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Datasheet. HT4027-4-21 specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
3a
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
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
0.469in. ⁓15/32"
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.
1.767in. and 1.797in. ⁓1-51/64"
The style designation indicating the configuration that most nearly corresponds to the appearance of the head.
fillister countersunk
The length of a straight line which passes through the center of a circular head,and terminates at the circumference.
0.390in. and 0.395in.
A measurement from the bottom to the top of the head,in distinction from depth.
0.015in. ⁓1/64"
The length of a straight line which passes through the center of the grip,and terminates at the circumference.
0.249 mils and 0.250 centimeters
A measurement of the longest dimension of the point,in distinction from width.
0.045in.
The style designation indicating the configuration that most nearly corresponds to the appearance of the point.
flat
The style designation indicating the configuration that most nearly corresponds to the appearance of the internal drive.
HIGH-Torque
The nominal length of a straight line which passes through the center of the threaded portion,and terminates at the circumference.
0.250in. ⁓1/4"
A measurement of the longest dimension of the grip,in distinction from width.
1.313 in.
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
28
The included angle of the countersink.
99.0 degrees and 101.0 degrees
45.0 of standard range single treatment response
The name assigned to the item by the government agency or commercial organization controlling the design of the item.
screw, close tolerance, 100 deg countersunk, reduced head, HI-Torque, NON-Magnetic cres (125 ksi fsu)
Those unusual or unique characteristics or qualities of an item not covered in the other requirements and which are determined to be essential for identification.
head has a 1.40 degree radius dome
The chemical compound or mechanical mixture properties of which the item is fabricated.
nickel alloy 718
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
ams 5662 assn std single material response
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
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.
ams 2700, method 1 assn std single treatment response
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.
Unjf
Nickel alloy 718
28
1.313 inches
Fillister countersunk
0.469 inches
Right-hand
3a
Schedule B number: 7508900000
nmfc 096640
Other articles of nickel (excluding cloth, grill & netting of nickel wire)
FSC 5305 ⁓ Screws
NSN 5305-01-591-0047 SCREW,CLOSE TOLERANCE
unjf thread series passivate surface treated head has a 1.40 degree radius dome screw, close tolerance, 100 deg countersunk, reduced head, hi-torque, non-magnetic cres (125 ksi fsu) 28 thread quantity per inch 1.313 " grip length fillister countersunk head style 0.469" thread length right-hand 3a thread class
- NIIN
- 015910047
- NIIN Date
- 01/06/11
- Schedule B
- 7508900000
- Name Code
- 29294
- FIIG
- A003B0
- QUP
- Historical Price
- $4.25 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. | ST3M557-4-21 | Cage 76301 |
| 2. | ST3M557-421 | Cage 06710 |
| 3. | ST3M557-4-21 | Cage 0K6Z0 |
| 4. | ST3M557-4-21 | Cage 0ZC92 |
| 5. | ST3M557-4-21 | Cage 1VSL7 |
| 6. | ST3M668-4-21 | Cage 4WL75 |
| 7. | 11923-4-21 | Cage 59563 |
| 8. | WC4027-4-21 | Cage 60516 |
| 9. | ST3M557-4-21 | Cage U6683 |
Major End Users Countries and entities
- - Department of The Air Force
Availability for HT4027-4-21 A member of our team will provide you with a price and availability quote
Request a Quote »Shipping Information
- Special Handling
- Other or no special handling required (sh)
- LTL (less than a truck load rating)
- 70.0
- LCL (less than a car load rating)
- Unknown
- 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
- Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater
- Commodity (for shipments via water)
- Metal hardware
- NMFC (national motor freight code)
- 096640 SCREWS, IRON OR STEEL
- UFC (universal freight code)
- 50600
Similar by Design Other screws with similar characteristics
Nothing similar to this part number was found in our inventory
HT4027-4-21 / 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.
