TOOLS · US FLAT WASHERS
7/8 in wide pattern flat washer — MS15795-825
This page answers one question: what are the body dimensions of a US (inch) flat washer. The metric flat and spring washer family is a different system with different sizes and thicknesses, and the two are not interchangeable; it has its own chart here: Metric flat and spring washer chart (DIN 125 A / GB/T 97.1)
Answers first
Inside dia ØA
0.938in
ØA tolerance: +.030 / −.007
Outside dia ØB
2.250in
ØB tolerance: +.030 / −.007
Dash no. / part number
MS15795-825
wide · 7/8 in
Thickness C basic
0.165in
Thickness C max
0.192in
Thickness C min
0.136in
The diameters and the thickness are read from the source table; the bearing area in the table below is calculated on this page.
MS15795-825 is a US flat washer: inside diameter ØA 0.938 in, outside diameter ØB 2.250 in, thickness C 0.165 in basic. The two tolerances, the limits of thickness, the bearing area and the other pattern on the same bolt size are below.
Full PDF
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MS15795-825 in full
One value per line, with the basis of each value stated so the source values can be told apart from the calculated ones.
| Parameter | Value | Basis |
|---|---|---|
| Bolt size and pattern | 7/8 in · wide | source |
| Part number | MS15795-825 | source |
| Inside diameter ØA | 0.938 in | source |
| ØA tolerance (upper / lower) | +.030 / −.007 | source |
| Outside diameter ØB | 2.250 in | source |
| ØB tolerance (upper / lower) | +.030 / −.007 | source |
| Thickness C basic | 0.165 in | source |
| Thickness C maximum | 0.192 in | source |
| Thickness C minimum | 0.136 in | source |
| Bearing area A = π/4·(ØB² − ØA²) | 3.2851in² | calculated |
| Source footnote on this row | Unmarked (remainder are preferred sizes Type A) | source |
Values marked calculated are worked out here and are not printed values of the source table: the bearing area A = π/4·(ØB² − ØA²) uses the basic outside and inside diameters, and the inside-diameter offsets use the nominal bolt diameter. The bearing area says how much surface carries the load; it does not replace the dimensions themselves.
Both patterns on this bolt size
The same inside diameter with two outside diameters. The bearing area column shows what the wide pattern adds; it is calculated here from the diameters.
| Pattern | Part number | Outside dia ØB (in) | Thickness C basic (in) | Bearing area (in²)ᶜ |
|---|---|---|---|---|
| narrow · other pattern | MS15795-824 | 1.750 | 0.134 | 1.7143 |
| wide · this page | MS15795-825 | 2.250 | 0.165 | 3.2851 |
Open the narrow pattern page (MS15795-824) →
The other outside diameter on the same bolt size, with its own parameters and tolerances.
Sources and row-level provenance
Every row of the main table is a dash number from Table I of the US military flat washer standard MS15795G (Washer, Flat-Metal, Round, General Purpose, revision G). This page takes its dimension columns — inside diameter, outside diameter, thickness and the two tolerances — and records them row by row, together with the page and row of the collection file so that a single value can be traced back to where it was read.
What this table covers
All 58 dash numbers of that table, 801 to 858: inside diameters ØA from 0.078 in to 3.125 in, outside diameters ØB from 0.188 in to 5.500 in, in the printed order of the source. The table is split over two printed pages, 40 rows and 18 rows, and both pages are included.
The source's own footnotes, counted
The source table marks only a few rows with a footnote. Rather than describing the whole table as one type, this chart reports the footnotes as they are printed, row by row:
- 50 rows carry no footnote; the source describes the remainder of the table as preferred sizes Type A
- 5 rows are marked as selected Type A
- 1 row is marked Type B
- 1 row is marked nonstandard
- 1 row is marked as superseded by AN960-C4
The rows that carry a footnote
Listed one by one, with the inside diameter of each row, so the type labels are never extended to rows the source does not label:
- MS15795-803 — ØA 0.125 in — Selected Type A (source footnote on this row)
- MS15795-804 — ØA 0.125 in — Superseded by AN960-C4 (source footnote on this row)
- MS15795-805 — ØA 0.156 in — Selected Type A (source footnote on this row)
- MS15795-807 — ØA 0.188 in — Selected Type A (source footnote on this row)
- MS15795-850 — ØA 0.203 in — Selected Type A (source footnote on this row)
- MS15795-808 — ØA 0.219 in — Selected Type A (source footnote on this row)
- MS15795-843 — ØA 0.594 in — Type B (source footnote on this row)
- MS15795-840 — ØA 0.604 in — Nonstandard (source footnote on this row)
Version status of the source
MS15795G is recorded as Canceled in the DLA ASSIST index, dated 2000-02-07, and is superseded by NASM15795. The dimensions on this page are the historical table of that document, which is what the USS and SAE names refer to in practice; they are not a list of current part numbers. Before ordering, confirm the equivalent current part number with your supplier.
What this table does not cover
Stated rather than filled in. Values that the source table does not print are not added here from trade catalogues.
- Only one table of the source is collected: the 58 rows of dash numbers 801 to 858. The same document has further tables for other materials, and their rows are not the same set, so no equivalence between them is claimed and they are not merged here.
- Large outside diameter fender washers are not covered: the source table collects selected sizes only, and for a small inside diameter it offers only a few large outside diameter options. The gap is stated, not filled with trade values.
- The type labels on this page come only from the footnotes the source printed on individual dash numbers. Most rows carry no footnote at all, so the table cannot be described as being all of one type, and an unmarked row is not turned into a type by inference.
- Narrow and wide are two outside diameters on the same inside diameter, both collected in the same source table; they are not two separate standards. USS and SAE are used here as the common industry names for the wide and the narrow pattern, and the labels Type A and Type B come from the source's own footnotes.
- Metric flat washers are a different system and are not interchangeable with US washers at the same nominal size; the metric family has its own chart on this site.
- Inch spring lock washers are outside this family: the table collects flat washers only.
Coverage: This page covers one of the 16 washers that have a page of their own; the main chart lists all 58 dash numbers of the source table.
Sources for this washer
- ANSI/ASME B18.22.1 — the current ASME washer standard; rows the source labels Type A or Type B follow its classification.
- MS15795G Washer, Flat-Metal, Round, General Purpose, 1986-07-10, Rev G — Table I, dash numbers 801 to 858 (inside diameter ØA, outside diameter ØB, thickness C and the two tolerances)
Values on this page are compiled from the sources below; the calculated columns are worked out here.
Send the dash numbers, get the matching washers quoted
If your drawing, bill of materials or enquiry sheet calls out washer dash numbers of this series — or a washer by bolt size without naming a pattern — send the callouts as written, the quantities and the project location. We read them against the table on this page, confirm which outside-diameter pattern each line means, and come back with the matching washers together with the documents your incoming inspection asks for.
- Washer callouts as written, by dash number, part number or bolt size
- Which outside-diameter pattern is wanted where the drawing does not say
- Material and finish, and the standard or drawing the washers must meet
- Quantities and the delivery window you are working to
Cite this chart
YAXIIO. 7/8 in wide pattern flat washer — MS15795-825. https://www.yaxiio.com/en/tools/uss-sae-washer-chart/7-8-wide (accessed 2026-10-29).
Free to cite and embed — attribution required: “YAXIIO” + a link to this page.
Frequently asked questions
What are the dimensions of MS15795-825?
Inside diameter ØA 0.938 in, outside diameter ØB 2.250 in, thickness C 0.165 in basic with a maximum of 0.192 in and a minimum of 0.136 in. The upper and lower tolerances of the two diameters are in the table above.
Does MS15795-825 fit the same hole as the other pattern on this bolt size?
Yes, and that is the point of the pair: both patterns were selected for the same bolt size, so their inside diameters are equal or within a few thousandths of an inch of each other, and only the outside diameter changes. If your joint has a spot face or a counterbore, check the outside diameter against it before choosing.
How much extra bearing area does the wide pattern add?
The difference between the two bearing areas, both calculated here as π/4·(ØB² − ØA²) from the basic diameters. The figure for this bolt size is in the pair table above, together with the outside diameters it comes from.
Can I use a metric washer instead of this one?
No. Metric flat washers are a separate system sized in millimetres for metric bolts; a similar nominal size does not make the two interchangeable, and a thickness difference changes how much thread is left for the nut. Match the washer to the fastener system on the drawing.
← All US flat washer dash numbers
Related References
Metric flat and spring washer weight chart
The other washer system: flat washers and spring washers over M6 to M36 with outside diameter, thickness and unit weight.
Inch bolt torque chart
Tightening torque for inch bolts from 1/4 in to 2 in by SAE grade, so a washer change can be checked against the joint it sits in.
Unified inch thread chart (UNC and UNF)
Nominal diameters and thread counts of the unified inch series, to compare with the inside diameter of a washer.
US machine screw size chart
Machine screw sizes the US way, from number 0 to number 12 and from 1/4 in to 1/2 in, with their thread counts.
Washer data on this page is compiled for design and purchasing reference. Dimensions are the values printed in the source table for the dash numbers listed; the source is recorded as canceled and superseded, so confirm the equivalent current part number with your supplier before ordering.