Jack Bolt is hydraulically tightened long studs with incorporated hydraulic connection which holds the upper keep of the main bearing intact. It does not pass through the main bearing keep housing but do hold the keep by utilizing hydraulic tension applied and maintained externally. Jack Bolts are scaled on the top of the upper keep, unlike conventional holding bolt which are set at side of the keep as they are passed through the hole provided on the housing for its stud.
It allows the tie rod to be placed nearer to the crank shaft center line, which eventually decreases the bending stresses of the engine on the cross girder.
Stainless Steel Jack Screws is a type of jack that is operated by turning a lead screw. It is usually used to lift moderately heavy weights, such as vehicles; to raise and lower the horizontal stabilizers of aircraft; and as adjustable supports for heavy loads, such as the foundations of houses. Jacking Screws consists of a heavy-duty vertical screw with a load table mounted on its top, which screws into a threaded hole in a stationary support frame with a wide base resting on the ground. On the head of the screw a rotating collar is there which has holes into which the handle, a metal bar, fits. When the handle is turned clockwise, the screw moves further out of the base by lifting the load resting on the load table. It is usually formed with acme threads in order to support large load forces.
Jack Bolts
Stainless Steel Jack Screws
Jacking Screws
DIN Standard | DIN |
Jack Bolts Size Inch |
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Jack Bolts Size Metric |
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Stainless Steel Jack Bolts Size |
Manufacturing M2, M3, M3.5, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M42, M45, M48 to M160 and Custom Metric Stainless Steel Jack Bolts |
SS Jack Bolts British standards |
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Standard | Manufacturer of Jack Bolts as per IS, ANSI, ASTM, DIN, ISO, JIS, GB, ASME, BS, UNI, CSN, EU, IFI, PN, and all International Standards
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Length | 3 mm to 200 mm |
Stainless Steel Jack Bolts US Threads | UNJC and UNJF threads, METRIC, BSW, BSF, Unified national coarse (UNC), Unified national extra fine (UNEF), UNK threads, UNR threads, Unified national fine (UNF), Constant-pitch threads |
UTS - Unified Thread Standard | UNEF, UNC, NPT, UNS, UNF, NPTF |
Dimensions | ASME B18.6.3 **Exception: Jack Bolts 6 inches and shorter are fully threaded. |
Head drive | Phillips/Slot, Phillips, Slotted, Six-Lobe, etc |
Jack Bolts Surface Finish | Zinc (yellow, blue, white, black), Dacroment, anodizing, plated zinc-nickel, Sherardized, nickel plated, Geometry, black oxide, Stainless steel: Passivated, Self-Colour, Hot Dip Galvanised (HDG), Mechanically Applied coating, Bright Zinc Plated (BZP), and some special one like DACROMET |
Finish/ Passivation of Stainless Steel Jack Bolts | Accordance to ASTM A380/A380M |
Manufacturing process of Jack Bolt | Insert tapping, Wire Drawing,Cold Heading, Heat Treatment, Inspection, Surface Plating, Packing |
Metric Jack Bolts Tolerances | +/-0.01mm to +/-0.05mm |
Material Origin | Stainless Steel Jack Bolts are Western European. Eastern origin possible on request. |
Stainless Steel Jack Bolts Surface Coating |
All Jack Bolts surface finishes can be supplied including Galvanised, Zinc, Sherardized, Dacromet, Electroless Nickel, Geomet & PTFE. |
Jack Bolts Surface treatment |
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Top Manufacturers | Omni, APL, Unbrako, Kundan, Deepak Fasteners, Sundaram Precision, Infasco, Caparo, EBY Fastener, SPAX® Screws, GKW Etc. |
Stainless Steel Jack Bolts marking and Packing |
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Delivery time | Regular product is about 7-15 days, custom product will according to special requirement |
Why Jignesh Steel? |
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MOQ | 5 pieces |
Free Samples | Yes |
Preferred Jack Bolts Drawing Formats | JPEG, PDF, CAD, STP, IGS |
Payment Terms | T/T, Western Union, Paypal, L/C or Trade Assurance 30% deposit & balance before shipping |
Common Jack Bolts material grades |
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Port of Dispatch | Mumbai or Kalamboli ports in Maharashtra state of India |
Ask for Test Certificates from Jack Bolts manufacturers |
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ISO - International Organization for Standardization |
Products | FOB Price US $ |
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Steel hardness Swiveling Jack Screw PT36-1217 serrated ball end bolt | US $2.80-$3.20/ Piece |
Custom Stainless Steel Hexagon Jack Screws | US $0.01-$0.70/ Piece |
Custom High Quality steel adjustable Jack screws | US $3.00-$25.00/ Piece |
PCB standoff Brass Jack Screw | US $0.02/ Piece |
Machine screw jack Cross Flat Head Screw DIN965 | US $0.02-$0.04/ Piece |
Adjustable Jack screw | US $0.06-$0.10/ Piece |
Hex Standoff Jack screw | US $15.00/ Piece |
OEM Screw Jack Screw 1610 | US $0.003-$0.01/ Piece |
Grade 8.8 M33 Jack Bolt | US $0.01/ Piece |
Stainless Steel Square Head Screw Jack for scaffolding | US $0.02/ Piece |
Call us or send us an email to sales@jigneshsteel.com for more details. Always compare our price with other Jack Bolts manufacturers in India or China
Machine Jack Cross Flat Head Screw
Hex Jack screw
Jack Screw
Grade 8.8 M33 Jack Bolt
Stainless Steel Square Head Screw Jack
Brass Jack Screw
Plain = QSC010
Case Hardened Steel
Zinc = QSC010- Z1
Jack Bolt Diameter | Width Across Flats | Width Across Corners | Head Height | |||
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Max | Min | Max | Min | Max | Min | |
10 | 0.188 | 0.180 | 0.265 | 0.247 | 0.148 | 0.134 |
1/4 | 0.25 | 0.241 | 0.354 | 0.331 | 0.196 | 0.178 |
5/16 | 0.312 | 0.302 | 0.442 | 0.415 | 0.245 | 0.224 |
3/8 | 0.375 | 0.362 | 0.530 | 0.497 | 0.293 | 0.270 |
7/16 | 0.438 | 0.423 | 0.619 | 0.581 | 0.341 | 0.315 |
1/2 | 0.500 | 0.484 | 0.707 | 0.665 | 0.389 | 0.361 |
9/16 | 0.562 | 0.545 | 0.795 | 0.748 | 0.437 | 0.407 |
5/8 | 0.625 | 0.606 | 0.884 | 0.833 | 0.485 | 0.452 |
3/4 | 0.750 | 0.729 | 1.060 | 1.001 | 0.582 | 0.544 |
7/8 | 0.875 | 0.852 | 1.237 | 1.170 | 0.678 | 0.635 |
1 | 1.00 | 0.974 | 1.414 | 1.337 | 0.774 | 0.726 |
1-1/8 | 1.125 | 1.096 | 1.591 | 1.505 | 0.870 | 0.817 |
1-1/4 | 1.250 | 1.219 | 1.768 | 1.674 | 0.966 | 0.908 |
1-3/8 | 1.750 | 1.342 | 1.945 | 1.843 | 1.063 | 1.00 |
1-1/2 | 1.500 | 1.464 | 2.121 | 2.010 | 1.159 | 1.091 |
Jackscrews for ASME B16.5 and B16.47 Series A flanges.
Size NPS (mm) |
Size NPS (inches) |
150# RF (dia Ø x L) |
300# RF (dia Ø x L) |
600# RF (dia Ø x L) |
900# RTJ (dia Ø x L) |
1500# RTJ (dia Ø x L) |
2500# RTJ (dia Ø x L) |
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25 | 1 | M20 x 130 | |||||
40 | 1 1/2 | M20 x 100 | M20 x 100 | M27 x 150 | |||
50 | 2 | M20 x 120 | M20 x 120 | M27 x 170 | |||
80 | 3 | M20 x 100 | M20 x 120 | M20 x 130 | M27 x 190 | ||
100 | 4 | M20 x 110 | M20 x 140 | M20 x 140 | M27 x 210 | ||
150 | 6 | M20 x 80 | M20 x 100 | M20 x 120 | M20 x 160 | M20 x 190 | M27 x 270 |
200 | 8 | M20 x 90 | M20 x 110 | M20 x 140 | M20 x 180 | M20 x 220 | M27 x 300 |
250 | 10 | M20 x 90 | M20 x 120 | M20 x 150 | M20 x 190 | M20 x 240 | M27 x 370 |
300 | 12 | M20 x 100 | M20 x 130 | M20 x 160 | M20 x 210 | M20 x 290 | M27 x 410 |
Size NPS (mm) |
Size NPS (inches) |
150# RF (dia Ø x L) |
300# RF (dia Ø x L) |
600# RF (dia Ø x L) |
900# RTJ (dia Ø x L) |
1500# RTJ (dia Ø x L) |
2500# RTJ (dia Ø x L) |
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350 | 14 | M20 x 110 | M20 x 140 | M20 x 170 | M20 x 230 | M20 x 310 | |
400 | 16 | M20 x 110 | M20 x 160 | M20 x 190 | M20 x 250 | M20 x 340 | |
450 | 18 | M20 x 120 | M20 x 160 | M20 x 200 | M20 x 280 | M20 x 370 | |
500 | 20 | M20 x 120 | M20 x 170 | M20 x 210 | M20 x 290 | M20 x 400 | |
550 | 22 | M20 x 140 | M20 x 180 | M20 x 220 | M20 x 340 | M20 x 440 | |
600 | 24 | M20 x 140 | M20 x 180 | M20 x 240 | M20 x 360 | M20 x 460 | |
650 | 26 | M20 x 140 | M20 x 180 | M20 x 250 | |||
700 | 28 | M20 x 140 | M20 x 190 | M20 x 250 | |||
750 | 30 | M20 x 160 | M20 x 200 | M20 x 270 |
Jack Bolts Size | 18-8 Stainless Steel Jack Bolts Torque in-lbs |
316 Stainless Steel Jack Bolts Torque in-lbs |
Silicon Bronze Jack Bolts in-lbs |
Monel Jack Bolts in-lbs |
Brass Jack Bolts in-lbs |
2024-T4 Aluminum Jack Bolts in-lbs |
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4-40 | 5.2 | 5.5 | 4.8 | 5.3 | 4.3 | 2.9 |
4-48 | 6.6 | 6.9 | 6.1 | 6.7 | 5.4 | 3.6 |
5-40 | 7.7 | 8.1 | 7.1 | 7.8 | 6.3 | 4.2 |
5-44 | 9.4 | 9.8 | 8.7 | 9.6 | 7.7 | 5.1 |
6-32 | 9.6 | 10.1 | 8.9 | 9.8 | 7.9 | 5.3 |
6-40 | 12.1 | 12.7 | 11.2 | 12.3 | 9.9 | 6.6 |
8-32 | 19.8 | 20.7 | 18.4 | 20.2 | 16.2 | 10.8 |
8-36 | 22 | 23 | 20.4 | 22.4 | 18.0 | 12.0 |
10-24 | 22.8 | 23.8 | 21.2 | 25.9 | 18.6 | 13.8 |
10-32 | 31.7 | 33.1 | 29.3 | 34.9 | 25.9 | 19.2 |
1/4-20 | 75.2 | 78.8 | 68.8 | 85.3 | 61.5 | 45.6 |
1/4-28 | 94 | 99 | 87 | 106 | 77 | 57 |
5/16-18 | 132 | 138 | 123 | 149 | 107 | 80 |
5/16-24 | 142 | 147 | 131 | 160 | 116 | 86 |
3/8-16 | 236 | 247 | 219 | 266 | 192 | 143 |
3/8-24 | 259 | 271 | 240 | 294 | 212 | 157 |
7/16-14 | 376 | 393 | 349 | 427 | 317 | 228 |
7/16-20 | 400 | 418 | 371 | 451 | 327 | 242 |
Jack Bolts Bolt Size | 18-8 Stainless Steel Jack Bolts Torque ft-lbs |
316 Stainless Steel Jack Bolts Torque ft-lbs |
Silicon Bronze Jack Bolts ft-lbs |
Monel Jack Bolts ft-lbs |
Brass Jack Bolts ft-lbs |
2024-T4 Aluminum Jack Bolts ft-lbs |
1/2-13 | 43 | 45 | 40 | 48.7 | 35.2 | 26 |
1/2-20 | 45 | 47 | 42 | 51 | 37 | 27 |
9/16-12 | 56 | 59 | 53 | 65 | 47 | 34 |
9/16-18 | 62 | 65 | 58 | 71 | 51 | 38 |
5/8-11 | 92 | 96 | 86 | 111 | 76 | 60 |
5/8-18 | 103 | 108 | 96 | 123 | 85 | 67 |
3/4-10 | 127 | 131 | 118 | 153 | 104 | 82 |
3/4-16 | 124 | 129 | 115 | 149 | 102 | 80 |
7/8-9 | 194 | 202 | 178 | 231 | 159 | 124 |
7/8-14 | 193 | 201 | 177 | 230 | 158 | 124 |
1 - 8 | 286 | 299 | 265 | 344 | 235 | 184 |
1 - 14 | 259 | 270 | 240 | 311 | 212 | 166 |
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