Product Summary

Longze Boulons en T robustes (also known as Hammer Head Bolts or T-Slot Fasteners) are specialized mounting hardware manufactured to DIN 975 and compatible industrial standards.

These Longze Boulons en T robustes feature a unique rectangular or "hammer" shaped head designed to be inserted directly into the slot of an aluminum extrusion profile.

Once inserted and rotated $90^\circ$, the head locks securely against the internal ridges of the profile, providing a high-strength threaded stud for mounting brackets, panels, or heavy machinery components.

• ✔ Rear-Loading Efficiency: Can be dropped into the slot at any point along the profile, eliminating the need to slide fasteners in from the ends of the extrusion.

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• ✔ Automatic Self-Alignment: As the nut is tightened, the hammer head automatically rotates into the locking position, ensuring a secure, perpendicular connection every time.

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• ✔ High Clamping Force: The flat, wide surface of the T-head provides a massive contact area, preventing the bolt from pulling out or damaging the aluminum slot under heavy loads.

Product Highlight: Engineered for high-torque applications, Longze T-bolts provide a high-strength, superior alternative to standard sliding nuts in heavy-duty aluminum framing environments.

 

• Hammer Head Geometry – Optimized to fit standard European and American aluminum profiles (20, 30, 40, and 45 series).

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• High-Tensile Steel – Available in Grade 8.8 and 10.9, offering the structural integrity required for industrial CNC frames and heavy automated racking.

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• Precision Threading – Rolled threads ensure smooth nut engagement and resistance to stripping, even after multiple assembly and disassembly cycles.

Technical Standard: Manufactured to strict international tolerances, Longze supports a full range of Metric (M5 - M12) and Imperial (1/4" - 1/2") sizes, ensuring 100% compatibility with global extrusion systems.

 

• Standards: DIN 975 / Custom Industrial Specs

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• Profile Compatibility: 20 / 30 / 40 / 45 / 50 Series Aluminum Extrusions

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• Metric Size Range: M5 to M16

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• Inch Size Range: 1/4" to 1/2"

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• Thread Type: Full Thread (Coarse)

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• Material: Carbon Steel (Grade 8.8, 10.9) / Stainless Steel A2, A4

Material & Mechanical Properties

• Engineering Note: Structural integrity depends on the correct property class. We offer a full material range to meet your specific tensile strength and ductility requirements.

• Matériel	Grade	Tensile Strength	Application
  Acier allié	Grade 8.8	800 MPa	Standard Assembly / Workbenches
  Acier allié	Grade 10.9	1040 MPa	Heavy Machinery / CNC Frames
  Acier inoxydable	A2 (304)	700 MPa	Outdoor Racks / Cleanrooms
  Acier inoxydable	A4 (316)	800 MPa	Marine / Chemical Environments

Dimensions & Profile Comparison

• Longze provides precision-engineered fasteners supporting both Metric (ST/M) and Imperial (# Gauge/Inch) standards. Use this integrated conversion table to identify the exact specifications required for your international project.

• American Size (# Gauge/Inch)	Nearest Metric Size (ST/M)	Decimal Diameter (mm)	Decimal Diameter (inch)	Threads Per Inch (TPI/Pitch)	Head Diameter (dk)
  #2 - 56	ST 2.2	2.18 mm	0.086"	0.8 mm / 56 TPI	4.3 mm
  #4 - 40	ST 2.9	2.84 mm	0.112"	1.1 mm / 40 TPI	5.5 mm
  #6 - 32	ST 3.5	3.51 mm	0.138"	1.3 mm / 32 TPI	6.8 mm
  #8 - 32	ST 4.2	4.17 mm	0.164"	1.4 mm / 32 TPI	8.1 mm
  #10 - 24	ST 4.8	4.83 mm	0.190"	1.6 mm / 24 TPI	9.5 mm
  #12 - 24	ST 5.5	5.49 mm	0.216"	1.8 mm / 24 TPI	10.8 mm
  1/4" - 20	ST 6.3	6.35 mm	0.250"	1.8 mm / 20 TPI	12.4 mm
  5/16" - 18	ST 8.0	7.94 mm	0.312"	2.1 mm / 18 TPI	15.8 mm

Surface Treatment

• Procurement Guide: Surface finish determines service life. Longze provides specialized coatings to ensure maximum corrosion resistance and aesthetic consistency for any environment.

• Coating	Salt Spray	Appearance	Environnement
  Zinc Plated	72 - 144h	Silver / Blue	Indoor / General Assembly
  Nickel Plated	48 - 96h	Bright Silver	Decorative / Cleanroom
  Black Oxide	24 - 48h	Matte Black	Stealth Frames / Electronics
  Passivated	1000h+	Natural SS	Marine / High Humidity