Name: 50-6 6-strand roller chain
Brand: Tsubaki
SKU: 50-6

Question 1

What is the ANSI / ISO equivalent of Tsubaki 50-6RB?

Accepted Answer

The Tsubaki 50-6RB is 6-strand ANSI 50-6 (equivalent to ISO 10A-6) roller chain. Pitch 0.625" (15.88 mm), roller diameter 0.4", width between inner plates 0.375", pin diameter 0.2". These dimensions are fixed by ANSI B29.1 for all manufacturers — the designation IS the cross-reference key.

Question 2

Can I replace 50-6 with a different brand of chain?

Accepted Answer

Yes. Any ANSI 50 (ISO 10A)-6 chain from any manufacturer (Tsubaki, Renold, Diamond, Senqcia, Donghua, and others) shares identical pitch, roller diameter, width-between-plates, pin diameter, and plate thickness — the ANSI B29.1 standard pins those dimensions to manufacturer-independent values. Brands differ in heat treatment, metallurgy, and brand-rated working load — verify the allowable working load against your application before substitution. This Tsubaki variant carries a maximum allowable working load of 6590 lb.

Question 3

When should I use 50-6 (6-strand) instead of single-strand?

Accepted Answer

Multi-strand ANSI 50 chain runs 6 parallel single-strand runs sharing a single set of pins. It carries roughly 6× the working load of single-strand at the same pitch and outer envelope — useful when a single-strand drive would otherwise need to step up to the next larger pitch. 6-strand allowable working load: 6590 lb (roughly 6× single-strand at the same pitch). Sprocket width must match (multi-strand sprockets carry 6 parallel tooth tracks).

Designation	ANSI 50 / ISO 10A
Series	ANSI B29.1 standard roller chain
Strand count	6 (6-strand)
Pitch	0.625" (15.88 mm)
Roller diameter	0.4"
Width between plates	0.375"
Pin diameter	0.2"
Plate thickness	0.08"
Plate height	0.591"
Avg tensile	42,300 lb
Max allowable load	6,590 lb
Mass	4.14 lb/ft
Pin type	riveted

50-6

Specifications

Get a PDF spec sheet

Equivalents Across Brands

Related Chains

Strand-Count Comparison