Name: CherryLOCK
Brand: Cherry

Blind (one-sided), pulled-stem blind rivet: “Stem is pulled into rivet sleeve and starts to form bulbed blind head.” (Cherry CA-1005 (CherryLOCK), p.3, Installation Sequence)

Shear: 30-95 ksi
Blind bulb: large
Install: One-side install
Diameters: 1/8, 5/32, 3/16, 1/4"
Lead-time risk (SpecLok assessment): Low

Typical applications

·Blind structural joints in metal (CA-1005)

Strengths

+Bulbed: "strength and performance in both thick and thin sheets" (CA-1005)
+"No shaving, even in thin sheet applications"; "self-inspecting (per NAS requirements)" (CA-1005)

Trade-offs

−Specific pulling heads and hydroshift riveters (CA-1005 tooling notes)
−No composite rating in CA-1005

Also called Cherry Lock, Bulbed CherryLOCK. P/N: CR2xxx · e.g. CR2249-5-04 (= NAS1738B)

Dimensions

Dimensions as printed, inches
Dia.	Sleeve shank diameter	.201+.003 -.001
A	Head diameter	.375±.010
B	Head height	.080+.010 -.000
Z	Stem length above the head, as supplied	1.65(REF)
Grip limits	Dash 6-04	.188-.250
L	Under the head to end of sleeve	.469

All dimensions (9)

BK (Aluminum)	Min blind clearance for satisfactory installation	.37
BK (Monel & Inconel)	Min blind clearance for satisfactory installation	.41
K	Under the head to blind end of stem	.64

As printed on CA-1005 p.8 ↗. Letters match the drawing.

Printed in CA-1005 for CR2239-6-04

Materials CR2239 (NAS1738E)

Sleeve 5056 QQ-A-430 (MIL-C-5541); stem INCONEL 600 AMS 5665 (NONE); lock ring MONEL QQ-N-281 (NONE) (CA-1005 p.8)

Datasheet strength: Bulbed: 50,000 psi (5056 aluminum sleeve) to 75,000 psi (Monel, Inconel 600 sleeve); wiredraw: 30,000 / 38,000 psi (aluminum) to 95,000 psi (A-286, CR2642/2643): Cherry CA-1005.

Standards

NAS1738
NAS1739
NAS1398
NAS1399

Materials and galvanic compatibility vs CFRP

Alloy	Shear	vs CFRP	Notes	Source
Aluminum	50 ksi	high	Bulbed: 5056 sleeve (NAS1738B/E, CR2249/2239); 250°F max	CA-1005 bulbed materials table: 50,000 psi
Monel	75 ksi	low	Bulbed: Monel sleeve (NAS1738M); 900°F max	CA-1005 bulbed: 75,000 psi
Inconel	75 ksi	low	Bulbed: Inconel 600 sleeve (NAS1738C); 1400°F max	CA-1005 bulbed: 75,000 psi
Aluminum	30 ksi	high	Wiredraw: 5056 sleeve (NAS1398B)	CA-1005 wiredraw: 30,000 psi
A286 CRES	95 ksi	low	Wiredraw CR2643/2653: for high-strength materials only, not aluminum structure	CA-1005 wiredraw: 95,000 psi (note ††)

vs CFRP: MIL-STD-889C Table I, graphite column: high = incompatible in all environments; low = compatible except sea-water immersion; unrated = SpecLok has not read a rating for this material.About derived ksi

Derived ksi values are min shear ÷ nominal shank area, computed from the datasheet's lbf/kN figures; the datasheet itself publishes no ksi.

Specs source: Cherry CA-1005 (CherryLOCK catalog) ↗: Bulbed (NAS1738/NAS1739) and wiredraw (NAS1398/NAS1399) materials and strength tables; bulbed rivets are 1/64" oversize, -4 to -6. Lead-time risk is SpecLok's sourcing assessment, not a datasheet value.

To scale from Cherry CA-1005 ↗ p.8 (PDF page 10).Drawing notes

Drawn to scale from the printed values in Cherry CA-1005 p.8 (PDF page 10) (nas1738 universal head), Rev. A, Date: March 12, 2007, DCR 07-0143. Letters are the catalog's. Manufacturer nominal: printed values, the mean where only two limits are printed. L is drawn at its printed (max) value, K at its max. Crown drawn as a circular arc through A and B; the catalog dimensions no crown radius. Stem details and locking parts are not dimensioned in CA-1005 and are not drawn.

Model

Envelope model, not manufacturer CAD. Download STEP or STL from the part panel at the top.Model details

CR2239-6-04, manufacturer nominal. Simplified envelope model from Cherry CA-1005 p.8 printed dimensions. Manufacturer nominal: printed values, the mean where only two limits are printed. Flush heads hold the printed head angle; the head depth is derived. Not manufacturer CAD. Verify against the current catalog before use. Separate solids for the sleeve and the stem envelope. Axis +Z, head up, z = 0 at the face the head bears on. STEP (AP214) is in inches; STL has no units and is written in millimetres.

Source

CR2239: sleeve 5056 QQ-A-430 (MIL-C-5541); stem INCONEL 600 AMS 5665. CA-1005 p.8.
Every head style, rivet number, diameter and grip on the transcribed standards pages. The 3D view, the drawing and the STEP / STL download are all built from the printed dimension letters; nothing the catalog does not dimension is modelled.

CA-1005 p.8-8, manufacturer printed values.

7 head styles

Not redrawn: no head dimensions for this variant in the documents on file. The data at right is from the cited document.

Universal head (MS20470)

CR2249 Bulbed CherryLOCK · NAS1738B: 5056 aluminum sleeve, alloy steel stem (cad. plt'd)-4, -5, -6 (sleeve 1/64" over nominal).
CR2239 Bulbed CherryLOCK · NAS1738E: 5056 aluminum sleeve, Inconel 600 stem
CR2539 Bulbed CherryLOCK · NAS1738M: Monel sleeve, Inconel 600 stem (CR2539P: Monel, cad. plt'd = NAS1738MW)
CR2839 Bulbed CherryLOCK · NAS1738C: Inconel 600 sleeve, A-286 CRES stem (CR2839CW: cad. plt'd = NAS1738CW)

Head-specific tooling

H681-( )C H681 pulling head, Universal Head / Countersunk Head (NASM20426): "It is acceptable that countersunk (C) pulling heads be used for installing both universal and countersunk head CherryLOCK rivets" (Cherry CA-1013 (CherryLOCK process manual), p.9 H681 pulling heads ↗)
H690-( )U H690 pulling head, Universal Head (G695B right angle) (Cherry CA-1013 (CherryLOCK process manual), p.11 G695B / H690 ↗)

Source: Cherry CA-1005 (CherryLOCK), p.7 conversion table; p.8 NAS1738 universal head ↗

Head styles (manufacturer terms)

Universal head (MS20470) (CR2249, CR2239, CR2539, CR2839)
Countersunk head (MS20426) (CR2248, CR2238, CR2538, CR2838)
Unisink head (CR2235, CR2245, CR2545, CR2845)
156° countersunk head (CR2540, CR2840)
Universal head (MS20470) (CR2263, CR2163, CR2663, CR2563, CR2653, CR2643)
Countersunk head (MS20426) (CR2262, CR2162, CR2662, CR2562, CR2652, CR2642)
Countersunk head (NAS1097) (CR2164, CR2564, CR2664)

Pulled stem / bulbing · 6 steps

1/6Inserted, sheet gap

“Before pulling begins.”

Cherry CA-1005 (CherryLOCK), p.3, Installation Sequence ↗

Drawing traced from: Panel 1.

Key (how to read these diagrams)

Manufacturer figure: Cherry CA-1005 (CherryLOCK), p.3, Bulbed CherryLOCK Installation Sequence, panels 1-6 ↗CA-1005 notes for panel 5: “In minimum grip shear ring may not shear”. Panel 6 is drawn at “maximum grip illustrated”.Schematic cross-section at the source figure's proportions, not to scale. Terms are the document's own.

Compare every family's mechanism

Official manufacturer install demonstration: CherryLOCK installation.

Installation verification and preload

Installed preload

Not published. CA-1005 and CA-1013 say only "high stem break load provides high preload"; no number anywhere.

What to check after install

Installed flushness inspected to the break-off limits of NAS1400 / NAS1740.
Stem and collar protrusion, per diameter (stem-above-collar / collar-above-head max): -3: .015"/.010"; -4: .015"/.010"; -5: .020"/.010"; -6: .025"/.015"; -8: .030"/.020". Slight collar flash acceptable.
Self-inspecting: if stem and collar are within flushness limits, blind-head inspection is unnecessary (CA-1013).
Grip length marked on the rivet head serves as visible-side grip verification (most diameters).

Check gauges (3) and sources.Details

269C3 grip selector gage.
T172 GO/NO-GO hole gages (T172-3 through -8; -400/-500/-600 for bulbed).
P913/P856/P857/P858/P859 anvil GO/NO-GO gages for lock-ring anvil wear (tool maintenance).

Sources: CA-1005 catalog · CA-1013 process manual. Acceptance limits belong to the controlling spec; verify against your program's process documentation.

Print a shop verification card for the floor

Tool: Cherry hydroshift riveters with pulling heads (CA-1005 tooling section)
Special / proprietary: Special tooling · proprietary
Training: Not stated in the cited documents.
Inspection: Stem and collar flushness per NAS1400 / NAS1740 (see verification below).

CA-1005 tooling notes call out specific pulling heads per rivet (e.g. "requires H681B166-( ) series pulling head"); adapters and anvil gages are listed for "all Cherry Aerospace hydroshift riveters".

The published install tool and nose for each size, other access options, and the gauges that check the install, from the manufacturer's own tool tables.

Dia.	Published tool + nose	Other access	Gauges
-4	G700 + H681	Right angle	269C3, T172-4 / T172-400 (bulbed), P856, 680A159
-5	G784 + H681	Right angle	269C3, T172-5 / T172-500 (bulbed), P857, 680A159
-6	G784 + H681	None published	269C3, T172-6 / T172-600 (bulbed), P858, 680A159
-8	Not in the published table for this size	None published	269C3, T172-8, P859, 680A159

Full tool tables, envelopes, clearances and source notes Compare tooling burden across all 25 families

Cherry CA-1013 (CherryLOCK process manual), Rivet Removal

“In thick material remove the lock by driving out the rivet stem, using a pin punch.” Cherry CA-1013 (CherryLOCK process manual), p.22, Rivet Removal ↗
“If the rivets have been installed in thin sheets, driving out the locked stem may damage the sheets. It is recommended that the stem be center punched first and a small center drill be used to provide a guide for a larger drill on top of the rivet stem. The larger drill can then be used to drill away the lock. Finally, use a pin punch to drive out the stem.” Cherry CA-1013 (CherryLOCK process manual), p.22, Rivet Removal ↗
“Drill nearly through the head of the rivet, using a drill the same size as the rivet shank. Do not drill completely through rivet head.” Cherry CA-1013 (CherryLOCK process manual), p.22, Rivet Removal ↗
“Break off rivet head, using a pin punch as a pry.” Cherry CA-1013 (CherryLOCK process manual), p.22, Rivet Removal ↗
“Drive out the remaining rivet shank with a pin punch having a diameter equal to the rivet shank.” Cherry CA-1013 (CherryLOCK process manual), p.22, Rivet Removal ↗

Cautions

“CAUTION: Never drill completely through the rivet sleeve to remove a rivet as this will tend to enlarge the hole.” Cherry CA-1013 (CherryLOCK process manual), p.22, Rivet Removal ↗

None of the removal procedures on file gives a composite-specific removal caution. The Monogram specs address composite at the hole instead: holes "reasonably round and free from burrs (metallic structure) and delamination (graphite/epoxy type structure)" (MBF2003 §5.1).

Step through it on the diagram (Removal view) →

CR2239
Diameters 1/8", 5/32", 3/16" · 12 grip lengths
Every dash number Plan grips for your stack
CR2249
Diameters 1/8", 5/32", 3/16" · 12 grip lengths
Every dash number Plan grips for your stack
CR2539
Diameters 1/8", 5/32", 3/16" · 12 grip lengths
Every dash number Plan grips for your stack
CR2839
Diameters 1/8", 5/32", 3/16" · 12 grip lengths
Every dash number Plan grips for your stack

Manufacturer: Cherry
Category: Blind rivet

Datasheet (PDF) ↗
Manufacturer page ↗
Cherry CA-1005 (CherryLOCK catalog) ↗: Bulbed (NAS1738/NAS1739) and wiredraw (NAS1398/NAS1399) materials and strength tables; bulbed rivets are 1/64" oversize, -4 to -6.
CA-1005 ↗ CA-1005, Rev. A, Date: March 12, 2007, DCR 07-0143

Find the part number for your stack

DiameterStack thickness, in

Enter your stack thickness and diameter to get the CR2239 dash number.

Dash numbers and grips: Cherry CA-1005 p.8, nas1738 universal head ↗

QtyInclude install tooling

Sourcing

Lead-time risk (SpecLok sourcing assessment): Low

Get quotes: SpecLok sources this from authorized distributors and returns price, lead time and certs.You buy from the authorized distributor, who is named on your returned quote. SpecLok is free for buyers.

Supply signalfor this family

813 NSNs carry a part number of this family, recorded by 37 CAGE codes (FLIS, March 2025).
Last DoD award for RIVET,BLIND items (FSC 5320): 2026-06-26; 3,082 awards since 2025-10-01.
No SpecLok quotes yet.

A signal from records SpecLok holds, not availability, stock or a lead-time promise. FLIS lists who has recorded a part number for the item, not who makes it today. DoD awards carry no NSN or part number, so award activity is for the item name's class.

Sources: DLA FLIS Data Electronic Reading Room (PUB LOG) ↗, DLA PUB LOG ↗, USAspending.gov award search API ↗; DoD award data 2025-10-01 to 2026-07-06; compiled 2026-09-28.