Model: MS21915-5-4

Boss Reducer

Properties:

Thread Class
3b 1st end
Reducer Type
Concentric
Connection Style
External seat for gasket seal (boss) 2nd end
Connection Style
Gasket seal (boss) 1st end
Connection Type
Threaded external boss 2nd end
Connection Type
Threaded internal boss 1st end
Thread Size
0.438 inches 2nd end
Thread Size
0.500 inches 1st end
Nominallength
1.281 inches
Material
Steel comp 1137 or steel comp 1141 or steel comp 4130 or steel comp 4140
Material Specification
Qq-s-637 federal specification 1st material response and qq-s-637 federal specification 2nd material response and mil-s-6758 military specification 3rd material response and mil-s-5626 military specification 4th material response
Surface Treatment
Cadmium inside
Surface Treatment
Cadmium outside
Surface Treatment Specification
Qq-p-416, type 1, cl 2 federal specification single treatment response inside
Surface Treatment Specification
Qq-p-416, type 1, cl 2 federal specification single treatment response outside
Thread Series Designator
Unjf all ends
NSN
4730-00-403-4358
Part Number
MS21915-5-4
Description
Reducer,boss
CAGE
81343

A straight fitting having a boss connection of a different size at each end. Both connections have external or internal machine threads (straight threads other than pipe or hose series) and are designed to facilitate a gasket, preformed packing, washer, or the like to form a seal at the boss. Excludes bushing (as modified).

Part MS21915-5-4 NSN 4730-00-403-4358

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
23541
FIIG:
A080B0
Concept No.:
App. Key:
A
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.2000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
052190
UFC:
30000
LTL:
RATING VARIABLE
LCL:
50.0
WCC:
576
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7307994000
  • SITC: 67959
  • End Use: Iron and steel products, other
  • NAICS: 332919
  • USDA: 1

Freight Class: Other fittings nesoi of alloy steel not stainless

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