What are close tolerance bolts used for?
Table of Contents
- 1 What are close tolerance bolts used for?
- 2 How is a close tolerance bolt identified?
- 3 What bolts are used in aviation?
- 4 What does close tolerance mean?
- 5 How does the manufacture of close tolerance bolts differ from standard An bolts and in what applications are they used?
- 6 Why are bolts used in aircraft?
- 7 What is the difference between general purpose and close tolerance bolts?
- 8 Why are anchor bolt tolerances so difficult?
What are close tolerance bolts used for?
Close Tolerance Bolts
| Part Number | Qty Discount Price | Indiv. Price |
|---|---|---|
| AN173-4A – Bolt – Machine, Aircraft – Close Tolerance – 10-32 x 17/32 – Grip 1/8 – Cadmium II Plated | $1.37 | $1.37 |
| AN173-6 – Bolt – Machine, Aircraft – Close Tolerance – Drilled Shank – 10-32 x 25/32 – Grip 3/8 – Cadmium II Plated | $1.10 | $1.10 |
What is the difference between a close tolerance bolt and a general purpose bolt?
What is the difference between a close tolerance bolt and a general purpose bolt? Close tolerance bolts are machined to more accurate dimensions. For what types of applications are self-locking nuts not allowed? Those applications where the nut or bolt are subject to rotation.
How is a close tolerance bolt identified?
A special bolt used in aircraft construction in which the shank is ground to a tolerance of +0.000, -0.0005 inch. Close-tolerance bolts are identified by a triangle around the mark on the bolt head that identifies the material of which the bolt is made.
What kind of bolt is typically used in airframe structures?
Aerospace Bolts
– Aerospace Bolts: most bolts used in aircraft structures are typically general purpose, AN bolts, NAS internal wrenching or close tolerance bolts, or MS bolts, they can be fabricated from cadmium or zinc plated corrosion resistant steel, unplated corrosion-resistant steel, and anodized aluminum alloys.
What bolts are used in aviation?
Aircraft quality bolts are made from alloy steel, stainless or corrosion resistant steel, aluminum alloys and titanium. Within our industry the first two are the most common. Aircraft bolts will always have a marking on their head. If you see no markings at all on the head of a bolt, do not use it.
What material are most aircraft bolts plated with?
Aircraft bolts are fabricated from cadmium- or zincplated corrosion resistant steel, unplated corrosion resistant steel, or anodized aluminum alloys. Most bolts used in aircraft structures are either general purpose, AN bolts, or NAS internal wrenching or close tolerance bolts, or MS bolts.
What does close tolerance mean?
Close tolerance machining is a precision CNC machining process designed to ensure a part or component is produced to precise specifications. Close tolerance machining and small part machining are just some of JW Machine’s specialties.
What is A325?
ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1⁄2 to 11⁄2 inches (13 to 38 mm) in diameter.
How does the manufacture of close tolerance bolts differ from standard An bolts and in what applications are they used?
Close tolerance bolts are machined more accurately than general purpose bolts and they are used in applications requiring a very tight fit. Close tolerance bolts can be either AN or NAS and typically have a head marking consisting of a raised or recessed triangle.
What is the advantage of using the aircraft airframe for grounding electrical equipment?
This is because an airplane’s body is capable of absorbing and dissipating the excess electricity. When lightning strikes an airplane, the body absorbs the excess electricity due to its highly conductive nature, and it releases the electricity into the atmosphere through the static dischargers.
Why are bolts used in aircraft?
Bolts are used in aircraft construction in areas where high strength is needed. Where this strength is not necessary screws are substituted.
What are general purpose bolts?
General Purpose Bolts The hex head aircraft bolt (AN-3 through AN-20) is an all purpose structural bolt used for general applications involving tension or shear loads where a light drive fit is permissible (0.006 inch clearance for a 5/8 inch hole, and other sizes in proportion).
What is the difference between general purpose and close tolerance bolts?
This type of bolt is machined more accurately than the general purpose bolt. Close tolerance bolts may be hex headed (AN-173 through AN-186) or have a 100° countersunk head (NAS-80 through NAS-86). They are used in applications where a tight drive fit is required (the bolt will move into position only when struck with a 12 to 14 ounce hammer).
What is the difference between Nasnas bolts and close tolerance bolts?
NAS bolts have a higher tensile strength (usually about 160,000 psi) and can be identified by a cupped out head. Close tolerance bolts are machined more accurately than general purpose bolts and they are used in applications requiring a very tight fit.
Why are anchor bolt tolerances so difficult?
Adding to the complexity of anchor bolt tolerances is the difficulty in accurately measuring the location of individual and groups of anchor bolts. It is standard practice to layout the location of anchor bolts along the top of the concrete. However, anchor bolts locations are commonly verified by measuring to the top of the bolt.
What kind of bolts are used in aerospace?
Aerospace Bolts Aircraft bolts are fabricated from cadmium or zinc plated corrosion resistant steel, unplated corrosion resistant steel, and anodized aluminum alloys. Most bolts used in aircraft structures are either general purpose, AN bolts, or NAS internal wrenching or close tolerance bolts, or MS bolts.