an hardware - san diego miramar collegefaculty.sdmiramar.edu/faculty/sdccd/dbuser/101h...an hardware...
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AN Hardware
AN Bolt Characteristics
• Hex head • Mild steel or stainless steel
– Cadmium plated for mild steel
• National Fine pitch • Rolled threads • Class 3 fit
AN Bolt Characteristics
• Classes of fit (allowance or distance between bolt diameter and hole diameter) – Class 1 – extra loose – Class 2 – loose (Home Depot hardware) – Class 3 – will drop in hole; no side play
• ~ .003” between bolt and hole diameters
AN Bolt Characteristics
– Class 4 – Close tolerance • Palm press to fit • ~.001” between bolt and hole diameters
– Class 5 – Interference • Bolt is slightly larger than the hole
Designation for Bolts
AN 4 – 7A AN Code
Diameter in 1/16”
Type of Material
Length in 1/8” (base 8)
Absence of Hole in Shank
AN4H7 Hole in Head
AN4C7 CRES AN4D7 Aluminum
AN4HC7 Hole in Head / CRES
AN4-7 Steel
Diameter designation: AN3 through AN20
Designation for Nuts
AN 315 – 4 28 AN Code
Type of Nut
Type of Material
Diameter in Screw Size or
Fraction
Thread Pitch
Designation for Washers
AN 960 – 416 AN Code
Type of Washer
Type of Material
Diameter in Screw Size or
Fraction
Designation for Cotter Pins
AN 380-4-3 AN Code
Type of Fastener and
Material
Diameter in 1/32”
Length in 1/4”
Designation for Screws
AN 520 –416-8 AN Code
Type of Screw and Thread Pitch
Diameter in Screw Size or Fraction
Length in 1/16”
500 NC 501 NF 502 NF 503 NC 505 NC 510 NF 515 NC 520 NF
For type codes that include the pitch with the
head style
Designation for Screws
AN 509 –624-8 AN Code
Type of Screw Diameter in Screw Size or Fraction
Thread Pitch
Length in 1/16”
507 509 525 526
For type codes that do not include the pitch with the head style
Designation for Rivets
AN 470 AD 3-4 AN Code
Type of Rivet
Type of Material
Diameter in 1/32”
Length in 1/16”
Designation for Clevis Bolts
AN 24 – 7A AN Code
Diameter in 1/16” Length in 1/16”
Absence of Hole in Shank
Diameter designation: AN21 through AN36 (#6 through 1”)
Designation for Clevis Pins
AN 394 – 17 AN Code
Diameter in 1/16”
Effective Length in odd 1/32”
Diameter designation: AN392 through AN406 (1/8” through 1”)
AN Code for Fluid Fittings
AN818-6D Type of Fitting
Diameter of Fitting
Type of Material*
*Material: No Letter Plain Steel “D” Aluminum “C” Corrosion Resistant Steel (CRES)