Hot Galvanized Short Shank Line Post Studs for Composite Insulator

Hot-dip galvanized short shank studs

for mounting compatible composite line

post insulators to steel crossarms,

brackets and mounting plates.

Category: Power Fittings

Email: info@kangnaigu.net

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Product Details

1Product AttributesInsulator mounting bolt assembly

Product Name	Post Insulator Stud Bolt Kit (Insulator Mounting Bolt Set)
Standard	DL/T 284-2021 (Hot-dip galvanized bolts & nuts for transmission towers and power fittings); equivalent to ISO 898-1, ASTM A193
Property Class	4.8 / 5.6 / 6.8 / 8.8 (commonly 4.8, 6.8, 8.8)
Material	Carbon Steel Q235 / 35# / 45#; high-strength option: 40Cr, 35CrMo alloy steel
Structure	Double-ended stud (threaded both ends, plain shank in middle) for multi-position adjustment
Surface Finish	Hot-Dip Galvanized (HDG), average coating thickness ≥ 50μm (local ≥ 45μm); Dacromet / Geomet / epoxy coating on request
Thread Tolerance	6g / 6H; nuts are over-tapped to fit the hot-dip zinc layer
Size Range	M12, M16, M20, M24, M27, M30, M36 (custom M10–M64 on request)
Length Range	50 – 500 mm, customized per drawing
Applied Voltage	10kV – 1000kV transmission and substation projects
Working Temperature	-50℃ to +300℃; suitable for altitude ≤ 4500m, humidity ≤ 98%

2Kit Components (per bolt)Anti-loosening assembly

1 × Insulator Stud Bolt	DL/T 284, hot-dip galvanized, double-ended thread
1 × Hex Nut	DL/T 284 power HDG nut, over-tapped for zinc layer
1 × Flat Washer	GB/T 97 / ISO 7094, hot-dip galvanized
2 × Spring Lock Washers	GB/T 93, hot-dip galvanized, double-spring anti-loosening
1 × External-Tooth Lock Washer	DIN 6797, hot-dip galvanized, serrated anti-loosening

3Mechanical PropertiesPer ISO 898-1

Tensile Strength (Nominal)	400 MPa (4.8) / 800 MPa (8.8)
Tensile Strength (Minimum)	420 MPa (4.8) / 800 MPa (8.8)
Yield Strength (Minimum)	340 MPa (4.8) / 640 MPa (8.8)
Proof Stress	310 MPa (4.8) / 640 MPa (8.8)
Hardness	130–220 HV (4.8) / 250–320 HV ≈ HRC 28–32 (8.8)
Elongation	≥ 14% (4.8) / ≥ 12% (8.8)

4Surface Finish & Corrosion Protection

Hot-Dip Galvanized (HDG)	Standard finish for outdoor power fittings; coating ≥ 50μm, salt spray > 1000h no red rust
Dacromet / Geomet	High corrosion & heat resistance, no hydrogen embrittlement; suitable for coastal and industrial areas
Epoxy Coating	Optional; voltage resistance ≥ 15kV; for special insulation requirements
Factory Inspection	Torque test, magnetic particle inspection, salt spray test; 100% traceable
Quality System	ISO 9001; CE / IEC 61284 available on request

5Dimension Table – DL/T 284mm, reference values

Values are reference per DL/T 284-2021; actual dimensions may vary by manufacturer and batch.

Thread Size	Pitch (mm)	Across Flats s (mm)	Across Corners e min (mm)	Head Height k (mm)	Thread b (Single Nut, min)
M12	1.75	18	19.85	7.5	30
M16	2.00	24	26.17	10.0	38
M20	2.50	30	32.95	12.5	46
M22	2.50	34	37.29	14.0	48
M24	3.00	36	39.55	15.0	54
M27	3.00	41	45.20	17.0	60
M30	3.50	46	50.85	18.7	66
M36	4.00	55	60.79	22.5	78

6Applications & Packaging

Applications	Post insulator fixing in substations, busbar fittings, tower cross-arms, railway catenary, telecom towers, solar / wind power, street lighting and overhead line hardware
Packaging	Each bolt set individually packed in small polybag; then cartons + plywood pallets; customized neutral / brand packing available
Documents	PI, CI, Packing List, Material Certificate, Galvanizing Test Report, Certificate of Origin (FORM E / RCEP / CO) available on request
Payment Terms	30% T/T in advance, 70% T/T before shipment (or as negotiated)
Lead Time	5–10 days for stock; 15–30 days for customized HDG production
Origin	Yongnian, Handan, Hebei, China – Fastener & Power Hardware Base

7Available Types

DL/T 284 Stud BoltPost Insulator Bolt KitHDG Hex NutSpring Washer ×2External-Tooth Lock Washer4.8 Grade6.8 Grade8.8 GradeDacromet OptionCoastal / Outdoor Use