Torque Specifications

Background of Fasteners

Various types of joints and fasteners are used to assemble components together throughout Freefly products. Depending on the types of materials used, joint design, and fastener used, this document serves as a standard to be referenced where applicable.

Definitions:

  1. SHCS: Socket head cap screw

  2. BHCS: Button head cap screw

  3. FHCS: Flat head cap screw

  4. CHCS: Combo head cap screw. Freefly Systems proprietary combination type fastener

Four major types of joints are to be considered, as shown below. These are largely simplified as there are numerous combinations of clamped material vs. threaded material. Materials listed below signify the “clamped” materials and does NOT indicate the threaded material.

Thread-Locking Fluid.

Thread-locking fluid should be used on metal-metal or composite-metal joints that do not require constant adjustment. In general, Loctite type 222 shall be used unless otherwise stated.

  1. WARNING: Thread locking fluid (eg Loctite 222) should not be used with plastic joints, or when fastening polycarbonate plastic.

Joint Torque Specifications

Standard Fasteners

  • Fastener installation set torque for standard bolts into metallic threads

    • Clamped Material (Assumes threaded material is metallic)

All torques are listed as Nm

Aluminium

Aluminium

Plastic

Plastic

Carbon

Carbon

PCBA

PCBA

Steel

Steel

Fastener type/ size

FHCS/ BHCS

SHCS/

CHCS

FHCS/ BHCS

SHCS/

CHCS

FHCS/ BHCS

SHCS/

CHCS

FHCS/ BHCS

SHCS/

CHCS

FHCS/ BHC

SHCS/

CHCS

M1.6

0.2

M1.9

M2

0.3

0.3

0.3

0.2

0.2

M2.5

0.4

0.2

M3

1.1

1.5

.8

.8

1.0

1.0

0.7

0.7

M4

1.5

2.0

M5

3.0

M6

3.0

M7

M8

#0

#1

#2

#3

#4

#5

#6

#8

#10

#12

¼”

⅜”

Plastite Thread Forming Fasteners

  • Clamped Material (Assumes threaded material is PA6 nylo, 30% glass filled, 1000rpm installation speed

All torques are listed as Nm

Aluminium

Plastic

Carbon

PCBA

Steel

Fastener type/ size

BHCS Thread Forming/ Plastite

BHCS Thread Forming/ Plastite

BHCS Thread Forming/ Plastite

BHCS Thread Forming/ Plastite

BHCS Thread Forming/ Plastite

M1.6

M1.9

0.25 (.4)

.4

0.1

M2

.25

0.2

M2.5

0.6

M3

1.1

M4

48-2

.35