HELICOID SIZE DESIGNATION

BUTTWELD SIZE DESIGNATION

The letter "H" indicates a screw with helicoid flighting. The figures to the left of the "letter" indicate the nominal outside diameter of the conveyor in inches. The first figure following the letters is twice the diameter of the couplings in inches. The last two figures indicate the nominal thickness of the flighting at the outer edge in 1/64". Thus, screw # 12H408 indicates a 12" diameter "H"elicoid screw for 2" diameter couplings with flighting 8/64", or 1/8" thickness out the outer edge.

The letter "S" indicates a screw with buttweld flighting. The figures to the left of the "letter" indicate the nominal outside diameter of the conveyor in inches. The first figure following the letters is twice the diameter of the couplings in inches. The last two figures indicate the nominal thickness of the flighting at the outer edge in 1/64". Thus, screw # 12S612 indicates a 12" diameter "S"ectional screw for 3" diameter couplings with flighting 12/64", or 3/16" nominal thickness.

COMPARISON TABLES OF HELICOID & SECTIONAL FLIGHT SCREWS

HELICOID FLIGHT							SECTIONAL FLIGHT EQUIVALENT
Screw Dia	Screw Part #	Former Part #	Coupling Dia	Nom. Inside Dia of Pipe	Thickness Flights		Screw Part #	Coupling Dia	Nominal Inside Dia of Pipe	Thickness of Flights - Inches
					Inner Edge	Outer Edge
4"	4H204	4 STD	1"	1-1/4"	1/8"	1/16"	4S207	1"	1-1/4"	12 GA
4"	4H206	4 X	1"	1-1/4"	3/16"	3/32"	4S209	1"	1-1/4"	10 GA
6"	6H304	6 STD	1-1/2"	2"	1/8"	1/16"	6S307	1-1/2"	2"	12 GA
6"	6H308	6 X	1-1/2"	2"	1/4"	1/8"	6S309	1-1/2"	2"	10 GA
6"	6H312	6 XX	1-1/2"	2"	3/8"	3/16"	6S312	1-1/2"	2"	3/16"
9"	9H306	9 STD	1-1/2"	2"	3/16"	3/32"	9S309	1-1/2"	2"	10 GA
9"	9H406	9 SPL	2"	2-1/2"	3/16"	3/32"	9S409	2"	2-1/2"	10 GA
9"	9H312	9 X	1-1/2"	2"	3/8"	3/16"	9S312	1-1/2"	2"	3/16"
9"	9H412	9 XX	2"	2-1/2"	3/8"	3/16"	9S412	2"	2-1/2"	3/16"
9"	9H414	9 XXX	2"	2-1/2"	7/16"	7/32"	9S416	2"	2-1/2"	1/4"
10"	10H306	10 STD	1-1/2"	2"	3/16"	3/32"	10S309	1-1/2"	2"	10 GA
10"	10H412	10 XX	2"	2-1/2"	3/8"	3/16"	10S412	2"	2-1/2"	3/16"
12"	12H408	12 STD	2"	2-1/2"	1/4"	1/8"	12S412	2"	2-1/2"	3/16"
12"	12H508	12 SPL	2-7/16"	3"	1/4"	1/8"	12S512	2-7/16"	3"	3/16"
12"	12H412	12 X	2"	2-1/2"	3/8"	3/16"	12S412	2"	2-1/2"	3/16"
12"	12H512	12 XX	2-7/16"	3"	3/8"	3/16"	12S512	2-7/16"	3"	3/16"
12"	12H614	12 XXX	3"	3-1/2"	7/16"	7/32"	12S616	3"	3-1/2"	1/4"
14"	14H508	14 STD	2-7/16"	3"	1/4"	1/8"	14S512	2-7/16"	3"	3/16"
14"	14H614	14 XX	3"	3-1/2"	7/16"	7/32"	14S616	3"	3-1/2"	1/4"
16"	16H610	16 STD	3"	3-1/2"	5/16"	5/32"	16S612	3"	3-1/2"	3/16"
16"	16H614	16 XX	3"	3-1/2"	7/16"	7/32"	16S616	3"	3-1/2"	1/4"

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