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MS20426 rivet — 100° countersunk, precision head (now NASM20426)

Rivet, Solid, Countersunk 100°, Precision Head, Aluminum and Titanium Columbium Alloy, from MS20426 Rev. L. Every row below is transcribed from the standard and has its own link.

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MS20426 at a glance

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MS20426, rivet, solid, countersunk 100°, precision head, aluminum and titanium columbium alloy
MS20426
MS20426 engineering drawing with dimensions
Engineering drawing · dimensions in inches
Current standard: NASM20426. MS20426 is now controlled by NASM20426 (MS20426L Notice 1 (18 Aug 1998)). The part numbers do not change: MS20426AD2-2 is still the number on drawings, IPCs and bags, and it is the same part. Order it by that number; the current document is NASM20426.

Specification

ItemValue
Current standardNASM20426 (part numbers unchanged)
TypeSolid rivet, 100° countersunk head
MaterialAluminum 1100-F (A91100) and aluminum alloys 2017-T4, 2024-T4, 2117-T4, 2219-T81, 2219-T62, 5056-H32 and 7050-T73 per QQ-A-430; titanium columbium alloy 45Cb (R58450) per AMS 4982
ItemValue
FinishDefault by alloy code; finish code after the length. No code: chemical surface treatment per MIL-C-5541 Class 1A, gold/yellow. A: anodize per MIL-A-8625 Type II Class 1, clear. D: anodize Type II Class 1, dichromate seal. F: option of any finish except as noted in the standard. S: MIL-C-5541 Class 1A, clear. N: anodize Type II Class 2. Titanium columbium: no finish required
ProcurementMIL-R-5674
StatusCancelled and superseded by NASM20426 (Notice 1, 18 Aug 1998); part numbers unchanged. D, DD and K are inactive for new design.

Dimensions by size

Dimension, in1/163/321/85/323/167/321/45/163/8
D — Shank diameter (+.003 / -.001).062.094.125.156.187.219.250.312.375
A — Head diameter (± .004, to theoretical sharp corners).114.179.225.286.353.415.476.564.694
B — Head height (reference).022.036.042.055.070.083.095.106.134
C — Approx. material for full shop head.094.141.188.234.281.328.375.469.562
E — Land height (see drawing).004 ± .002.004 ± .002.005 ± .002.005 ± .002.006 ± .003.006 ± .003.008 ± .003.010 ± .004.010 ± .004
S — End chamfer.016.023.031.039.047.054.062.078.094
T — End radius.019.029.039.049.059.069.078.098.117

Maximum – minimum as tabulated in MS20426 Rev. L; letters as on the standard's drawing.

Part numbers

Every part number of MS20426 Rev. L, each with its own link. Codes (material, finish) build the full number in the box below.

1/169 part numbers

Part no.Length, inAlloy codes
MS20426AD2-2.125All
MS20426AD2-3.1875All
MS20426AD2-4.250All
MS20426AD2-5.3125All
MS20426AD2-6.375All
MS20426AD2-7.4375All
MS20426AD2-8.500All
MS20426AD2-9.5625All
MS20426AD2-10.625All

3/3214 part numbers

Part no.Length, inAlloy codes
MS20426AD3-2.125All
MS20426AD3-3.1875All
MS20426AD3-4.250All
MS20426AD3-5.3125All
MS20426AD3-6.375All
MS20426AD3-7.4375All
MS20426AD3-8.500All
MS20426AD3-9.5625All
MS20426AD3-10.625All
MS20426AD3-12.750All
MS20426AD3-14.875All
MS20426AD3-161.000All
MS20426AD3-201.250All
MS20426AD3-322.000AD

1/817 part numbers

Part no.Length, inAlloy codes
MS20426AD4-3.1875All
MS20426AD4-4.250All
MS20426AD4-5.3125All
MS20426AD4-6.375All
MS20426AD4-7.4375All
MS20426AD4-8.500All
MS20426AD4-9.5625All
MS20426AD4-10.625All
MS20426AD4-12.750All
MS20426AD4-13.8125All
MS20426AD4-14.875All
MS20426AD4-161.000All
MS20426AD4-181.125All
MS20426AD4-201.250All
MS20426AD4-221.375All
MS20426AD4-241.500All
MS20426AD4-281.750All

5/3217 part numbers

Part no.Length, inAlloy codes
MS20426AD5-4.250All
MS20426AD5-5.3125All
MS20426AD5-6.375All
MS20426AD5-7.4375All
MS20426AD5-8.500All
MS20426AD5-9.5625All
MS20426AD5-10.625All
MS20426AD5-11.6875A, AD
MS20426AD5-12.750All
MS20426AD5-14.875All
MS20426AD5-161.000All
MS20426AD5-181.125All
MS20426AD5-201.250All
MS20426AD5-221.375All
MS20426AD5-241.500All
MS20426AD5-281.750All
MS20426AD5-322.000All

3/1619 part numbers

Part no.Length, inAlloy codes
MS20426AD6-5.3125All
MS20426AD6-6.375All
MS20426AD6-7.4375All
MS20426AD6-8.500All
MS20426AD6-9.5625All
MS20426AD6-10.625All
MS20426AD6-11.6875AD
MS20426AD6-12.750All
MS20426AD6-14.875All
MS20426AD6-15.9375All
MS20426AD6-161.000All
MS20426AD6-181.125All
MS20426AD6-201.250All
MS20426AD6-221.375All
MS20426AD6-241.500All
MS20426AD6-281.750All
MS20426AD6-322.000All
MS20426AD6-402.500All
MS20426AD6-483.000All

7/3216 part numbers

Part no.Length, inAlloy codes
MS20426AD7-6.375All
MS20426AD7-7.4375All
MS20426AD7-8.500All
MS20426AD7-9.5625All
MS20426AD7-10.625All
MS20426AD7-12.750All
MS20426AD7-14.875All
MS20426AD7-161.000All
MS20426AD7-181.125All
MS20426AD7-201.250All
MS20426AD7-221.375All
MS20426AD7-241.500All
MS20426AD7-281.750All
MS20426AD7-322.000All
MS20426AD7-402.500All
MS20426AD7-483.000All

1/417 part numbers

Part no.Length, inAlloy codes
MS20426AD8-6.375All
MS20426AD8-7.4375All
MS20426AD8-8.500All
MS20426AD8-9.5625All
MS20426AD8-10.625All
MS20426AD8-12.750All
MS20426AD8-14.875All
MS20426AD8-161.000All
MS20426AD8-181.125All
MS20426AD8-201.250All
MS20426AD8-221.375All
MS20426AD8-241.500All
MS20426AD8-281.750All
MS20426AD8-322.000All
MS20426AD8-342.125AD
MS20426AD8-402.500All
MS20426AD8-483.000All

5/1615 part numbers

Part no.Length, inAlloy codes
MS20426AD10-7.4375All
MS20426AD10-8.500All
MS20426AD10-9.5625All
MS20426AD10-10.625All
MS20426AD10-12.750All
MS20426AD10-14.875All
MS20426AD10-161.000All
MS20426AD10-181.125All
MS20426AD10-201.250All
MS20426AD10-221.375All
MS20426AD10-241.500All
MS20426AD10-281.750All
MS20426AD10-322.000All
MS20426AD10-402.500All
MS20426AD10-483.000All

3/814 part numbers

Part no.Length, inAlloy codes
MS20426AD12-8.500All
MS20426AD12-9.5625All
MS20426AD12-10.625All
MS20426AD12-12.750All
MS20426AD12-14.875All
MS20426AD12-161.000All
MS20426AD12-181.125All
MS20426AD12-201.250All
MS20426AD12-221.375All
MS20426AD12-241.500All
MS20426AD12-281.750All
MS20426AD12-322.000All
MS20426AD12-402.500All
MS20426AD12-483.000All

Part number

What each code means

PartMeaning
FormatMS20426<material><dash>
AMaterial: 1100-F aluminum (head plain)
ADMaterial: 2117-T4 aluminum alloy (dimpled head)
BMaterial: 5056-H32 aluminum alloy (raised cross)
DMaterial: 2017-T4 aluminum alloy, inactive for new design (raised teat)
DDMaterial: 2024-T4 aluminum alloy, inactive for new design (raised double dash)
KMaterial: 2219-T81 aluminum alloy, inactive for new design (indented square)
EMaterial: 7050-T73 aluminum alloy (indented ring)
TMaterial: Titanium columbium alloy 45Cb (indented diamond)
JMaterial: 2219-T62 aluminum alloy (indented triangle)
ExampleMS20426AD4-5 — 2117-T4 aluminum alloy, 1/8 in diameter, 5/16 in long

Notes from the standard

  • Dimensions are in inches. Tolerances unless otherwise specified: decimals ± .010.
  • For part numbers of rivet length not listed, show the 1/16 increment required.
  • Additional 1/32 length increments are obtained by adding -5 after the last digit or letter of the part number: MS20426AD4-12A-5 is 2117-T4, 1/8 diameter, 3/4 + 1/32 long, anodize clear.
  • Diameter is in 1/32 in and length in 1/16 in. In the alloy column, All means A, AD, B, D, DD, E, K, T and J are all tabulated for that dash; otherwise only the listed codes are.
  • Ring on 7050 rivets: outer diameter at most 75% of shank diameter, depth at most .010. Required on 7050 rivets manufactured after 2 July 1990.
  • Manufacturer's identification is required to be depressed on rivet heads with a shank diameter of .125 and larger manufactured after 2 July 1990.
  • Aluminum alloy 2017-T4 rivets with 33 ksi minimum undriven shear strength were acceptable until 2 July 1990.
  • Rivets may be furnished with plain ends, or with chamfered or radiused ends to the S and T dimensions.
  • The conical surface of the head shall be concentric with the shank within .005 (.010 FIM). Head-cocking angle relative to the rivet axis 1/2° max.
  • .001 in shank diameter increase permissible within .100 in of the base of the head.
  • Interchangeability with AN426: MS20426 rivets of like dash numbers are universally, functionally and dimensionally interchangeable.

Where to buy

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Calculators

CalculatorRivet Length CalculatorSolid rivet length calculatorCalculatorRivet Alloy & Icebox CheckIdentify a rivet's alloy from its head marking and AN code, and whether it must be kept…CalculatorRivet Shop Head InspectionCheck a driven rivet's shop head against the FAA Handbook's minimum, preferred and maximum and…CalculatorPart number cross-referenceType any MS20426 number and see its other names.

Guides

GuideForming and heat treatmentWhich aluminium temper to form, annealing and work hardening, quench and the 212 F limit for…ChartRivet Identification ChartIdentify a solid aircraft rivet by its head markingChartDrill Size per Rivet ChartDrill size per rivetChartFastener cross-referenceFrequent fastener crosses with their supersession status

How to do it

Standard practiceRivet identificationHow to identify an aircraft rivet

Tools

Tool guideRivet cuttersHow to use a rivet cutter to trim a rivet to length

Data sheets

Material2117 Aluminum2117 aluminum, the AD rivet alloyMaterial2017 Aluminum2017 aluminumMaterial5056 Aluminum5056 aluminumData sheetSolid rivetsThe family side by side.

Buy

Distributors coming soon.

Sources

Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.
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