PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12421Guide,plunger

Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems · NSN 2910-00-991-8279 · FSC 2910 · No Item Name Available
Verified by PartsTable
NSN 2910-00-991-8279 — this item is cataloged by the U.S. Government under National Stock Number 2910-00-991-8279. Primary manufacturer part number: 12421.
Features
  • Guide,plunger — FSC 2910
  • General Characteristics Item Description: 0.827 IN. OD ON ONE END,0.750 IN. OD ON OTHER END,0.315 IN. LG,0.407 IN. ID,ONE GROOVE,0.070 IN. W OF GROOVE IN
  • 2 verified cross-references
  • Primary manufacturer: Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Guide,plunger, cataloged under National Stock Number 2910-00-991-8279, is classified within Federal Supply Class 2910 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems. 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. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2910-00-991-8279
Primary Part Number12421
Item NameGuide,plunger
FSC / FSG2910 / 29 — No Item Name Available
ManufacturerStanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
StatusACTIVE
General Characteristics Item Description0.827 IN. OD ON ONE END,0.750 IN. OD ON OTHER END,0.315 IN. LG,0.407 IN. ID,ONE GROOVE,0.070 IN. W OF GROOVE IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5330-00-179-2109 INTERCHANGEABLE
Seal,plain Encased
5120-00-243-2946 INTERCHANGEABLE
Hammer,hand
4720-00-922-5132 INTERCHANGEABLE
Hose,nonmetallic
5310-01-157-328212421 INTERCHANGEABLE
Nut,plain,hexagon
Westerbeke Corporation
5340-01-342-93411-242-1 INTERCHANGEABLE
Cover,access
Horizon Aerospace Llc Dba Transicoil
2920-01-501-6279 INTERCHANGEABLE
Starter,engine,electrical
Cross-Reference Index
Part NumberManufacturer
12421 PRIMARY Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems (USA)
12421 Lockwood Corp (USA)
Related Parts
5330-00-179-2109INTERCHANGEABLE
SEAL,PLAIN ENCASED
5120-00-243-2946INTERCHANGEABLE
HAMMER,HAND
4720-00-922-5132INTERCHANGEABLE
HOSE,NONMETALLIC
5310-01-157-3282INTERCHANGEABLE
NUT,PLAIN,HEXAGON
12421
5340-01-342-9341INTERCHANGEABLE
COVER,ACCESS
1-242-1
2920-01-501-6279INTERCHANGEABLE
STARTER,ENGINE,ELECTRICAL

Frequently Asked Questions

What is NSN 2910-00-991-8279?

NSN 2910-00-991-8279 is a Guide,plunger, manufactured by Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems, classified under FSC 2910 (No Item Name Available). Status: active.

What are the part numbers for NSN 2910-00-991-8279?

NSN 2910-00-991-8279 has 2 cross-referenced part numbers: 12421 (Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems), 12421 (Lockwood Corp).

What NSN replaces 2910-00-991-8279?

There are 6 known substitutes for 2910-00-991-8279: 5330-00-179-2109, 5120-00-243-2946, 4720-00-922-5132 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12421?

Key specifications for 12421: General Characteristics Item Description: 0.827 IN. OD ON ONE END,0.750 IN. OD ON OTHER END,0.315 IN. LG,0.407 IN. ID,ONE GROOVE,0.070 IN. W OF GROOVE 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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