Materials, Mechanical Properties and Markings
| arking | Standard | Description | Mechanical Properties | |||
| Property | lbf/in2 | Mpa | ||||
| Bolts | ||||||
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AS/NZS 2451 |
Hexagon BSW Mild Steel |
Tensile Strength |
62720 |
(432.5) |
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| Yield Stress |
35840 |
(247) |
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| Proof Load Stress |
- |
- |
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AS/NZS 1111 |
Hexagon ISO Metric Commercial 4.6 |
Tensile Strength |
(58015) |
400 |
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| Yield Stress |
(34809) |
240 |
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| Proof Load Stress |
(32634) |
225 |
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AS/NZS 1393 |
Hexagon ISO Metric Coach Screws 4.6 |
Tensile Strength |
(58015) |
400 |
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| Yield Stress |
- |
- |
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| Proof Load Stress |
- |
- |
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AS/NZS 1110 |
Hexagon ISO Metric Precision 8.8 |
Tensile M5 - 15 Strength M20 - 39 |
(116030) (120382) |
800 830 |
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| Yield M5- 16 Stress M20 - 39 |
(92824) (95725) |
640 660 |
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| Proof Load M5 - 16 Stress M20 - 39 |
(84122) (87023) |
580 600 |
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AS/NZS 1110 |
Hexagon ISO Metric Precision 10.9 |
Tensile Strength |
(150840) |
1040 |
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| Yield Stress |
(136336) |
940 |
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| Proof Load Stress |
(120382) |
830 |
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AS/NZS 2465 |
Hexagon Unified High Tensile UNC/UNF SAE Grade 5 |
Tensile 1/4" - 1" Strength 1 1/8-1 1/2 |
120000 105000 |
(827) (724) |
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| Yield 1/4" - 1" Stress 1 1/8-1 1/2 |
92000 81000 |
(634) (558) |
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| Proof Load 1/4" - 1" Stress 1 1/8-1 1/2 |
85000 75000 |
(586) (510) |
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AS/NZS 2465 |
Hexagon Unified High Tensile UNC/UNF SAE Grade 8 |
Tensile Strength |
150000 |
(1034) |
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| Yield Stress |
130000 |
(896) |
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| Proof Load Stress |
120000 |
(827) |
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A.S.B. 108 ANSI B 18.5 |
Cup Square BSW Mild Steel |
Tensile Strength |
58240 |
(402) |
|
| Yield Stress |
29120 |
(201) |
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| Proof Load Stress |
- |
- |
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AS/NZS 1390 |
Cup Square ISO Metric 4.6 |
Tensile Strength |
(58015) |
400 |
|
| Yield Stress |
(34809) |
240 |
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| Proof Load Stress |
(32634) |
225 |
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| Nuts | ||||||
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AS/NZS 2451 |
Hexagon BSW Mild Steel Nuts |
Proof Load Stress |
62720 |
(432.5) |
|
 |
AS/NZS 1112 |
Hexagon ISO Metric Nuts Prop. Class 5 |
Proof Load Stress |
(88473) |
610 |
|
| (Alternative marking can be 5 on one face or Hex flat) | ||||||
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AS/NZS 1112 |
Hexagon ISO Metric Nuts Prop. Class 8 |
Proof Load Stress |
(124733) |
860 |
|
| (Alternative marking can be 5 on one face or Hex flat) | ||||||
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AS/NZS 2465 |
Hexagon Unified High Tensile UNC/UNF Nuts SAE Grade 5 |
Proof Load Stress |
Up to 1" UNC UNF |
120000 109000 |
(827) (751) |
| Over 1" UNC UNF |
105000 94000 |
(724) (648) |
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AS/NZS 2465 |
Hexagon Unified High Tensile UNC/UNF SAE Grade 8 |
Proof Load Stress |
150000 |
(1034) |
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| These charts are not intended to accurately reflect a range of applications but simply to demonstrate that higher strength, smaller diameter, lighter products will normally provide a similar clamp load result at a somewhat lower 'in-place' cost. | |||||||||||
| As always the design engineer will take many other factors into consideration when selecting the appropriate fastener for a given application. | |||||||||||
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| Cold Heading Below is a cold headed part formed from the diameter of wire shown to the right. Unbroken metal flow lines (grain) greatly increase fatigue life and enhance load-carrying ability. |
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| Machining Illustrated below is a representation of a bolt produced by machining a large diameter bar or wire. Grain or metal flow lines are broken through the head and washer section, which creates planes of weakness. |
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| Thread Rolling No metal is cut away, the grain flow lines are unbroken and curve around the thread profiles. The cold rolling stresses the roots in compression, significantly increasing fatigue strength. Smooth roll dies create burnished roots and smooth flanks free from cutter tool marks, reducing potential galling and stress risers. |
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| Thread Cutting The grain flow lines are cut and planes of weakness are created. |
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