Standard RC Servo, Hitec HS-311

40 mm by 20 mm by 36.5 mm over the case, ears spanning 52.8 mm: the Hitec HS-311 standard servo, mounted by 4.5 mm mounting holes 47.8 mm apart. Download it as simplified STEP files.

How these parts are made, and what the levels mean: read the method

• Also searched as: Hitec HS-311 servo
• Model id: rc-servos-hitec-hs311
• Standard: RC servo · size Hitec HS-311

Files

Part key	Simplified
rc-servos-hitec-hs311	STEP

Dimensions

Symbol	Name	min	nom	max	Modeled	Rule	Level
L	Case length		40		40	nominal	L2
W	Case width		20		20	nominal	L2
Hc	Case height		36.5		36.5	nominal	L2
E	Ear span		52.8		52.8	nominal	L2
He	Ear height		26.5		26.5	nominal	L2
te	Ear thickness		2.5		2.5	nominal	L2
A	Mounting hole spacing		47.8		47.8	nominal	L2
b	Hole spacing across		10.2		10.2	nominal	L2
dh	Mounting hole diameter		4.5		4.5	nominal	L2
xo	Output position		13.9		13.9	nominal	L2
xf	Output position, far ear		33.9		33.9	nominal	L2
ds	Output spline diameter		5.76		5.76	nominal	L2
zs	Output spline teeth		24		24	nominal	L2
hh	Horn top above the case		6.5		6.5	nominal	L2
hu	Horn clearance over the ears		12		12	nominal	L2
lw	Lead length		300		300	nominal	L2
lc	Connector length		14		14	nominal	L2

Drawing

As a PDF: CC-SERVO-SZ-hitec-hs311.pdf.

The Hitec HS-311 RC servo beside the Hitec HS-55 and the Hitec HS-422

The Hitec HS-311 is number 2 of the 3 RC servo RC servos published here, listed from Hitec HS-55 to Hitec HS-422.

• Case length (L): 40 mm on the Hitec HS-311 RC servo, against 22.8 mm on the Hitec HS-55 and 40.6 mm on the Hitec HS-422.
• Case width (W): 20 mm on the Hitec HS-311 RC servo, against 11.6 mm on the Hitec HS-55 and 19.8 mm on the Hitec HS-422.
• Case height (Hc): 36.5 mm on the Hitec HS-311 RC servo, against 24 mm on the Hitec HS-55 and 36.6 mm on the Hitec HS-422.
• Ear span (E): 52.8 mm on the Hitec HS-311 RC servo, against 32.6 mm on the Hitec HS-55 and 53.4 mm on the Hitec HS-422.
• Ear height (He): 26.5 mm on the Hitec HS-311 RC servo, against 16.7 mm on the Hitec HS-55 and 26.8 mm on the Hitec HS-422.
• Ear thickness (te): 2.5 mm on the Hitec HS-311 RC servo, against 1 mm on the Hitec HS-55 and 2.5 mm on the Hitec HS-422.
• Mounting hole spacing (A): 47.8 mm on the Hitec HS-311 RC servo, against 28.6 mm on the Hitec HS-55 and 48.4 mm on the Hitec HS-422.
• Hole spacing across (b): 10.2 mm on the Hitec HS-311 RC servo, against 10 mm on the Hitec HS-422.

Other sizes

• One size smaller: Micro RC Servo, Hitec HS-55, micro servo, case 22.8 × 11.6 × 24 mm, ears 32.6 mm, 2 mm mounting holes 28.6 mm apart.
• One size larger: Standard RC Servo, Hitec HS-422, standard servo, case 40.6 × 19.8 × 36.6 mm, ears 53.4 mm, 4.5 mm mounting holes 48.4 mm apart.

Documents

• CC-SERVO-DS-HITEC-HS311.pdf: hitec-hs311 datasheet: values with levels, sources
• CC-SERVO-SZ-hitec-hs311.pdf: hitec-hs311 drawing: this size's values on the views
• parts.json: the part record of this size (the platform contract)

Sources

hitec-hs311, hitec-hs311-drawing, hitec-hs311-product, hitec-hs311-spec-jp. Full citations: the method page and this size's datasheet.

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