Flexloc Nut is an outstanding self-locking nut. It is one piece; all metal construction which holds up under maximum temperatures, shock and vibration. Because a Flexloc has no nylon insert, it constantly offer better tensile strength than the leading “two-element” locknuts and it is perfect for high temperature environments. The slotted locking feature is the real secret of Flex Lock Nut. As the bolt captures the locking feature, the slotted section enlarges, initiating the locking action. This enlargement lifts the nut upward by causing the threads to support against the lower surface of the bolt threads. Once it is fully engaged thread offers a load-carrying capacity which results in a lower more constant distribution of stress per thread. This locking feature and the flex top lock nut all-metal construction combine to provide superior vibration resistance.
It has imitators but not equal for durability, strength, and overall value, it is the supreme industrial locknut. The full height locknut offers up to 19% more tensile strength than the leading nylon insert and 26% more strength than all competitive metal of locknut of equal size. The thin height locknut which offers effectively twice as much tensile strength as the leading nylon insert locknut offers.
Flexloc Nut
Stainless Steel Flex Lock Nut
Flex Lock Nut
DIN Standard of Flexloc Nut | DIN 7967 |
British standards of Flexloc Nut | BS 57 |
Stainless Steel Flexloc Nut Size | M2-M24 |
Flexloc Nut Size Metric |
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Flexloc Nut Size Inch |
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Standard |
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Stainless Steel Flexloc Nut US Threads | BSW, UNK, Constant-pitch threads, UNR, BSF, Unified National Coarse (UNC), UNJC, METRIC, Unified national extra fine (UNEF), UNJF, Unified national fine (UNF) |
UTS - Unified Thread Standard | UNC, UNF, NPT, UNS, UNEF, NPTF Flexloc Nut manufacturers in India |
SS Flexloc Nut Dimensions | ASME B 18.2.2 |
Metric Flexloc Nut Tolerances | +/-0.01mm to +/-0.05mm |
Flexloc Nut Surface Finish | Geometry, Self-Colour, black oxide, Dacroment, Plated zinc-nickel, Zinc, Hot Dip Galvanised (HDG), Stainless Steel Passivated, Bright Zinc Plated (BZP), Anodizing, Sherardized, Nickel plated |
Material Origin | Stainless Steel Flexloc Nut are Western European. Eastern origin possible on request. |
Finish/ Passivation of Stainless Steel Flexloc Nut | Accordance to ASTM A380/A380M |
Stainless Steel Flexloc Nut Surface Coating |
All Flexloc Nut surface finishes can be supplied including Galvanised, Zinc, Sherardized, Dacromet, Electroless Nickel, Geomet & PTFE. |
Flexloc Nut Surface treatment |
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Stainless Steel Flexloc Nut marking and Packing |
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Why Jignesh Steel? |
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MOQ | 5 pieces |
Delivery time | Regular product is about 7-15 days, custom product will according to special requirement |
Preferred Flexloc Nut Drawing Formats | JPEG, PDF, CAD, STP, IGS |
Test Certificates provided by Flexloc Nut manufacturers |
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Free Samples | Yes |
Payment Terms | T/T, Western Union, Paypal, L/C or Trade Assurance 30% deposit & balance before shipping |
Common Flexloc Nut material grades |
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Port of Dispatch | Mumbai or Kalamboli ports in Maharashtra state of India |
Flexloc Nut Application and Uses | Industrial, Wind tower, Railway, Nuclear power, Construction, Electronic, and Automotive indutries, these end users prefer to buy from Flexloc Nut manufacturers in India |
Other Fasteners | |
ISO - International Organization for Standardization |
Products | FOB Price US $ |
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5/8-11 Coarse Thread Flexloc Nut Thin Light Hex Medium Carbon Steel CAD Plated | US $7.3400/ pcs |
#10-24 50FA-1024 Flexloc Nut Light Hex Full Stainless Steel 18-8 Coarse Thread | US $1.7756/ pcs |
#10-32 Flexloc Nut Light Hex Thin Stainless Steel 18-8 50FK-1032 Fine Thread | US $2.0515/ pcs |
1-8 Flexloc Nut Heavy Hex Thin Medium Carbon Plain Finish 30FK-1608 Coarse Thread | US $20.8360/ pcs |
1/2-13 Flexloc Nut Heavy Hex Full Medium Carbon Steel CAD Plated 21FA-813 Coarse Thread | US $5.4060/ pcs |
1/2-13 Flexloc Nut Heavy Hex Thin Stainless Steel 18-8 50FK-813 Coarse Thread | US $17.8120/ pcs |
1/4-20 Flexloc-Alternative Nut Thin Height Light Hex Stainless Steel 18-8 Coarse Thread | US $1.3657/ pcs |
Call us or send us an email to sales@jigneshsteel.com for more details.
Nominal Size | F | G | H | I | |
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Across Flats | Across Corner | Height | Side Height | ||
Max | Min | ||||
2-56 | .251 | .243 | .268 | .155 | .050 |
3-48 | .251 | .243 | .268 | .155 | .050 |
4-40 | .251 | .243 | .268 | .155 | .050 |
4-48 | .251 | .243 | .268 | .155 | .050 |
5-40 | .251 | .243 | .268 | .155 | .052 |
5-44 | .251 | .243 | .268 | .155 | .052 |
6-32 | .313 | .305 | .339 | .180 | .075 |
6-40 | .313 | .305 | .339 | .180 | .075 |
8-32 | .345 | .336 | .339 | .243 | .105 |
8-36 | .345 | .336 | .374 | .243 | .105 |
10-24 | .376 | .367 | .374 | .243 | .085 |
10-32 | .376 | .367 | .410 | .243 | .085 |
12-24 | .439 | .430 | .410 | .290 | .122 |
12-28 | .439 | .430 | .482 | .290 | .122 |
1/4-20 | .439 | .430 | .482 | .290 | .122 |
1/4-28 | .439 | .430 | .482 | .320 | .135 |
5/16-18 | .502 | .492 | .552 | .353 | .150 |
5/16-24 | .502 | .492 | .552 | .353 | .150 |
3/8-16 | .564 | .553 | .622 | .462 | .210 |
3/8-24 | .564 | .553 | .622 | .462 | .210 |
7/16-14 | .627 | .616 | 0696 | .462 | .210 |
7/16-20 | .627 | .616 | .696 | .462 | .210 |
1/2-13 | .752 | .741 | .837 | .602 | .285 |
1/2-20 | .752 | .741 | .837 | .602 | .285 |
9/16-12 | .877 | .865 | .978 | .696 | .385 |
9/16-18 | .877 | .865 | .978 | .696 | .385 |
5/8-11 | .940 | .928 | 1.051 | .759 | .410 |
5/8-18 | .940 | .928 | 1.051 | .759 | .410 |
3/4-10 | 1.064 | 1.052 | 1.191 | .884 | .505 |
3/4-16 | 1.064 | 1.052 | 1.191 | .884 | .505 |
7/8-9 | 1.252 | 1.239 | 1.403 | 1.009 | .570 |
7/8-14 | 1.252 | 1.239 | 1.403 | 1.009 | .570 |
1-8 | 1.440 | 1.427 | 1.615 | 1.134 | .635 |
1-12 | 1.440 | 1.427 | 1.615 | 1.134 | .635 |
1-14 | 1.440 | 1.427 | 1.615 | 1.134 | .635 |
1-1/8-12 | 1.627 | 1.614 | 1.826 | 1.259 | 0710 |
1-1/4-12 | 1.814 | 1.801 | 2.038 | 1.449 | .795 |
1-3/8-12 | 2.002 | 1.988 | 2.269 | 1.509 | .815 |
1-1/2-12 | 2.190 | 2.176 | 2.484 | 1.759 | .970 |
1-3/4-12 | 2.752 | 2.737 | 3.124 | 2.010 | 1.124 |
1-7/8-12 | 2.940 | 2.925 | 3.338 | 2.140 | 1.190 |
2-12 | 3.127 | 3.112 | 3.552 | 2.260 | 1.260 |
Flexloc Nut Grade Identification Marking |
Flexloc Nut Specification | Flexloc Nut Material | Nominal Size ub Inches | Flexloc Nut Proof Load Stress ksi |
Hardness Rockwell |
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Min | Max | |||||
![]() No Mark |
ASTM A563 - Grade 0 |
Carbon Steel |
1/4 thru 1-1/2 |
69 | B55 | C32 |
ASTM A563 - Grade A |
Carbon Steel |
1/4 thru 1-1/2 |
90 | B68 | C32 | |
ASTM A563 - Grade B Flexloc Nut | Carbon Steel | 1/4 thru 1 | 120 | B69 | C32 | |
over 1 thru 1-1/2 |
105 | |||||
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ASTM A563 - Grade C |
Carbon Steel May be Quenched and Tampered |
1/4 thru 4 | 144 | B78 | C38 |
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ASTM A563 - Grade C3 |
Atmospheric Corrosion Resistant Steel May be Quenched and Tampered |
1/4 thru 4 | 144 | B78 | C38 |
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ASTM A563 - Grade D |
Carbon Steel May be Quenched and Tampered |
1/4 thru 4 | 150 | B84 | C38 |
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ASTM A563 - Grade DH Flexloc Nut |
Carbon Steel Quenched and Tampered |
1/4 thru 4 | 175 | C24 | C38 |
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ASTM A563 - Grade DH3 |
Atmospheric Corrosion Resistant Steel,Quenched and Tampered |
1/4 thru 4 | 175 | C24 | C38 |
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ASTM A194 - Grade 1 |
Carbon Steel |
1/4 thru 4 | 130 | B70 | - |
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ASTM A194 - Grade 2 |
Medium Carbon Steel |
1/4 thru 4 | 150 | 159 | 352 |
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ASTM A194 - Grade 2H Flexloc Nut |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 4 | 175 | C24 | C38 |
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ASTM A194 - Grade 2HM |
Medium Carbon Steel, Quenched and Tempered |
1/4 thru 4 | 150 | 159 | 237 |
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ASTM A194 - Grade 4 |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 4 | 175 | C24 | C38 |
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ASTM A194 - Grade 7 Flexloc Nut |
Medium Carbon Alloy Steel,Quenched and Tempered |
1/4 thru 4 | 175 | C24 | C38 |
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ASTM A194 - Grade 7M |
Medium Carbon Alloy Steel, Quenched and Tempered |
1/4 thru 4 | 150 | 159 | 237 |
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