PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

135999Howitzer,medium,towed

Cadillac Gage Textron Inc. · NSN 1025-01-445-0991 · FSC 1025 · No Item Name Available
Verified by PartsTable
NSN 1025-01-445-0991 — this item is cataloged by the U.S. Government under National Stock Number 1025-01-445-0991. Primary manufacturer part number: 135999.
Features
  • Howitzer,medium,towed — FSC 1025
  • Size Designation: 155 MILLIMETER MM
  • Model Number: XM777
  • 2 verified cross-references
  • Primary manufacturer: Cadillac Gage Textron Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Howitzer,medium,towed, cataloged under National Stock Number 1025-01-445-0991, is classified within Federal Supply Class 1025 (No Item Name Available) of the Weapons group. The primary manufacturer of record is Cadillac Gage Textron Inc.. Government technical data includes 2 verified specifications, 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. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1025-01-445-0991
Primary Part Number135999
Item NameHowitzer,medium,towed
FSC / FSG1025 / 10 — No Item Name Available
ManufacturerCadillac Gage Textron Inc.
StatusACTIVE
Size Designation155 MILLIMETER MM
Model NumberXM777
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5360-00-797-4473135999 INTERCHANGEABLE
Spring,helical,compression
Honeywell International, Inc Div Aerospace-Tucson
5330-00-837-9550575420M1 INTERCHANGEABLE
Seal,plain Encased
Skf Usa Inc. Dba Skf Aerospace Sealing Solutions
5826-01-194-5787135999 INTERCHANGEABLE
Mounting Plate Asse
Astronautics Corporation of America
Cross-Reference Index
Part NumberManufacturer
135999 PRIMARY Cadillac Gage Textron Inc. (USA)
AMP-02-00-00000 Bae Systems Gcs International Ltd (GBR)
Related Parts
5360-00-797-4473INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
135999
5330-00-837-9550INTERCHANGEABLE
SEAL,PLAIN ENCASED
575420M1
5826-01-194-5787INTERCHANGEABLE
MOUNTING PLATE ASSE
135999

Frequently Asked Questions

What is NSN 1025-01-445-0991?

NSN 1025-01-445-0991 is a Howitzer,medium,towed, manufactured by Cadillac Gage Textron Inc., classified under FSC 1025 (No Item Name Available). Status: active.

What are the part numbers for NSN 1025-01-445-0991?

NSN 1025-01-445-0991 has 2 cross-referenced part numbers: 135999 (Cadillac Gage Textron Inc.), AMP-02-00-00000 (Bae Systems Gcs International Ltd).

What NSN replaces 1025-01-445-0991?

There are 3 known substitutes for 1025-01-445-0991: 5360-00-797-4473, 5330-00-837-9550, 5826-01-194-5787. Verify interchangeability with system specifications before substitution.

What are the specifications of 135999?

Key specifications for 135999: Size Designation: 155 MILLIMETER MM; Model Number: XM777; Special Features: WEIGHT 8,675 LB;TOWED LENGTH 374.3 IN;TOWED HEIGHT 88.8 IN;TOWED WIDTH 109 IN;GROUND CLEARANCE 27 IN;HYDRAULICALLY OPERATED, TWIN CALIPER DISC BRAKE SYSTEM, ACTIVATED BY COMPRESSED AIR FROM THE TOWING VEHICLE VIA AN AIR/OIL ACTUATOR;THE LIGHTWEIGHT HOWITZER CAPABLE OF FIRING 5-8 ROUNDS PER MINUTE WILL EMPLACE, DISPLACE AND BOLD SHIFT IN HALF THE TIME EXPERIENCED WITH THE M198 HOWITZER. LBS. 3 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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