Heavy Duty 27 Tooth Chain Sprocket For ISO 04C Chain, 10mm Bore, 57.5mm Outer Diameter, ANSI 25, C45 Carbon Steel With Black Oxide Finish, High Hardness Teeth, Set Screws, Roller Sprocket For Industrial Machinery

High-strength 27-Tooth ISO 04C Sprocket, 10mm Bore, Single Piece
✔️ 27T, 10 mm bore, 57.5 mm OD, ANSI 25, C45 steel, black oxide

This heavy-duty chain sprocket is built for ISO 04C roller chains and is used in power transmission in industrial machines such as milling machines and drilling rigs. It features a hardened tooth surface and a rust-resistant black oxide finish for tough shop environments.

✅ 27 teeth for ISO 04C roller chain compatibility
✅ Bore size 10 mm (0.3937 in) fits standard shafts
✅ Outer diameter 57.5 mm (2.264 in) with ANSI 25 fit
✅ Teeth hardened via high-temperature quenching for long wear life
✅ Includes set screws to lock onto shaft and prevent slip

Dimension	Metric	Inches
Teeth	27	27
Bore	10 mm	0.3937 in
Outer diameter	57.5 mm	2.264 in
Pitch	6.35 mm	0.25 in
ANSI	25	N/A

💡 What is a handy question to ask when selecting a chain sprocket for ISO 04C chains?

You want to verify that the sprocket matches chain pitch, bore, and teeth count for reliable drive.

- Match pitch 6.35 mm (1/4 in) to ensure smooth meshing - Confirm bore 10 mm (0.3937 in) fits the shaft - Check teeth count 27 for proper speed ratio and load support - Look for hardened steel teeth for wear resistance and long life