AN | - | Air Force / Navy Standards |
NAS | - | National Aerospace Standards |
MS | - | Military Standards |
AMS | - | Aeronautical Material Specifications |
SAE | - | Society of Automotive Engineers |
MIL | - | Military Specifications |
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Wood Screws Screws with a smooth shank and tapered point for use in wood. Abbreviated WS |
Sheet Metal Screws Fully threaded screws with a point for use in sheet metal. Abbreviated SMS |
Machine Screws Screws with threads for use with a nut or tapped hole. Abbreviated MS |
Hex Bolts Bolts with a hexagonal head with threads for use with a nut or tapped hole. Abbreviated HHMB or HXBT |
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Carriage Bolts |
Lag Bolts Bolts with a wood thread and pointed tip. Abbreviated Lag |
Eye Bolts A bolt with a circular ring on the head end. Used for attaching rope or chain. |
Eye Lags Similar to an eye bolt but with wood threads instead of machine thread. |
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U-Bolts Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend. |
J-Bolts J shaped bolts are used for tie-downs or as an open eye bolt. |
Flat A countersunk head with a flat top. Abbreviated FH |
Oval A countersunk head with a rounded top. Abbreviated OH or OV |
Pan A slightly rounded head with short vertical sides. Abbreviated PN |
Truss |
Round |
Hex A hexagonal Head. Abbreviated HH or HX |
Hex Washer A hex head with built in washer. |
Slotted Hex Washer A hex head with built in washer and a slot. |
Socket Cap |
Button A low profile rounded head using a socket drive. |
Head Marking | Grade and Material |
Nominal Size Range (inches) |
Mechanical Properties | ||
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Proof Load (psi) |
Min. Yield Strength (psi) |
Min. Tensile Strength (psi) |
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No Markings |
Grade 2Low or medium carbon steel |
1/4 thru 3/4 | 55,000 | 57,000 | 74,000 |
>3/4 thru 1-1/2 | 33,000 | 36,000 | 60,000 | ||
3 Radial Lines |
Grade 5Medium Carbon Steel, Quenched and Tempered |
1/4 thru 1 | 85,000 | 92,000 | 120,000 |
>1 thru 1-1/2 | 74,000 | 81,000 | 105,000 | ||
6 Radial Lines |
Grade 8Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 1-1/2 | 120,000 | 130,000 | 150,000 |
Stainless markings vary. Most stainless is non-magnetic | 18-8 StainlessSteel alloy with 17-19% Chromium and 8-13% Nickel |
1/4 thru 5/8 | 40,000 Min. 80,000 – 90,000 Typical | 100,000 – 125,000 Typical | |
3/4 thru 1 | 40,000 Min. 45,000 – 70,000 Typical | 100,000 Typical | |||
Above 1 | 80,000 – 90,000 Typical | ||||
Proof Load: Tensile load which the bolt must withstand without any evidence of permanent set. Yield Strength: Load at which the bolt exhibits a specific permanent deformation. Tensile Strength: Maximum tensile load which the bolt can withstand before breaking or failing. |