Self-locking nutplates (MS21047, MS21059, MS21069, MS21078; rivetless ForceTec), generic-NAS
MS21047L7
The captive nut behind a panel: MS/NASM self-locking plate nuts, riveted, plus the rivetless ForceTec.
- Style NUT, SELF-LOCKING, PLATE, TWO-LUG, LOW HEIGHT, STEEL, 125 KSI Ftu, 450°F
- Thread size .4375-20 UNJF-3B (dash -7)
- Rivet holes Plain rivet holes
- Material Steel, cadmium plated
- Lead-time risk Medium
| Family | Self-locking nutplates (MS21047, MS21059, MS21069, MS21078; rivetless ForceTec) (generic-NAS) |
|---|---|
| Style | NUT, SELF-LOCKING, PLATE, TWO-LUG, LOW HEIGHT, STEEL, 125 KSI Ftu, 450°F (source: MS21047 title block) |
| Thread size | .4375-20 UNJF-3B (dash -7) |
| Rivet holes | Plain rivet holes |
| Material | Steel, cadmium plated |
Decoded from the published numbering scheme; not a claim that this exact part number is a stocked SKU, and not a certified design authority. Always verify against the controlling drawing and spec.
Series and loads (datasheet)
MS21047[-|L][dash][K] · e.g. MS21047L4K (.250-28, dry film lubricant, countersunk or dimpled rivet holes) · NASM21047 same PIN
MIL-DTL-25027H Table V torque out, in-lb min: .112 20, .138 30, .164 45, .190 60, .250 100, .312 160, .375 240; Table VI push out, lb: .112 40, .138 60, .164 80, .190 100, ".250 and over" 125; Table III max locking / min breakaway, in-lb: .190-32 18 / 2.0, .250-28 30 / 3.5 (p.22-23). MS21047F Table I axial strength, lbs min: .190-32 2,460; .3125-24 7,390; .375-24 11,450. MS21047 "NUTS ARE DESIGNED TO DEVELOP THE TENSILE STRENGTH OF BOLTS AND SCREWS WITH AN ULTIMATE TENSILE STRENGTH OF 125 KSI" (Note 4).
Other MS21047 part numbers
No install diagram: no public-domain figure of a nutplate being installed was found. The FAA handbook's nutplate figures credit Cherry Aerospace and other contributors, and no FTI document names the ForceTec patent. The MS21047 drawing and AC 43.13-1B part views are under source images.
ForceTec (rivetless) install steps, in FTI's words (not drawn). No riveted-nutplate install procedure was found in the documents read.
- “Slide the split sleeve onto the mandrel” FTI ForceTec brochure, p.4, ForceTec Installation Procedure ↗
- “Insert the retainer into the starting hole from either side” FTI ForceTec brochure, p.4, ForceTec Installation Procedure ↗
- “Insert the mandrel/sleeve assembly through the retainer” FTI ForceTec brochure, p.4, ForceTec Installation Procedure ↗
- “Activate the hydraulic puller unit” FTI ForceTec brochure, p.4, ForceTec Installation Procedure ↗
- “Retract the mandrel all the way through the sleeve and retainer” FTI ForceTec brochure, p.4, ForceTec Installation Procedure ↗
- “Remove the split sleeve and insert the nut element” FTI ForceTec brochure, p.4, ForceTec Installation Procedure ↗
Source images (4): patent and government drawings
A patent drawing shows the patented design, which can differ in detail from today's catalog part. Each image says why it is tied to this family.
Install tooling: Riveted: nutplate drill (two holes at once) and rivets per the design; rivetless ForceTec: FTI mandrel, split sleeve and puller
Decode details
| Series | MS21047 self-locking plate nut |
|---|---|
| Decode confidence | high |
| Numbering source | MS21047 Table I and part number requirement |
- "THE PART NUMBER SHALL CONSIST OF THE BASIC MS NUMBER FOLLOWED BY A DASH NUMBER FROM TABLE I"; Table I columns: plain rivet holes or countersunk or dimpled rivet holes, each non-dry film or dry film lubricant (MS21047F Requirement 10).
- Dry film lubricant (L).
- Axial strength 15,450 lbs min (MS21047F Table I).
- MS21047F (1 Feb 94) "is hereby canceled and superseded by NASM21047. The Part Identification Number (PIN) for MS21047F and the part number for NASM21047 are identical." (Notice 1, 9 Sep 1999)
Lead-time risk for this family (SpecLok sourcing assessment): Medium
Image credits: PCC Fasteners, Anchor Nuts product page ↗. Product images belong to their manufacturers.
Sources
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