T-39 Guardrail

The T-39™ Guardrail is a strong post Thrie-beam system tested to NCHRP Report 350 Test Level 4. In the 39” guardrail system height, the Thrie-beam attaches directly to Steel Yielding Line Posts (SYLP™) and does not use offset blocks.

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  • Strong posts with weakening holes at the ground line.
  • Does not use offset blocks which helps reduce site grading.
  • Countersunk-head bolts and Post Flange Protectors.
  • Mid-span splices between adjacent posts.
  • Single-Face or Double-Face (median) application.


  • Standard Thrie-beam Guardrail
  • Steel Yielding Line Posts (SYLP™): W6 x 8.5 x 6’ 0″ (W150 x 13.0 x 1.83 m)
  • Thrie-beam Guardrail Height: 39″ (991 mm)
  • Post spacing: 6’ 3″ (1.9 m)
  • Countersunk Head Bolts: 5/8″ x 1¾″ (16 mm x 45 mm)
  • W-beam Post Flange Protector at Each Post

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Product Images

Product Documents

PI Sheet

T-39 Guardrail


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