Model: 123256-5R2512

Close Tolerance Screw

Special Features:

Internal drive ribbed

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.228 inches and 0.378 inches
Fastener Length
Between 1.228 inches and 1.248 inches
Head Style
Flat countersunk
Head Diameter
Between 0.577 inches and 0.635 inches
Locking Feature
Detent ball grip
Grip Diameter
Between 0.3108 inches and 0.317 inches
Shank Unthreaded Hole Diameter
0.076 inches first hole and 0.086 inches first hole
Internal Drive Style
Offset cruciform (torque set)
Thread Diameter
0.312 inches
Grip Length
Between 0.750 inches and 0.766 inches
Thready Qty Per Inch (tpi)
24
Hardness Rating
36.0 rockwell c and 41.0 rockwell c
Countersink Angle
Between 99.0 degrees and 101.0 degrees
Distance From Head Largest Bearing Surface To Shank Hole Center
1.123 inches first hole and 1.138 inches first hole
Surface Finish
32.0 microinches bearing surface of head
Surface Finish
32.0 microinches grip
Surface Finish
32.0 microinches threads
Material
Steel comp 630 locking feature or steel comp 631 locking feature or steel comp 440c locking feature
Material
Steel comp e4340 fastener or steel comp 4140 fastener or steel comp 8740 fastener or steel comp 4130 fastener or steel comp 6150 fastener
Material Specification
Ams5643 assn standard 1st material response locking feature or ams5644 assn standard 2nd material response locking feature or qq-s-763 federal specification 3rd material response locking feature
Surface Treatment
Cadmium fastener and chromate fastener
Surface Treatment
Passivate locking feature
Surface Treatment Specification
Qq-p-35 federal specification single treatment response locking feature
Surface Treatment Specification
Qq-p-416 ty2 cl2 federal specification single treatment response fastener
Thread Series Designator
Unjf
NSN
5305-01-265-8955
Part Number
123256-5R2512
Description
Screw,close Tolerance
CAGE
80539

A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.

Part 123256-5R2512 NSN 5305-01-265-8955

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
29294
FIIG:
A003B0
Concept No.:
App. Key:
SS
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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