BOLT,MACH 1/4-28-5.78 STL (P/N an4-56a) - New Surplus, As Removed
P/N: an4-56a
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 | 1 Available |
| As Removed | 1 Available |
Product Description
The AN4-56A is a 1/4-28 UNF hex-head aircraft bolt in steel with an undrilled shank. This fastener conforms to AN/NASM4 dimensional standards for airframe applications. The undrilled shank (suffix A) pairs with self-locking nuts to prevent vibration loosening in flight-critical connections.
Commonly used in control linkages and structural assemblies where precise 1/4-28 threading is required. Installation requires matching grip length to component thickness and applying torque per aircraft maintenance manual specifications. Verify part eligibility in the Illustrated Parts Catalog before use.
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,MACH 1/4-28-5.78 STL (P/N an4-56a)?
The AN4-56A is a 1/4-28 UNF hex-head aircraft bolt in steel with an undrilled shank. This fastener conforms to AN/NASM4 dimensional standards for airframe applications.
Does the an4-56a meet AN/MS/NAS aviation specifications?
Aircraft hardware is manufactured to military and aviation specifications. The BOLT,MACH 1/4-28-5.78 STL 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 an4-56a 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 an4-56a.
Can I order the an4-56a in custom quantities?
Yes, we sell hardware in various quantities from single units to bulk lots. The BOLT,MACH 1/4-28-5.78 STL is available in: New Surplus, As Removed. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.
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