#120 (1-1/2") Pitch Sprockets

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#120 (1-1/2") Pitch Sprockets

ANSI #120 sprockets are sized for 1-1/2 inch (38.1 mm) pitch roller chain: the industry-standard size for continuous high-load operation, shock-resistant applications. Our BlackStar #120 sprockets are precision-cut from medium carbon steel with a hardened tooth profile, available in tooth counts from 9 to 95 and three hub configurations (A-plate, B-hub, C-hub) for direct shaft mounting or bushing installation.

When To Use #120 Sprockets

#120 chain has a 1-1/2" pitch with 7/8" roller diameter. Working load capacity is approximately 7,500 lbs per strand, with average ultimate tensile strength of 34,000 lbs. This combination makes #120 ideal for:

Industries: mining equipment, large industrial conveyors, heavy machinery, pump drives, food processing
Common applications: underground mining, large palletizers, sugar mills, heavy lumber processing, oil field equipment
Replacement of existing #120 sprockets without changing chain specification
New designs where engineering analysis specifies this ANSI size

#120 Pitch Specifications

ANSI Designation	#120
Pitch (P)	1-1/2" (38.1 mm)
Roller Diameter	7/8"
Pin Diameter	0.437"
Average Tensile Strength	34,000 lbs
Working Load (Single Strand)	7,500 lbs
ANSI Standard	B29.1 (Inch Series Precision Roller Chain)

How To Select The Right Sprocket

Three specifications drive sprocket selection for any chain drive:

1. Tooth Count

More teeth means smoother chain engagement and reduced wear per tooth, but increases overall diameter. As a rule of thumb: drive sprockets should have at least 17 teeth for high-speed applications, and at least 19 teeth for shock-loaded systems. Driven sprockets can go larger for speed reduction. We stock 9-95 tooth options for most pitches.

2. Hub Style

Three hub styles match different mounting needs:

A-Plate: Flat sprocket, no integral hub, use with a bushing (QD or Taper-Lock) for tool-free shaft removal.
B-Hub: Hub on one side of the sprocket, direct shaft mounting with set screws or keyway.
C-Hub: Hubs on both sides, for higher torque transmission and longer engagement.

3. Bore Type

Plain stock bore lets you machine to a custom shaft size. Finished bore with keyway and set screws mounts directly. QD or Taper-Lock requires a matching bushing but allows fast field removal.

Chain & Component Compatibility

#120 sprockets pair with #120 ANSI standard roller chain. For multi-strand applications, you need a matching multi-strand sprocket: a #120-2 (double-strand) sprocket for #120-2 chain. Our Lynx chain line offers cottered and riveted variants in single, double, and triple strand configurations.

🔗 Shop Compatible Products

Find the matching chain, connecting links, and offset links for your #120 sprocket drive:

→ #120 Pitch Chain → All Lynx Chain → Bushings

Frequently Asked Questions

How do I confirm my chain is #120 pitch?

Measure the distance from pin center to adjacent pin center along the chain, for #120, that distance is exactly 1-1/2" (38.1 mm). Roller diameter is 7/8". Most ANSI standard chain has the size number stamped on the outer link plates (120 or 120H for the heavy series).

Can I use #120H chain on #120 sprockets?

Yes, #120H (Heavy series) chain has identical pitch and pin geometry to standard #120 chain, but uses thicker side plates for higher tensile strength. It mates with standard #120 sprockets with no modifications required.

What's the difference between #120 and #120-2 sprockets?

#120-2 is the double-strand version: two parallel rows of teeth on a wider hub, designed to mate with #120-2 (double-strand) chain. Same pitch and tooth profile, but with double the load capacity. A single-strand #120 sprocket cannot drive double-strand chain: the strands need separate tooth rows.

How does sprocket wear affect chain life?

Worn sprockets accelerate chain wear by causing uneven load distribution across pins. If teeth show pointed, hooked, or asymmetric profiles, replace the sprocket, installing new chain on worn sprockets typically reduces chain life by 50% or more. A simple visual check: compare unloaded teeth against loaded teeth; significant asymmetry indicates time for replacement.

Do I need a bushing for a finished-bore sprocket?

No. Finished-bore sprockets have the bore machined to a specific shaft size with keyway and set screws, they mount directly to a matching shaft. Bushings (QD or Taper-Lock) are only needed with A-plate sprockets, which have a plain bore designed to fit a removable bushing for tool-free shaft removal.

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