PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21041Bolt,shoulder

Helicopter Parts Service Inc · NSN 5306-00-965-6500 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-965-6500 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-965-6500. Primary manufacturer part number: 21041.
Features
  • Bolt,shoulder — FSC 5306
  • Head Height: 0.220 INCHES NOMINAL IN
  • Thread Class: 3A A
  • Width Between Flats: 0.562 INCHES NOMINAL IN
  • Shoulder Length: 0.360 INCHES NOMINAL FIRST SHOULDER IN
  • Material: STEEL COMP 4130 OVERALL
  • Thread Series Designator: UNF
  • Shoulder Shape: ROUND FIRST SHOULDER
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 4130 Overall construction
General Description

The Bolt,shoulder, cataloged under National Stock Number 5306-00-965-6500, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Helicopter Parts Service Inc. Government technical data includes 16 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5306-00-965-6500
Primary Part Number21041
Item NameBolt,shoulder
FSC / FSG5306 / 53 — No Item Name Available
ManufacturerHelicopter Parts Service Inc
StatusACTIVE
Head Height0.220 INCHES NOMINAL IN
Thread Class3A A
Width Between Flats0.562 INCHES NOMINAL IN
Shoulder Length0.360 INCHES NOMINAL FIRST SHOULDER IN
MaterialSTEEL COMP 4130 OVERALL
Thread Series DesignatorUNF
Shoulder ShapeROUND FIRST SHOULDER
Nominal Thread Diameter0.375 INCHES IN
Hardness Rating34.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
Thread Length0.596 INCHES MINIMUM IN
Thread Quantity Per Inch24
Head StyleHEXAGON
Surface TreatmentCADMIUM OVERALL
Thread DirectionRIGHT-HAND
Fastener Length1.060 INCHES NOMINAL IN
Shoulder Diameter0.4020 INCHES MINIMUM AND 0.4040 INCHES MAXIMUM FIRST SHOULDER IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
Power Supply Subassembly
5315-00-188-0199MS24692-319 INTERCHANGEABLE
Pin,tapered,plain
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5120-00-240-5330 INTERCHANGEABLE
Wrench,adjustable
5950-00-400-910421041 INTERCHANGEABLE
Reactor
Magnetika Inc
5905-00-502-2372 INTERCHANGEABLE
Resistor,variable,wire Wound,non
5930-00-810-983421041 INTERCHANGEABLE
Switch,pressure
Hydra-Electric Company Dba Hydra-Electric Co
5945-00-944-475621041 INTERCHANGEABLE
Relay,electromagnetic
General Automatic Products Corp
5999-01-038-5630921041 INTERCHANGEABLE
Magnet,permanent
Parker-Hannifin Corporation Dba Hydraulic Filter Division Div Hydraulic & Fuel Filter Division
3950-01-067-169321041 INTERCHANGEABLE
Race,brake and Clut
Paccar Winch Inc Dba Paccar Winch Division
5841-01-101-099721041 INTERCHANGEABLE
Panel,intermediate Rear
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
Cross-Reference Index
Part NumberManufacturer
21041 Helicopter Parts Service Inc (USA)
21041 Hiller Aircraft Corporation (USA)
Related Parts
6130-01-351-9036SUCCESSOR
POWER SUPPLY SUBASSEMBLY
5315-00-188-0199INTERCHANGEABLE
PIN,TAPERED,PLAIN
MS24692-319
5120-00-240-5330INTERCHANGEABLE
WRENCH,ADJUSTABLE
5950-00-400-9104INTERCHANGEABLE
REACTOR
21041
5905-00-502-2372INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
5930-00-810-9834INTERCHANGEABLE
SWITCH,PRESSURE
21041
5945-00-944-4756INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
21041
5999-01-038-5630INTERCHANGEABLE
MAGNET,PERMANENT
921041
3950-01-067-1693INTERCHANGEABLE
RACE,BRAKE AND CLUT
21041
5841-01-101-0997INTERCHANGEABLE
PANEL,INTERMEDIATE REAR
21041
4320-01-244-4960INTERCHANGEABLE
MODULE ASSY,PUMP
21041
4820-01-397-5402INTERCHANGEABLE
VALVE,BALL

Frequently Asked Questions

What is NSN 5306-00-965-6500?

NSN 5306-00-965-6500 is a Bolt,shoulder, manufactured by Helicopter Parts Service Inc, classified under FSC 5306 (No Item Name Available). Status: active.

What are the part numbers for NSN 5306-00-965-6500?

NSN 5306-00-965-6500 has 2 cross-referenced part numbers: 21041 (Helicopter Parts Service Inc), 21041 (Hiller Aircraft Corporation).

What NSN replaces 5306-00-965-6500?

There are 12 known substitutes for 5306-00-965-6500: 6130-01-351-9036, 5315-00-188-0199, 5120-00-240-5330 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21041?

Key specifications for 21041: Head Height: 0.220 INCHES NOMINAL IN; Thread Class: 3A A; Width Between Flats: 0.562 INCHES NOMINAL IN; Shoulder Length: 0.360 INCHES NOMINAL FIRST SHOULDER IN. 16 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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