Lag Screw Specifications

Lag Screw images

Hex Lag Screws      ASME B18.2.1   1996

Basic Product
Diameter
Threads
Per Inch
E F G H S
Body or
Shoulder
Diameter
Width Across Flats Width Across
Corners
Head Height Shoulder
Length
Max Min Basic Max Min Max Min Basic Max Min Min
No. 10 .1900 11 .199 .178 9/32 .281 .271 .323 .309 1/8 .140 .110 .094
1/4 .2500 10 .260 .237 7/19 .438 .425 .505 .484 11/64 .188 .150 .094
5/16 .3125 9 .324 .298 1/2 .500 .484 .577 .552 7/32 .235 .195 .125
3/8 .3750 7 .388 .360 9/16 .562 .544 .650 .620 1/4 .268 .226 .125
7/16 .4375 7 .452 .421 5/8 .625 .603 .722 .687 1-/64 .316 .272 .156
1/2 .5000 6 .515 .482 3/4 .750 .725 .866 .826 11/32 .364 .302 .156
5/8 .6250 5 .642 .605 15/16 .938 .906 1.083 1.033 27/64 .444 .378 .312
3/4 .7500 4-1/2 .768 .729 1-1/8 1.125 1.088 1.299 1.240 1/2 .524 .455 .375
7/8 .8750 4 .895 .852 1-5/16 1.312 1.269 1.516 1.447 37/64 .604 .531 .375



Tolerance on Length Nominal Screw Size Nominal Screw Length
Thru 6 in. Over 6 in.
1/2 and smaller +/- .12 +/- .25
Over 1/2 +/- .25 +/- .25
* The length of a lag screw is measured from the underhead
bearing surface to the extreme end of the screw



Description A full-bodied bolt with hex head, spaced threads and a gimlet point.
Applications
and
Advantages
Steel Electro-plated Zinc:  For use in wood in non-corrosive environments.
Steel Hot-Dip Galvanized:  For use in corrosive environments.
Stainless:  Has superior corrosion resistance to galvanized steel bolts.
Material Steel: AISI 1006 - 1022 or equivalent steel
Stainless:18-8 stainless steel, passivated
Heat Treatment Steel:  Rockwell B70 - B100
Stainless:  The austenitic alloys develop their strength through work hardening during the fastener manufacturing process, as seen from the hardness properties below. The only heat treatment normally available on austenitic stainless alloys is annealing, which is done at approximately 1900*#176;F to a dead soft condition and is not normally reversible.
Hardness Steel:  Rockwell B70 - B100
Stainless:  Rockwell B95 - C32
Tensile
Strength
Steel:  60,000 psi minimum
Stainless:  100,000 - 125,000 psi (approximate)
Minimum
Thread Length
The minimum length of thred shall be equal to 1/2 the nominal screw length plus .50 inch or 5 inches whichever is shorter.
Screws too short for this formula shall be threaded as close to the head as practicable.
Plating See plating page for plating information.


Tapping Screws | Machine Screws



Smith Fastener Company • 3613 East Florence Avenue, Bell, California, 90201
Phone: ( 323 ) 587-0382 • FAX: ( 323 ) 587-8712 • E-mail: [email protected]
Copyright © 2009 by Smith Fastener Company

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