HT4020-6-18A

HT4020618A Close Tolerance Screw

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Datasheet. HT4020-6-18A specification

Thread Class
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.

3a

Thread Direction
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.

RIGHT-Hand

Thread Length
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.

0.641in. ⁓41/64"

Fastener Length
The dimension,measured along a line parallel to the longitudinal axis,from the largest bearing surface of the fastener head to the extreme opposite end,or as specifically designated for other type fasteners.

1.750in. and 1.797in. ⁓1-51/64"

Head Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.

flat countersunk undercut

Head Diameter
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.

0.756in. and 0.760in.

Head Height
A measurement from the bottom to the top of the head,in distinction from depth.

0.115in. and 0.117in. ⁓1/8"

Internal Drive Style
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.

HIGH-Torque

End Item Identification
The national stock number or the identification information of the end equipment for which the item is a part.

fighter AIRCRAFT-First (F18 e/f)

Nominal Thread Diameter
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.

0.375in. ⁓3/8"

Thread Quantity Per Inch
The number of threads on the item per linear inch measured on a line parallel to the thread axis.

24

Countersink Angle
The included angle of the countersink.

99.0 degrees and 101.0 degrees

Criticality Code Justification
The master requirement codes of those requirements which are technically critical by reason of tolerance,fit,performance,or other characteristics which affect identification of the item.

agav

Part Name Assigned By Controlling Agency
The name assigned to the item by the government agency or commercial organization controlling the design of the item.

HI-Torque bolt, 100 degree flush sealing head close tolerance

Material
The chemical compound or mechanical mixture properties of which the item is fabricated.

steel comp XM-13

Material Document And Classification
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.

ams 5629 assn std single material response

Surface Treatment
The metallic,nonmetallic,and/or chemical properties with which the item is plated,dipped,and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.

passivate

Surface Treatment Document And Classification
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.

QQ-P-35 fed spec single treatment response

Thread Series Designator
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.

unjf

Answers.

What class is the thread series?

Unjf

What material is the close tolerance screw made of ?

Steel comp xm-13

What is the thread quantity per inch?

24

What is the head style?

Flat countersunk undercut

What is the thread length?

0.641 inches

What is the thread direction?

Right-hand

What is the thread class?

3a

What is the NSN for HT4020-6-18A?

5305-01-477-5625

How is this classified for shipping?

Schedule B number: 7318152000
nmfc 093486
Bolts and bolts and their nuts or washers exported in the same shipment

What's the federal classification of HT4020-6-18A?

FSC 5305 ⁓ Screws

NSN 5305-01-477-5625 SCREW,CLOSE TOLERANCE

Used on fighter aircraft-first (f18 e/f). unjf thread series passivate surface treated hi-torque bolt, 100 degree flush sealing head close tolerance 24 thread quantity per inch flat countersunk undercut head style 0.641" thread length right-hand 3a thread class

NIIN
014775625
NIIN Date
08/14/00
Schedule B
7318152000 
Name Code
29294
FIIG
A003B0
QUP
 
Historical Price
$45.00 EA
DEMIL / ITAR
Uncontrolled item (Code A)
Hazmat
No hazard information available from HMIRS.
MSDS
N/A
Precious Metals
No precious metals
Enviromental
N/A
Electrostatic ESD & EMI
No ESD or EMI sensitivity

Other Part Numbers Parts with same form, fit, and function by other manufacturers

1. ST3M652C6-18A Cage 76301
2. 11925C6-18A Cage 59563
3. ST3M652C6-18A Cage 06710
4. ST3M652C6-18A Cage 0ZC92
5. ST3M652C6-18A Cage 58998
6. ST3M652C6-18A Cage 1VSL7
7. WC4020-6-18A Cage 60516

Major End Users Countries and entities

  • - Department of The Navy 

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Shipping Information

Special Handling
Other or no special handling required (sh) 
LTL (less than a truck load rating)
Rating variable 
LCL (less than a car load rating)
Rating variable
Special Cargo
No special type of cargo code applicable 
Air Freight (Minimum cargo door size required)
Shipment is not a consolidation and does not exceed 84 inches in any dimension. 
Customs Requirement Classification
Supplies and equipment for aircraft and aerial targets, including aircraft and maintenance parts, aircraft accessories, aircraft 
Commodity (for shipments via water)
Bolts or nuts (iron or steel),(less than 35 feet) 
NMFC (national motor freight code)
093486 BOLTS,NUTS OR SCREWS, NOI (SUB 3) 
UFC (universal freight code)
48950 

Similar by Design Other screws with similar characteristics

Nothing similar to this part number was found in our inventory

HT4020-6-18A / Screw,close toleranceWhat is the formal definition of this item?

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.