Aerospace Hardware Guides & Technical Resources
Welcome to the Monroe Aerospace Guides hub, our reference library for aircraft fasteners and aviation hardware. If you need to decode an AN, MS, or NAS part number, pick the right fastener for a repair, or cross-reference a cancelled spec, these guides cover the types, materials, identification codes, and installation practices behind the parts we stock.
The guides are written for A&P mechanics, engineers, purchasing teams, and MRO shops. Each one links to the matching products in our catalog, so you can go from research to ordering in one step. Monroe Aerospace is an AS9100D and ISO 9001:2015 certified stocking distributor, and the hardware covered here ships with full traceability.
Start With the Fundamentals
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Aircraft Threaded Fasteners: How aircraft bolts and screws differ, NC/NF/UNC/UNF thread series, thread-fit classes, and how to choose a replacement fastener.
Bolts & Screws
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Aircraft Bolts: AN, NAS, and MS bolts, plus close-tolerance and internal-wrenching types, head markings, and part-number coding. Shop AN Bolts, NAS Bolts, and MS Bolts.
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Aircraft Special Purpose Bolts: Clevis bolts, eyebolts, Jo-bolts, and lockbolts, including grip-range selection, installation, and removal. Shop Jo-Bolts and Huck Bolts.
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Aircraft Screws: Structural, machine, self-tapping, and drive screws, with head styles, materials, and AN/NAS coding. Shop AN Screws, NAS Screws, MS Screws, and Stainless Steel Screws.
Nuts & Washers
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Aircraft Nuts: Self-locking and non-self-locking nuts, elastic stop nuts, sheet spring nuts, and wrenching nuts, plus AN/MS coding. Shop Self-Locking Nuts, Castellated Nuts, and Nutplates.
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Aircraft Washers: Plain, lock, shakeproof, and special washers, including AN960, AN970, AN935, NAS143, and MS20002, and where lock washers should not be used. Shop Flat Washers, Lock Washers, and Countersunk Washers.
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AN960 Rev 21 Washer Cross Reference: A table matching cancelled AN960 part numbers to their NAS1149 replacements. Shop Plain Washers.
Rivets & Panel Fasteners
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Aircraft Rivets: Solid-shank and blind rivets, including Cherrylock, Huck, Rivnut, and Hi-Shear pin rivets, with head-style and material codes. Shop Solid Rivets, Cherry Rivets, Blind Rivets, and Huck Rivets.
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Aircraft Turnlock Fasteners: How Dzus, Camloc, and Airloc fasteners work, including components, receptacles, and sizing. Shop Quarter-Turn Fasteners, Dzus Products, and Monroe Quarter-Turn Fasteners.
O-Rings and Seals
- O-rings are bought by spec, not just size. Learn which compounds suit hydraulic fluid, fuel, and high heat, and when to add a backup ring.
Hi-Lok Fasteners
- Hi-Lok collars shear off at a set torque, so pairing the right pin and collar matters. See how to read HL part numbers and check an installed fastener.
Fittings and Hose
- AN flared and MS flareless fittings aren't interchangeable. Learn the part numbers, torque values, and hose installation rules for each.
Electrical Parts
- From ring terminals to bonding jumpers, see the FAA rules for selecting and installing aircraft wiring hardware.
Cotter Pins and Clevis Pins
- Cotter pins are never reused, and sizing and prong bends follow FAA rules. Learn how to install MS24665 cotter pins and MS20392 clevis pins.
Threaded Inserts
- Compare helical coil, key-locked, and potted inserts, with NASA installation and removal steps for each.
Need More Help?
Can't find the guide or part you need? Contact our sales engineers for help with specs, substitutions, and sourcing. You can also request a free catalog, check our aerospace hardware kits, or read the latest articles on the Monroe Aerospace blog.