Model: 1/4-20UNC3A QQN -281D CL A OR B

Socket Head Cap Screw

Properties:

Thread Class

Thread Direction

Right-hand

Thread Length

Between 0.525 inches and 0.625 inches

Fastener Length

0.625 inches

Head Style

Flat chamfer

Head Diameter

Between 0.365 inches and 0.375 inches

Head Height

Between 0.244 inches and 0.250 inches

Internal Drive Style

Hexagon

Thread Diameter

0.250 inches

Width Across Flats

0.188 inches

Thready Qty Per Inch (tpi)

Min. Tensile Strength (psi)

180000 pounds per square inch

Hardness Rating

39.0 rockwell c and 45.0 rockwell c

Minimum Yield Strength

155000 pounds per square inch

Material

Nickel alloy k-500

Material Specification

Qq-n-281 federal specification single material response

Thread Series Designator

Unc

NSN

5305-01-440-4891

Part Number

1/4-20UNC3A QQN -281D CL A OR B

Description

Screw,cap,socket Head

CAGE

D9182

An externally threaded fastener whose threaded portion is of one nominal diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See bolt, internal wrenching. Excludes screw, shoulder; and screw, machine.

Part 1/4-20UNC3A QQN -281D CL A OR B NSN 5305-01-440-4891

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

16282

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:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

096640

UFC:

50600

LTL:

70.0

LCL:

WCC:

713

TCC:

SHC:

ACC:

Construction Materials

Pricing & Availability Check

Submit this form for stock availability and pricing.

How to Order

Ordering from buyaircraftparts.com

If you would like to order this socket head cap screw (NSN 5305-01-440-4891) please submit the pricing and availability form above to receive an up to date quote by email. If you agree to the pricing and terms you can e-sign your order online!

We are pleased to have the opportunity to serve you.

Have a Question

Hours:	08:00-18:00 Eastern Standard Time
Phone:	+1 470-231-0824
Email:	Contact Form »

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)