Lag boltsare used to fasten wood to wood and metal to wood, attach objects to wood, and affix items to concrete and masonry when combined with lag expansion shields. They are heavy-duty wood screws that are available in larger sizes—both in terms of diameter and length—and usually have a hex head to facilitate higher installation torque using a wrench. While lateral strength is lower than a comparable bolt and nut, lag bolts are useful when access to one side of the joint is limited, the appearance of a nut is undesirable or through-bolt length is excessive. Lag bolts are also known as:
Being a thread-forming-type screw, they create their own mating threads during installation—no nut is needed so a through-hole is not required.
Lag bolts have coarse, widely spaced threads (10 threads per inch for a 1/4" bolt, declining to just 3 1/4 threads per inch for a 1 1/4" lag bolt); threading is standard right-hand. Short lengths are fully threaded. The minimum threaded length for longer lengths is one-half the bolt length plus 1/2", or 6", whichever is shorter. A gimlet point allows them to start threading into wood easily: "A gimlet point is a threaded cone point usually having a point angle of 45 to 50 degrees."
Typically, lag bolt sizes range from 1/4" to 3/4" in diameter, and lengths span from about 1" to 16". Although 7/16" is detailed in the ASME standard, that size is not commonly available. Measure length from under the head to the threaded end of the bolt.
The size of the head varies with the size of the lag bolt. Since the bolt is externally wrenched, sufficient space around the head must be allowed for wrench clearance. Table 1 lists head width across flats, which is wrench size, and across corners, head height and a listing of threads per inch.
Steel and stainless steel are the most prevalent materials for lag bolts.
Common finishes for steel are zinc plating and hot dip galvanizing. Zinc, the most popular and least expensive commercial plating, offers moderate corrosion resistance. Hot dip galvanized is a thick coating of zinc that protects against corrosion in harsh environments. Stainless steel, though, is a better choice when corrosion is of concern. Hot dip galvanized and stainless steel are usually recommended if the bolts (less than 1/2" in diameter) will be used with pressure preservative treated wood such as "ACQ" (Alkaline Copper Quaternary)—check local building codes and contact your lumber supplier for recommendations.
Similar to wood screws, a stepped pilot hole is recommended for lag bolts. The pilot hole for the body (the unthreaded section of the shank adjacent to the head) should match the bolt size (3/8" hole for a 3/8" bolt, for example). The pilot hole for the threaded section varies with bolt size and wood density, as suggested in Table 2 (see a table of Species Groups for Sawn Lumber, which lists the species in each group). If the pilot hole is too small, the bolt may break during installation. If the hole is too large, withdrawal resistance may be compromised. Saturate drilled holes with a preservative to prevent the migration of decay fungi if you drill into an untreated area of treated lumber. Use soap or beeswax to lubricate lag bolts during installation (be sure to remove any exposed residue before applying a wood finish).
Always use a large diameter washer under the head to distribute clamping force over a larger area and minimize compression of the wood.
It is advisable to match materials and finishes of bolts and washers (for example, use a hot dip galvanized washer with a hot dip galvanized bolt).
Ultimate tensile strength of a lag bolt is said to be developed with a thread penetration of about seven times the bolt diameter in denser species (specific gravity greater than 0.61) and 10 to 12 times the bolt diameter in less dense species (specific gravity less than 0.42). (The table, Species Groups for Sawn Lumber, includes specific gravity for each of the species.)
Lag and machine bolts are the preferred fasteners for fastening heavy wood members in structures. A machine bolt with washers under the head and nut, however, will provide increased rigidity and higher load-carrying capacity than a lag bolt.
Refer to American Society of Mechanical Engineers Standard ASME B18.2.1, Square and Hex Bolts and Screws, for specifications relating to lag bolts.
Lag Bolt Dimensions | |||||
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Nominal Size | Threads per Inch | Head Width | Head Height | ||
Across Flats | Across Corners | ||||
Fraction | Decimal | Basic | Avg | Basic | |
1/4 | 0.2500 | 10 | 7/16 | 1/2 | 11/64 |
5/16 | 0.3125 | 9 | 1/2 | 9/16 | 7/32 |
3/8 | 0.3750 | 7 | 9/16 | 41/64 | 1/4 |
7/16* | 0.4375 | 7 | 5/8 | 45/64 | 19/64 |
1/2 | 0.5000 | 6 | 3/4 | 27/32 | 11/32 |
5/8 | 0.6250 | 5 | 15/16 | 1 1/16 | 27/64 |
3/4 | 0.7500 | 4 1/2 | 1 1/8 | 1 17/64 | 1/2 |
Lag Bolt Pilot Hole Sizes | ||||
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Bolt Size | Pilot Hole Size | |||
Body | Threaded Section | |||
Soft Wood Groups III & IV | Medium Wood Group II | Hard Wood Group I | ||
1/4 | 1/4 | 3/32 | 5/32 | 3/16 |
5/16 | 5/16 | 9/64 | 3/16 | 13/64 |
3/8 | 3/8 | 11/64 | 15/64 | 1/4 |
7/16* | 7/16 | 13/64 | 9/32 | 19/64 |
1/2 | 1/2 | 15/64 | 5/16 | 11/32 |
5/8 | 5/8 | 5/16 | 13/32 | 29/64 |
3/4 | 3/4 | 13/32 | 1/2 | 9/16 |
Table 2. Lag Bolt Pilot Hole Sizes.Unthreaded body and threaded section pilot hole sizes, in inches, for soft, medium and hard wood. See a table of Species Groups for Sawn Lumber for a listing of species in each group. *7/16" is not commonly available.
Species Groups for Sawn Lumber | ||
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Species | Group | Specific Gravity[1] |
Ash, Commercial White | I | 0.62 |
Aspen | IV | 0.40 |
Aspen, Northern [3] | III | 0.42 |
Beech | I | 0.68 |
Birch, Sweet and Yellow | I | 0.66 |
Cedar, Northern White | IV | 0.31 |
Cedars, Western [2] | IV | 0.35 |
Coast Species [3] | IV | 0.39 |
Cottonwood, Black | IV | 0.33 |
Cottonwood, Eastern | IV | 0.41 |
Cypress, Southern | III | 0.48 |
Douglas Fir-Larch [2] | II | 0.51 |
Douglas Fir-Larch (dense) | II | [4] |
Douglas Fir, South | III | 0.48 |
Eastern Woods | IV | 0.38 |
Fir, Balsam | IV | 0.38 |
Hem-Fir [2] | III | 0.42 |
Hemlock | ||
Eastern-Tamarack [3] | III | 0.45 |
Mountain | III | 0.47 |
Western [2] | III | 0.48 |
Hickory and Pecan | I | 0.75 |
Maple, Black and Sugar | I | 0.66 |
Northern Species [3] | IV | 0.35 |
Oak, Red and White | I | 0.67 |
Pine | ||
Eastern White [2] | IV | 0.38 |
Idaho White | IV | 0.40 |
Lodgepole | III | 0.44 |
Northern | III | 0.46 |
Ponderosa [3] | III | 0.49 |
Ponderosa-Sugar | III | 0.42 |
Red [3] | III | 0.42 |
Southern | II | 0.55 |
Southern (dense) | II | [4] |
Western White | IV | 0.40 |
Poplar, Yellow | III | 0.46 |
Redwood | ||
California | III | 0.42 |
California (open grain) | IV | 0.37 |
Spruce | ||
Eastern | III | 0.43 |
Engelmann-Alpine Fir | IV | 0.36 |
Sitka | III | 0.43 |
Sitka, Coast [3] | IV | 0.39 |
Spruce-Pine-Fir [3] | III | 0.42 |
West Coast Woods | ||
(mixed species) | IV | 0.35 |
White Woods (Western Woods) | IV | 0.35 |
NOTES: 1. Based on weight and volume when oven-dry. These specific- gravity values are to be used for the determination of withdrawal design values for lag bolts, nails, spikes, and wood screws.
2. Also applies when species name includes the designation "North."
3. Applies when graded in accordance with National Lumber Grades Authority Standard Grading Rules for Canadian Lumber.
4. The specific gravity of dense lumber is slightly higher than for medium-grain lumber. However, the design values for this group are based on the average specific gravity of the species, which is 0.51 for Douglas Fir-Larch and 0.55 for Southern Pine.
5. For reference only.
duplex stainless f51 f53 f55 f44 f904l fasteners bolt nut screw stud washer bolts nuts fastener threaded rod rods screws studs washers Bolt:
M6-M64; Nut: M3-M64 ;
Threaded Rod:4-2000mm (all thread, double end thread)
Standards: DIN 931, DIN 933, DIN 934, DIN 439, DIN 835, DIN 7991, DIN 975, DIN 976, DIN 912, ISO, JIS, ANSI/ASME, BS, etc
Packing : Plywood case or wooden box
Exported countries: United States, Germany, Saudi Arabia, South Korea, Kuwait, Turkey, United Arab Emirates, Oman, Egypt, Indonesia, Malaysia, Singapore, Thailand, Sri Lanka, Russia, West Africa& Latin Americaetc
Duplex Stainless Steel Fasteners | Super Duplex Stainless Steel Fasteners |
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Alloy | Common Name | Related Specifications | ||
---|---|---|---|---|
European | UNS | ASTM/ASME | ||
Alloy 2205 | SAF 2205 ® | 1.4462 | S32205 | F60 |
31803 | 31803 | 1.4462 | S31803 | F51 |
MD Exports LLP produces duplex fasteners in all grades of duplex, to customer specification. Duplex grades are a mixed microstructure of Austenite and Ferrite, combining the properties of both (hence the name DUPLEX). Duplex stainless steels have high corrosion resistance as well as a high strength. Mechanical properties are around double that of a typical austenitic grade such as 316. They would also normally offer higher stress cracking resistance in Chloride solutions for example. They are composed typically of 22% Chromium, 5 % nickel. Having worked with duplex since its outset, the duplex bolting continues to account for a core part of our business, along with Super duplex.
Alloy | Common Name | Related Specification | ||
---|---|---|---|---|
European | UNS | ASTM/ASME | ||
Alloy 255 | Ferralium 255 ® | 1.4507 | S32550 | F61 |
Zeron 100 | Zeron 100 ® | 1.4501 | S32760 | F55 |
Alloy 2507 | SAF 2507 ® | 1.4410 | S32750 | F53 |
We are proud that MD Exports LLP is the world’s number Ten bespoke producer of Super Duplex bolting. Super Duplex stainless steel grades are similar to standard duplex, but they contain a higher content of Chromium, thus enhancing the corrosion resistance and mechanical properties. MD Exports LLP produces fasteners in all three types of Super Duplex.
Super Duplex Steel Fasteners / Nut / Bolts / Washer / Screws
Min. Order: 1 Piece
FOB Price: US $1 to 100 (Fastener Available in Every Size)
Production Capacity: 500 Ton/Tons per Month
Tags : Super Duplex Steel Fasteners / Super Duplex Steel Nut / Super Duplex Steel Bolts / Super Duplex Steel Washer / Super Duplex Steel Screws
Duplex Steel 2205 Bolts Available Types | |||
SURFACE COATINGS | |||||
Mirror Buffed | Hot Dipped Galvanizing | Epoxy Coating | Electro Polished | Passivation | |
Teflon Coating | Oxidized | Zinc Plating | Chrome Plating | ||
Fasteners ASTM & SAE Specifications ASTM A36 ASTM A153 ASTM A193 ASTM A194 ASTM A307 ASTM A320 ASTM A325 ASTM A354 ASTM A449 ASTM A490 ASTM A563 ASTM A572 ASTM A588 ASTM B695 ASTM F436 ASTM F593 ASTM F594 ASTM F844 ASTM F1554 ASTM F1941 ASTM F2329 SAE J429
Bolts Hex Bolts, Heavy Hex Bolts, Structural Bolts, Square Bolts, Timber Bolts, Hex Lag Screws, Square Lag Screws, Carriage Bolts, Timber Spikes, Machine Bolts, Washer Head Bolts, Round Head Bolts, Countersunk Bolts, Step Bolts, Headed Anchor Bolts, Custom Heading.
Washer Standard Flat Washers, Hardened Round Washers, Lock Washers, Malleable Iron Washers, Round Plate Washers, Square Plate Washers, Ogee Washers, Beveled Washers, Hardened Beveled Washers, Anchor Rods Anchor Rods, Swedged Rods, Tie Rods, All-Thread Rods, Drift Pins, Threaded Rebar.
Anchor Bolts 90 Degree Anchor Bolts, U-Bolts (Round Bend), Eye Bolts (Closed), Hook Bolts (Square Bend), U-Bolts (Square Bend), Eye Bolts (Open), Hook Bolts (Round Bend), J-Bolts, Hook Bolts (Special).
Fasteners Nuts Finished Hex Nuts, Heavy Hex Nuts, Square Nuts, Finished Jam Nuts, Heavy Hex Jam Nuts, Sleeve Nuts, Hex Coupling Nuts. 2-H Heavy Hex Nuts, Acorn Nuts, Heavy Hex Nuts, Jam Nuts, Kep Nuts, Nylon Insert Locknuts, Slotted Nut, High Nut, Castle Nut, Custom Nut, Serrated Flange Nut, Auto Locknuts, Coupling Nuts, Slotted Nuts, Square Nuts
Anchor Bolt, Elevator Bolt, Tap Bolts, Hex Cap Screws, Stove Bolt, Wedge Anchors, Flat Head Cap Screws, Hanger Bolt, Socket Cap Screw, L-9 Hi-Head Cap Screws, U Bolt, Plow Bolts, Shoulder Bolt, Flange Bolt, SQ Head Set Screws.
Machine Screws, Tapping Screws, Wood Screws, Self Drilling Screws, Thread Cutting, Stainless Steel Screws, Hastelloy Screws, Inconel Screws, Copper Screws, Titanium Screws, Alloy Steel Screws, Monel Screws, Nickel Screws, Brass Screws, Duplex Steel Screws, Super Duplex Steel Screws.
Wing Nuts, Miscellaneous Nuts, Flex Lock Nut, 2 Way Lock Nut, Cap Nut, K Lock Nut, T Tee Nuts, Flange Lock Nut, Stainless Steel Nuts, Alloy Steel Nuts, Monel Nuts, Nickel Nuts, Brass Nuts, Duplex/Super Duplex Steel Nut, Hastelloy Nuts, Inconel Nuts, Copper Nuts, Titanium Nuts
J Bolt, Draw Bolt, Toggle Bolts, Carriage Bolts, Machine Bolt, Hex Head Bolt, Hex Bolts, Grub Screw, Lag Bolts, Set Screw, Eye Bolt, Scraper Blade Bolts, Step Bolt, Copper Bolts, Stainless Steel Bolts, Inconel Bolts, Titanium Bolts, Monel Bolts, Brass Bolts, Nickel Bolts, Alloy Steel Bolts, Duplex & Super Duplex Steel Bolts, Hastelloy Bolts.
Brand Name : We are Dealer, Distributor, Stockist, Stockholder and Supplier of Below Brand Products |
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http://www.columbus.co.za : COLUMBUS in SOUTH AFRICA: Lean Duplex Steel - e.g. 2001/1.4482 / 2304/1.4362 / Standard duplex Steel e.g. 2205/1.4462. |
http://www.sandmeyersteel.com: SANDMEYER STEEL ( USA & CANADA): Alloy 2205Duplex Stainless Steel Plates/ Alloy 2507 Duplex Stainless Steel Plate Manufacturers - |
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http://www.aalco.co.uk/: AALCO in UKStainless Steel Pipes Tubes Manufacturers -- |
http://www.sail.co.in/: SALEM Productsin INDIA : Duplex Steel Sheet Plate Coils Manufacturers --- |
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http://www.schoeller-bleckmann.co.uk/: SCHOELLER BLECKMANN ENGLAND & DUBAI: Schoeller-Bleckmann (UK) is a major stockholder and distributor of Stainless Steel Tube, Pipe & Hollow Bar. |
http://smt.sandvik.com/en-in/: SANDVIK ( SWEDEN & INDIA ) : Duplex stainless steels / Sandvik SAF 2507, Sandvik SAF 2707 HD, Sandvik SAF 3207 HD / TUBE, PIPE, FITTINGS AND FLANGES Manufacturers in SWEDEN |
http://www.tiogapipe.com/: TIOGA ( USA ) : Duplex Steel Pipe 2205 S31803/ S32205, A790 / SA790, Duplex Steel 2205 S31803 / S32205 , A815 / SA815, A182 / SA182 Fittings, Duplex Flanges Duplex 2205 S31803 / S32205, A182 / SA182 Manufacturers in Houston |
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Products | Duplex Steel Flanges, 2205and 2507 Grades. |
Industry We Serve | Duplex Stainless Steel Flanges Supplied Oil & Gas Industry, Petrochemical Companies, Seashore Industries, Refinery, Petroleum Refineries, Oil Refining Industry, Beverage, Water Piping Systems, Acid & Chemical Plants, Pharmacy Industry etc.. |
Country | More Then 2700 CLIENT OFDuplex Stainless Steel Flanges in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrainetc.... |
Products | Duplex Steel 2205and 2507 Pipe |
Industry We Serve | production & transportation of Oil & Gas : Duplex 2205 Stainless Steel Pipes for Industrial Use in Architecture, Building, Construction, Transportation, Chemical, Energy, Seaports, Seashore, Catering and Process Industry. |
Country | More Then 1900 CLIENTSof Duplex Stainless Steel Pipes & Tubes in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrain etc.... |
Products | Duplex Steel TubingSupplied to |
Industry We Serve | Heat exchangers Manufacturers & cooling pipes Manufacturers Industry. |
Country | More Then 1700 CLIENTS OFDuplex Stainless Steel Tubing in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrain etc.... |
Products | Duplex Steel Sheet & Plate |
Industry We Serve | storage tanks manufacturers, pharmaceutical or food processing Industry, pulp and paper industry (Duplex stainless steel plate USE: Duplex stainless steel plate is often used for storage tanks. High corrosion and erosion resistance is a must for storage tanks, whether the designer wants to prevent leakage during desalinization, avoid contamination in pharmaceutical or food processing, or store chips as well as black and white liquor for the pulp and paper industry.) |
Country | More Then 2800 CLIENTS OFDuplex Steel Plates., We Supplied Duplex Stainless Steel Plates in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrain etc.... |
Products | Duplex Steel 2205& 2507 Bolts, Duplex Steel 2205& 2507 Washer, Duplex Steel 2205& 2507 Screws, Duplex Steel 2205& 2507 Nuts |
Industry We Serve | Duplex Steel Fasteners used in Oil & Gas Industry, Petrochemical, structural & mechanical |
Country | More Then 3200 CLIENTS OFDuplex Stainless Steel Fasteners in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrain etc.... |
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