Holo-Krome® Fasteners

FULLER is a master distributor of HOLO-KROME® fasteners

Holo-Krome B7 Heavy Hex Cap Screws

B7 Heavy Hex Cap Screws

  • ASTM A193 Grade B7
  • Minimum tensile strength 125,000 PSI
  • Wider head than that of a standard hex bolt
  • 4140 Alloy Steel
  • Rockwell Hardness (HRC) 28-34
  • Greater bearing surface; distributes clamping load over greater area
  • Available from 1/2" to 1" in diameter
  • RoHS & DFARS Compliant / 100% USA Melt
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Traceability.
Each fastener has its own quality control number tracing it all the way back to the steel mill.

The highest torque/clamping force available in the entire industry.

Roll threading, not thread cutting, for stronger, more precise radiused root and run-out threads for increased fatigue life.

The most complete line of fasteners in the business in both inch and metric sizes.

ISO 9001:2008
DFARS Compliant
QSLM Class 2 Approved
ROHS Compliant

Holo-Krome Grade 9 Hex Cap Screws

Grade 9 Hex Cap Screws

  • 180,000psi tensile (similar to ASTM A574)
  • 1000-hour EcoGuard™ Coating
  • Consistent Torque-Tension Relationship
  • No risk of hydrogen embrittlement
  • 1-to-1 replacement for current offering with improved corrosion resistance performance
  • DFARS Compliant / 100% USA Melt
  • RoHS, ELV and REACH Compliant
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Holo-Krome 12 Point Flange Screws

12 Point Flange Screws

  • Manufactured and certified to ASTM A574
  • 100% Made in the USA Holo-Krome Quality
  • Alloy Steel
  • Equivalent strength to Socket Head Cap Screw
  • 170,000 - 180,000 PSI Tensile
  • DFARS Compliant / 100% USA Melt
  • RoHS Compliant
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Holo-Krome Socket Head Cap Screw

Socket Head Cap Screws: Black Oxide Finish, Alloy Steel

  • Thermo-Forging®: Preserves the metal fibers – continuous and uncut. The result is a stronger screw with 15-20% increased resistance to fatigue failure.
  • Dimensional Control: Critical areas such as under head bearing surface and radius, run-out thread section and thread profile are designed carefully.
  • Precision Threads: Present methods ensure smooth, burnished threads unsurpassed for uniformity and accuracy.

Alloy Steel Black Oxide → M2 - M36 / #0 - 1-1/4"
Alloy Steel Zinc Plating → #4 - #10
Stainless Steel → M3 - M6 / #2 - 1-1/4"

View full METRIC rangepdf (529kb)      View full INCH rangepdf (529kb)

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Holo-Krome Button Head Socket Cap Screws

Button Head Socket Cap Screws: Black Oxide Finish, Alloy Steel

  • Forged sockets usable to full depth
  • Smooth, low contour forged head for clean assembly of thin sections
  • Unified standard threads are Class 3A UNRC and UNRF with Holo-Krome controlled radius roots and radius run-out

Alloy Steel Black Oxide → M3 - M12 / #6 - 5/8"

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Holo-Krome Flat Head Socket Cap Screw

Flat Head Socket Cap Screws: Metric, Alloy Steel

  • Non-Slip Driving: With the close-fitting, internally engaging hex key, power is transmitted for extra firm setups without loss through side play, reaming or slipping. Costly slips of the driving tool are avoided, along with possible damage both to the work and the screw.
  • Accurately Formed Heads: Screws have the standard 82 degree angle under the head. Sockets are accurately centered in the screw head and are formed with clean edges without burrs. No ragged chips are in the socket bottom to prevent the full leverage of the hex key from being used.
  • Class 3 Fit Threads: The smooth, burnished threads are unsurpassed for accurancy and uniformity. Close frictional contact between screw threads and threads of tapped hole is of paramount importance. The harder the screw is turned down with the sure-gripping key, the greater becomes the friction which is holding power.
  • No Burred Slots: Hex-socket Flat Head Cap Screws are ideal for countersinking with complete closed head contact all around. No slivered or damaged slots caused by driving tool skids. An even surface is always assured.

Alloy Steel Black Oxide → M3 - M16 / #4 - 3/4"

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Holo-Krome Low Head Socket Cap Screw

Low Head Socket Cap Screws: Metric, Alloy Steel

  • Unified standard threads are Class 3A UNRC and UNRF
  • Closely controlled fillet between head and body for maximum fatigue strength

Alloy Steel Black Oxide → M4 - M16 / #8 - 1/2"

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Holo-Krome Socket Set Screws

Socket Set Screws: Alloy Steel, Plain Finish

  • Sealing Advantage: Holo-Krome set screws are perfectly adapted for use in gauges where tamper-proof settings are necessary. By setting screws flush with or below the surface, wax can be melted into the depression and socket ruling out any chance of unauthorized changes being made.
  • Ideal for Fine Adjustments: Because of the close, snug engagement between key and socket, screws can be set up or adjusted without risk of the key slipping. Properly seated, the key cannot ride out of the socket. Fine, delicate adjustments are readily made: with Holo-Krome it is easy to “feel” the amount of tightening pressure being applied.

Black Oxide → #4 - 1"
Plain Finish → #6 - 3/8"

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Holo-Krome Socket Shoulder Bolts

Socket Shoulder Bolts: Alloy Steel

  • “Tru-Ground” Surfaces: Holo-Krome “Tru-Ground” process produces smooth, highly polished head and shoulder surfaces with unequalled concentricity between head and body. The precision made possible by this process permits holding diameter tolerances to closer limits. Heads are made to a height admitting die clearance even in cramped designs. “Tru-Ground” surfaces impose maximum resistance through fiction.
  • Made of Heat-Treated Alloy Steel: Use of alloy steel heat-treated to exactly uniform hardness, gives these screws the correct balance of strength and toughness. Accurate sockets and precision Class 3 fit threads add up to holding power to withstand punishing shocks and stresses.

Alloy Steel Plain Finish → M6 - M16 / #1/4 - 3/4"

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Holo-Krome Dowel Pins

Dowel Pins: Black Luster Finish, Pull, Alloy Steel

Dowel pins are designed to achieve maximum holding power in assemblies where parts must be accurately positioned and held in absolute relations to one another. They serve definite and important functions in holding parts in alignment by absorbing side pressures and lateral thrusts, at the same time facilitating quick disassembly re-assembly in their exact relationship.

Pull Dowel → M3 - M20 / 1/4 - 1"
Standard → 1/8" - 1"
Oversized → 1/8" - 1/2"

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View full pull dowel rangepdf (529kb)

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Holo-Krome Socket Jam Screws

Socket Jam Screws

Hex socket jam screws are useful for locking set screws, springs, and flow controls into tapped holes. The controlled socket dimensions give good “wrenchability” for use time after time. The precision 3A threads help in providing a vibration resistant joint. The tenacious black finish gives a quality appearance and protection. The full length hex socket permits access from either end or visual inspection of the locked part.

Alloy Steel Plain Finish → #4 - 1"

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Holo-Krome Socket Pressure Plugs

Socket Pressure Plugs: Brass, 7/8" Taper Flush Type PTF

  • Precision-forged deep sockets with smooth, flat walls and controlled corner radius to ensure even distribution of driving torque.
  • Threads are precision rolled to provide smooth fully formed tapered threads for a high pressure seal. Rolled threads improve the sealing action by eliminating spiral machining marks.
  • Controlled structural grain flow and greater wall thickness provide superior bursting resistance.

Brass, 7/8” Taper Flush Type PTF → 1/16" - 3/4"
Alloy Steel, 7/8” Taper Flush Type PTF → 1/16" - 3/4"
Alloy Steel, 3/4” Taper Dryseal NPTF → 3/4" - 1/1/4"

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Holo-Krome Socket Pressure Plugs

Allenut

  • High quality, multi-purpose, internally-threaded fasteners afford compact holding power
  • 12 pt (double hex) socket has 12 drawing points for easier hex key engagement
  • Knurled surface allows finger “spinning” to point where wrenching force is required
  • Allenuts serve as ready tapped holes, or to replace stripped or worn threads
  • Allenuts may offer designers significant savings in space weight and materials

Alloy Steel → #4 - 1"
Stainless Steel → #4 - 3/8"

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Assortments

  • Inch

Holo-Krome Part# 56880 - 705 Pc. SAE Set Screw and Hex Key Assortment
Holo-Krome Part# 56884 - 145 Pc. SAE Set Screw and Hex Key Assortment
Holo-Krome Part# 56410 - 170 Pc. SAE Cap Screw Set
Holo-Krome Part# 56420 - 300 Pc. SAE Button Head Cap Screw Set
Holo-Krome Part# 56430 - 300 Pc. SAE Flat Head Cap Screw Set
Holo-Krome Part# 56886 - 336 Pc. SAE Set Screw and Hex Key Assortment
Holo-Krome Part# 56438 - 300 Pc. SAE Holo-Knurl® Point Screw Set

View inch assortment contentspdf (529kb)

  • Metric

Holo-Krome Part# 76582 - 274 Pc. Metric Cap Screw and Hex Key Assortment

View metric assortment contentspdf (529kb)

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Custom Designed Fastener Solutions

Custom Designed Fastener Solutions

HOLO-KROME also manufactures semi-standards, special fasteners and cold-headed parts.

They can shape various types of material - aluminum and brasses, austenitic and martensitic stainless , 4000 series alloy steels, all the way through H-11 and other tool steels - into difficult dimensions while retaining the metallurgically important property of grain flow.

Contact us with your "tough-to-manufacture" part problems.

 
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Holo-Krome catalogue, technical resources and data sheets.
Holo-Krome Technical Manualpdf (817kb)