AS3085
SAE Aerospace StandardAS3085 is an SAE Aerospace Standard for a preformed O-ring seal to AMS7280. SAE has stabilised it: the document is no longer revised, but it has not been cancelled.
- Official title
- PACKING, PREFORMED - AMS7280, 'O' RING
Reference
Aircraft hardware standards: AN, MS, NAS, AS and EN
What the standard number on an O-ring, washer, screw or rivet actually specifies.
A hardware part number usually starts with the standard that defines the part: MS24665 is a cotter pin, NAS1149 a flat washer, AS3209 an O-ring. Below, each standard we list parts against is explained in one sentence, with its official title and the page we checked it on. Where the issuing body has replaced a standard, the successor is named.
Each entry was read from the issuing body, EverySpec's copy of the US Department of Defense document, or an Aerospace Industries Association NAS mailing. Standards whose titles could not be confirmed on a page we could fetch are left out rather than guessed.
O-rings, packings and backup rings
AS3208
SAE Aerospace StandardAS3208 is an SAE Aerospace Standard for a preformed O-ring seal to AMS 7276. SAE has stabilised it: the document is no longer revised, but it has not been cancelled.
- Official title
- PACKING, PREFORMED - AMS 7276 - SEAL
AS3209
SAE Aerospace StandardAS3209 is an SAE Aerospace Standard for a preformed O-ring seal to AMS 7276. SAE has stabilised it: the document is no longer revised, but it has not been cancelled.
- Official title
- PACKING, PREFORMED - AMS 7276, 'O' RING
AS3582
SAE Aerospace StandardAS3582 is an SAE Aerospace Standard for a preformed O-ring seal to AMS3304.
- Official title
- PACKING, PREFORMED – O-RING SEAL AMS3304
M25988/1
US military specification sheetM25988/1 is a US military specification sheet (MIL-R-25988) for an oil- and fuel-resistant fluorosilicone-rubber O-ring, class 1, grade 70.
- Official title
- RUBBER, FLUOROSILICONE ELASTOMER, OIL- AND FUEL RESISTANT, O-RINGS, CLASS 1, GRADE 70
M83248/1
US military specification sheetM83248/1 is a US military specification sheet (MIL-R-83248) for a fluorocarbon-rubber O-ring, class 1, 75 hardness. It has been cancelled; the cancellation notice refers O-ring users to SAE AS3209 and AMS 7276.
- Official title
- RUBBER, FLUOROCARBON ELASTOMER, HIGH TEMPERATURE, FLUID AND COMPRESSION SET RESISTANT (O-RINGS, CLASS 1, 75 HARDNESS)
M83248/2
US military specification sheetM83248/2 is a US military specification sheet (MIL-R-83248) for a fluorocarbon-rubber O-ring, class 2, 90 hardness.
- Official title
- RUBBER, FLUOROCARBON ELASTOMER, HIGH TEMPERATURE, FLUID AND COMPRESSION SET RESISTANT (O-RINGS, CLASS 2, 90 HARDNESS)
M83461/1
US military specification sheetM83461/1 is a US military specification sheet (MIL-P-83461) for a preformed O-ring resistant to petroleum hydraulic fluid. It has been superseded by SAE AS83461/1.
- Official title
- PACKING, PREFORMED, PETROLEUM HYDRAULIC FLUID RESISTANT IMPROVED PERFORMANCE AT 275 DEGREE F (135 DEGREE C) SIZES AND TOLERANCES
M83461/2
US military specification sheetM83461/2 is a US military specification sheet (MIL-P-83461) for a preformed packing for straight-thread tube-fitting bosses, resistant to petroleum hydraulic fluid. It has been superseded by SAE AS83461/2.
- Official title
- PACKING, PREFORMED, PETROLEUM HYDRAULIC FLUID RESISTANT IMPROVED PERFORMANCE AT 275 DEG. F (135 DEG. C) FOR USE IN BOSS FITTINGS, SIZES AND TOLERANCES
MS28774
US military standard (MS)MS28774 is a US military standard for a single-turn PTFE backup ring used with O-rings.
- Official title
- RETAINER, PACKING BACKUP, SINGLE TURN, POLYTETRAFLUOROETHYLENE
MS28775
US military standard (MS)MS28775 is a US military standard for a hydraulic O-ring rated to +275 °F. It has been superseded by SAE AS28775, with the same part numbers.
- Official title
- PACKING, PREFORMED, HYDRAULIC, +275 DEG. F ("O" RING)
MS28778
US military standard (MS)MS28778 is a US military standard for a O-ring that seals straight-thread tube fittings into their ports. It has been superseded by SAE AS28778.
- Official title
- PACKING, PREFORMED, STRAIGHT THREAD TUBE FITTING BOSS
MS29512
US military standard (MS)MS29512 is a US military standard for a hydrocarbon-fuel-resistant O-ring for tube fittings. It has been superseded by SAE AS29512.
- Official title
- PACKING, PREFORMED, HYDROCARBON FUEL RESISTANT, TUBE FITTING, "O" RING
MS29513
US military standard (MS)MS29513 is a US military standard for a hydrocarbon-fuel-resistant O-ring. It has been superseded by SAE AS29513.
- Official title
- PACKING, PREFORMED, HYDROCARBON FUEL RESISTANT, "O" RING
MS29561
US military standard (MS)MS29561 is a US military standard for a synthetic-lubricant-resistant O-ring. It has been superseded by SAE AS29561.
- Official title
- PACKING, PREFORMED, O RING, SYNTHETIC LUBRICANT RESISTANT
Washers
AN960
Air Force–Navy aeronautical standardAN960 is an Air Force–Navy aeronautical standard for a flat washer. It has been superseded by NAS1149.
- Official title
- WASHER FLAT
MS35338
US military standard (MS)MS35338 is a US military standard for a split (helical spring) lock washer, regular/medium series. It has been superseded by NASM35338.
- Official title
- WASHER, LOCK-SPRING, HELICAL, REGULAR (MEDIUM) SERIES
NAS1149
NAS · Aerospace Industries AssociationNAS1149 is a National Aerospace Standard (published by the Aerospace Industries Association) for a flat washer (the named replacement for AN960).
- Official title
- WASHER, FLAT
Screws
MS24693
US military standard (MS)MS24693 is a US military standard for a 100° flat countersunk cross-recessed machine screw, coarse and fine inch threads. It has been superseded by NASM24693.
- Official title
- SCREW, MACHINE, FLAT COUNTERSUNK HEAD, 100 DEG., CROSS RECESSED, UNC-2A AND UNF-2A
MS24694
US military standard (MS)MS24694 is a US military standard for a structural 100° flat countersunk cross-recessed machine screw. It has been superseded by NASM24694, with the same part numbers.
- Official title
- SCREW, MACHINE, FLAT COUNTERSUNK HEAD, 100 DEG., STRUCTURAL, CROSS RECESSED, UNC-3A AND UNF-3A
MS27039
US military standard (MS)MS27039 is a US military standard for a structural pan-head cross-recessed machine screw. It has been superseded by NASM27039.
- Official title
- SCREW, MACHINE - PAN HEAD, STRUCTURAL, CROSS RECESSED
MS35206
US military standard (MS)MS35206 is a US military standard for a pan-head cross-recessed machine screw, cadmium-plated carbon steel, coarse inch thread. It has been superseded by NASM35206.
- Official title
- SCREW, MACHINE-PAN HEAD, CROSS-RECESSED CARBON STEEL, CADMIUM PLATED, UNC-2A
NAS514
NAS · Aerospace Industries AssociationNAS514 is a National Aerospace Standard (published by the Aerospace Industries Association) for a 100° flat-head fully threaded machine screw, alloy steel.
- Official title
- SCREW, MACHINE, 100 DEG. FLAT HEAD, FULL THREADED, ALLOY STEEL
NAS517
NAS · Aerospace Industries AssociationNAS517 is a National Aerospace Standard (published by the Aerospace Industries Association) for a close-tolerance 100° flush-head alloy-steel shear screw with a cross recess, 95 ksi shear.
- Official title
- SCREW, SHEAR, 100° FLUSH HEAD, ALLOY STEEL, CROSS RECESS, CLOSE TOLERANCE, 95 KSI Fsu
Bolts
NAS1580
NAS · Aerospace Industries AssociationNAS1580 is a National Aerospace Standard (published by the Aerospace Industries Association) for a 100° flush-head shear bolt with offset-cruciform recess, 95 ksi shear.
- Official title
- BOLT, SHEAR, 100° FLUSH HEAD, OFFSET CRUCIFORM, OFFSET CRUCIFORM – RIBBED AND DOVETAIL SLOT, 95 KSI Fsu
NAS6205
NAS · Aerospace Industries AssociationNAS6205 is a National Aerospace Standard (published by the Aerospace Industries Association) for a close-tolerance hex-head alloy-steel tension bolt, 160 ksi tensile (5/16 in size of the NAS6203–NAS6220 family).
- Official title
- BOLT, TENSION, HEX HEAD, CLOSE TOLERANCE, ALLOY STEEL, SHORT THREAD, REDUCED MAJOR THREAD DIA., SELF-LOCKING AND NONLOCKING, 160 KSI Ftu
NAS6604
NAS · Aerospace Industries AssociationNAS6604 is a National Aerospace Standard (published by the Aerospace Industries Association) for a close-tolerance hex-head tension bolt (NAS6603-NAS6620 family, 1/4-28 size).
- Official title
- BOLT, TENSION, HEX HEAD, CLOSE TOLERANCE, ALLOY STEEL, LONG THREAD, REDUCED MAJOR DIA., SELF-LOCKING AND NONLOCKING, 160 KSI Ftu
Nuts
MS17825
US military standard (MS)MS17825 is a US military standard for a castellated hex self-locking nut with non-metallic insert, 250 °F.
- Official title
- NUT, SELF-LOCKING, CASTELLATED, HEXAGON, 250 °F NON-METALLIC INSERT
MS21042
US military standard (MS)MS21042 is a US military standard for an all-metal self-locking nut, reduced hexagon and height, rated to 450 °F. It has been superseded by NASM21042, with the same part numbers.
- Official title
- NUT, SELF-LOCKING, 450 DEG. F, REDUCED HEXAGON, REDUCED HEIGHT, RING BASE, NON-CORROSION RESISTANT STEEL
Pins
EN2367
European aerospace standard (EN)EN2367 is a European aerospace standard for a steel split (cotter) pin.
- Official title
- Aerospace series - Split pins in steel EN 2573
MS9245
US military standard (MS)MS9245 is a US military standard for a stainless-steel cotter (split) pin to AMS 7211. It has been superseded by SAE-AS9245.
- Official title
- PIN, COTTER - CRES, AMS 7211
MS24665
US military standard (MS)MS24665 is a US military standard for a cotter (split) pin. It has been superseded by NASM24665.
- Official title
- PIN, COTTER (SPLIT)
NAS1424
NAS · Aerospace Industries AssociationNAS1424 is a National Aerospace Standard (published by the Aerospace Industries Association) for a steel swage-locking pin with a protruding shear head, stump type.
- Official title
- PIN, SWAGE LOCKING, STEEL, PROTRUDING HEAD, SHEAR, STUMP-TYPE
Rivets and blind fasteners
MS20426
US military standard (MS)MS20426 is a US military standard for a solid rivet with a 100° countersunk (flush) precision head. It has been superseded by NASM20426.
- Official title
- RIVET, SOLID, COUNTERSUNK 100 DEG., PRECISION HEAD, ALUMINUM AND TITANIUM COLUMBIUM ALLOY
MS20470
US military standard (MS)MS20470 is a US military standard for a solid rivet with a universal (protruding) head. It has been superseded by NASM20470.
- Official title
- RIVET, SOLID UNIVERSAL HEAD, ALUMINUM ALLOY AND TITANIUM COLUMBIUM ALLOY
MS21140
US military standard (MS)MS21140 is a US military standard for a high-strength pull-type blind fastener, 100° flush head, corrosion-resisting steel. It has been superseded by NASM21140.
- Official title
- FASTENER, BLIND, HIGH STRENGTH, PULL TYPE, POSITIVE MECHANICAL LOCK, 100° FLUSH HEAD, CORROSION RESISTING STEEL, 95 KSI FSU
Thread inserts
MS21209
US military standard (MS)MS21209 is a US military standard for a self-locking helical-coil screw thread insert, corrosion-resistant steel. It has been superseded by NASM21209.
- Official title
- INSERT, SCREW THREAD, COARSE AND FINE, SCREW LOCKING, HELICAL COIL, CRES
Retaining rings
MS16625
US military standard (MS)MS16625 is a US military standard for an internal retaining ring, tapered-section type.
- Official title
- RING, RETAINING, INTERNAL, BASIC (TAPERED SECTION TYPE)
Frequently asked
What is the difference between AN, MS and NAS standards?
AN standards are the older Air Force–Navy aeronautical standards. MS standards are US military standards. NAS standards are National Aerospace Standards published by the Aerospace Industries Association. Many AN and MS hardware standards have since been superseded by NASM documents, the AIA's versions of them, in several cases keeping the same part numbers.
What does it mean when a standard is superseded?
The issuing body has replaced the document with a named successor, such as MS24665 by NASM24665. Each entry below names the successor where the source states one, and says when the part numbers carry over.
What does SAE mean by a stabilised standard?
SAE no longer revises the document, but it has not been cancelled and remains in use. AS3085, AS3208 and AS3209 are examples.
Does Angad Aviation certify parts to these standards?
No. This page explains what each standard covers. Angad Aviation sources parts to the part number you specify, and where a part carries an authorized release certificate (EASA Form 1 or FAA Form 8130-3), it is issued by an approved organisation, not by us.