12 Point Nut

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12 Point Nuts, also known as Double Hex Nuts, are high-performance fasteners engineered for applications requiring extreme tensile strength and reduced wrenching clearance. Their unique 12-point drive design allows for higher torque application compared to standard hex nuts, while the reduced head diameter permits tighter spacing in engine manifolds and aerospace assemblies. Manufactured to aerospace standards like AMS, MS21042, and IFI 115, these nuts are a staple in the aviation and racing industries. At Inconel Fasteners, we precision-manufacture these from superalloys like Inconel 718, Inconel 625, and A286, ensuring they withstand the immense heat and vibration of turbine engines without seizing or shearing.

Detailed Specifications

Size Range
M5 to M56 Metric 1/4” to 2-1/2″ Imperial
Nut Configuration
12 Point Flange Nut Double Hex Nut (No Flange) Self-Locking (Elliptical)
Type of Threads
UNJF (Aerospace Fine) UNF (Fine) UNC (Coarse) Metric Fine (For Engines) Metric Coarse
Dimensional Standards
IFI 115 (Flange 12 Pt) MS 21042 (Reduced Hex) AS 14227 NAS 1805
Type of Manufacturing
Hot Forging (Precision) CNC Machined from Bar Cold Heading (Small Sizes)
Raw Material Origin
Indian Origin European Origin Japanese Origin US Origin Korean Origin
Finish Part Origin
Made in India Custom Origin per Request
Surface Coating (High Temp)
Silver Plating (AMS 2410) Molybdenum Disulfide (MoS2) Cadmium Plating Passivated Dry Film Lubricant
Marking
Manufacturer Logo Grade ID (e.g., 718) Heat Trace Code
Heat Treatment Details
Solution Annealing Age Hardening (Precipitation) Stress Relieving
Delivery Terms
Ex-Works (EXW) FOB CIF CFR DDP
Packing Type
Small Carton Boxes Wooden Pallets VCI (Rust Preventative)
Payment Methods
L/C (Letter of Credit) T/T (Wire Transfer) Western Union
Certifications
ISO 9001:2015 AS9100D (Aerospace) MTC EN 10204 3.1
Additional Certifications
NABL Approved Lab Reports Tensile Test Report Microstructure Analysis
Mandatory & Additional Requirements
Positive Material Identification (PMI) Proof Load Test Thread Inspection (System 22)

Available Inconel Grades & Standards

Dimensions Chart (12 Point Flange Nut)

Nominal Size
(Dia)		 Threads Per Inch
(UNF / UNC)		 Width Across Flats (s)
(Wrench Size)		 Flange Diameter (b)
(Max)		 Total Height (h)
(Max)
1/4" 28 / 20 1/4" 0.422" 0.260"
5/16" 24 / 18 5/16" 0.531" 0.323"
3/8" 24 / 16 3/8" 0.641" 0.390"
7/16" 20 / 14 7/16" 0.750" 0.455"
1/2" 20 / 13 1/2" 0.859" 0.520"
9/16" 18 / 12 9/16" 0.969" 0.585"
5/8" 18 / 11 5/8" 1.078" 0.650"
3/4" 16 / 10 3/4" 1.297" 0.780"
7/8" 14 / 9 7/8" 1.516" 0.910"
1" 12 / 8 1" 1.734" 1.040"

Chemical Composition (Inconel 12-Point Grades)

Grade Ni (Nickel) Cr (Chromium) Fe (Iron) Mo (Molybdenum) Nb (Niobium) Ti (Titanium) Other Elements
Inconel 718 50.0 - 55.0% 17.0 - 21.0% Balance 2.8 - 3.3% 4.75 - 5.5% 0.65 - 1.15% Al 0.2 - 0.8%
Inconel A286 (Gr. 660) 24.0 - 27.0% 13.5 - 16.0% Balance 1.0 - 1.5% - 1.9 - 2.35% V 0.1 - 0.5%
Inconel X-750 70.0% Min 14.0 - 17.0% 5.0 - 9.0% - 0.7 - 1.2% 2.25 - 2.75% Al 0.4 - 1.0%
Inconel 625 58.0% Min 20.0 - 23.0% 5.0% Max 8.0 - 10.0% 3.15 - 4.15% 0.4% Max Al 0.4% Max
Inconel 725 55.0 - 59.0% 19.0 - 22.5% Balance 7.0 - 9.5% 2.75 - 4.0% 1.0 - 1.7% Al 0.35%

Mechanical Properties (12 Point Nuts)

Grade Tensile Strength
(MPa / N/mm²) Min		 Yield Strength
(0.2% Offset) Min		 Proof Load
(MPa)		 Hardness
(HRC)
Inconel 718 1275 (185 ksi) 1035 (150 ksi) 1035 MPa 36 - 44 HRC
Inconel A286 (Gr. 660) 900 - 1050 600 - 750 585 MPa 24 - 35 HRC
Inconel X-750 1100 700 700 MPa 30 - 40 HRC
Inconel 725 1137 827 827 MPa 30 - 40 HRC
Inconel 625 827 414 414 MPa 20 - 25 HRC

DIN Standards for Bolts

Comprehensive list of dimensional standards for industrial fasteners.

Series 100 - 900
  • DIN 186
  • DIN 188
  • DIN 261
  • DIN 444
  • DIN 479
  • DIN 580
  • DIN 601
  • DIN 603
  • DIN 604
  • DIN 605
  • DIN 610
  • DIN 787
  • DIN 797
  • DIN 931
  • DIN 933
  • DIN 933 SZ
Nuts & Precision
  • DIN 431
  • DIN 439 A/B
  • DIN 466
  • DIN 467
  • DIN 508
  • DIN 547
  • DIN 548
  • DIN 555
  • DIN 557
  • DIN 562
  • DIN 582
  • DIN 798
  • DIN 917
  • DIN 934
  • DIN 935
  • DIN 936
  • DIN 937
Studs & Washers
  • DIN 525
  • DIN 835
  • DIN 938
  • DIN 939
  • DIN 940
  • DIN 976
  • DIN 125 A/B
  • DIN 126
  • DIN 127 A/B
  • DIN 433
  • DIN 440 R/V
  • DIN 6796
  • DIN 7980
  • DIN 9021
Extended & Heavy Series
DIN 3570
DIN 7968
DIN 7969
DIN 7990
DIN 7992
DIN 70613
DIN 70614
DIN 80705
DIN 6331
DIN 6334
DIN 6915
DIN 6924
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