B3878-1

B38781 Key Washer

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Datasheet. B3878-1 specification

Hole Diameter
The length of a straight line which passes through the center of a hole,and terminates at the circumference.

0.640in. ⁓41/64"

External Prebent Key Length

0.125in.

External Prebent Key Width

0.400in.

Distance From Centerline To Inside Of Prebent Key

0.785in.

Overall Distance Including Keys

1.325in.

Material Thickness
A measurement of the smallest dimension of the material,in distinction from length or width.

0.040in.

Minimum Tensile Strength
The maximum rated load in tension applied in a longitudinal direction,per unit of cross-sectional area,that the material can withstand without rupture.

180000 pounds per square inch

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

steel comp 4130

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.

MIL-S-18729 mil spec single material response or ams 6350 assn std single material response

Distance From Centerline To End Of Key

0.825in.

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.

cadmium and chromate

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-416, ty 2, cl 1 fed spec single treatment response

Answers.

What quantity is this sold in?

5EA

What material is the key washer made of ?

Steel comp 4130

What is the thickness?

0.040 inches

What is the inside hole diameter?

0.640 inches

What is the NSN for B3878-1?

5310-01-265-9333

How is this classified for shipping?

Schedule B number: 7318220000
nmfc 194160
Washers other than lock washers, iron or steel

What's the federal classification of B3878-1?

FSC 5310 ⁓ Nuts and washers

Note-nuts and washers, including specially designed, are to be classified in this fsc. a. nuts are a small metal block made in a variety of shapes such as square and hexagonal which is drilled and internally threaded. b. washers are a perforated piece of metal, leather, or other materials of various shapes or forms. they are used primarily as a seat for a bolt, nut, screw, rivet or nail to distribute pressure and prevent endwise motion over an area and/or to prevent movement between two parts by means of restraining features created by the shape of its edges.

Excluding bearing thrust washers (fsc 3120); shims (fsc 5365); ring spacers (fsc 5365); plate spacers (fsc 5365); lock rings (fsc 5365).

NSN 5310-01-265-9333 WASHER,KEY

cadmium surface treated 0.040" material thickness 0.640" hole diameter

NIIN
012659333
NIIN Date
10/19/87
Schedule B
7318220000 
Name Code
01869
FIIG
A022B0
Item Weight
0.100lbs
Item Dimensions
--
QUP
Historical Price
$18.55 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

Major End Users Countries and entities

  • - Department of The Army 
  • - Department of The Navy 
  • - Department of The Air Force 

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Shipping Information

Special Handling
Other or no special handling required (sh) 
LTL (less than a truck load rating)
50.0 
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)
194160 WASHER OR GASKETS, IRON OR STEEL, 
UFC (universal freight code)
55210 

Similar by Design Other washers with similar characteristics

Nothing similar to this part number was found in our inventory

B3878-1 / Washer,keyWhat is the formal definition of this item?

A washer of nonresilient material usually having two parallel bearing surfaces. the outside and/or inside edges have one or more protuberances. the ends and/or edges may be prebent at any angle or the protuberances may be prebent at any angle to the bearing surfaces. the keys or lugs may be fitted into keyways in adjacent material or they may be bent over after application to hold or lock one or more items in place. excludes thrust type washer.