Tube Coupling Nut P/N MS21921-4J

Specifications

Thread series

Unified National Joint Fine (Unjf)

Thread quantity per inch

20

Nominal thread size

Inches 0.438

Length to shoulder

0.547 in (nominal)

Smallest inside diameter

0.300 in (nominal)

Fabrication method

Machined

Nut height

0.720 in (nominal)

Width across flats

0.562 in (nominal)

Thread class

3B

Thread direction

Right-Hand

Seat angle

45.00 ° (nominal)

Material document and classification

Overall Fed Spec Single Material Response QQ-S-763,Class 304

Surface treatment

Overall Passivate

Surface treatment document and classification

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

Specification/standard data

Government Standard 96906--S21921

Material

Overall Steel Comp 304

Nominal tube outside diameter

Inches 0.250

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

Cross-reference part numbers

MS21921-4J SAE-AS18280 VSF1212-4CC 202-21600C4 AS21921 AS18280 CVC4257J4 MIL-F-18280 2652291C4 DV600CJ

Also referenced as

4781013-0004

Older, superseded, advisory or drawing numbers the federal catalog associates with this NSN — the ones in an old manual.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	D DLA/GSA stocked — stocked by DLA or GSA and issued from central stock
Unit of issue	EA each
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.

In business since 1951 · 30,000+ contracts completed · about SECO & our policies · more questions answered

FAQ

What is NSN 4730-00-919-4651?
NSN 4730-00-919-4651 (4730009194651) — Tube Coupling Nut: SECO Parts has 8 in stock in Augusta, GA, on our own shelf. It is the NATO Stock Number for tube coupling nut in federal supply class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings).

Is NSN 4730-00-919-4651 available?
SECO Parts has 8 in stock in Augusta, GA — order or request a quote below.

How much does NSN 4730-00-919-4651 cost?
NSN 4730-00-919-4651 is a low-cost part, so SECO quotes it by the line rather than by the piece: there is a $50 minimum per line, and quantity pricing on request — usually answered the same business day.

What part numbers cross-reference to NSN 4730-00-919-4651?
Part numbers that cross-reference this NSN include MS21921-4J, SAE-AS18280, VSF1212-4CC, 202-21600C4, AS21921, AS18280, CVC4257J4, MIL-F-18280. It is also referenced by older, superseded or advisory numbers: 4781013-0004. SECO can quote against any of them.