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Know the head. Match the drive.

Eight head families

Hex Socket Cap dimensional drawing

01

Hex Socket Cap

DIN 912ISO 4762

Head diameter (dk)
≈ 1.5 ~ 1.85 × d (decreases as size increases)
Head height (k)
≈ 1.0 × d
Drive
Hex Socket
Characteristics
Withstands extreme high preload; large tool contact surface prevents cam-out
Typical applications
Frame load-bearing bolts, frame joints, clamps
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Flat Countersunk dimensional drawing

02

Flat Countersunk

DIN 7991ISO 10642

Head diameter (dk)
≈ 2.24 × d (theoretical cone-tip diameter)
Head height (k)
Flush with surface
Drive
Hex / Torx (Torx countersunk per ISO 14581/14582)
Characteristics
Sits completely flush with the workpiece, no protrusion, reduces drag and wind resistance
Typical applications
Countersunk brake disc mounts, steering wheel hubs
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Button Head Hex dimensional drawing

03

Button Head Hex

ISO 7380-1

Head diameter (dk)
≈ 1.75 ~ 1.9 × d
Head height (k)
≈ 0.55 × d
Drive
Hex Socket
Characteristics
Smooth rounded profile, attractive finish, no sharp edges; prevents snagging or injury
Typical applications
Fairing trim panels, mudguards, bottle cages
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Flange Torx Bolt dimensional drawing

04

Flange Torx Bolt

Custom Spec

Head diameter (dk)
With integrated flange
Head height (k)
≈ 0.9 ~ 1.0 × d
Drive
Torx Drive (T20~T50)
Characteristics
Torx star engagement applies force vertically, eliminating radial side force and cam-out
Typical applications
Motorcycle engine side covers, master cylinder caps, oil lines
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Drilled Hex Flange dimensional drawing

05

Drilled Hex Flange

Race Spec (based on DIN 6921/ISO 15071)

Head diameter (dk)
Serrated / plain flange; drilled head
Head height (k)
≈ 0.93 ~ 1.0 × d
Drive
Dual Drive (external hex + internal socket)
Characteristics
Six lockwire holes evenly distributed around the head; prevents bolt loss under extreme vibration
Typical applications
Racing brake calipers, wheel hub axle
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Flying Saucer Torx dimensional drawing

06

Flying Saucer Torx

Custom Torx

Head diameter (dk)
Extra-wide disc 2.5~3.0×d
Head height (k)
Ultra-thin 3.5~5.0mm
Drive
Torx Drive (T25/T40/T50)
Characteristics
Large flange bearing area; ultra-thin head clears suspension springs and brakes
Typical applications
Supercar aero kits, wheel center caps
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Bi-Hex 12-Point Flange dimensional drawing

07

Bi-Hex 12-Point Flange

Pro-Bolt Spec

Head diameter (dk)
Bi-hex flanged head
Head height (k)
≈ 1.0 × d
Drive
12-Point Socket
Characteristics
Re-indexes every 30° of wrench rotation; ideal for installation in extremely tight spaces
Typical applications
BBS split wheels, engine cylinder fasteners
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Umbrella Hex Head Bolt dimensional drawing

08

Umbrella Hex Head Bolt

ISO 7380-1

Head diameter (dk)
≈ 1.75d ~ 1.9d
Head height (k)
≈ 0.55d
Drive
Hex Socket
Characteristics
Large curved contact surface, high bearing area, good anti-loosening; low-profile attractive head
Typical applications
Motorcycle fairing panels, automotive interior trim, electronics housings, aesthetic assemblies
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Compare at a glance

Head geometry ratios.

Head style comparison
Head styleStandardHead diameter (dk)Head height (k)Drive
Hex Socket CapDIN 912
ISO 4762		≈ 1.5 ~ 1.85 × d (decreases as size increases)≈ 1.0 × dHex Socket
Flat CountersunkDIN 7991
ISO 10642		≈ 2.24 × d (theoretical cone-tip diameter)Flush with surfaceHex / Torx (Torx countersunk per ISO 14581/14582)
Button Head HexISO 7380-1≈ 1.75 ~ 1.9 × d≈ 0.55 × dHex Socket
Flange Torx BoltCustom SpecWith integrated flange≈ 0.9 ~ 1.0 × dTorx Drive (T20~T50)
Drilled Hex FlangeRace Spec (based on DIN 6921/ISO 15071)Serrated / plain flange; drilled head≈ 0.93 ~ 1.0 × dDual Drive (external hex + internal socket)
Flying Saucer TorxCustom TorxExtra-wide disc 2.5~3.0×dUltra-thin 3.5~5.0mmTorx Drive (T25/T40/T50)
Bi-Hex 12-Point FlangePro-Bolt SpecBi-hex flanged head≈ 1.0 × d12-Point Socket
Umbrella Hex Head BoltISO 7380-1≈ 1.75d ~ 1.9d≈ 0.55dHex Socket

Reading the part drawing

  • d = nominal thread diameter
  • P = thread pitch
  • L = bolt length, measured per head type
  • b = threaded length
  • dk = head diameter
  • k = head height
  • s = wrench width across flats

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