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| Lag Screw Specifications |
| 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 |
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| 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. |
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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 and ( 800 ) 764-8488 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com - Copyright © 2004 by Smith Fastener Company - Please report website problems to: WebMaster - Last updated: October 27th, 2004 http://www.smithfast.com/lagscrews.html |