PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1688-6Gage,plug,thread

Stanley Engineered Fastening Llc · NSN 5220-00-566-4043 · FSC 5220 · No Item Name Available
Verified by PartsTable
NSN 5220-00-566-4043 — this item is cataloged by the U.S. Government under National Stock Number 5220-00-566-4043. Primary manufacturer part number: 1688-6.
Features
  • Gage,plug,thread — FSC 5220
  • Screw Thread Series Designator: UNIFIED NATIONAL COARSE (UNC)
  • Thread Direction: RIGHT-HAND
  • Nominal Thread Diameter: 0.3750 INCHES IN
  • Thread Design Pitch Diameter: 0.4156 INCHES MINIMUM AND 0.4189 INCHES MAXIMUM IN
  • Tapered Threads: NOT INCLUDED
  • Thread Stamped Pitch Diameter: 0.4156 INCHES MINIMUM AND 0.4189 INCHES MAXIMUM IN
  • Thread Major Diameter Truncation Feature: NOT INCLUDED
Applications
  • Quality assurance and inspection
  • Precision measurement and calibration
  • Laboratory and test equipment
General Description

The Gage,plug,thread, cataloged under National Stock Number 5220-00-566-4043, is classified within Federal Supply Class 5220 (No Item Name Available) of the Measuring Tools group. The primary manufacturer of record is Stanley Engineered Fastening Llc. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5220-00-566-4043
Primary Part Number1688-6
Item NameGage,plug,thread
FSC / FSG5220 / 52 — No Item Name Available
ManufacturerStanley Engineered Fastening Llc
StatusACTIVE
Screw Thread Series DesignatorUNIFIED NATIONAL COARSE (UNC)
Thread DirectionRIGHT-HAND
Nominal Thread Diameter0.3750 INCHES IN
Thread Design Pitch Diameter0.4156 INCHES MINIMUM AND 0.4189 INCHES MAXIMUM IN
Tapered ThreadsNOT INCLUDED
Thread Stamped Pitch Diameter0.4156 INCHES MINIMUM AND 0.4189 INCHES MAXIMUM IN
Thread Major Diameter Truncation FeatureNOT INCLUDED
Design TypeDOUBLE END
Pitch Diameter Tolerance-0.00010 TO 0.00010 INCHES AND -0.00010 TO 0.00000 INCHES IN
Features ProvidedCOMBINATION GO NOT GO GAGE
Screw Thread Quantity Per Inch16.0
Thread TypeSINGLE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5310-00-905-545416-886 INTERCHANGEABLE
Washer,lock
Eaton Corp Electrical Construction Equipment Opns
5305-01-045-529916886 INTERCHANGEABLE
Setscrew
Clayton Manufacturing Company
Cross-Reference Index
Part NumberManufacturer
1688-6 PRIMARY Stanley Engineered Fastening Llc (USA)
Related Parts
5310-00-905-5454INTERCHANGEABLE
WASHER,LOCK
16-886
5305-01-045-5299INTERCHANGEABLE
SETSCREW
16886

Frequently Asked Questions

What is NSN 5220-00-566-4043?

NSN 5220-00-566-4043 is a Gage,plug,thread, manufactured by Stanley Engineered Fastening Llc, classified under FSC 5220 (No Item Name Available). Status: active.

What are the part numbers for NSN 5220-00-566-4043?

NSN 5220-00-566-4043 has 1 cross-referenced part number: 1688-6 (Stanley Engineered Fastening Llc).

What NSN replaces 5220-00-566-4043?

There are 2 known substitutes for 5220-00-566-4043: 5310-00-905-5454, 5305-01-045-5299. Verify interchangeability with system specifications before substitution.

What are the specifications of 1688-6?

Key specifications for 1688-6: Screw Thread Series Designator: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND; Nominal Thread Diameter: 0.3750 INCHES IN; Thread Design Pitch Diameter: 0.4156 INCHES MINIMUM AND 0.4189 INCHES MAXIMUM IN. 12 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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