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Pan head screws JIS B 1111 (A1)
Versatile fasteners with a slightly rounded low-profile top, they have a flat surface under the head to clamp the material surface, on the M3 M4 and M5 a dot in the head denotes the later ISO thread. JIS Head size on pan head is 1mm less than the diameter on ISO screws.
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Pan head screws in the Pre 67 thread pitch
This pitch was a course thread and is classed as a JIS thread, found in M3,(0.6mm) M4, (0.75mm) and M5 (0.90mm) these do not have a dot in the head.
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Pan Head Screws with encapsulated washers JIS B 1188 (T1B)
The washer can be spring, plain or both, this helps with assembly and the washer help to prevent loosening
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Philips cross hex bolt
Usually found with on an upset head bolt with a slight recess in the head and a Phil screwdriver or Hex Spanner to tighten
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Cross/Slot Head JIS B 1119 (2P)
This screw has both Philips (cross) and Slotted (flat) type of head, used usually with electrical items the slot giving better clamping force
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Cheese head screw JIS B 1119
A type of machine screw with a cylindrical head that resembles a wheel of cheese. These screws are frequently used in precision engineering and electrical assemblies due to their high clamping strength and deep drive recesses
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Round-Oval Countersunk JIS B 1111 (T4)
Or raised head Screws are designed to fit a countersunk hole for better clamping force, with a raised decorative head
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Countersunk JIS B 1111 (JA4)
Or flat head Screws are designed to fit a conical countersunk hole for better clamping force, flush fitting head
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JIS Hex Bolts
Hex bolt head sizes A/F (Across Flats) classes as JIS or ISO
M3 5.5mm (ISO)
M4 7mm (ISO)
M5 8mm (ISO)
M6 10mm (ISO)
M8 12mm (JIS) 13mm (ISO) 14mm (JIS)
M10 14mm (JIS) 15mm (ISO) 17mm (ISO)
M12 17mm (JIS) 19mm (ISO)
M14 17mm (JIS) 19mm (ISO)
M16 22mm (JIS) 24mm (ISO)
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Unmarked Hex Bolt JIS B 1180
The lot of JIS hex bolts used on motorcycles have no mark on the top of the head,
Any mark is usually the grade of steel, 4, 6, 7, 8, 9, 10, 11
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Mark 7 Hex Bolt JIS B 1180
These bolts have a 7 in the head, this is the classed as an 8.8 Grade of steel.
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Upset Hex Bolt Mark 4 JIS B 1180
These bolts have a slight recess in the head, and may come with a number to denote the grade of steel, in this case with a 4, meaning an 4.8 grade of steel.
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Upset Hex Bolt Mark 7 JIS B 1180
These bolts have a slight recess in the head, and may come with a number to denote the grade of steel, in this case with a 7, meaning an 8.8 grade of steel.
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Flanged Upset Hex Bolt Mark 7 JIS B 1189
These bolts have a slight recess in the head with a flange, the flange is to help spread the load and eliminates the use of a washer, they may come with a number to denote the grade of steel, in this case a 7, meaning an 8.8 grade of steel.
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Hexagon socket head cap screw JIS B 1176
Commonly known as Allen head screws, are fasteners featuring a cylindrical head with an internal hexagonal recess, designed to be tightened with an Allen wrench or hex key
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Self Tapping Screw JIS B 1122
Specialized fasteners designed to create their own mating threads as they are driven into materials like metal, plastic, or wood
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Spring washers, or split/lock washers JIS B 1251
Are specialized, non-flat fasteners designed to provide axial load and create friction, preventing nut or bolt loosening due to vibration. They act as a spring, absorbing shock, and are commonly used in machinery, automotive
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Plain or Flat washers JIS B 1256
Thin, flat, annular rings used with nuts and bolts to distribute fastener load, protect surfaces from damage, and prevent loosening available in many different sized
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Type 1 JIS B 1181
Also known as and engineers nut, Chamfered on one side, flat on the other. flat side engages with the surface of the item being clamped.
Standard height =0.8 times the thread diameter
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Type 2 JIS B 1181
Also know as a full nut, Chamfered on both sides, no preference to fitment
Standard height =0.8 times the thread diameter
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Type 3 JIS B 1181
Also know as a thin nut or jam nut, Chamfered on both sides, no preference to fitment, used for low-profile applications.
Height =0.5 times the thread diameter
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Plain Flanged Nut
Hexagonal nut with a wide, integrated circular base that acts as a built-in washer to distribute clamping pressure over a larger surface area, plain flange nuts have a smooth underside, making them ideal for applications where you want to avoid scratching or marring the surface of the material being fastened
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Flange Metal Locking Nut
Hexagonal nut with a wide, integrated circular base that acts as a built-in washer these lock nuts have a stamped metal insert to create constant friction against the bolt. Because they are entirely metal, they are ideal for high-temperature environments
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Toothed Flanged Nut
These feature angled teeth on the underside of the flange that dig into the mating surface. They are "free-spinning" during installation but provide high resistance to loosening once tightened. They should not be used with separate washers or on surfaces where scratching is a concern
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Dome Nut Low Top
Low-top dome nuts, also known as Cap or Acorn nuts, these are designed for applications with limited vertical clearance or where a more subtle aesthetic is desired
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Flanged Dome Cap or Acorn Nut
A flanged acorn nut is a fastener that combines a protective domed cap with an integrated wide base, or flange, which acts as a built-in washer to distribute load and protect the mounting surface. These nuts are primarily used for decorative finishes
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Long Cap Nut
Commonly known as high crown acorn nut, a specialised fastener featuring an extended dome that completely encloses the end of a threaded bolt. Unlike standard cap nuts, these provide a deeper internal thread depth to accommodate longer or slightly protruding studs while offering a clean, finished appearance and protecting the threads from environment
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Long Dome Nut with Flange
A long dome nut with a flange, also known as a deep dome flange nut or extended flanged acorn nut, is a fastener that combines a protective cap with a wide integrated washer base. These are typically used in automotive and industrial applications where protecting protruding threads from corrosion is essential
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Full Lock Nut all Metal
Nut with built in locking strips to deform and grip the tread, ideal where temperature would melt the nylon in nyloc nuts
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Half Lock Nut all Metal
Nut with built in locking strips to deform and grip the tread, ideal where temperature would melt the nylon in nyloc nuts, only half the thickness of the full nut, for use where access is limited
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Full Lock Nut Spring
Nut with built in spring washer, eliminates the use of extra parts to safe time in assembly
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Dome Low Top Lock Nut
Dome nut with a metal locking mechanism to help prevent loosening from vibration with a cap over one end of the nut to help protect the tread
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