Jam nutsare thin hex nuts usually used as a second nut that is "jammed" (tightened) against a full size nut or alone as a thin nut. They are used to "lock" turnbuckles and control linkages, like steering tie rods, after adjustment. Hex is short for hexagon, which means they have six sides. Jam nuts are also known as:
(even though they are referred to as half height, they are really two-thirds height). Jam nuts are used without lock washers when jammed against another nut, and may be used with lock washers when installed as a single nut.
When used in a "jam" configuration, the jam nut is installed first and contacts the mating surface. The full size nut is installed second and contacts the jam nut. Although this may be the generally accepted practice, there is still controversy as to which nut should be installed first. In addition, there is concern that the two nuts will not be equally torqued so one may yield before the other. If tension load is critical, one source suggests using a single lock nut instead.
Threads are standard right-hand and Unified inch coarse series (UNC, Unified National Coarse) or Unified inch fine (UNF, Unified National Fine).
Jam nut size refers to its nominal thread diameter. Typically, sizes range from 1/4" to about 2 1/2". Size is specified in inches, usually fractional rather than decimal. Table 1 lists width across flats and across corners, and thickness. Not all types are available in all sizes.
Width across flats, which is wrench size, ranges from 1.50 to 1.75 times the nominal jam nut size and thickness is 0.542 to 0.625 times the size, which is two-thirds the thickness of a standard nut. Nuts that are 5/8" and smaller are double (top and bottom) chamfered (beveled); larger sizes may be double chamfered or have a washer face bearing (bottom) surface and a chamfered top.
Unlike materials such as stainless steel and brass, steel jam nuts are available in different strength "grades" as designated by the SAE (Society of Automotive Engineers). Grade 2 is the lowest, in terms of both strength and cost; and Grade 8 is the highest SAE grade and is usually priced the highest as well. Never replace a graded jam nut with a lower grade or lower strength nut. Surface markings identify the grade.
Common materials include steel (unplated and plated—see more about finishes below), stainless steel and brass. Steel remains the least costly material followed by stainless steel; copper alloys (such as brass) are the most expensive.
A common finish for steel is zinc plating. Zinc, the most popular and least expensive commercial plating, offers moderate corrosion resistance. Stainless steel, though, is a better choice when corrosion is of concern except when submerged in salt water without free oxygen where it can suffer from severe pitting corrosion. Unplated and uncoated steel jam nuts—referred to as plain finish—may also be available and are susceptible to rust.
Always follow the manufacturer's recommendations regarding nut reuse, thread lubricants/locking compounds and torque values.
It is advisable to match materials and finishes of jam nuts, washers and bolts/screws.
Stainless steel jam nuts and bolts/screws used together are susceptible to thread galling and seizing. While it may not be completely preventable, it can be substantially reduced. A thread lubricant is the most effective method. Alternatively, stainless steel alloys having different hardnesses—like a 316 nut and a 304 bolt/screw—have less tendency to gall.
If you need a thicker nut, choose a hex nut. For a wider and thicker nut, consider a heavy hex nut.
Refer to ASME B18.2.2 for specifications relating to jam nuts.
Jam Nut Dimensions | |||
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Nut Size | Width | Thickness | |
Across Flats | Across Corners | Basic | |
1/4 | 7/16 | 1/2 | 5/32 |
5/16 | 1/2 | 9/16 | 3/16 |
3/8 | 9/16 | 41/64 | 7/32 |
7/16 | 11/16 | 25/32 | 1/4 |
1/2 | 3/4 | 55/64 | 5/16 |
9/16 | 7/8 | 1 | 5/16 |
5/8 | 15/16 | 1 1/16 | 3/8 |
3/4 | 1 1/8 | 1 17/64 | 27/64 |
7/8 | 1 5/16 | 1 31/64 | 31/64 |
1 | 1 1/2 | 1 11/16 | 35/64 |
1 1/8 | 1 11/16 | 1 29/32 | 39/64 |
1 1/4 | 1 7/8 | 2 7/64 | 23/32 |
1 3/8 | 2 1/16 | 2 21/64 | 25/32 |
1 1/2 | 2 1/4 | 2 17/32 | 27/32 |
Jam Nut Dimensions | |||
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Nut Size | Width | Thickness | |
Across Flats | Across Corners | Basic | |
1/4 | 7/16 | 1/2 | 5/32 |
5/16 | 1/2 | 9/16 | 3/16 |
3/8 | 9/16 | 41/64 | 7/32 |
7/16 | 11/16 | 25/32 | 1/4 |
1/2 | 3/4 | 55/64 | 5/16 |
9/16 | 7/8 | 1 | 5/16 |
5/8 | 15/16 | 1 1/16 | 3/8 |
3/4 | 1 1/8 | 1 17/64 | 27/64 |
7/8 | 1 5/16 | 1 31/64 | 31/64 |
1 | 1 1/2 | 1 11/16 | 35/64 |
1 1/8 | 1 11/16 | 1 29/32 | 39/64 |
1 1/4 | 1 7/8 | 2 7/64 | 23/32 |
1 3/8 | 2 1/16 | 2 21/64 | 25/32 |
1 1/2 | 2 1/4 | 2 17/32 | 27/32 |
Nominal Size or Basic Major Thread Diameter | F | G | H | ||||||
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Width Across Flats | Width Across Corners | Thickness | |||||||
Basic | Max | Min | Max | Min | Basic | Max | Min | ||
1/4 | .2500 | 7/16 | .438 | .428 | .505 | .488 | 5/32 | .163 | .150 |
5/16 | .3125 | 1/2 | .500 | .489 | .577 | .557 | 3/16 | .195 | .180 |
3/8 | .3750 | 9/16 | .562 | .551 | .650 | .628 | 7/32 | .227 | .210 |
7/16 | .4375 | 11/16 | .688 | .675 | .794 | .768 | 1/4 | .260 | .240 |
1/2 | .5000 | 3/4 | .750 | .736 | .866 | .840 | 5/16 | .323 | .302 |
9/16 | .5625 | 7/8 | .875 | .851 | 1.010 | .982 | 5/16 | .324 | .301 |
5/8 | .6250 | 15/16 | .938 | .922 | 1.093 | 1.051 | 3/8 | .387 | .363 |
3/4 | .7500 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 27/64 | .446 | .398 |
7/8 | .8750 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 31/64 | .510 | .458 |
1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 35/64 | .575 | .519 |
1-1/8 | 1.1250 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 39/64 | .639 | .579 |
1-1/4 | 1.2500 | 1/7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 23/32 | .751 | .687 |
1-3/8 | 1.3750 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 25/32 | .815 | .747 |
1-1/2 | 1.5000 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 27/32 | .880 | .808 |
1-3/4 | 1.7500 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 31/32 | 1.009 | .929 |
2 | 2.0000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-3/32 | 1.138 | 1.050 |
2-1/4 | 2.2500 | 3-1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 1-13/64 | 1.251 | 1.155 |
2-1/2 | 2.5000 | 3-7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 1-29/64 | 1.505 | 1.401 |
Description | A six sided internally threaded fastener which is only 2/3 he thickness of a full form nut. |
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Applications & Advantages | Jam nuts are tightened against the work surface and a heavy hex nut is tightened against the jam nut to keep it from loosening. |
Material | Steel: Nuts shall be made from a low carbon steel which conforms to the following chemical composition requirements: Phosphorus: .12% maxCarbon: .47% max Sulfur: .23% max Stainless: Nuts shall be made from one of the following austenitic stainless alloys" 303, 303SE, 304 or XM7, all of which have a chromium content of 18% and a nickel content of 8%. |
Heat Treatment | The austenitic alloys develop their strength through work hardening during the manufacturing process, as seen from their hardness properties below. The only heat treatment normally available on austenitic stainless steel alloys is annealing, which is done at approximately 1900°F to a dead soft condition and is not normally thermally reversible. |
Core Hardness | Steel: Rockwell B68 - C32 Stainless: Rockwell B95 - C32 |
Proof Load | Steel: Course thread: 54,000 psi Fine Thread: 48,000 psi Stainless: 1/4 thru 1/2 inch - 60,000 psi |
Duplex Steel 2205 Nuts Available Types |
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 | ||
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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 | ||
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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 Nuts 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 - |
http://www.jindalstainless.com/ : JINDAL ( JSL INDIA ): Duplex Steel Sheet PlatesManufacturers --- |
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 --- |
http://www.specialsteelgroup.com/: SPECIAL STEEL LTD(UK): Duplex Stainless Steel Round Bar, Fastener Bolts Nuts & Flat Bar Manufacturers |
http://www.pennstainless.com/: PENN STAINLESS( USA ) : Duplex Stainless Steel 2205& 2507 : Penn Stainless inventory now includes Duplex 2205 (UNS S32205 / S31803), in sheet, coil, plate, plate coil, round bar, processed flat bar and tubular products |
http://www.nssmc.com/en/ : NIPPON STEEL & SUMITOMO METALS( JAPAN ) : Duplex Steel 2205& 2507 Sheet Plates Manufacturers --- |
http://www.outokumpu.com/: OUTOKUMPU ( FINLAND & INDIA ) : Duplex Steel 2205 & 2507 Coil and sheet, Bar, Welded pipe & Plate Manufacturers --- |
http://megamex.com/: MEGAMEX ( TEXAS USA ) : Mega Mex supplies LDX2101, 2205, Ferralium 255, Zeron 100 and 2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire. |
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 |
http://www.specialpipingmaterials.com/duplex/: SPECIAL PIPING MATERIAL ( UK, ENGLAND, SCOTLAND, SINGAPORE, USA, AUSTRALIA, DUBAI, BRAZIL ) : High quality exotic piping products from approved manufacturers : Seamless Duplex 2205 Pipe, Welded Super Duplex Pipe, Super Duplex (both S32760 and S32750 / 2507 Buttweld Fittings, Flanges, Forged Fittings Manufacturers |
http://www.langleyalloys.com/ : Langley Alloys : Duplex Stainless Steels Products Manufacturers |
http://www.rolledalloys.com/: Rolled Alloys, Inc: Duplex Stainless Steel Pipes TubesManufacturers |
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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