Allen Head Bolts

Custom Bolts Manufacturer


Allen Head Bolts


Heatfastener is a professional Allen Head bolts manufacturer and supplier in China. With ISO9001:2008,iso14001:2004, and especially IAFT16949:2009 certification for the automotive industry. Heatfastener offers fully customized custom bolts and screws according to your needs. We can bring your fastener design to reality, and everything according to your requirements.

  • Selected Raw Materials – 23 years raw material supplier: Heatfastener screw manufacturer is the original material supplier of Yongxing Special Steel for 23 years. Mainly supply 304 stainless steel wire. The wire meets national standards. Material reports are available.
  • Special custom – come to the drawing/sample custom:21 years of screw customization experience, can be customized according to the requirement of the sample or drawing custom M1-M14 specifications of special screws, long screws, shoulder screws, small screws, titanium screws, stainless steel screws, etc.
  •  Strict Testing – customized on-demand, rigorous testing: Have a complete production process. Ensure product dimensional tolerances and appearance.
Allen head bolts

Allen Head Bolts Details

Allen screws or Allen Head bolts also call Socket Head Cap Screws, also known as Allen head bolts are stock items at Lightning Bolt in many materials sizes. These screws come with a hexagonal cross-section socket in the head and require an Allen wrench or hex key to drive them into the material and secure them into a structure.

since 1946. Socket Cap Screws have a cylindrical head. Allen head bolts (hex socket) are the primary drive used and is to be torqued using an Allen wrench, also called a hex key. We provide high-quality Socket Head Cap Screws and Metric Allen Bolts. We can also manufacture these items in special materials and custom made as below listed:


  • Stainless steel – SS302, SS304, SS316, (good tenacity),Stainless steel A2 A4
  • Steel – C45(K1045), C46(K1046),C20
  • Brass – C36000 ( C26800), C37700 ( HPb59), C38500( HPb58),C27200CuZn37), C28000(CuZn40)
  • Bronze–C51000, C52100, C54400, etc
  • Aluminum – Al6061, Al6063 etc
  • Carbon steel – C1006,C1010,C1018,C1022,C1035K,C1045
  • Alloy steel – SCM435,C10B21,C10B339
  • Other material– Titanium, UNS C11000 Copper,silicon


  • Grade: Grade 4.8,Grade 6.8,Grade 8.8,Grade10.9,Grade12.9 etc
  • Standard:GB,DIN,ISO, ANSI/ASTM,BS,BSW,JIS, Metric, Inch
  • Finish:Plain, H.D.G, Black oxide, Chrome, Teflon,dacromet,Anodized,With nylok
  • Certificates: ISO9001:2015, ISO14001:2015,IATF16949, ROHS
  • Custom Made:OEM is available,according to customer requirments

Head type&Drive Type

  • Head Type:Flat, Oval, Binding, Pan, Round, Truss, Button, PF,Cheese,Fillister, Pan Washer, Cylinder,Hexagon, Indented Hexagon,Washer
  • Drive Type:Phillips, Slotted, Phiilips/Slotted, 6 Lobe, Pin 6 Lobe, Pozidrive, Square, Triangle,Y type. Tri-wing, S-type, H type, Hexagon, 5 Point,8 point, Spline, Spanner, Clutch, Hex pn,torx pin
  • Machine Screw, Tapping screws,threading cutting screw,threading forming screw


Allen screw socket head cap or Allen head bolts are commonly used in machine assembly, especially for removable panels and parts, they have a round cap with a hex head and are tightened with a socket wrench drive, choose the right cap head for your specific application, longer caps are easier to see when fastened, while button and flat head caps are less apt to snag clothing or linkages, chrome cap bolt has a great appearance, those with a black oxide or armor coat finish resist corrosion

Also, our custom fastener, bolts, and screws are widely used in the below industries

  • Electronics
  • Petrochemicals
  • Consumer products
  • Transportation
  • Agriculture
  • Heavy machinery
  • Construction
  • Automotive
  • Medical
  • Military
  • Aerospace
  • Oil and gas

Types of Allen Screw and Allen Bolt

Cup Head has a flat, chamfered top surface, a smooth or knurled or straight pattern of cylindrical sides, and a flat bearing surface. Compared with the usual cup head, the small cup head hex head screw with smaller head thickness is mainly used for small height occasions. Socket caps have a small cylindrical head with tall vertical sides. Allen (hex socket) drive is a six-sided recess )Internal Hex Socket) for use with an Allen wrench (hex key). This design is the workhorse of the machine-building industry. 
The most important reasons for the increasing use of socket head cap screws in the industry are safety, reliability, and economy

countersunk head Allen screws have a flat top surface and a conical bearing surface with a countersunk head angle of about 82°/90°/120°. This type of metric Allen head screws can be screwed in completely and will not protrude on the surface of the assembled product, Allen CSK  Flat head screws are used for flush mounting of sections, usually where one part slides over another or one part is mounted on another.  Flathead screws, like button heads and low heads, are limited by configuration in their tensile strength capability.  Because of this, they should not be used in applications requiring full strength, where Socket Head Cap Screws should be used.

The button head Allen screws or pan head hexagon socket screws have a low arc top surface and a large flat bearing surface. The hexagon socket step screw is a screw having a cylindrical step under the head. The ultra-low head metric hex socket screw has a circular arc from the side of the head and can withstand a large force area. The Socket Button Head Screw design is primarily used where a lower profile head is required and for aesthetical reasons. These screws can take a lower tightening torque as compared to the DIN 912 screws

Allen Grub Screw: A set screw is a threaded fastener that normally does not have a head. Unlike most other threaded fasteners it is basically a compression device normally used to generate axial thrust. It is also known as a grub screw. It is used to hold parts like a sleeve, collar, coupling, gear, etc. on a shaft to prevent relative motion.Socket set screws offer three types of holding power: torsional (resistance to rotation); axial (resistance to lateral movement); and vibrational. Size selection is an important factor in holding power. the point selection base on the application set screw has a plain cup, knurled cup,flat, cone, dog

Besides, Torx Socket Head Cap Screw, Low Head Allen Cap Screw, Flange Button Head Allen Screw 

We supply all kinds of custom Allen head bolts and Allen screws.Dimensions Of Metric Socket Head Cap Screws

Allen head bolts sizes
Thread Size(d)M1.6M2M2.5M3M4M5M6M8M10
PThread Pitch0.350.40.450.50.70.811.251.5
sNominal Size1.51.522.534568
Allen head bolts dimensions
Thread Size(d)M12M14M16M20M24M30M36M42M48
PThread Pitch1.75222.533.544.55
sNominal Size101214171922273236
Allen head bolts sizes

Need Custom Bolts for Your Industry?

As a 20-year industry experience manufacturer with a factory equipped with precision machines, we can provide, from consultation to production, a one-stop solution for you.

About Us

Shenzhen Heat Hardware Co., Ltd is a leading custom screw manufacturer in China founded in 2000 years. We are specializing in custom screws, security screws, Sems screws, Chicago Screws, Weld Screws, Long screws, Micro Screws, Thumb Screws, Set Screws, Custom bolts, carriage bolts, nuts, and other custom Fasteners. With more than 20years of industry experience. We have serviced over 20000customers including the aerospace industry, automotive industry, electronics, mechanical and electrical products, robots, the Medical industry, communications industry, Outdoor sports products, smart appliances, etc. we can provide one-stop fastener customized service for you no matter what kind of custom fastener you need.

Frequently Asked Questions

Definition of Allen bolt
hardware. : a bolt with a hexagonal socket in its head that is designed to be used with an Allen wrench The Allen bolt is integral to the crank and remains in it when the crank is removed from the spindle

The primary advantage of Allen bolts over hex bolts is that the tool used to do them up can be smaller than the head itself. So they are perfect for if you have a bolt that’s down inside a narrow opening. You can stick the Allen key down into the hole and do up the bolt.

A hex key, also known as an Allen key or Allen wrench, is a small handheld tool that’s used for driving bolts and screws with a hexagonal socket. They are available in many different sizes, though they all have the same hexagonal-shaped tip.

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