| Hex Lag Screws: Dimensions (ASME B18.2.1-1996) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Basic Product Diameter |
Threads Per Inch | Body or Shoulder Diameter (E) | Width Across Flats (F) | Width Across Corners (G) | Head Height (H) | Shoulder Length (S) | |||||||
| Max | Min | Basic | Max | Min | Max | Min | Basic | Max | Min | Min | |||
| #10 | .1900 | 11 | .199 | .178 | 9/32 | .281 | .271 | .323 | .309 | 1/8 | .140 | .110 | .094 |
| 1/4 | .2500 | 10 | .260 | .237 | 7/16 | .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 | 19/64 | .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 |
* Click on the basic product diameter to find products.
| Lag Screws: Tolerance on Length | |||
|---|---|---|---|
| Nominal Screw Size | Nominal Screw Length | ||
| Up to 6 in | Over 6 in | ||
| 1/2 and smaller |
+/- 0.12 | +/- 0.25 | |
| Over 1/2 | +/- 0.25 | +/- 0.25 | |
| Lag Screws: Performance & Mechanical Specs | |
|---|---|
|
Description |
A full-bodied bolt with hex head, spaced threads and a gimlet point. |
| Applications |
Steel, Electro-plated Zinc: For use in wood in non-corrosive environments Steel, Hot-dip Galvanized: For use in corrosive environments Stainless Steel: Has superior corrosion resistance to galvanized steel bolts. |
| Material |
Steel: AISI 1006-1022 or equivalent steel Stainless Steel: 18-8 stainless |
| Heat Treatment |
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 Degrees (F) to a dead soft condition and is not normally thermally reversible. |
| Hardness |
Steel: Rockwell B70-B100 Stainless Steel: 100,000 - 125,000 psi |
| Minimum Length of Thread |
The minimum length of thread shall be equal to 1/2 the nominal screw length plus .50 inches, or 5.00 inches, whichever is shorter. Screws too short for this formula shall be threaded as close to the head as practicable. |
| Fully Threaded Hex Washer Lag Screws: Dimensions (Low Carbon & Grade 5) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Screw Diameter |
Threads per Inch |
Head Height (H) | Width Across Flats (F) | Washer Diameter (C) | Washer Thickness | Major Diameter | |||||
| Max | Min | Max | Min | Max | Min | Max | Min | Max | Min | ||
| 1/4 | 10 | .190 | .172 | .437 | .429 | .625 | .610 | .060 | .050 | .260 | .237 |
| 5/16 | 9 | .230 | .200 | .437 | .429 | .625 | .610 | .060 | .050 | .324 | .298 |
| 5/16-High Head | 9 | .312 | .300 | .437 | .429 | .625 | .610 | .060 | .050 | .324 | .298 |
| Fully Threaded Hex Washer Lag Screws: Performance & Mechanical Specs (Low Carbon & Grade 5) | |
|---|---|
|
Description |
A fully threaded fastener with a spaced thread pitch, tapered point, and an integrally formed hex washer head with an indented top surface. |
| Applications |
Designed specifically for attaching track brackets and flag brackets of garage door assemblies to wooden door jambs. |
| Material |
AISI 1018 or equivalent steel |
| Tolerance on Length |
+/- .012 |
Additional Resources
