Dale Company
Top U-Bolt Manufacturer Since 1959

Reliability, higher pressures, stresses and speeds in today’s machines and equipment demand stronger, more reliable joints and stronger, more reliable fasteners to hold them together. Unbrako’s™ high quality, high strength socket cap screws offer joint reliability and safety with maximum strength and fatigue resistance ensuring you a superior, safer product that meets your most challenging fastener and joint issues. Download our brochure.

Unbrako™ offers the following socket screw and related products:

unbrako fastener

  • Socket Head Cap Screws
    • Standards — Alloy Steel & Stainless Steel
    • Low Heads
  • Shoulder Screws
  • Flat Head Socket Screws
  • Button Head Socket Screws
  • Socket Set Screws
  • Square Head Set Screws
  • Pressure Plugs
    • Dryseal
    • LEVL-SEAL®
    • PTFE TELFLON® -coated LEVL-SEAL
  • Hex Keys — Short Arm, Long Arm and 6″ Long Arm
  • LOC-WEL® Self-Locking Socket Screws
  • Dowel Pins
  • Metric Socket Screw Products

Unbrako’s™ Engineered Fasteners team can design and manufacture virtually any fastener, in any size or configuration, to solve your toughest fastening problems. Their worldwide production facilities and distribution channels give you the capacity you need to ensure a timely supply for even the highest-volume OEM applications.  Unbrako’s™ Engineered Fasteners have been put to the extreme test in such performance sensitive areas as small engines, braking systems, power generating equipment, heavy manufacturing, and commercial printing equipment. Unbrako’s™ proven engineered fasteners consistently perform where others have failed.

unbrako screws

Unbrako™ offers:

  • Hexagon sockets, TORX® drive configurations, 12-point, hex drives
  • Internal and external threads
  • Full threaded and double-ended studs
  • Alloy steel, stainless steel, carbon steel and exotic alloys
  • Large sizes
  • Lengths up to 144″ (3600mm)
  • Thread rolling capability through 3″ (75mm) diameter
  • Specific thread designs and root radius run-outs
  • Cadmium, zinc, tin, chemical black oxide, phosphate and organic platings (standard, propriety and unique-to-application coatings)
NameDiameterLengthWidth of HookMaterialFinish
tensile psi (room temp.)
107 cycle dynamic fatigue (psi)
operating temperatures (unplated)
Types
Application/Features
Socket Head Cap Screws 1960 Series Alloy Steel
Unbrako Socket Head Cap
dale
Use alloy for maximum tensiles; up to 190,000 psi, highest of any socket cap screw
190,000
20,000
550°F
180,000
Socket Head Cap Screws 1960 Series Stainless Steel Unbrako Socket Head Cap Screws 1960 Series Stainless Steel
Use stainless for corrosive, cryogenic or elevated temperature environments, hygienic cleanliness.
95,000
30,000
800°F
Socket Head Cap Screws Low Head Series Unbrako Socket Head Cap Screws Low Head Series
Use in parts too thin for standard height heads and where clearance is limited
170,000
20,000
550°F
Shoulder Screws
Unbrako Shoulder Screws

Unbrako Shoulder Screws

Tool and dieindustry standards; also replace costly special parts-shafts, pivots, clevis pins, guides, trunnion mountings, linkages, etc.

heat treat level psi
shear strength in psi
550°F
160,000
96,000

Flat Head Socket Screws Alloy/ Stainless

Unbrako Flat Head Socket Screws

dale

Uniform, con-head angle for trolled 82° under maximum flush ness and side wall contact; non-slip hex socket prevents marring of material

160,000
96,000
550°F
800°F
Button Head Cap Screws Alloy/ Stainless
Unbrako Button Head Cap Screws

Unbrako Button HeadCap Screws

Low heads streamline design, use in materials too thin to countersink; also for noncritical loading requiring heat treated screws

160,000
96,000
550°F
800°F
PERFORMANCE (See Note 1)
Types
Applications/Features
Hardness
Operating Temperatures (unplated)
Square Head Set Screws
Unbrako Square Head Set Screw
Half-dog or self-locking cup points only. Use where maximum tightening torques are required
Rc 45 (min.)
450° F
Socket Set Screws Alloy Steel
Unbrako Socket Set Screws Alloy Steel
Fasten collars, sheaves, gears, knobs on shafts. Locate machine parts. Cone, half-dog, flat, oval, cup and self-locking cup points standard
Rc 45-53
450°F
Socket Set Screws Stainless Steel
Unbrako Socket Set Screws Stainless Steel
Use stainless for corrosive, cryogenic or elevated temperatures environments. Plain cup point standard. Other styles on special order
Rb96-Rc33
800°F
Pressure Plugs 3/4″ Taper Dryseal
Unbrako Pressure Plugs 3/4" Taper Dryseal
Features common to 3/4″ and 7/8″ tapers: Dryseal threads for positive seal without sealing compound; controlled chamfer for faster starting
Rc 34-40
550°F
800°F
Rb 82 Typical
400°F Brass
7/8″ Taper LEVL-SEAL® Pressure Plug
Unbrako 7/8" Taper LEVL-SEAL® Pressure Plug
LEVL-SEAL® plug features: controlled 7/8″ tape in 3/4″ taper hole seats plug level, flush with surface within 1/2 pitch. LEVL-SEAL plug is an UNBRAKO original
Rc 35-40
550°F
Rb 82 Typical
400°F Brass
PTFE Coated
Unbrako PTFE Coated
PTFE coated plugs seal at 60% lower seating torques without tape or compound; install faster at lower cost; smaller sizes can be power installed; LEVL-SEAL plug type for 100% flush seating
Rc 35-40
450°F (uncoated)
Hex Keys
Unbrako Hex Key
Tough, ductile, for high torquing; accurate fit in all types socket screws; size marked for quick identity
Rc 47-57
torsional shear in-lb. min. 1.2 to 276.000
Dowel Pins (Standard)
Unbrako Dowel Pins
Formed ends, controlled heat treat; close tolerances; standard for die work; also used as bearings, gages, precision parts, etc.
core: Rc 50-58
calculated shear psi
surface
150,000
8 microinch (max)
Dowel Pins Pull-Out Type
Unbrako Dowel Pins Pull-Out Type
For use in blind holes. Easily removed without special tools. Reusable, Save money. No need for knock-out holes. Same physicals, finish, accuracy and tolerances as standard UNBRAKO dowel pins.
surface: Rc 60 (min.)
150,000
8 microinch (max)

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Specials are made to order with short lead times STOCKED SIZES AVAILABLE

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Specializing in Unbrako Screws, Unbrako Pressure Plugs, Unbrako Dowel Pins, socket head cap screws, socket set screws, flat head socket screws, square head set screws, LOC-WEL (R) Self-Locking Socket Screws, Metric socket screw products.