (USA)
Related Parts
6685-00-001-4183INTERCHANGEABLE
CONTROL,POSITIONER
5935-00-201-2338INTERCHANGEABLE
JACK,TIP
1891
5999-00-264-7968INTERCHANGEABLE
CAP,ELECTRICAL
591B1-1
4820-00-367-4867INTERCHANGEABLE
COCK,DRAIN
189-1
5360-00-455-7147INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
1891
5331-00-515-5558INTERCHANGEABLE
O-RING
4036D28
5950-00-648-0777INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
6240-00-770-3372INTERCHANGEABLE
LAMP,INCANDESCENT
1891
5935-00-814-5835INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
GC810A8B
4820-00-969-2700INTERCHANGEABLE
SEAT,VALVE
1891
5950-01-216-4666INTERCHANGEABLE
TRANSFORMER,POWER
14059
6750-01-379-7328INTERCHANGEABLE
PAPER,PHOTOGRAPHIC

Frequently Asked Questions

What is NSN 5310-01-491-8812?

NSN 5310-01-491-8812 is a Washer,flat, manufactured by R.w. Fernstrum & Company, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-491-8812?

NSN 5310-01-491-8812 has 2 cross-referenced part numbers: 1891 (Kort Propulsion Co Ltd), 1891 (R.w. Fernstrum & Company).

What NSN replaces 5310-01-491-8812?

There are 12 known substitutes for 5310-01-491-8812: 6685-00-001-4183, 5935-00-201-2338, 5999-00-264-7968 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1891?

Key specifications for 1891: End Item Identification: LANDING CRAFT UTILITY MK 10; Supplementary Features: CONTROLLING AGENCY NOMENCLATURE NOZZLE WASHER. 2 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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