PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FN-3/8Adapter,torque Wrench

Ryeson Corporation Div Sturtevant Richmont · NSN 5120-00-791-0031 · FSC 5120 · No Item Name Available
Verified by PartsTable
NSN 5120-00-791-0031 — this item is cataloged by the U.S. Government under National Stock Number 5120-00-791-0031. Primary manufacturer part number: FN-3/8.
Features
  • Adapter,torque Wrench — FSC 5120
  • Wrenching End Outside Diameter: 0.812 INCHES NOMINAL IN
  • Material: STEEL OVERALL
  • Style Designator: BOX, OPEN END
  • Wrenching Surface Shape: 12 POINT SINGLE END INTERNAL
  • Wrenching Surface Size: 0.375 INCHES NOMINAL SINGLE END IN
  • Wrenching End Head Thickness: 0.312 INCHES NOMINAL IN
  • Drive End Shape: DOVETAIL SINGLE END INTERNAL
Applications
  • Applications requiring Steel Overall construction
General Description

The Adapter,torque Wrench, cataloged under National Stock Number 5120-00-791-0031, is classified within Federal Supply Class 5120 (No Item Name Available) of the Hand Tools group. The primary manufacturer of record is Ryeson Corporation Div Sturtevant Richmont. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5120-00-791-0031
Primary Part NumberFN-3/8
Item NameAdapter,torque Wrench
FSC / FSG5120 / 51 — No Item Name Available
ManufacturerRyeson Corporation Div Sturtevant Richmont
StatusACTIVE
Wrenching End Outside Diameter0.812 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Style DesignatorBOX, OPEN END
Wrenching Surface Shape12 POINT SINGLE END INTERNAL
Wrenching Surface Size0.375 INCHES NOMINAL SINGLE END IN
Wrenching End Head Thickness0.312 INCHES NOMINAL IN
Drive End ShapeDOVETAIL SINGLE END INTERNAL
Distance From Shoulder End to Wrench Opening Center1.438 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5310-01-134-555815203 INTERCHANGEABLE
Nut,plain,single Ball Seat,hexag
Northwestern Tools, Inc.
Cross-Reference Index
Part NumberManufacturer
819027-4 Ryeson Corporation Div Sturtevant Richmont (USA)
819027 Ryeson Corporation Div Sturtevant Richmont (USA)
SFN-3/8 Ryeson Corporation Div Sturtevant Richmont (USA)
FN-3/8 PRIMARY Ryeson Corporation Div Sturtevant Richmont (USA)
Related Parts
5310-01-134-5558INTERCHANGEABLE
NUT,PLAIN,SINGLE BALL SEAT,HEXAG
15203

Frequently Asked Questions

What is NSN 5120-00-791-0031?

NSN 5120-00-791-0031 is a Adapter,torque Wrench, manufactured by Ryeson Corporation Div Sturtevant Richmont, classified under FSC 5120 (No Item Name Available). Status: active.

What are the part numbers for NSN 5120-00-791-0031?

NSN 5120-00-791-0031 has 4 cross-referenced part numbers: 819027-4 (Ryeson Corporation Div Sturtevant Richmont), 819027 (Ryeson Corporation Div Sturtevant Richmont), SFN-3/8 (Ryeson Corporation Div Sturtevant Richmont), FN-3/8 (Ryeson Corporation Div Sturtevant Richmont).

What NSN replaces 5120-00-791-0031?

There is 1 known substitute for 5120-00-791-0031: 5310-01-134-5558. Verify interchangeability with system specifications before substitution.

What are the specifications of FN-3/8?

Key specifications for FN-3/8: Wrenching End Outside Diameter: 0.812 INCHES NOMINAL IN; Material: STEEL OVERALL; Style Designator: BOX, OPEN END; Overall Length: 1.562 INCHES NOMINAL IN. 10 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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