Radial-Lok, Monogram
MRL3212-10-400
Hole-filling blind bolt: radial expansion fills a clearance-fit hole from one side.
- Head 100° flush tension head
- Diameter 5/16" (-10)
- Grip .350-.400"
- Material Titanium
- Lead-time risk High
Install tool MP550RL-10AA, proprietary · Variable stack? Plan grips
What the government paidlast DLA award $31.00 ea, 2024-12-09; production lead time 81 days
| Award date | Qty | Each | CAGE | PN on award |
|---|---|---|---|---|
| 2024-12-09 | 66 | $31.00 | 2N935 | MRL3212-10-400 +1 |
Median unit price by year: 2024 $31.00 ea (1 award)
- DLA lead time: production 81 days, administrative 96 days (snapshot 2026-09-16).
DLA prices at DLA quantities, not a quote.Source
DLA award prices at DLA quantities and terms, not a commercial quote. Each award may bundle packaging, delivery and inspection terms that a commercial buy does not. Vendors are shown by CAGE code only.
Joined through the NSN that DLA FLIS records for this part number. A part number on an award is the one cited on that award line; the same NSN can be bought under several part numbers. Awards loaded: 2023-01-03 to 2026-09-15.
Source: DLA FOIA Electronic Reading Room ↗, public FOIA releases. Files:
- 2023ContHist.zip/2023ContractHistory.txt (Contract History, snapshot 2024-06-24)
- 2024ContHist.zip/2024ContractHistory.txt (Contract History, snapshot 2025-08-07)
- contracthist2025.zip/contracthist2025.txt (Contract History, snapshot 2026-04-07)
- 2026-09-16-1038_contracthist.zip/2026-09-16-1038_contracthist.txt (Contract History, snapshot 2026-09-16)
- 2026-09-16-1038_ALTPLT.zip/2026-09-16-1038_ALTPLT.txt (ALT/PLT lead times, snapshot 2026-09-16)
- 2026-09-16-1038_OHandBO.zip/2026-09-16-1038_OHandBO_SEP2026.txt (On hand and backorder, snapshot 2026-09-16)
Compiled 2026-10-02.
| Family | Radial-Lok (Monogram) |
|---|---|
| Head style | 100° flush tension head (source: Monogram drawing MRL3212 Rev AD, title block) |
| Nominal diameter | 5/16" (-10) |
| Grip | grip range 0.350-0.400" (drawing Table II) |
| Material | Titanium. Nut: 6Al-4V titanium alloy; screw: Inconel 718; sleeve: 304 stainless steel; expansion sleeve: A286 |
Decoded from the published numbering scheme; not a claim that this exact dash number is a stocked SKU, and not a certified design authority. Always verify against the controlling drawing, spec, and your stress group.
Series and strength (datasheet)
MRL3210 (low profile protruding head) / MRL3212 (100° flush tension head) · e.g. MRL3212-06-500
Rated shear 75 KSI; 3/16" double shear 4,800 lb min, tensile 1,600 lb min; "up to .006" via unique radial expansion": Monogram catalog comparison chart.
Datasheet (PDF) ↗MRL3212 grip chart: 5/16" (-10)
Every catalogued max-grip dash number at this diameter. Stack thickness must fall inside the fastener's grip range: see the design calculators.
Other diameters at this grip:
Expanding sleeve · 3 steps
1/3Inserted, tool placed
“The Radial-Lok fastener is first inserted into the prepared clearance fit hole. The installation tool is placed over the screw, simultaneously engaging the wrench flats and the DRIVE NUT.”
Monogram Radial-Lok brochure, p.2, Installation Sequence ↗
Drawing traced from: Panel 1.
Install tooling
Install tooling: MP550RL-10AA (Monogram MRL1003 (Radial-Lok install spec), p.6, Table 1) · proprietary
- MGFRL-10 Flush head barrel gage (break-off check)
Decode details
| Series | Radial-Lok (Monogram) |
|---|---|
| Decode confidence | high |
| Numbering source | Monogram drawing MRL3212 |
- MRL3210 and MRL3212 use different grip conventions (see each drawing's grip table); other MRL bases are not decoded.
Government reference cross-reference (DLA FLIS)
Government reference cross-reference (DLA FLIS)
Reference numbers the Federal Logistics Information System records against the same National Stock Number. A supply-catalog cross-reference, not an engineering-approved interchangeability: confirm against the controlling drawing or spec before substituting.
MRL3212-10-400 is listed under NSN 5320-01-648-2857 RIVET,BLIND
| Reference number | CAGE | FLIS reference type |
|---|---|---|
| 3M1243-10-400 | 76301 | Secondary reference |
Source: DLA Federal Logistics Information System, via DLA PUB LOG ↗ (FLIS Data Electronic Reading Room ↗). FLIS data as of 2025-03-18 (March 2025 snapshot).
- Radial-Lok by Monogram, blind bolt
- Datasheet (PDF) ↗
- Manufacturer page ↗
- Numbering: Monogram drawing MRL3212 ↗
Lead-time risk for this family (SpecLok sourcing assessment): High
Supply signal
Supply signalfor this part number
- 3 CAGE codes with a part number recorded on NSN 5320-01-648-2857 (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 2026-10-02.
Image credits: Monogram Aerospace Fasteners, Radial-Lok® product page (pennaero.com) ↗. Product images belong to their manufacturers.
Sources
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