Model: 51B221-23

Machine Screw

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
0.276 inches
Fastener Length
Between 1.423 inches and 1.470 inches
Head Style
Pan
Head Diameter
0.381 inches
Head Height
Between 0.103 inches and 0.118 inches
Internal Drive Style
Torque set
Thread Diameter
0.190 inches
Thready Qty Per Inch (tpi)
32
Min. Tensile Strength (psi)
180000 pounds per square inch
Hardness Rating
Between 39.0 rockwell c and 43.0 rockwell c
Screw Material
Steel comp 4340 or steel comp 4140 or steel comp 8740
Screw Material Specification
Mil-s-5000 military specification 1st material response or mil-s-5626 military specification 2nd material response or mil-s-6049 military specification 3rd material response
Shank Surface Finish
32.0 microinches
Thread Series Designator
Unjf
Specification Data
76823-51b221 manufacturers standard
NSN
5305-00-917-0993
Part Number
51B221-23
Description
Screw,machine
CAGE
0JRC1

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. See also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.

Part 51B221-23 NSN 5305-00-917-0993

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06657
FIIG:
A500D0
Concept No.:
App. Key:
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:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.1000lbs
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:
E
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7318152000
  • SITC: 69421
  • End Use: Iron and steel products, other
  • NAICS: 332722
  • USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment

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