Although stainless steel alloys typically have great strength and excellent corrosion resistance, surface treatment can be used to improve these qualities. For instance, the Indian maker of lag bolts can galvanise them to increase their hardness and corrosion resistance. Any type of galvanised lag bolt and a stainless steel lag bolt differ primarily in that the former has a layer of zinc applied to its surface.
Bolts that have been galvanised provide a higher level of protection compared to those that have been electroplated because the finish applied to 3/8 stainless steel lag bolts during galvanization is significantly thicker than it is during electroplating. Additionally, the stainless steel lag bolt strength is increased as a result of the zinc coating that is applied to these components, which also protects the fastener from corrosive media. The benefit of galvanising the material is that the component, in this example the 1/2 x 6 stainless steel 316 lag eye screw, will not corrode as easily, particularly by oxidation, which is the most prevalent source of corrosion.
However, using an alloy grade to create a 1/2 x 6 stainless steel lag eye bolt with a substantially greater chromium content could further slow the rate of oxidation. One such alloy is grade 316, with its entire alloy weight containing 16.5 percent chromium. The stainless steel lag eye bolt with ring can create a thick passivate oxide layer with a chromium concentration of over 14% that shields the fasteners from oxidation corrosion.
Lag Bolts
| standards of British | BS 57 |
|---|---|
| standards | ISO 7045, DIN 7985, DIN 571 |
| Length | 1.2 milimeter, 2 milimeter, 45 milimeter, 1 milimeter |
| Size |
M16, M5, M33, (M3.5), (M45), M20, M42, M4, (M22), (M27), (M14), M6, (M18), M36, M48, M12, M2, M3, M10, M24, M30, M8 M160 and as per need |
| Standard: |
all International Standards and ASTM, ANSI , ISO, DIN, GB, JIS, BS, IS |
| Threads | BSW, METRIC, UNC, BSF, UNF or as per need |
| UTS | UNF, NPT, UNC, UNS, UNEF, NPTF |
| DIN Standard | DIN 7981, DIN 931, B.S. DIN 933, DIN 912, DIN 934, DIN 603, DIN 970, DIN916, DIN 7982, DIN 7985, DIN 913, DIN 6923, |
| Tolerance | +/- 00.01 millimeter to +/- 00.05 millimeter |
| Dimensions of socket head bolts | ASME B18.6.3:: shorter are fully threaded and 6 inches screws |
| Type | Round/ Pan/ Truss head/ Hex Head/ Oval |
| Drive | Phillips/Slot, Phillips, Slotted, Six-Lobeetc |
| Finishing |
|
| Head | flat, hex, oval, phillips,Pan head |
| process of Production | Cold Heading, Wire Drawing, Heat Treatment, Insert tapping, Inspection, Packing, Surface Plating |
| Finish | ASTM A380/A380M |
| Manufacturers | GKW, SPAX® Screws, Kundan, Unbrako, Sundaram Precision, APL, EBY Fastener , Infasco Etc. |
| treatment of Surface |
|
| Uses | Wind tower, Railway, Automotive industry, Nuclear power, Electronic industry, Construction |
| Certificate provided |
|
| Description | lag bolts Price |
|---|---|
| Stainless Steel Lag Eye Bolt | US $ 0.6 / Piece |
| Lag Bolt 8.8 Fastener Round Head Carriage Bolt M12 | US $ 0.01-0.04 / Piece |
| M8 Lag Bolt 10mm Hex Bolt 4.8 |
US $ 0.01-0.04 / Piece Min. Order: 10 Pieces |
| Customized Stainless Steel Penta Head Wood Coach Screws Lag Bolts | US $ 0.01-0.1 / Piece |
| Zp ASME B18.2.1 Mild Steel Lag Bolts |
US $ 0.1-5 / Piece |
| Full Thread Half Thread Lag Bolt Stainless Steel | Min. Order: 10000 Pieces |
| DIN571 Hex Head Lag Screw Wood Screw Lag Bolt with Zinc Plated | US $ 0.008-0.009 / Piece |
| SS304/Stainless Steel 304 A2-70 Hex/Hexagon Head Wood Coach Screws Lag Bolts | US $ 850 / KG |
| Stainless Steel DIN580 Lifting Ring Lag Screw Eye Bolt |
US $ 0.5-0.8 / Piece |
| Carbon Steel Mushroom Head Big Lag Bolt | US $ 5 / Piece |
| Nominal Size | Head Width | Threads per Inch |
Head Height |
||
|---|---|---|---|---|---|
| Across Corners |
Across Flats |
||||
| Decimal | Fraction | Avg | Basic | Basic | |
| 0.3125 | 5/16 | 9/16 | 1/2 | 9 | 7/32 |
| 0.2500 | 1/4 | 1/2 | 7/16 | 10 | 11/64 |
| 0.4375 | 7/16† | 45/64 | 5/8 | 7 | 19/64 |
| 0.3750 | 3/8 | 41/64 | 9/16 | 7 | 1/4 |
| 0.6250 | 5/8 | 1 1/16 | 15/16 | 5 | 27/64 |
| 0.5000 | 1/2 | 27/32 | 3/4 | 6 | 11/32 |
| 0.7500 | 3/4 | 1 17/64 | 1 1/8 | 4 1/2 | 1/2 |
| Nominal Screw Size | Nominal Screw Length | |
|---|---|---|
| Over 6 in | Up to 6 in | |
| Over 1/2 | +/- 0.25 | +/- 0.25 |
| 1/2 and smaller |
+/- 0.25 | +/- 0.12 |
| Bolt Size | Pilot Hole Size | |||
|---|---|---|---|---|
| Body | Threaded Section | |||
| Medium Wood Group II |
Soft Wood Groups III & IV |
Hard Wood Group I |
||
| 5/16 | 5/16 | 3/16 | 9/64 | 13/64 |
| 1/4 | 1/4 | 5/32 | 3/32 | 3/16 |
| 7/6† | 7/16 | 9/32 | 13/64 | 19/64 |
| 3/8 | 3/8 | 15/64 | 11/64 | 1/4 |
| 5/8 | 5/8 | 13/32 | 5/16 | 29/64 |
| 1/2 | 1/2 | 5/16 | 15/64 | 11/32 |
| 3/4 | 3/4 | 1/2 | 13/32 | 9/16 |
The difference between lag bolts and lag screws is nonexistent. Both are referred to as lag screws. Longer screws or bolts have a shoulder, which is a space between the head and the threads. Bolts are a type of threaded fastener that can be used with a nut.
Screw Diameter |
Threads per Inch |
Head Height (H) | Width Across Flats (F) | Washer Diameter (C) | Washer Thickness | Major Diameter | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Minimum | Maximum | Minimum | Maximum | Minimum | Maximum | Minimum | Maximum | Minimum | Maximum | ||
| 5/16 | 9 | .200 | .230 | .429 | .437 | .610 | .625 | .050 | .060 | .298 | .324 |
| 1/4 | 10 | .172 | .190 | .429 | .437 | .610 | .625 | .050 | .060 | .237 | .260 |
| 5/16-High Head | 9 | .300 | .312 | .429 | .437 | .610 | .625 | .050 | .060 | .298 | .324 |
| LENGTHS | #3 | #2 | #5 | #4 | #8 | #6 | #12 | #10 | 5/16″ | 1/4″ | 3/8″ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/8 | 0.055 | 0.040 | 1.01 | 0.070 | — | 1.04 | — | — | — | — | — |
| 3/16 | 0.070 | 0.050 | 1.02 | 0.090 | 2.05 | 1.05 | — | 3.09 | — | — | — |
| 1/4 | 0.080 | 0.060 | 1.04 | 1.000 | 2.08 | 1.07 | 5.06 | 4.03 | — | 8.05 | — |
| 5/16 | 0.090 | 0.060 | 1.05 | 1.020 | 3.01 | 1.09 | 6.01 | 4.06 | 16.07 | 9.01 | — |
| 3/8 | 0.090 | 0.070 | 1.07 | 1.030 | 3.04 | 2.01 | 6.05 | 5.00 | 17.07 | 9.08 | 29.02 |
| 7/16 | 1.000 | 0.080 | 1.09 | 1.050 | 3.06 | 2.02 | 6.09 | 5.04 | 18.08 | 10.04 | 30.07 |
| 1/2 | 1.010 | 0.080 | 2.00 | 1.060 | 3.09 | 2.04 | 7.04 | 5.08 | 19.08 | 11.01 | 32.02 |
| 9/16 | 1.020 | 0.090 | 2.02 | 1.070 | 4.02 | 2.06 | 7.08 | 6.02 | 20.09 | 11.07 | 33.06 |
| 5/8 | 1.030 | 1.000 | 2.03 | 1.080 | 4.05 | 2.08 | 8.03 | 6.06 | 21.09 | 12.04 | 35.01 |
| 3/4 | 1.050 | 1.010 | 2.06 | 2.010 | 5.00 | 3.02 | 9.02 | 7.03 | 24.00 | 13.06 | 38.00 |
| 7/8 | 1.070 | 1.030 | 3.00 | 2.030 | 5.06 | 3.05 | 10.01 | 8.01 | 26.01 | 14.09 | 41.00 |
| 1″ | 1.090 | 1.040 | 3.04 | 2.050 | 6.02 | 3.09 | 11.00 | 8.09 | 28.08 | 16.01 | 44.00 |
| 1-1/8″ | 2.000 | 1.050 | 3.08 | 2.080 | 6.07 | 4.03 | 11.09 | 9.06 | 30.02 | 17.04 | 47.00 |
| 1-1/4″ | 2.020 | 1.060 | 4.01 | 3.000 | 7.03 | 4.06 | 12.08 | 10.04 | 32.03 | 18.07 | 49.08 |
| 1-1/2″ | 2.050 | 1.080 | 4.07 | 3.050 | 8.03 | 5.03 | 14.07 | 11.09 | 36.05 | 21.02 | 55.08 |
| 1-3/4″ | 2.090 | 2.010 | 5.03 | 4.000 | 9.04 | 6.01 | 16.05 | 13.05 | 40.07 | 23.07 | 61.07 |
| 2″ | 3.030 | 2.040 | 6.00 | 4.050 | 10.06 | 6.08 | 18.03 | 15.00 | 44.08 | 26.02 | 67.06 |
| 2-1/4″ | 3.060 | 2.060 | 6.07 | 5.000 | 11.08 | 7.06 | 20.01 | 16.06 | 19.00 | 28.08 | 73.05 |
| 2-1/2″ | 3.090 | 2.080 | 7.03 | 5.050 | 12.09 | 8.03 | 22.00 | 18.01 | 53.02 | 31.03 | 79.05 |
| 2-3/4″ | 4.030 | 3.010 | 7.09 | 6.000 | 13.09 | 9.01 | 23.08 | 19.07 | 57.03 | 33.09 | 85.03 |
| 3″ | 4.070 | 3.040 | 8.06 | 6.050 | 15.00 | 9.08 | 25.06 | 21.02 | 61.05 | 36.04 | 91.03 |
| Description | length | diameter |
|---|---|---|
| 1/4 X 1 Zinc Plated Carbon Steel Hex Lag Screws | 1 | 1/4 |
| 1/4 X 1 Galvanized Carbon Steel Hex Lag Screws | 1 | 1/4 |
| 1/4 X 1 1/2 Zinc Plated Carbon Steel Hex Lag Screws |
1 1/2 | 1/4 |
| 1/4 X 1 1/4 18-8 Stainless Steel Hex Lag Screw | 1 1/4 |
1/4 |
| 1/4 X 1 3/4 18-8 Stainless Steel Hex Lag Screw |
1 3/4 | 1/4 |
Material |
Grades |
ASTM Standards |
|---|---|---|
Alloy Steel |
B 7/ B 7M, B 6, 2, B 16, 2H, 2HM, B 7, GR 6, B 7M |
ASTM A 194/193 / ASME SA 194/193 GR |
Nickel Alloy |
UNS 8020 (ALLOY 20 / 20 CB 3), UNS 4400 (MONEL 400), UNS 2200 (NICKEL 200) , UNS 6600 (INCONEL 600) , UNS 8825 (INCONEL 825), UNS 10276 (HASTELLOY C 276), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 2201 (NICKEL 201) |
ASTM / ASME SB 164 /160 / 166 /425 / 574 / 446 / 472 |
Stainless Steel |
B 8C (SS 347), A 4, B 8 (304), A 2, B 8 T (SS 321), (SS 316) B 8M |
ASTM A 194/193 / ASME SA 194/193 |
Duplex Steel |
LENGTH: 5 METERS, size Range: M10 - M100 |
UNS NO. S32205, S31803 |
High-Temprature Alloys |
19-9 DL, Discaloy, A286, Nimonic 80, Titanium, Haynes 25, Mulitmet, 16-25-6, Unitemp 252, Greek Ascalloy, Rene 41, Udimet 500, Inco 901, Inco 700, 235, Hastelloy X, RA 330, Waspaloy | |
Finish: |
Zinc Plating, Black Oxide, Hot Dip Galvanized | |
Trademarks: |
Armco, Carpenter, DuPont, Cabot, INCO | |
Nonmetallic Materials: |
Kel-F, Acrylic, Lexan, Poly Vinyl Chloride, Polypropylene, Zytel 31, 105, 101, Teflon | |
Aluminum Alloys: |
5052, 2024, 3003, 2011, 6061, 2014, 6053, 7075, 2017, 1100 | |
Copper Base Alloys |
Silicon A and B, Free-cut, Yellow, Naval, Red, Bronze: Phosphor, Commercial, Aluminum, Manganese, Silicon-Aluminum, Munitz Metal, Ampco Alloys, Cupro-Nicles | |
| Dammam -KSA, Philippines, Indonesia, Belgium | 316 Stainless Steel Wood Screws Hex Head Lag Bolts |
| Qatar, Europe, France, Thailand | Carbon Steel Mushroom Head Big Lag Bolts Round Head Big Bolts |
| Czechia, Thailand, Germany, Malaysia | DIN603 Ss 304 Square Head / Mushroom Head Lag Bolts |
| Malaysia, Bangladesh, USA, Finland | Zinc Plated Steel Lag Screw Eye Bolts with Nut, Eyelet Bolts |
| South Africa, Kuwait, Saudi Arabia (KSA), Brazil | Grade2/A307 Gr. a Hex Lag Bolts |
| Bahrain, Singapore, South Africa | Long Carbon Steel Hex Lag Screw |
| Philippines, UK, Australia, Nigeria | Galvanized Wood Screw DIN 571 Lag Bolts |
| Oman, Hong Kong, Malaysia, UAE | Mild Steel Hex Lag Bolts |
| Chile, Iran, Italy, Singapore | Stainless Steel 304 Lag Bolts |
| United Arab Emirates (UAE), Norway, Turkey, Malaysia | Stainless Steel Lag Eye Bolts |
| Netherlands, Russia, Malaysia, Dubai | Zinc Plated Steel Hex Head Lag Bolts |
| Egypt, Mexico, Spain, UK | Stainless Steel Lag Ring Bolts |
| United Kingdom -UK, Malaysia, Europe, UAE | High Strength DIN571 Zinc Plated Lag Bolts |
| UK, Poland, Canada, Ellington -United States | 10.9 Carbon Steel DIN 571 Zinc Plated Hex Lag Bolts |
| Philippines, Canada, Malaysia, Singapore | Carbon Steel Mushroom Head Big Lag Bolts |
| Europe, Romania, Japan, Malaysia | Stainless Steel Wood Screw Lag Thread Swivel Bolts Eye Bolts |
| Sweden, Malaysia, Colombia, China | Galvanized Hex Lag Bolts |
| Malaysia, Los Alamos -Mexico, Taiwan, Philippines | Stainless Steel Square Lag Bolts |
| Singapore, NY 12203 (USA), South Korea, Malaysia | Custom Nut Hexagon Lag Stainless Steel Flange Bolts |
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