Flat Washer

Item Name Code (INC) 13393

Nuts and Washers
Federal Supply Class: FSC 5310
NATO Supply Classification Class: NSC 5310
Hardware and Abrasives
Federal Supply Group: FSG 53
NATO Supply Classification Group: NSG 53
Item Hits: 177469 - Page 1 of 355
INC 13393 Flat Washer
INC 13393 Flat Washer

A washer having a centrally located hole with a solid or laminated cross-section and two flat parallel bearing surfaces. The hole must be 75 percent or less than the largest dimension and the bearing surface finish is greater than 32 microinch (0.8 micrometer). The thickness cannot exceed 25 percent of the largest outside dimension. When the largest outside dimension is less than 1/4 inch or 6mm, the thickness must be 0.006 inches (0.15mm) or greater and for items 1/4 inch (6mm) or larger, the thickness must be 0.016 inches (0.4mm) or greater. The maximum tolerance is applied to dimensions and used as a determining factor. Items with separable lamination use SHIM. For items fabricated from ceramic or electrically rated materials by specification or industry standards use INSULATOR (1), WASHER. Excludes DISK, VALVE, graphite impregnated and lubricated items.

Additional Information for Flat Washer Additional Information for Flat Washer

Federal Supply Class (FSC) 5310 encompasses various nuts and washers, including flat washers. These washers are essential components used in many applications to distribute load evenly, prevent damage to mating surfaces, and provide isolation.

Here's an overview of flat washers included in FSC 5310:

Function:

  • Distribute load evenly across a larger surface area, preventing concentrated pressure that could damage the mating surfaces.
  • Act as a spacer, providing a gap between the screw head or nut and the surface to prevent binding or galvanic corrosion.
  • Isolate the screw or nut from the surface, preventing electrical conductivity or chemical reactions.

Types:

  • Plain flat washers: The most common type, featuring a flat surface and a central hole. They come in various sizes and thicknesses depending on the application.

  • Fender washers: Similar to plain flat washers but with a larger outside diameter that provides additional bearing surface.

  • Tapered flat washers: Have a slightly conical shape, which helps to compensate for uneven surfaces and ensure proper alignment.

  • Tooth lock washers: Feature small teeth on their inner diameter that bite into the mating surface to prevent the nut or screw from loosening.

  • Split lock washers: Have a split through the middle that creates spring tension, ensuring a tight grip on the screw or nut.

  • Countersunk flat washers: Have a tapered edge that fits into a countersunk hole, providing a flush surface.

Materials:

Flat washers are typically made from various materials, including:

  • Steel: The most common material, offering good strength and durability.
  • Stainless steel: Resistant to corrosion, making it suitable for applications where moisture or chemicals are present.
  • Aluminum: Lightweight and corrosion-resistant, ideal for applications requiring weight reduction.
  • Brass: Offers good electrical conductivity and is resistant to corrosion, making it suitable for electrical applications.
  • Nylon: Provides good insulation and is resistant to chemicals, making it suitable for certain industrial applications.

Applications:

Flat washers are used in various applications, including:

  • Machinery and equipment assembly
  • Electrical and electronic equipment
  • Automotive and aerospace industries
  • Construction and building projects
  • Plumbing and HVAC systems
  • Furniture assembly

Standards:

Flat washers are manufactured according to various standards, including:

  • ANSI/ASME B18.21.1: American National Standard for Flat Washers
  • ISO 7089: International Organization for Standardization standard for Flat Washers
  • DIN 125: German Institute for Standardization standard for Flat Washers
  • BS 4320: British Standards Institution standard for Flat Washers

Procurement:

Flat washers are widely available from various suppliers and distributors of nuts and bolts. They can also be purchased online from various retailers. When purchasing flat washers, it is important to specify the correct size, thickness, material, and finish to ensure they meet your specific needs.

Additional Resources:

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NATO Stock Numbers named Flat Washer NATO Stock Numbers with Item Name 13393 Flat Washer Page 1 of 355
5-4-1312-3-49
RNCC: 5 | RNVC: 9 | DAC: 5
NAS1149F0363P
RNCC: 3 | RNVC: 9 | DAC: 4
MS27183-25
RNCC: 2 | RNVC: 2 | MEDALS: Y | DAC: E
5310000814219
RNCC: 5 | RNVC: 9 | DAC: 9
PC5116290
RNCC: 5 | RNVC: 9 | DAC: 3
5116122
RNCC: 3 | RNVC: 2 | MEDALS: Y | DAC: X
5151921
RNCC: 5 | RNVC: 1 | DAC: 2
60598
RNCC: 3 | RNVC: 2 | DAC: X
5111467
RNCC: 5 | RNVC: 9 | DAC: X
247-7049
RNCC: 3 | RNVC: 2 | DAC: 3
3836243
RNCC: D | RNVC: 9 | MEDALS: Y | DAC: C
FW04PS
RNCC: 3 | RNVC: 2 | DAC: 5
Y/264/20/0001/000 ISSUE 005 ITE-
RNCC: 5 | RNVC: 1 | DAC: 2
ISO7093-2-6-100HV-A2U
RNCC: 5 | RNVC: 2 | DAC: E
SSN.07/Y/275/M.02/034 ITEM 37
RNCC: 3 | RNVC: 2 | DAC: 2
2852-0100-1
RNCC: 3 | RNVC: 1 | DAC: 5
4028881008
RNCC: 5 | RNVC: 9 | DAC: D
ST01238X883
RNCC: 5 | RNVC: 2 | DAC: 4
11144-03178
RNCC: 3 | RNVC: 2 | DAC: 5
282-4810-771642REVCPC105
RNCC: 3 | RNVC: 2 | DAC: X
48-07704-118
RNCC: 3 | RNVC: 1 | DAC: 2
001206450 PART 668
RNCC: 5 | RNVC: 2 | DAC: 2
001291426
RNCC: 5 | RNVC: 1 | DAC: 2
001208437/12/188
RNCC: 5 | RNVC: 2 | DAC: 2
ST-3256-4
RNCC: 3 | RNVC: 2 | DAC: 5
DTF4783C
RNCC: 3 | RNVC: 2 | DAC: 2
X7295322
RNCC: 3 | RNVC: 2 | DAC: 6
889122
RNCC: 3 | RNVC: 2 | DAC: 3
H547-0001-H5470249-0231
RNCC: 5 | RNVC: 1 | DAC: 1
001214204 SHEET 08
RNCC: 5 | RNVC: 2 | DAC: 2
410950-131
RNCC: 3 | RNVC: 2 | DAC: 1
4033259
RNCC: D | RNVC: 9 | DAC: C
GS24265-75
RNCC: 3 | RNVC: 2 | DAC: 5
7383858-262190613-85
RNCC: 5 | RNVC: 1 | DAC: 1
0331030650
RNCC: 3 | RNVC: 2 | DAC: 1
FPWB4M10D120
RNCC: 3 | RNVC: 2 | DAC: 4
001291426
RNCC: 5 | RNVC: 1 | DAC: 2
H547-0001-2642-343-10-10
RNCC: 5 | RNVC: 1 | DAC: 3
4W3343
RNCC: 3 | RNVC: 2 | DAC: 5
10-892456045
RNCC: 3 | RNVC: 2 | DAC: 4
0000173652
RNCC: 2 | RNVC: 1 | DAC: 3
NOREF
RNCC: 3 | RNVC: 1 | DAC: 6
2982378
RNCC: 5 | RNVC: 2 | DAC: 1
05-9481
RNCC: 3 | RNVC: 1 | DAC: 2
7550478-264340501-56
RNCC: 3 | RNVC: 1 | DAC: 1
571-3801-1444715REVAPC105X1132
RNCC: 5 | RNVC: 2 | DAC: X
5510108000
RNCC: 3 | RNVC: 2 | DAC: 5
4850714-9
RNCC: 5 | RNVC: 2 | DAC: 2
4-3DIN433P0LYAMID6
RNCC: 5 | RNVC: 9 | DAC: 9
2572-191500.16.0
RNCC: 3 | RNVC: 2 | DAC: 1
571-5800-1303249REVAPC14
RNCC: 3 | RNVC: 2 | DAC: X
5563983
RNCC: 3 | RNVC: 2 | DAC: 1
VG95211-ML-127018786
RNCC: 2 | RNVC: 2 | DAC: 3
T3131
RNCC: 5 | RNVC: 1 | DAC: 2
HH/4NT2390128-A1
RNCC: 5 | RNVC: 2 | DAC: 3
810-061-0026
RNCC: 5 | RNVC: 2 | DAC: 2
C20156-A100-C438
RNCC: 3 | RNVC: 2 | DAC: 1
845-4687698 ITEM NO 11D4
RNCC: 5 | RNVC: 2 | DAC: 6
S9011F84-032
RNCC: 3 | RNVC: 2 | MEDALS: Y | DAC: 1
7Y1R3
RNCC: 5 | RNVC: 9 | DAC: B
32-71082-3
RNCC: 3 | RNVC: 2 | DAC: 2
501/11/32
RNCC: 5 | RNVC: 1 | DAC: 2
2300211-182200.015.0
RNCC: 2 | RNVC: 2 | DAC: 3
PE 6990/18
RNCC: 3 | RNVC: 2 | DAC: 2
2,5DIN433-2.0321-J3P
RNCC: 5 | RNVC: 9 | DAC: 9
5562443
RNCC: 3 | RNVC: 2 | DAC: 1
1492-310
RNCC: 5 | RNVC: 2 | DAC: 1
3407
RNCC: 3 | RNVC: 2 | DAC: 2
Q EDE F/2888-530-011C
RNCC: 5 | RNVC: 2 | DAC: 6
B60719
RNCC: 5 | RNVC: 2 | DAC: 2
0730 002 066
RNCC: 3 | RNVC: 2 | DAC: 1
609/3/39
RNCC: 5 | RNVC: 1 | DAC: 2
GMA9235
RNCC: 3 | RNVC: 9 | DAC: 2
2430101680
RNCC: 3 | RNVC: 2 | DAC: 1
SSSD1851005
RNCC: 3 | RNVC: 2 | DAC: 4
144L02500
RNCC: 3 | RNVC: 2 | DAC: 5
160445
RNCC: 3 | RNVC: 2 | DAC: 9
M/450/60/8/3
RNCC: 5 | RNVC: 2 | DAC: 2