Huck Auto-Bulb™

An easy-to-install fastening system for superior blind side strength.

For use in thin materials or delicate composites, Huck Auto-Bulb is the perfect solution. Easy-to-install, it works by clamping the joint with a large diameter head and broad, blind side bulb, which spreads to diffuse the load over larger area, ensuring permanent clamp. Also available in stainless steel for superior corrosion resistance.

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Protruding Head Dimensions

Dia. (No.) Steel
Part #
Stainless
Part #
Grip
Range
Metric
Grip Range
Broch
D Max
3/16 (6) ABP-R6-M2 -- .075 - .110 1.9 - 2.8 .471
Hole Size: .191- .2501 ABP-R6-M3 -- .086 - .150 2.2 - 3.8 .510
A max= 0.190 ABP-R6-M4 -- .126 - .189 3.2 - 4.8 .550
B nom= 0.375 ABP-R6-M5 -- .165 - .228 4.2 - 5.8 .589
C max= 0.101 ABP-R6-M6 -- .208 - .268 5.2 - 6.8 .629

ABP-R6-M7 -- .244 - .307 6.2 - 7.8 .668
  ABP-R6-M8 -- .283 - .347 7.2 - 8.8 .708
  ABP-R6-M9 -- .323 - .386 8.2 - 9.8 .747
  ABP-R6-M10 --  .362 - .425 9.2 - 10.8 .787
  ABP-R6-M11 -- .402 - .465 10.2 - 11.8 .826
  ABP-R6-M12  -- .411 - .502 11.2 - 12.8 .866
  ABP-R6-M13 -- .481 - .544 12.2 - 13.8 .905
  ABP-R6-M14  -- .520 - .583 13.2 - 14.8 .945
  ABP-R6-M15 -- .560 - .623 14.2 - 15.8 .984
  ABP-R6-M16 -- .599  .662 15.2 - 16.8 1.024
  ABP-R6-M17 -- .639 - .702 16.2 - 17.8 1.063
  ABP-R6-M18 -- .678 - .741 17.2 - 18.8 1.103






 1/4 (6)  Steel Stainless Grip Metric Grip D Max
Hole Size: .261 - .272 ABP-R8-M2 ABP-4U8-M2 .060 - .138 1.5 - 3.5 .622
A max: .260 ABP-R8-M3 ABP-4U8-M3 .110 - .189 2.8 - 4.8 .673
B nom: .512 ABP-R8-M4 ABP-4U8-M4 .150 - .229 3.8 - 5.8 .713
C max: .130  ABP-R8-M5 ABP-4U8-M5 .189 - .268 4.8 - 6.8 .752
   ABP-R8-M6 ABP-4U8-M6 .229 - .308 5.8 - 7.8 .792
   ABP-R8-M7 ABP-4U8-M7 .268 - .346 6.8 - 8.8 .831
   ABP-R8-M8 ABP-4U8-M8 .308 - .387 7.8 - 9.8 .871
   ABP-R8-M9 ABP-4U8-M9 .346 - .425 8.8 - 10.8 .910
   ABP-R8-M10 ABP-4U8-M10 .387 - .466 9.8 - 11.8 .950
   ABP-R8-M11 ABP-4U8-M11 .425 - .504 10.8 - 12.8 .988
  -- ABP-4U8-M12 .466 - .545 11.8 - 13.8 1.029
   -- ABP-4U8-M13 .504 - .583 12.8 - 14.8 1.068
   -- ABP-4U8-M16 .622 - .701 15.8 - 17.8 1.186
  ABP-R8-M19 ABP-4U8-M19  .741 - .820 18.8 - 20.8 1.305

Countersunk Oval Head Dimensions

Dia. (No.) Steel
Part #
Stainless
Part #
Grip
Range
Metric
Grip Range
Broch
D Max
3/8 (12) ABV-R12-6 -- .313 - .437 8.0 - 11.1 1.110
Hole Size: .392-.408 ABV-R12-8 -- .438 - .562 11.1 - 14.3 1.235
A max= 0.393 ABV-R12-10 -- .563 - .687 14.3 - 17.4 1.360
B nom= 0.572 ABV-R12-10X -- .530 - .655 13.5 - 16.6 1.350
C max= 0.175 ABV-R12-12 -- .688 - .812 17.5 - 20.6 1.485

ABV-R12-14 -- .813 - .937 20.7 - 23.8 1.610


Installed Values (Minimum)

Shear  Tensile Pin Retention
3/16" Steel 1400 875 150
1/4" Steel 2600 1600 300
3/8" Steel 6000 4000 600
3/16" Stainless 1400 875 150
1/4" Stainless 2600 1600 300