Model: BACB12HN4-7

Machine Screw

Special Features:

O-level ata-55; color green on end of threads

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.4375 inches
Fastener Length
Between 0.5625 inches and 0.5775 inches
Head Style
Hexagon
Head Height
Between 0.125 inches and 0.140 inches
Width Between Flats
Between 0.367 inches and 0.376 inches
Internal Drive Style
Cross recess type iii
End Application
Kc-46 tanker
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
28
Min. Tensile Strength (psi)
5820 pounds per square inch
Part Name Assigned By Controlling Agency
Screw, hex head with cross recess, a286 cres, 160ksi
Screw Material
Iron alloy 660
Screw Material Specification
Ams5737 assn standard single material response
Bearing Surface Of Head Surface Treatment
Cadmium
Head Surface Treatment
Cadmium
Screw Surface Treatment
Cadmium
Shank Surface Treatment
Cadmium
Bearing Surface Of Head Surface Treatment Specification
Qq-p-416, type ii, class 2 federal specification single treatment response
Head Surface Treatment Specification
Qq-p-416, type ii, class 2 federal specification single treatment response
Screw Surface Treatment Specification
Qq-p-416, type ii, class 2 federal specification single treatment response
Shank Surface Treatment Specification
Qq-p-416, type ii, class 2 federal specification single treatment response
Bearing Surface Of Head Surface Finish
63.0 microinches
Shank Surface Finish
32.0 microinches
Thread Surface Finish
32.0 microinches
Thread Series Designator
Unjf
Reference Number Differentiating Characteristics
Item is faa certified
NSN
5305-01-651-2093
Part Number
BACB12HN4-7
Description
Screw,machine
CAGE
81205

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 BACB12HN4-7 NSN 5305-01-651-2093

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:
A
ESD:
A
MMAC:
CRITL:
X

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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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