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Datasheet. 878B-4MB-21 specification
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
3a nut thread
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
3a stud thread
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 nut thread
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 stud thread
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
0.615in. nut thread and 0.635in. nut thread ⁓41/64"
A measurement of the extent of threads,including incomplete threads,along a line parallel to the longitudinal axis.
0.638in. stud thread and 0.648in. stud thread ⁓21/32"
An element inserted into the fastener,or a design feature,that enables the fastener to effectively resist vibration and rotation.
ring, lock serrated
The length of the enlarged portion/s/ located on the shank of the item.
0.040in. and 0.050in.
The dimension measured along the longitudinal axis with terminated points at the extreme ends of the item.
1.563in. ⁓1-37/64"
0.875in.
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
16 stud thread
The number of threads on the item per linear inch measured on a line parallel to the thread axis.
28 nut thread
A designation that is used for the purpose of general identification of the thread.
0.250in. nut thread ⁓1/4"
A designation that is used for the purpose of general identification of the thread.
0.375in. stud thread ⁓3/8"
The chemical compound or mechanical mixture properties of which the item is fabricated.
steel comp 4130
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.
MIL-S-6758 mil spec 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.
cadmium
The style designation indicating the configuration that most nearly corresponds to the appearance of the item.
locked in
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
unc stud thread
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.
unf nut thread
Answers.
Unf nut thread
Unc stud thread
Locked in
Steel comp 4130
28 nut thread
16 stud thread
0.638 inches minimum stud thread and 0.648 inches maximum stud thread
0.615 inches minimum nut thread and 0.635 inches maximum nut thread
Right-hand stud thread
Right-hand nut thread
3a stud thread
3a nut thread
FSC 5307 ⁓ Studs
NSN 5307-00-982-0413 STUD,LOCKED IN
unf nut thread thread series locked in cadmium surface treated 28 nut thread thread quantity per inch 1.563" overall length 0.638" stud thread thread length right-hand stud thread 3a stud thread thread class
- NIIN
- 009820413
- NIIN Date
- 10/19/66
- Schedule B
- Name Code
- 16012
- FIIG
- A051A0
- Item Weight
- 0.000lbs
- Item Dimensions
- --
- DEMIL / ITAR
- Uncontrolled item (Code A)
- Hazmat
- No hazard information available from HMIRS.
- MSDS
- N/A
- Precious Metals
- Metal content unknown
- 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. | S246A2-3-1114A | Cage 01556 |
Major End Users Countries and entities
- - Canada
Availability for 878B-4MB-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)
- 093460 BOLTS/NUTS NOI BBC/ZINC
- UFC (universal freight code)
- 48930
Similar by Design Other studs with similar characteristics
Nothing similar to this part number was found in our inventory
878B-4MB-21 / Stud,locked inWhat is the formal definition of this item?
A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. it is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
