What it is
Where to buyFAA-H-8083-31B (p. 4-53): the Cherry Maxibolt blind bolt, available in alloy steel and A-286 CRES, comes in four nominal and oversize head styles; one tool and pulling head installs all three diameters. It creates a larger blind-side footprint and performs well in thin sheet and non-metallic applications; the flush-breaking stem eliminates shaving and the extended grip range accommodates different thicknesses. It is used where higher loads are required: 112 ksi shear in steel and 95 ksi in A-286. The Cherry G83, G84 or G704 installation tools are required. During installation the shift washer collapses into itself, leaving a solid washer that is easily retrieved.
The titanium version is for compatibility with composite structure, 95 ksi shear, installed from one side with a G-83 or equivalent pneumatic-hydraulic tool, in 100° flush, 130° flush and protruding heads (FAA-H-8083-31B p. 7-47).
Cherry makes the titanium Maxibolt as CR7770S (100° flush), CR7771S and CR7773S (protruding), CR7774S (130° flush) and CR7784S (130° flush, Maxibolt Plus). The sleeve is commercially pure titanium to ASTM B348 Gr. 1 and the stem is 38-6-44 titanium to AMS 4957 (Cherry CA-1010, CR7770S Table 3). There is no MS cross-reference for it (Cherry CA-1039 p. 6).
Reading the ASNA number
ASNA0026SA0506: ASNA0026 is the 100° countersunk head in steel or stainless; S the type (with driving cap or washer, single-action installation, -MB pulling heads; U is without washer, -MBU heads); A the material (alloy steel; B is A-286 stainless); 05 the diameter code (5/32 in nominal); 06 the grip code (0.344 to 0.407 in). ASNA0027 is the protruding cylindrical head.
ASNA0341T0506: titanium, 100° countersunk (ASNA0342 protruding cylindrical, ASNA0363 large flattened round); T the material letter; 05 the diameter code and 06 the grip code, with an optional R at the end for a part supplied without the anvil. Stem heads carry three marks: material, maker and grip. The letters S, U and T are read from the partner standards; check them on the standard.
Hole and drill by diameter code
| Standard | Code | Nominal | Body | Hole | Drill |
|---|---|---|---|---|---|
| ASNA0026 (steel / A-286) | -05 | 5/32 in (0.156 in; 3.97 mm) | 0.163 in (4.14 mm) | 0.164–0.167 in (4.16–4.24 mm†) | #19 (0.1660 in; 4.22 mm) |
| ASNA0026 (steel / A-286) | -06 | 3/16 in (0.188 in; 4.76 mm) | 0.198 in (5.03 mm) | 0.199–0.202 in (5.05–5.13 mm†) | #7 (0.2010 in; 5.11 mm) |
| ASNA0026 (steel / A-286) | -08 | 1/4 in (0.250 in; 6.35 mm) | 0.259 in (6.58 mm) | 0.260–0.263 in (6.60–6.68 mm†) | G (0.2610 in; 6.63 mm) |
| ASNA0341 (titanium) | -04 | 1/8 in (0.125 in; 3.17 mm) | 0.128 in (3.25 mm) | 0.129–0.132 in (3.28–3.35 mm†) | #30 (0.1285 in; 3.26 mm), just under the minimum: gauge the hole |
| ASNA0341 (titanium) | -05 | 5/32 in (0.156 in; 3.97 mm) | 0.163 in (4.14 mm) | 0.164–0.167 in (4.16–4.24 mm†) | #19 (0.1660 in; 4.22 mm) |
| ASNA0341 (titanium) | -06 | 3/16 in (0.188 in; 4.76 mm) | 0.198 in (5.03 mm) | 0.199–0.202 in (5.05–5.13 mm†) | #7 (0.2010 in; 5.11 mm) |
| ASNA0341 (titanium) | -08 | 1/4 in (0.250 in; 6.35 mm) | 0.259 in (6.58 mm) | 0.260–0.263 in (6.60–6.68 mm†) | G (0.2610 in; 6.63 mm) |
| Cherry CR7770S (titanium) | -10 | 5/16 in (0.312 in; 7.94 mm) | — | 0.312–0.315 in (7.92–8.00 mm) | 5/16 in (0.3125 in; 7.94 mm) |
ASNA0026 and ASNA0341 data sheets. A dagger on a value means it was printed in mm with no unit and the inch value is our conversion. The drill is the one of the site drill chart that falls inside the hole range. Countersunk head: do not deburr the hole edge; countersink up to the largest diameter in the data sheet. The -10 row is from Cherry CA-1039 p. 7, which prints the same standard hole limits for the titanium and the steel Maxibolt. The 1/64 in oversize Maxibolt takes #14 in -05, a 5.5 mm drill in -06, J in -08 and 21/64 in in -10 (CA-1039 p. 7); there is no -04 oversize. The grip table of the steel Maxibolt does not apply to the titanium Maxibolt or the Maxibolt Plus (CA-1039 p. 10): take the grip from Cherry's sheet for the exact number.
Tools and removal
| Item | What | Source |
|---|---|---|
| Pulling tools | Cherry G83, G84 or G704 | FAA-H-8083-31B p. 4-53 |
| Titanium | G-83 or equivalent pneumatic-hydraulic tool | p. 7-47 |
| Pulling heads | -MB (single-action, with washer), -MBU (without washer) | ASNA0026 data sheet |
| Removal | Blind bolts are difficult to remove because of the core bolt hardness; use the maker's removal kit | p. 4-52 |
The Cherry Maxibolt is crossed with the ASNA types on the ASNA fasteners guide.
Questions people actually ask
Why is the hole bigger than the nominal diameter?
Because the body is bigger: code 05 is 5/32 in nominal but 0.163 in at the body, and the hole is 0.164 to 0.167 in.
Steel or A-286?
Steel is 112 ksi shear and A-286 95 ksi (FAA-H-8083-31B p. 4-53); the material letter in the ASNA number says which.
Do I shave the stem?
No: the Maxibolt stem breaks flush.
Limits of this guide
What the sources support, and no further.
- Oversize Maxibolt: the Cherry Maxibolt (CR7310 and CR7311 steel, CR7620 and CR7621 CRES) has a 1/64 in oversize body, CR7340 and CR7341 in steel and CR7650 and CR7651 in CRES (flush and protruding). Its holes: -05 .180–.183 in, -06 .215–.218 in, -08 .276–.279 in, -10 .328–.331 in; there is no -04 oversize (Cherry CA-1009). No second oversize is published. The ASNA sheets print no oversize code, so the oversize part number comes from the maker's data.
- Letters S, U, A, B and T are read from partner standards and the maker's heads, not printed with a meaning in the ASNA data.
- Standard Cherry part numbers (CR) are not given: use the ASNA numbers; the oversize numbers are named above.
- Reference data, not approved data. The SRM, the drawing or the approved repair data governs over every figure here.
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Sources
- FAA-H-8083-31B, Aviation Maintenance Technician Handbook, Airframe — P. 4-53 Maxibolt blind bolt; p. 7-47 titanium Maxibolt; p. 4-52 blind bolt removal.
- ASNA0026, ASNA0027, ASNA0341, ASNA0342 and ASNA0363 standard sheets — Diameter and grip codes, body and hole.
- Cherry Aerospace CA-1039 Rev A (1-8-15) and CA-1010 Rev A (15-Jan-2007), Maxibolt catalogues — CA-1039 p. 5 fastener identification, p. 6 no MS cross-reference for the titanium Maxibolt, p. 7 hole limits and drills, p. 10 grip table; CA-1010 CR7770S Table 3 materials