PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

591-611Stem,plug,blower

Steward Machine Co Inc · NSN 4820-00-950-1898 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-950-1898 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-950-1898. Primary manufacturer part number: 591-611.
Features
  • Stem,plug,blower — FSC 4820
  • General Characteristics Item Description: CRES; 10.312 IN. O/A LG IN
  • 11 verified cross-references
  • Primary manufacturer: Steward Machine Co Inc
Applications
  • Flow control in piping systems
  • Water treatment infrastructure
  • Industrial process control
General Description

The Stem,plug,blower, cataloged under National Stock Number 4820-00-950-1898, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Steward Machine Co Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 11 commercial cross-references from 3 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
NSN4820-00-950-1898
Primary Part Number591-611
Item NameStem,plug,blower
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerSteward Machine Co Inc
StatusACTIVE
General Characteristics Item DescriptionCRES; 10.312 IN. O/A LG IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5305-00-010-0138100138 INTERCHANGEABLE
Screw,cap,hexagon Head
Rolls-Royce Solutions America Inc
3110-00-243-4878 INTERCHANGEABLE
Cam Follower,needle Bearing
5330-00-286-8149 INTERCHANGEABLE
Seal,plain Encased
5340-00-389-9271 INTERCHANGEABLE
Seat,helical Compression Spring
3020-00-454-7984 INTERCHANGEABLE
Gear,helical
9540-00-580-6228 INTERCHANGEABLE
Beam,structural
5110-00-796-684760656 INTERCHANGEABLE
Punch,nibbling Tool
Adel Tool Co
4730-00-944-4972 INTERCHANGEABLE
Elbow,pipe
3120-00-950-1874590-356 INTERCHANGEABLE
Bushing,sleeve
Steward Machine Co Inc
2825-00-950-1881 INTERCHANGEABLE
Collar,blower
Cross-Reference Index
Part NumberManufacturer
60-773PC611 Hardie-Tynes Co., Inc. (USA)
60-773 Hardie-Tynes Co., Inc. (USA)
60-620 Hardie-Tynes Co., Inc. (USA)
591-611 Hardie-Tynes Co., Inc. (USA)
591-611 PRIMARY Steward Machine Co Inc (USA)
60-591PC611 Classic Mfg (USA)
60-591 Hardie-Tynes Co., Inc. (USA)
60-656PC611 Hardie-Tynes Co., Inc. (USA)
60-656 Hardie-Tynes Co., Inc. (USA)
60-591PC611 Hardie-Tynes Co., Inc. (USA)
60-620PC611 Hardie-Tynes Co., Inc. (USA)
Related Parts
5305-00-010-0138INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
100138
3110-00-243-4878INTERCHANGEABLE
CAM FOLLOWER,NEEDLE BEARING
5330-00-286-8149INTERCHANGEABLE
SEAL,PLAIN ENCASED
5340-00-389-9271INTERCHANGEABLE
SEAT,HELICAL COMPRESSION SPRING
3020-00-454-7984INTERCHANGEABLE
GEAR,HELICAL
9540-00-580-6228INTERCHANGEABLE
BEAM,STRUCTURAL
5110-00-796-6847INTERCHANGEABLE
PUNCH,NIBBLING TOOL
60656
4730-00-944-4972INTERCHANGEABLE
ELBOW,PIPE
3120-00-950-1874INTERCHANGEABLE
BUSHING,SLEEVE
590-356
2825-00-950-1881INTERCHANGEABLE
COLLAR,BLOWER
3110-00-950-1887INTERCHANGEABLE
BEARING,BLOWER
2825-00-950-1888INTERCHANGEABLE
SLEEVE,BLOWER
591-578AP

Frequently Asked Questions

What is NSN 4820-00-950-1898?

NSN 4820-00-950-1898 is a Stem,plug,blower, manufactured by Steward Machine Co Inc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-950-1898?

NSN 4820-00-950-1898 has 11 cross-referenced part numbers: 60-773PC611 (Hardie-Tynes Co., Inc.), 60-773 (Hardie-Tynes Co., Inc.), 60-620 (Hardie-Tynes Co., Inc.), 591-611 (Hardie-Tynes Co., Inc.), 591-611 (Steward Machine Co Inc) and 6 more.

What NSN replaces 4820-00-950-1898?

There are 12 known substitutes for 4820-00-950-1898: 5305-00-010-0138, 3110-00-243-4878, 5330-00-286-8149 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 591-611?

Key specifications for 591-611: General Characteristics Item Description: CRES; 10.312 IN. O/A LG IN. 1 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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