PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A4321Screw,machine

Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. · NSN 5305-00-638-8666 · FSC 5305 · No Item Name Available
Verified by PartsTable
NSN 5305-00-638-8666 — this item is cataloged by the U.S. Government under National Stock Number 5305-00-638-8666. Primary manufacturer part number: A4321.
Features
  • Screw,machine — FSC 5305
  • Head Style: ROUND
  • Thread Length: 0.344 INCHES MAXIMUM IN
  • Thread Direction: RIGHT-HAND
  • Nominal Thread Diameter: 0.164 INCHES IN
  • Fastener Length: 0.344 INCHES NOMINAL IN
  • Screw Surface Treatment: CADMIUM
  • Head Height: 0.107 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Screw,machine, cataloged under National Stock Number 5305-00-638-8666, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5305-00-638-8666
Primary Part NumberA4321
Item NameScrew,machine
FSC / FSG5305 / 53 — No Item Name Available
ManufacturerPratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
StatusCANCELLED
Head StyleROUND
Thread Length0.344 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND
Nominal Thread Diameter0.164 INCHES IN
Fastener Length0.344 INCHES NOMINAL IN
Screw Surface TreatmentCADMIUM
Head Height0.107 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
Thread Class2A A
Head Diameter0.312 INCHES NOMINAL IN
Internal Drive StyleCROSS RECESS TYPE 1
Screw MaterialSTEEL
Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Thread Quantity Per Inch32
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
5940-00-215-5962 INTERCHANGEABLE
Terminal Box
5133-00-253-54584321-0046 INTERCHANGEABLE
Drill,twist
New York Twist Drill Inc
5330-00-492-8827709014 INTERCHANGEABLE
Packing Wiper
Jeffrey Co the
6685-00-530-0339607112020 INTERCHANGEABLE
Pyrometer,indicating
Alnor Instrument Company
5905-00-549-972138773 INTERCHANGEABLE
Resistor,variable,wire Wound,non
Ohmite Holding, L.l.c. Dba Ohmite Manufacturing
5133-00-841-870331004 INTERCHANGEABLE
Drill,twist
Precision Twist Drill Co
5305-00-952-11934321 INTERCHANGEABLE
Screw,shoulder
Roller Bearing Co of America, Inc Div Pic Design
4730-01-086-9953 INTERCHANGEABLE
Adapter,straight,tube to Boss
5910-01-118-0305P09ZNR601-805K INTERCHANGEABLE
Capacitor,fixed,metallized,paper
Kyocera Avx Components Corporation
1730-01-126-17524312 INTERCHANGEABLE
Winch,dragchute Stand
Thern Inc
Cross-Reference Index
Part NumberManufacturer
4321 Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN)
A4321 PRIMARY Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN)
Related Parts
5940-00-215-5962INTERCHANGEABLE
TERMINAL BOX
5133-00-253-5458INTERCHANGEABLE
DRILL,TWIST
4321-0046
5330-00-492-8827INTERCHANGEABLE
PACKING WIPER
709014
6685-00-530-0339INTERCHANGEABLE
PYROMETER,INDICATING
607112020
5905-00-549-9721INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
38773
5133-00-841-8703INTERCHANGEABLE
DRILL,TWIST
31004
5305-00-952-1193INTERCHANGEABLE
SCREW,SHOULDER
4321
4730-01-086-9953INTERCHANGEABLE
ADAPTER,STRAIGHT,TUBE TO BOSS
5910-01-118-0305INTERCHANGEABLE
CAPACITOR,FIXED,METALLIZED,PAPER
P09ZNR601-805K
1730-01-126-1752INTERCHANGEABLE
WINCH,DRAGCHUTE STAND
4312
6515-01-168-0005INTERCHANGEABLE
BAG,OSTOMY
4321
5305-01-200-9706INTERCHANGEABLE
SCREW,SHOULDER
4321

Frequently Asked Questions

What is NSN 5305-00-638-8666?

NSN 5305-00-638-8666 is a Screw,machine, manufactured by Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp., classified under FSC 5305 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5305-00-638-8666?

NSN 5305-00-638-8666 has 2 cross-referenced part numbers: 4321 (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.), A4321 (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.).

What NSN replaces 5305-00-638-8666?

There are 12 known substitutes for 5305-00-638-8666: 5940-00-215-5962, 5133-00-253-5458, 5330-00-492-8827 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A4321?

Key specifications for A4321: Head Style: ROUND; Thread Length: 0.344 INCHES MAXIMUM IN; Thread Direction: RIGHT-HAND; Nominal Thread Diameter: 0.164 INCHES IN. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5305-00-638-8666 still in active supply?

NSN 5305-00-638-8666 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com