AMS 261 Metals – Final Review Study Guide, Practice Questions &
Revision Notes
NAS Rivet Code Cross: Top Left - ✔✔Fastener Identity (Head Type)
BJ vs BB - ✔✔BJ = Universal Head
BB = Countersunk
NAS Rivet Code Cross: Top Right - ✔✔Diameter and manufactured head position
NAS Rivet Code Cross: Bottom Left - ✔✔Dimple and countersunk data
NAS Rivet Code Cross: Bottom Right - ✔✔Fastener Length
AN426 / MS20426 - ✔✔100° Countersunk rivet head
NAS1097 - ✔✔100* Countersunk rivet head with less of a diameter than AN or MS
AN470 / MS20470 - ✔✔Universal protruding head rivets
Most common rivet alloy - ✔✔2117
How is 2117 identified? - ✔✔Dimple
What is 2117 part number code? - ✔✔AD (A Dimple)
,What are rivets called? - ✔✔Ice box rivets
What are icebox rivets? - ✔✔Rivets heat treated multiple time and then stored in a freezer at
~75% hardness. After rivets are taken out of freezer, they begin to finish hardening withing ~25
minutes.
How are 5056 rivets identified? - ✔✔A raised cross
Rivets used for magnesium components - ✔✔5056
Head markings on 2017 ice box rivets - ✔✔A Raised Dot in the center of the rivet head
(Inverted dimple)
What is the part number code for 5056? - ✔✔B
Head markings on 7050 rivets - ✔✔A circle on the top of the head
What is the part number code for 7050? - ✔✔E
Head markings on carbon steel rivets - ✔✔A recessed triangle
Head markings on CRES rivets - ✔✔A recessed dash
Head markings on monel rivets - ✔✔2 dimples
Minimum rivet diameter rule - ✔✔Rivet diameter should not be less than 3X the thickness of
the thickest sheet of metal
, How is the minimum rivet length determined? - ✔✔The total thickness of the material, plus
one rivet diameter measurement
How is the maximum rivet length determined? - ✔✔The total thickness of the material, plus
one and a half (1.5) rivet diameter measurements
Rivet length is measured in _____ increments using _____ increment variables for the range -
✔✔1/16"
.5
Drill Stop and CLECOS color/sizes: - ✔✔Silver - 3/32"
Copper - 1/8"
Black - 5/32"
Brass - 3/16
Rivet Distance from the edge: - ✔✔Minimum: 2X rivet diameter
Maximum: 4X rivet diameter
Rivet Pitch - ✔✔The distance between adjacent rivets in the same row
Transverse rivet pitch - ✔✔The distance between adjacent rivet rows
Minimum and maximum rivet pitch: - ✔✔Minimum: 3X rivet diameter
Maximum: 12X rivet diameter
Revision Notes
NAS Rivet Code Cross: Top Left - ✔✔Fastener Identity (Head Type)
BJ vs BB - ✔✔BJ = Universal Head
BB = Countersunk
NAS Rivet Code Cross: Top Right - ✔✔Diameter and manufactured head position
NAS Rivet Code Cross: Bottom Left - ✔✔Dimple and countersunk data
NAS Rivet Code Cross: Bottom Right - ✔✔Fastener Length
AN426 / MS20426 - ✔✔100° Countersunk rivet head
NAS1097 - ✔✔100* Countersunk rivet head with less of a diameter than AN or MS
AN470 / MS20470 - ✔✔Universal protruding head rivets
Most common rivet alloy - ✔✔2117
How is 2117 identified? - ✔✔Dimple
What is 2117 part number code? - ✔✔AD (A Dimple)
,What are rivets called? - ✔✔Ice box rivets
What are icebox rivets? - ✔✔Rivets heat treated multiple time and then stored in a freezer at
~75% hardness. After rivets are taken out of freezer, they begin to finish hardening withing ~25
minutes.
How are 5056 rivets identified? - ✔✔A raised cross
Rivets used for magnesium components - ✔✔5056
Head markings on 2017 ice box rivets - ✔✔A Raised Dot in the center of the rivet head
(Inverted dimple)
What is the part number code for 5056? - ✔✔B
Head markings on 7050 rivets - ✔✔A circle on the top of the head
What is the part number code for 7050? - ✔✔E
Head markings on carbon steel rivets - ✔✔A recessed triangle
Head markings on CRES rivets - ✔✔A recessed dash
Head markings on monel rivets - ✔✔2 dimples
Minimum rivet diameter rule - ✔✔Rivet diameter should not be less than 3X the thickness of
the thickest sheet of metal
, How is the minimum rivet length determined? - ✔✔The total thickness of the material, plus
one rivet diameter measurement
How is the maximum rivet length determined? - ✔✔The total thickness of the material, plus
one and a half (1.5) rivet diameter measurements
Rivet length is measured in _____ increments using _____ increment variables for the range -
✔✔1/16"
.5
Drill Stop and CLECOS color/sizes: - ✔✔Silver - 3/32"
Copper - 1/8"
Black - 5/32"
Brass - 3/16
Rivet Distance from the edge: - ✔✔Minimum: 2X rivet diameter
Maximum: 4X rivet diameter
Rivet Pitch - ✔✔The distance between adjacent rivets in the same row
Transverse rivet pitch - ✔✔The distance between adjacent rivet rows
Minimum and maximum rivet pitch: - ✔✔Minimum: 3X rivet diameter
Maximum: 12X rivet diameter
