BOLT,CLOSE TOLERANCE (P/N an174-21) - New Surplus, New
P/N: an174-21
Category: Fasteners & Hardware
This product requires a custom quote. Please contact our sales team for pricing information or submit an RFQ (Request for Quote).
Available Inventory
| Condition | Stock |
|---|---|
| New Surplus | 79 Available |
| New | 2 Available |
Product Description
The AN174-21 is a 1/4-28 UNF close-tolerance hex head bolt manufactured from alloy steel to Army-Navy specifications. This fastener provides precise shank fit for structural joints requiring minimal clearance, particularly in landing gear attach fittings subject to vibration and dynamic loading. The close tolerance ensures interference fit installation, reducing play in critical connections.
Installation requires torquing per FAA AC 43.13-1B and applicable aircraft maintenance manual specifications to achieve proper clamp load and prevent loosening during operation.
Please note: Product descriptions are provided for informational purposes. Always refer to your aircraft's Illustrated Parts Catalog (IPC) to verify part compatibility and specifications.
Frequently Asked Questions
What is the BOLT,CLOSE TOLERANCE (P/N an174-21)?
The AN174-21 is a 1/4-28 UNF close-tolerance hex head bolt manufactured from alloy steel to Army-Navy specifications. This fastener provides precise shank fit for structural joints requiring minimal clearance, particularly in landing gear attach fittings subject to vibration and dynamic loading.
Does the an174-21 meet AN/MS/NAS aviation specifications?
Aircraft hardware is manufactured to military and aviation specifications. The BOLT,CLOSE TOLERANCE conforms to its applicable AN (Air Force-Navy), MS (Military Standard), or NAS (National Aerospace Standard) specification. Contact us for specific specification details.
What material is the an174-21 manufactured from?
Aviation hardware is available in various materials including cadmium-plated steel, stainless steel, aluminum alloy, and titanium depending on the application. Contact us for material certification and specifications for the an174-21.
Can I order the an174-21 in custom quantities?
Yes, we sell hardware in various quantities from single units to bulk lots. The BOLT,CLOSE TOLERANCE is available in: New Surplus, New. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.
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