Packing Nut

MS21937-4L

(NSN) National Stock Number

4730-00-821-0189

Federal Supply Classification

4730 Hose, Pipe, Tube, Lubrication and Railing Fittings

Item Name Code

18028

Schedule B Code

7616106000

Summary

3b thread class, right-hand thread direction, 0.250 inches nominal thread length, not casehardened casehardening indicator, 0.406 inches nominal overall length, 7/16in-20 thread size

DAC	HCC	DMIL	RNCC
E	-	-	5

RNVC	SADC	MSDS	RNAAC
1	-	-	ZZ

Identification

An item having internal and/or external machine thread(s) (threads other than pipe or hose series), specifically designed to retain, by means or groove(s), shoulder(s), and the like, packing and/or a packing gland within a stuffing box. See also bushing, machine thread; inverted nut, tube coupling; and nut, tube coupling. Excludes:packing nut, stuffing tube; and use with electrical cable, and locknut, pipe.

INC	FIIG	Concept	Condition
18028	T385-E	-	2

Specifications

Thread Class

Details

A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.

Thread Direction

right-hand

Details

The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.

Thread Length

0.250 inches nominal

Details

A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.

Casehardening Indicator

not casehardened

Details

Indicates whether or not a ferrous alloy object has been subjected to a process whereby the outer portion is made substantially harder than the inner portion or core.

Overall Length

0.406 inches nominal

Details

The dimension measured along the longitudinal axis with terminated points at the extreme ends of the item.

Thread Size

7/16in-20

Details

Designates the thread diameter and number of threads per specific measurement scale.

Unthreaded Portion Length

0.156 inches nominal

Details

None.

Largest Inside Diameter

0.562 inches nominal

Details

None.

Screw Thread Series Designator

unf

Details

A designation distinguishing one group of screw thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.

Width Across Flats

1.000 inches nominal

Details

The shortest straight line between flats,perpendicular to the height.

Screw Thread Location

internal

Details

Indicates the location of the screw thread.

Length To Shoulder

0.344 inches nominal

Details

None.

Major Unthreaded Outside Diameter

0.687 inches nominal

Details

None.

Material

aluminum alloy 7075

Details

The chemical compound or mechanical mixture properties of which the item is fabricated.

Style Designator

hexagon, internal thread, shouldered

Details

The style designation indicating the configuration that most nearly corresponds to the appearance of the item.

Specification/Standard Data

81343-sae as21937 manufacturers standard

Details

The document designator of the specification or standard which established the item of supply.

Master-Cross Reference List

Part	CAGE	DAC	HCC	RNCC	RNVC	MSDS	RNAAC
MS21937-4L	R1120	6	-	5	2	-	ZG
MS21937-4L	F0422	3	-	5	2	-	ZF
MS21937-4L	14397	3	-	5	9	-	AX
MS21937-4L	71563	5	-	5	9	-	AX
MS21937-4L	03647	3	-	5	9	-	AX
MS21937-4L	17439	5	-	5	9	-	AX
MS21937-4L	00624	3	-	5	9	-	AX
MS21937-4L	45681	3	-	5	9	-	AX
105-01495	79470	5	-	5	9	-	AX
AS18280	0U583	E	-	5	9	-	ZZ
AS21937	0U583	E	-	5	9	-	ZZ
MS21937-4L	0U583	4	-	3	2	-	ZZ
SAE-AS18280	0U583	E	-	3	1	-	ZZ
AS18280	81343	E	-	5	9	-	ZZ
AS21937	81343	E	-	5	9	-	ZZ
MS21937-4L	50948	5	-	5	9	-	AX
MS21937-4L	96906	3	-	5	9	-	AX

Material and Special Handling

Hazardous material, precious metals, criticality, and electrostatic discharge indicators.

HMIC	PMIC	ESD/EMI	Criticality
N	U	-	-

Freight

Universal / National Freight and Handling Information

UFC	HMC	LTL	LCL
48950	-	W	-

RVC	WCC	TCC	SHC
-	573	Z	9

Certified Supplier

Order with confidence. We are a valued certified supplier serving customers in the military and aerospace industries.

Genuine Manufacturers Parts
100% Product Inspection
7 Year Sales Record Retention
Fast On-Time Delivery
HAZMAT Certified
Global Shipping

Manufacturer

DANFOSS POWER SOLUTIONS II, LLC

CAGE: 01276

MAUMEE , OH , 43537-4004

UNITED STATES

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FAQs

Frequently asked questions for NSN 4730-00-821-0189

What is the NIIN of the NSN 4730-00-821-0189?

The National Item Identification Number (NIIN) of the NSN 4730-00-821-0189 is 00-821-0189

When the NSN 4730-00-821-0189 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Mon, Jan 1, 1962

Does the NSN 4730-00-821-0189 contain any precious metals?

Type/content is unknown

Does the NSN 4730-00-821-0189 contain any hazardous material?

No data in HMIRS

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