Model: MIL-B-857/QQ-N-281

Hexagon Head Cap Screw

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
2.250 inches
Fastener Length
5.000 inches
Head Style
Hexagon
Head Height
Between 0.591 inches and 0.627 inches
Width Between Flats
Between 1.469 inches and 1.500 inches
Thread Diameter
1.000 inches
Thready Qty Per Inch (tpi)
8
Criticality Code Justification
Zzzw
Material
Nickel alloy
Material Specification
Qq-n-281 federal specification single material response
Thread Series Designator
Unc
Departure From Cited Document
Material will be in accordance with ships parts control center activity hx quality control, manufacturing and testing specifications
NSN
5305-01-201-8872
Part Number
MIL-B-857/QQ-N-281
Description
Screw,cap,hexagon Head
CAGE
81349

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. the threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. the thread length being the controlled dimension, the grip length is not specified. a locking feature may be incorporated in the design of the head or threads. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. excludes bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

Part MIL-B-857/QQ-N-281 NSN 5305-01-201-8872

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
18257
FIIG:
A003B0
Concept No.:
App. Key:
SB
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:
C

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
6.0 X 2.0 X 2.0
Paclk Weight:
0.8000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
M
SPI No.:
SPI Rev.:
SPC Mkg:
99
LVL_A:
E
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
093470
UFC:
48940
LTL:
70.0
LCL:
70.0
WCC:
573
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7508900000
  • SITC: 69975
  • End Use: Finished metal shapes
  • NAICS: 332999
  • USDA: 1

Freight Class: Other articles of nickel, nesoi (excluding cloth, grill & netting of nickel wire)

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