Steel Connection Plates: P20 / P23 / P24 Gusset Plate Specifications

Steel connection plates (gusset plates) are the bolted joints that hold trusses, beams and columns together. Below are three PL5-thickness plates from an actual fabrication drawing, including dimensions, hole layout, quantity and calculated weight.

 

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Specifications

Plate	Qty	Section	Size  (mm)	Holes	Unit Wt  (kg)	Total Wt 总(kg)
P20	140	PL5×467	593 × 467	9×Φ12	10.87	1,521.7
P24	600	PL5×220	1,096 × 220	8×Φ12	9.47	5,680.4
P23	20	PL5×550	650 × 550	9×Φ12	14.04	280.7
Total	760 pcs	—	—	—	—	~7,483 kg (7.5 t)

All plates are 5 mm thick, with 12 mm diameter bolt holes.

 

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P20 — Square Gusset Plate P20 

· Size: 593 × 467 × 5 mm

· Hole pattern: 9 holes in 3 rows × 3 columns, edge distance 66 mm (side) / 34 mm (end)

· Application: truss chord-to-web connection, mid-span node

P24 — Long Splice Plate P24 

· Size: 1,096 × 220 × 5 mm (both ends chamfered)

· Hole pattern: 8 holes at 200 mm spacing (4×2), edge distance 148 mm

· Application: chord splicing, beam flange joint, purlin connection

P23 — Large Gusset Plate P23 

· Size: 650 × 550 × 5 mm

· Hole pattern: 9 holes in 3 rows × 3 columns, edge distance 108/82 mm

· Application: eave node, support bearing connection, multi-member joint

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Typical Applications

1. Steel truss fabrication — connect chord members to web diagonals at every node; 9-hole pattern fits circular tube intersections.

2. Beam-to-column bolted joints — P24 long splice plate joins beam flanges in prefabricated steel frames.

3. Roof purlin & girt fixing — 5 mm thickness is sufficient for secondary member (C/Z purlin) connections.

4. Temporary works & bracing — bolted plates allow demountable connections for scaffolding, shoring and temporary steel structures.

5. Retrofit & expansion projects — bolted (rather than welded) plates reduce site work and fit existing structure upgrades.

 

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Design Notes

· Thickness 5 mm suits light-to-medium loads; for heavy crane or seismic zones, use 8–12 mm plates.

· Hole diameter Φ12 matches M12 bolts; standard edge distance ≥ 1.5×hole diameter per code.

· All plates are laser or plasma cut from hot-rolled steel sheet (Q235B / Q355B).