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NAS1791 nutplate — two lug, self-locking, floating, variable counterbore

Nutplate, Two Lug, Self-Locking, Floating, Variable Counterbore: dimensions by thread size and every listed part number.

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NAS1791 at a glance

Where to buy
NAS1791, nutplate, two lug, self-locking, floating, variable counterbore
NAS1791
NAS1791 engineering drawing with dimensions
Engineering drawing · dimensions in inches

Specification

ItemValue
TypeNutplate, two lug, self-locking, floating, variable counterbore
StatusCheck the current issue before design use.

Dimensions by size

Dimension, in10-321/4-28
A — Overall length, max.9481.292
B — Overall width, max.445.547
C — Rivet-hole dimension, max ±.005 (see drawing).344.500
H — See drawing, max.484.584
J — Rivet spacing, max ±.002 (see drawing).6881.00
Thread10-321/4-28

Dimensions as tabulated in the catalogue; every value is a maximum unless marked.

Part numbers

Every part number listed, by thread size.

10-328 part numbers

Part no.Height, max
NAS1791A3-1.640
NAS1791C3-1.640
NAS1791A3-2.640
NAS1791C3-2.640
NAS1791A3-3.755
NAS1791C3-3.755
NAS1791A3-4.823
NAS1791C3-4.823

1/4-288 part numbers

Part no.Height, max
NAS1791A4-1.640
NAS1791C4-1.640
NAS1791A4-2.640
NAS1791C4-2.640
NAS1791A4-3.755
NAS1791C4-3.755
NAS1791A4-4.823
NAS1791C4-4.823

Part number

How a NAS1791 part number is built, segment by segment

What each code means

PartMeaning
ExampleNAS1791A3-1 — 10-32 thread, height .640, prefix A

Notes from the standard

  • Replaceable nut element, 125 ksi, 450 °F and 800 °F (as printed in the catalogue heading).
  • The catalogue prints two part-number columns under the standard number (prefix A and prefix C) and does not say what separates them; the standard defines the difference.
  • The first two heights of each diameter are both .640 in the catalogue; the standard separates them.
  • Approved data governs. Use the nutplate the drawing, SRM or IPC calls for.

Where to buy

AmericaDistributor coming soonOur partner for this region is on its way
EuropeDistributor coming soonOur partner for this region is on its way
OceaniaDistributor coming soonOur partner for this region is on its way

Distributors coming soon.

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Calculators

CalculatorTorque by Part Number: Bolt and NutTorque for an AN or NAS bolt with its nut, from AC 43.13-1B Table 7-1CalculatorTorque Wrench Extension CalculatorTorque wrench setting with a crowfoot or adapterCalculatorAviation Unit ConverterConvert the units a hangar mixesCalculatorPart number cross-referenceType any NAS1791 number and see its other names.

Guides

ChartAN Bolt & Nut Torque ChartRecommended torque for AN and MS nuts and bolts in inch-pounds, fine and coarse thread, plus…ChartFastener cross-referenceFrequent fastener crosses with their supersession status

How to do it

Standard practiceTorquingHow to torque aircraft bolts

Tools

Tool guideTorque wrenchHow to use an aircraft torque wrenchBuying guideTorque Wrenches: Click, Dial or Beam, and What RangeWhich torque wrench for AN hardware

Data sheets

Data sheetNutsThe family side by side.Data sheetWashersAircraft washers side by sideData sheetAN bolts, AN3 to AN8AN3 to AN8 aircraft bolts side by sideData sheetTekton TRQ — micrometer click torque wrenches, 1/4 to 1/2 in driveTekton TRQ Tekton micrometer torque wrenches

Buy

Distributors coming soon.

Sources

  • NAS1791 — Nutplate, Two Lug, Self-Locking, Floating, Variable Counterbore — nominal sizes and part numbers.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.
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