Where to buy
Distributors coming soon.
About this calculator
Looking for the equivalent of a part number? An AN470 from a 1980s manual, a NAS9304B on the drawing, a CR3243 in the bin, a BACR15FR in the Boeing IPC: often the same part under different numbers. Type one in and the decoder reads it digit by digit, gives its real size in inches and millimetres, and lists every equivalent a published source ties it to, each with the document and how firm the link is. Where no equivalent is documented it shows the nearest sizes below and above, labelled as what they are: neighbours, not approved substitutes. From there it opens the data sheet row, the calculators that use the part and the distributor finder, which answers where to buy it.
Runs in your browser. Tap an example or type your own: MS21209C0420 and NAS1222-04E have 19 equivalents each; try ASNA0081-203 to see the nearest sizes when no equivalent is documented. Also MS20470AD4-5, NAS1097AD4-5, MS20426DD5-8, BACR15FR, ASNA0078, QQ-A-250/4, AN4C12A. For nutplates, add a quantity to weigh the batch.
What it reads, and from where
Solid rivets. AC 43.13-1B Figure 4-4 breaks MS20470AD4-7 into head type (MS20470), material code (AD), diameter in 1/32 in (4) and length in 1/16 in (7). Its table gives the codes: A 1100, AD 2117, D 2017-T, DD 2024, B 5056, E 7050, M Monel. Paragraphs 4-57 and 7-1 give the links. MS20470 supersedes AN470, MS20426 supersedes AN426, and all protruding-head rivets (AN430 round, AN442 flat, AN455 and AN456 brazier) may be replaced by MS20470.
Supersession is not equivalence. MS20470 supersedes AN470 and MS20426 supersedes AN426, and each standard says rivets of like dash numbers are universally, functionally and dimensionally interchangeable (MS20470H and MS20426L, note 2). The decoder marks those as supersession, in both directions. MS20426L was itself cancelled for NASM20426 with identical part numbers (Notice 1, 18 Aug 1998), so the number you order is still MS20426. We hold no such notice for MS20470.
NAS1097. AC 43.13-1B Table 7-10 lists it as a solid rivet with a 100° flush shear head in aluminium alloy, and Cherry calls it the reduced 100° flush head (CA-1015 p. 3). The dashes read like MS20426, but it is not an equivalent: a NAS1097 carries the head of the next size down, so a 5/32 in NAS1097 has the head of a 1/8 in MS20426. That is why it is used in oversize holes without recutting the countersink. Oversize rivets of the standard series keep the head of their nominal size. We do not hold the NAS1097 standard itself, so sizes come from a distributor listing and are flagged.
CherryMAX. In CR3213-4-02 the middle dash is the diameter in 1/32 in and the last the maximum grip in 1/16 in. CR3212 is the 100° head, and CR3243 and CR3242 are the oversize series.
Blind rivets: one part, many names. Cherry's own NAS vs. CherryMAX list (CA-1015, p. 27) ties each NAS9301–9312 number to its CherryMAX part: NAS9304B is CR3243, NAS9302B is CR3212. The Cherry Tool Catalog (2019 ed., p. 26) adds the military M7885 slash sheets and the Boeing BACR15FR/FP numbers. A distributor cross lists the ASNA0077/0078 numbers and calls itself reference only, so those links are flagged to confirm. Howmet's tooling list sets HuckMAX HC3212/HC3213 against ASNA0077/0078. NAS and Cherry numbers share their dashes, diameter in 1/32 in then maximum grip in 1/16 in, so NAS9304B-5-04 is CR3243-5-04.
How firm each link is. ✅ printed by the manufacturer or the standard. 🟢 the source allows it as a replacement. 🟡 a distributor table, or a line where a source disagrees with itself: confirm against the standard. ℹ for information. Nothing is crossed by copying digits and nothing is guessed: a number the sources do not list is reported as such. 🔁 and ↩ mark a supersession: the number that replaces it and the number it replaced.
Nearest is not equivalent. Solid rivets and CherryMAX get the dash just below and just above in diameter and in length or grip, in their own standard and in the others, from the tables of MS20470H, MS20426L and Cherry CA-1015. When no equivalent is documented, for example a metric ASNA0081 bolt against inch-coded PLT bolts, the decoder lists the size just below and just above in the other standards, with the listed dimension and the difference in inches and millimetres. These are neighbours on the data sheets only. They are labelled NEAREST, shown apart from the documented equivalents, and never approved as substitutes: only the applicable manual or engineering can authorise a substitution.
Sheet specifications. MIL-HDBK-5J tabulates the material specifications for each alloy and product form. For bare 2024 sheet and plate it lists AMS 4037, AMS 4035 and AMS-QQ-A-250/4. The decoder shows the other specifications listed for the same alloy and form. They are not declared interchangeable: tempers and requirements differ by document.
AN bolts and MS nutplates. These come from the AN bolt and nutplate data sheets, each transcribed from its standard. In AN4C12A, AN4 is 4/16 in, C corrosion-resistant steel, -12 the grip and length from the standard's table, A an undrilled shank. In MS21047L08K, L is dry film lubricant, 08 the thread size and K countersunk or dimpled rivet holes. The decoder draws the part to scale from its row, gives the piece weight where the standard lists one per 100, and links to that row. The AN machine screws (AN502 to AN530) are read the same way, and NASM3 to NASM20 bolts and NASM525 screws read as the AN numbers they kept.
Why size first. Some standards code sizes in fractions of an inch, others in millimetres. A cross made by copying digits gives a wrong part. Every number here is turned into its physical size before any other number is shown.
Worked example
A 1983 repair drawing calls for AN470AD4-6.
- AN470: universal head. AD: 2117. 4: 4/32 = 1/8 in (3.18 mm). 6: 6/16 = 3/8 in (9.53 mm) under the head.
- AC 43.13-1B 7-1a: MS20470 supersedes AN470.
Order MS20470AD4-6: the same rivet under the number that superseded it.
Limits — when NOT to use this
- The SRM and IPC govern. A cross shown here is what a source states, not an approval to substitute on a given aircraft.
- Families covered so far. AN, MS and NASM solid rivets; NAS1097; NAS9301–9312 and CherryMAX blind rivets with their M7885, BACR15 and ASNA names; AN3 to AN8 bolts; 14 MS nutplates; sheet specifications for four alloys. CherryLOCK, other blind fasteners, the Boeing solid rivet lines, NAS nutplates, LN and NF L numbers come in only when we hold the documents that define them. Until then the decoder names the family where a source does, and shows the closest family we read.
- Specifications are not part numbers. Two specifications for the same alloy and form can differ in temper, tolerances and testing.
Questions people actually ask
Is MS20470 the same as NASM20470?
The decoder reads NASM20470 with the same numbering as MS20470, but we hold no cancellation notice for MS20470, so it does not declare them the same. For MS20426 we do: Notice 1 to MS20426L cancels it in favour of NASM20426 and keeps the part numbers identical.
Is NAS1097 the same as MS20426?
Not a direct equivalent, but it is a repair solution for loose rivets. A NAS1097 carries the head of the next size down, so the dashes do not mean the same head. Example: a loose 1/8 in MS20426 in a countersink. Open the hole to 5/32 in and fit a 5/32 in NAS1097: it keeps the 1/8 in head and the countersink is not touched. The repair is authorised by the manual or engineering, after checking edge distance, pitch and strength.
What is a repair rivet?
A solid oversize rivet: the head is the same size and shape, so it looks the same from outside, and the shank is 1/64 in bigger. It is used for a loose rivet or a slightly elongated hole. NAS1241 replaces MS20426 and NAS1242 replaces MS20470 with the same suffix (Cessna SRM 51-40-00). The manual or engineering authorises it and gives the hole.
Is AN470 the same as MS20470?
MS20470 supersedes AN470, and MS20470H note 2 says rivets of like dash numbers are universally, functionally and dimensionally interchangeable. The same note in MS20426L covers AN426 and MS20426. The SRM or IPC still governs on a given aircraft.
Is NAS9301B the same as CR3213?
Cherry's own cross-reference list (CA-1015, p. 27) gives CR3213 as the CherryMAX part for NAS9301B, with the same diameter and grip dashes. Whether you may fit it on a given aircraft is the SRM's or the IPC's call, not the decoder's.
Why are the ASNA links marked yellow?
They come from a distributor's cross table that calls itself reference only. They are shown so you can find the part, flagged so you check the ASNA standard before you order.
What is the equivalent of a part number?
The equivalent is the other number a published source ties to the same part: a superseding standard, a maker’s table or the same NSN in the DLA records. Type the number and the decoder lists every one it holds, with the document each comes from. Where we hold none it says so.
What if my part number has no equivalent listed?
The decoder shows the nearest sizes: the dash just below and just above, in other standards of the same kind, with their dimension and the difference. A nearest is not an equivalent and not an approved substitute. Only the applicable manual (SRM, IPC) or engineering can authorise a substitution.
Is an ASNA part the same as a NAS or MS part?
Only where a source says so. The blind-rivet ASNA0077 and ASNA0078 numbers share the inch-coded dashes of NAS and Cherry. Others, such as the ASNA0081 and ASNA0082 blind bolts, are sized in millimetres, so no digit-for-digit equivalent exists: the decoder shows the nearest inch sizes instead, as neighbours only.
Can I trust a cross I find here?
Every line names the document it was copied from, and the decoder shows only what that document prints. Open the source, check it, and treat the SRM and IPC as the final word.
Why no LN 9198 cross?
LN and NF L are millimetre-coded standards. We will add them when we hold the documents that define them, rather than crossing by rounding.
Sources
- FAA AC 43.13-1B CHG 1, Figure 4-4, par. 4-57 and 7-1 — rivet part number breakdown and material codes; MS20470 supersedes AN470, MS20426 supersedes AN426; protruding heads replaceable by MS20470; AN430, AN442, AN455/456 head types.
- MS20470H (14 Sep 1993), Rivet, Solid, Universal Head — note 2 on AN470, length tables pp. 3-5, Table I head diameters.
- MS20426L (14 Sep 1993) and Notice 1 (18 Aug 1998), Rivet, Solid, Countersunk 100° — note 2 on AN426, length tables pp. 3-5, Table I head diameters; cancellation for NASM20426 with identical part numbers.
- FAA AC 43.13-1B CHG 1, Table 7-10 (p. 7-49, 7-50) — rivet family descriptions, including NAS1097, NAS1198, NAS1199 and MS20427.
- A distributor's listing, NAS1097 rivets — NAS1097AD sizes. Distributor data: the NAS1097 standard itself is not held.
- MIL-HDBK-5J, Tables 3.2.1.0(a), 3.2.3.0(a), 3.6.2.0(a), 3.7.6.0(a) — material specifications and product forms for 2014, 2024, 6061 and 7075.
- AN3 thru AN20 Rev. 12, 14 Jan 1991 — Bolt, Machine, Aircraft — AN bolt codes, grip and length. Each MS nutplate standard is cited by revision on its own data sheet.
- Cessna Single Engine Structural Repair Manual, 51-40-00, par. 4.A — repair rivets: 1/64 in bigger shank, same head, NAS1241 for MS20426 and NAS1242 for MS20470 with the same suffix; 1/32 in larger rivet.
- Cherry CA-1011, CherryMAX manual, pp. 4, 9-16 — nominal and 1/64 in oversize, head diameters, hole limits and drills.
- US 4832548, US 5123792 and US 5153978 (patents) — washers built into blind fasteners for composite, low bearing strength of laminates, corrosion of aluminium rivets in some composites. Background, not approved data.
- Cherry Aerospace CA-1015, CherryMAX process manual — NAS vs. CherryMAX cross-reference list, p. 27 — NAS9301–9312 to CherryMAX CR numbers, including the ML, MN and MP variants; the dash code note; diameters and reduced head (p. 3), grip table (p. 4), countersink for MS20426 and NAS1097 heads (p. 7).
- Cherry Aerospace Fastening Systems Tool Catalog, 2019 edition, Section 7, p. 26 — military M7885 and Boeing BACR15 numbers against NAS and Cherry part numbers. The link goes to the current tool catalogue; the 2019 edition is the one that prints this table.
- Distributor catalogue, Rivet Cross Reference — ASNA0077/0078 numbers against NAS and Cherry. Distributor data, marked reference only.
- Howmet Fastening Systems Tooling Catalog, p. 12 — HuckMAX HC3212/HC3213 listed against customer numbers ASNA0077/0078.
- A distributor's catalogue and CherryMAX distributor data sheets — CherryMAX dash numbering, grip ranges and the CR324x oversize series.