PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

50312Screw,externally Relieved Body

Torkon Fastener Corp · NSN 5305-00-369-2445 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-00-369-2445 — this item is cataloged by the U.S. Government under National Stock Number 5305-00-369-2445. Primary manufacturer part number: 50312.
Features
  • Screw,externally Relieved Body — FSC 5305
  • Thread Quantity Per Inch: 40
  • Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Internal Drive Style: CROSS RECESS TYPE 1
  • Countersink Angle: 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
  • Distance From Largest Bearing Surface of Head to End of First Diameter: 0.137 INCHES NOMINAL IN
  • Thread Direction: RIGHT-HAND
  • Nominal Thread Diameter: 0.112 INCHES IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 303 Overall construction
General Description

The Screw,externally Relieved Body, cataloged under National Stock Number 5305-00-369-2445, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Torkon Fastener Corp. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 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
NSN5305-00-369-2445
Primary Part Number50312
Item NameScrew,externally Relieved Body
FSC / FSG5305 / 53 — No Item Name Available
ManufacturerTorkon Fastener Corp
StatusACTIVE
Thread Quantity Per Inch40
Surface Treatment Document and ClassificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Internal Drive StyleCROSS RECESS TYPE 1
Countersink Angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
Distance From Largest Bearing Surface of Head to End of First Diameter0.137 INCHES NOMINAL IN
Thread DirectionRIGHT-HAND
Nominal Thread Diameter0.112 INCHES IN
First Diameter From Head0.080 INCHES NOMINAL IN
Fastener Length0.305 INCHES NOMINAL IN
Thread Length0.120 INCHES MINIMUM IN
Head StyleFLAT COUNTERSUNK
Externally Relieved Body Diameter Quantity1
Thread Class2A A
Head Diameter0.207 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
Surface TreatmentPASSIVATE OVERALL
MaterialSTEEL COMP 303 OVERALL
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Material Document and ClassificationASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5330-00-171-931012514 INTERCHANGEABLE
Seal,plain Encased
Garwood/feller Inc Garwood Winch Div
3110-00-227-2861 INTERCHANGEABLE
Bearing,roller,needle
4320-00-300-475950-312 INTERCHANGEABLE
Screen,inlet
Crane Pumps & Systems Pft Corp Div Crane Pumps & System Pft Corp.
5995-00-323-128550312 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Alliant Techsystems Operations Llc Div Defense Electronic Systems
3030-00-528-3794 INTERCHANGEABLE
Belt,v
2910-00-541-348656951 INTERCHANGEABLE
Filter Element,fluid
Pti Technologies Inc.
5210-00-711-4931PT99438 INTERCHANGEABLE
Tool Post Holder,dial Indicator
L.s. Starrett Company (the) Div Tool Division
5310-00-938-4937503-12 INTERCHANGEABLE
Washer,flat
Zurn Industries Inc Wilkins Regulator Co Div
6630-00-973-9003 INTERCHANGEABLE
Buffer Solution,standard
5365-01-039-44955031-2 INTERCHANGEABLE
Spacer,sleeve
L3harris Technologies, Inc. Div Space and Airborne Systems
Cross-Reference Index
Part NumberManufacturer
50312 Torkon Fastener Corp (USA)
138099 Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA)
SK138099 Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA)
Related Parts
5330-00-171-9310INTERCHANGEABLE
SEAL,PLAIN ENCASED
12514
3110-00-227-2861INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
4320-00-300-4759INTERCHANGEABLE
SCREEN,INLET
50-312
5995-00-323-1285INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
50312
3030-00-528-3794INTERCHANGEABLE
BELT,V
2910-00-541-3486INTERCHANGEABLE
FILTER ELEMENT,FLUID
56951
5210-00-711-4931INTERCHANGEABLE
TOOL POST HOLDER,DIAL INDICATOR
PT99438
5310-00-938-4937INTERCHANGEABLE
WASHER,FLAT
503-12
6630-00-973-9003INTERCHANGEABLE
BUFFER SOLUTION,STANDARD
5365-01-039-4495INTERCHANGEABLE
SPACER,SLEEVE
5031-2
6680-01-124-8816INTERCHANGEABLE
TRANSMITTER,LIQUID QUANTITY
50312
4520-01-192-3652INTERCHANGEABLE
COLLAR,AIR CONDITIONING-HEATING

Frequently Asked Questions

What is NSN 5305-00-369-2445?

NSN 5305-00-369-2445 is a Screw,externally Relieved Body, manufactured by Torkon Fastener Corp, classified under FSC 5305 (No Item Name Available). Status: active.

What are the part numbers for NSN 5305-00-369-2445?

NSN 5305-00-369-2445 has 3 cross-referenced part numbers: 50312 (Torkon Fastener Corp), 138099 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp), SK138099 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp).

What NSN replaces 5305-00-369-2445?

There are 12 known substitutes for 5305-00-369-2445: 5330-00-171-9310, 3110-00-227-2861, 4320-00-300-4759 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 50312?

Key specifications for 50312: Thread Quantity Per Inch: 40; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Internal Drive Style: CROSS RECESS TYPE 1; Countersink Angle: 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM. 19 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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