About this calculator
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 other number a published source ties it to, each with the document and how firm the link is. From there it opens the data sheet row, the calculators that use the part and where to buy it.
Runs in your browser. Tap an example or type your own: MS20426DD5-8, NAS9311M-5-06, 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.
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 (Aero Supplies) lists the Airbus 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.
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; 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, NAS nutplates, LN and NF L numbers come in only when we hold the documents that define them.
- 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 the relationship between the two standards is not in our primary sources, so it does not declare them the same.
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.
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.
- 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.
- 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.
- 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.
- Aero Supplies catalogue, Rivet Cross Reference — Airbus 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.
- Aircraft Spruce catalogue and CherryMAX distributor data sheets — CherryMAX dash numbering, grip ranges and the CR324x oversize series.