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NAS1581 — 100° flush reduced head, offset cruciform recess

Bolt, 100° Flush Reduced Head, Offset Cruciform Recess: thread, grip, length and commonly stocked part numbers. Head and shank dimensions come from the standard itself.

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NAS1581 at a glance

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NAS1581, bolt, 100° flush reduced head, offset cruciform recess
NAS1581
NAS1581 engineering drawing with dimensions
Engineering drawing · dimensions in inches

Specification

ItemValue
Type100° flush reduced head bolt
MaterialF: alloy steel; C: A-286 corrosion-resistant steel
StatusCheck the current issue before design use.

Dimensions by size

Dimension, in10-32
Thread10-32

Thread as stated for the standard. Head and shank dimensions are not shown here: take them from the standard.

Part numbers

Part numbers commonly stocked, with grip and length. The standard governs and may list others.

10-3229 part numbers

Part no.Grip, inLength, in
NAS1581F3T2.125.487
NAS1581C3T2.125.487
NAS1581C3T2P.125.487
NAS1581F3T3.187.549
NAS1581C3T3.187.549
NAS1581C3T3P.187.549
NAS1581F3T4.250.613
NAS1581C3T4.250.613
NAS1581C3T4P.250.613
NAS1581F3T5.312.675
NAS1581C3T5.312.675
NAS1581C3T5P.312.675
NAS1581F3T6.375.738
NAS1581C3T6.375.738
NAS1581C3T6P.375.738
NAS1581F3T7.438.801
NAS1581C3T7.438.801
NAS1581F3T8.500.863
NAS1581C3T8.500.863
NAS1581F3T9.562.925
NAS1581C3T9.562.925
NAS1581F3T10.625.988
NAS1581C3T10.625.988
NAS1581F3T11.6881.051
NAS1581C3T11.6881.051
NAS1581F3T12.7501.113
NAS1581C3T12.7501.113
NAS1581F3T14.8751.238
NAS1581C3T14.8751.238

Part number

What each code means

PartMeaning
FMaterial: Alloy steel
CMaterial: A-286 corrosion-resistant steel
PMaterial: Suffix P: cadmium plating, Type II Class 2
ExampleNAS1581F3T2 — 100° flush reduced head bolt, grip .125, length .487

Notes from the standard

  • Grip tolerance ±.010.
  • Offset cruciform recess per MS14191.
  • Part number format as commonly written; check the standard for the exact format.
  • Approved data governs. Use the bolt the SRM, drawing 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

CalculatorBolt Grip Length & Washer CalculatorCheck a bolt's grip length against the parts it holds and the washers needed to make it up…CalculatorAN Bolt Hole Drill SizeDrill for an AN bolt holeCalculatorTorque by Part Number: Bolt and NutTorque for an AN or NAS bolt with its nut, from AC 43.13-1B Table 7-1CalculatorPart number cross-referenceType any NAS1581 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

Data sheets

Data sheetAN bolts, AN3 to AN8AN3 to AN8 aircraft bolts side by sideData sheetStructural boltsThe family side by side.Data sheetNAS1580Bolt, 100° Flush Head, Offset Cruciform RecessData sheetNAS1993Bolt, 100° Reduced Head, Torq-Set Recess

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Distributors coming soon.

Sources

  • NAS1581 — Bolt, 100° Flush Reduced Head, Offset Cruciform Recess — 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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