Boss Reducer P/N MS21916-6-4R

Specifications

Material document and classification

Overall Fed STD 1ST Material Response 66,Aisi 347 to SAE 30347 or Fed STD 2ND Material Response 66,Aisi 316 to SAE 30316

Media for which designed

First Response Hydraulic Fluid

Nominal thread size

Second End Inches 0.438

Media for which designed

Second Response Air

Surface treatment

Overall Passivate

Reduced passage nominal inside diameter

All Ends Inches 0.187

Maximum operating temp

First Response Fahrenheit 275.0

Operating pressure

Single Response Pounds Per Square Inch (PSI) Maximum 3000.0

Thread class

3A

Nominal overall length

Inches 1.219

Maximum operating temp

Second Response Fahrenheit -65.0

Connection type

All Ends Threaded External Boss

Nominal thread size

First End Inches 0.562

Surface treatment document and classification

Overall MIL Spec Single Treatment Response -IL-S--5002

Thread series designator

All Ends Unified National Joint Fine (Unjf)

Specification/standard data

Government Standard 96906--S21916

Material

Overall Steel Corrosion Resisting

Reducer type

Concentric

From the federal catalog's item characteristics for this NSN. Confirm critical dimensions against your part or drawing before ordering.

Cross-reference part numbers

MS21916-6-4R SAE-AS18280 AS18280 MILF18280 AS21916-6-4S MS21916-6-4S

Also referenced as

312D1373-1

Older, superseded, advisory or drawing numbers the federal catalog associates with this NSN — the ones in an old manual. They find the item; confirm the current part number when you order.

Shown for identification only. SECO can quote against any of these numbers.

Logistics data

Source of supply	SMS DLA Land and Maritime, Columbus, Ohio
Acquisition advice code	Z Insurance/numeric stockage objective — held by the government as insurance stock for contingencies, not for routine issue. SECO has 3 on the shelf
Unit of issue	PG package
Demilitarization code	A Demilitarization not required — non-munitions-list item
Controlled inventory code	U Unclassified
Hazardous material indicator	N No hazardous material

Source: public FLIS/PUB LOG cataloging data.

Why buy from SECO

These quantities sit on our own shelves — we are a stocking supplier, not a broker sourcing after you order. Condition-coded stock, formal quotes with NSN/PN on the paperwork, POs and GPC welcome, fast U.S. shipping.

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FAQ

What is NSN 4730-00-720-3985?
NSN 4730-00-720-3985 (4730007203985) — Boss Reducer: SECO Parts has 3 in stock in Augusta, GA, on our own shelf. It is the NATO Stock Number for boss reducer in federal supply class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings).

Is NSN 4730-00-720-3985 available?
SECO Parts has 3 in stock in Augusta, GA — order or request a quote below.

How much does NSN 4730-00-720-3985 cost?
SECO quotes NSN 4730-00-720-3985 on request, usually the same business day.

What part numbers cross-reference to NSN 4730-00-720-3985?
Part numbers that cross-reference this NSN include MS21916-6-4R, SAE-AS18280, AS18280, MILF18280, AS21916-6-4S, MS21916-6-4S. It is also referenced by older, superseded or advisory numbers: 312D1373-1. SECO can quote against any of them.