Model: AS255B4-35

Close Tolerance Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.277 inches and 0.328 inches

Fastener Length

Between 2.606 inches and 2.626 inches

Head Style

Flat chamfer

Head Diameter

Between 0.477 inches and 0.492 inches

Head Height

Between 0.126 inches and 0.141 inches

Locking Feature

Detent ball threads

Grip Diameter

Between 0.2487 inches and 0.2492 inches

Shank Unthreaded Hole Diameter

0.076 inches first hole and 0.086 inches first hole

Internal Drive Style

Slot

Thread Diameter

0.250 inches

Grip Length

Between 2.188 inches and 2.204 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

63000 pounds per square inch

Distance From Head Largest Bearing Surface To Shank Hole Center

2.527 inches first hole and 2.547 inches first hole

Surface Finish

32.0 microinches bearing surface of head

Surface Finish

32.0 microinches grip

Material

Steel comp 302 spring or steel comp 631 spring

Material Specification

Astm a580 cond. A assn standard single material response spring

Surface Treatment

Passivate

Surface Treatment Specification

Qq-p-35 federal specification single treatment response

Thread Series Designator

Unjf

NSN

5305-01-198-3481

Part Number

AS255B4-35

Description

Screw,close Tolerance

CAGE

84256

Part AS255B4-35 NSN 5305-01-198-3481

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

29294

FIIG:

A003B0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

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