1. Fastener Facts
Fastener Facts

2. "Fastener Facts" Training Session
Page 1
"Fastener Facts" Training Session
1. Manufacturing Specifications
2. Grade and Manufacturers Markings
3. Flat Washers
4. Proper Assembly

3. Fastener Facts Chemical Properties Page 2 Carbon 0.30 – 0.52%
Type 1 Bolts
Element
Carbon Steel
Carbon Boron Steel
Alloy Steel
Alloy Boron Steel
Carbon
0.30 – 0.52%
Manganese, min
0.60%
Phosphorus, max
0.04%
Sulfur, max
0.05%
Silicon %
0.10 – 0.30%
0.15 – 0.35%

4. At least 2 threads should be all the way through the nut.
Fastener Facts
The first 1-2 "Leading Threads" are smaller in diameter than all other threads.
Page 3
INCORRECT ASSEMBLY
Minimum thread depth should be ≥ the diameter of the fastener being installed.
CORRECT ASSEMBLY
At least 2 threads should be all the way through the nut.

5. Fastener Facts
Page 4
All assembled fasteners are either in the "Tension" or
"Shear" load condition.
Bolts Too Short

6. Fastener Facts Page 5 Grade Marking Grade Marking
Manufacturers Marking
Manufacturers Marking

7. Fastener Facts Hex Head Nut Markings Page 6 Standard Hex Nut
Prevailing Locking Nut

8. Grade Markings Visable
Fastener Facts
Page 7
Grade Marking
Grade Markings Visable

9. Fastener Facts
Page 8
Flat Washers are used to transfer or spread out the load from the fastener. On one side of a flat washer there are rounded edge around the inside diameter and well as the outside diameter. On the opposite side the inside and outside diameters have sharp edges. When assembling the flat washer, position the radius or rounded edges under the head of the bolt, as shown below.
Radius Side
Bolt Elements
Washer Rounded Edges
Washer Rounded Edges
Opposite Side

10. Fastener Facts Page 9 SAE J429 Maximum Angularity Grade 5 and 8 Bolts
The head of the bolt and the flat washer must always be flat with the surface of the part being assembled.
SAE J429 Maximum Angularity
Grade 5 and 8 Bolts
¼” – ¾” 6°
Over ¾” 4°

11. Fastener Facts
Torque Sequence “Star Pattern”
Page 10

12. Fastener Facts
Page 11
When applying torque to a bolted assembly, should the torque be applied to the head of the bolt or the nut?
Torsion is the twisting action of an object due to the applied torque.