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First Mate Series

Thern Portable Cranes

First Mate Series Cranes from Thern

  Models

Specifications for First Mate Cranes from Thern

It is the owner's or operator's responsibility to determine the suitability of the equipment to its intended use. Study all applicable codes, manuals and regulations. Be sure to read the Owner's Manual supplied with the equipment before operating it.

Longer Lift Distances
First Mate cranes can be configured with non-standard manual or power winch operation for longer lifts up to 240 ft. (73.1 m) below floor level. Long lift ratings require electric winches. Maximum capacity may vary depending on wire rope diameters. Contact factory for more information.

First Mate Series Performance Characteristics

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Wire Rope Load Rating
5122 Series with M1
Load Rating
5122 Series with M3
Lift Below Floor Level1
Rope Length Rope Diameter Position A Position B Position A Position B Min Below Max Below
ft m in mm lb kg lb kg lb kg lb kg ft m ft m
20 6 3/16 4.8 500 227 500 227 500 227 500 227 9 2.7 10 3.0
28 9 3/16 4.8 500 227 500 227 500 227 500 227 17 5.1 18 5.4
36 11 3/16 4.8 500 227 500 227 500 227 500 227 25 7.6 26 7.9
45 14 3/16 4.8 500 227 500 227 500 227 500 227 34 10.3 35 10.6
60 19 3/16 4.8 500 227 500 227 49 14.9 50 15.2
75 23 3/16 4.8 500 227 500 227 64 19.5 65 19.8

1 Based on pedestal base. Lift before floor level varies depending on boom position and base configuration. For longer lifts, please consult your mdi sales representative.


Model Number Construction

Model Number Structure (NOT an actual model number!): AAAA BB CCC

Model Number Sample (actual model number!): 5122M1GAL
Product: Portable davit crane (up to 500 lb capacity), with M4022PB-K zinc-plated spur gear hand winch and galvanized finish (crane only).

Instructions: Replace the lettered portions of the Model Number Structure to match the desired specifications of your product, as listed below:


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AAAA - Crane Model 5122
Model Description Approx. Ship Weight
51221 Up to 500 lb capacity - portable davit crane 54 lbs (24.5 kg)

1 Base Model includes corrosion resistant electrostatic powder coated finish.
Other finishes available. See table below.


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BB - Winch Options
Winch Description Approx. Ship Weight
M1 M4022PB-K - zinc plated spur gear hand winch 16 lbs (8 kg)
M3 M4042PBSS-K - stainless steel spur gear hand winch 23 lbs (10 kg)

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CCC - Optional Finish (crane only)
Finish Description
GAL Galvanized finish
SS Stainless steel construction

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Independent Bases (sold separately)
Finish Pedestal Flush Wall Wheel
Powder Coat Paint 522 522 522
Galvanized 522GAL 522GAL 522WGAL
304 Stainless Steel 522SS 522SS 522SSW
Enamel 514
Approximate
Ship Weight
18 lbs
(9 kg)
18 lbs
(9 kg)
21 lbs
(10 kg)
80 lbs
(37 kg)

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Wire Rope Assemblies
Model Number Wire Rope
Diameter x Length
Approx.
Ship Weight
Galvanized aircraft cable with swivel hook and swaged ball fitting.
WA19-20NS 3/16 in x 20 ft 3 lbs (2 kg)
WA19-28NS 3/16 in x 28 ft 4 lbs (2 kg)
WA19-36NS 3/16 in x 36 ft 4 lbs (2 kg)
WA19-45NS 3/16 in x 45 ft 7 lbs (4 kg)
304 Stainless steel wire rope with SS oval hook and swaged ball fitting.
Swivel hook also available. Please contact your mdi sales representative.
WS19-20NS 3/16 in x 20 ft 3 lbs (2 kg)
WS19-28NS 3/16 in x 28 ft 3 lbs (2 kg)
WS19-36NS 3/16 in x 36 ft 4 lbs (2 kg)
WS19-45NS 3/16 in x 45 ft 7 lbs (4 kg)
WS19-60NS 3/16 in x 60 ft 9 lbs (5 kg)
WS19-75NS 3/16 in x 75 ft 11 lbs (5 kg)

  Features

Lightweight, economical, easy to carry and easy to use, the First Mate 500 is perfect for a wide variety of simple jobs where adjustable height and reach are not required.


  • Crane Model 5122
  • Adjustable Boom Angle with two different positions for operation.
  • Crane Rotates 360° in a sleeve bearing in the base.
  • Crane Folds Down for storage or transport.
  • Winch Models
  • Hand Winch Operation with spur gear hand winch equipped with automatic disc brake for load control.
  • Quick Disconnect Anchor for quickly attaching or removing wire rope equipped with a swaged ball fitting.
  • Optional Finishes
  • Galvanized Finish provides extra protection against corrosion.
  • Stainless Steel Models are constructed from all stainless steel with an electro-polished finish for superior corrosion resistance.

  • Independent Bases
  • Pedestal, Socket (flush mount) or Wall styles available for a variety of configurations.
  • Wheel Base (Model 514) for floor crane operation. Base includes steel front wheels and rear caster wheels for 360° maneuverability.
  • Wire Rope Assemblies
  • Galvanized or Stainless Steel wire rope assemblies with swaged ball fitting to work with the quick disconnect anchor on the winch.

Accessories

  • Base Anchor Kits
  • Photo of a base anchor kit portable davit crane accessory from Thern.
  • (Hilti®) 2.3 lbs (10 kg)
  • AN50A-5 - Zinc-plated steel
  • AN50A-5S - 304 Stainless steel
  • Cable Spool
  • Photo of a cable spool portable davit crane accessory from Thern.
  • Model No. RW50 - 316 Stainless steel reel winds up wire rope when detached from crane. 12 lbs (5.5 kg)
  • Wire Rope Keeper
  • Photo of a wire rope keeper portable davit crane accessory from Thern.
  • Model RK19-25S - Stainless Steel bracket attaches to base or other structure to hold free end of wire rope when detached from crane.
  • Headache Ball
  • Photo of headache ball portable davit crane accessories from Thern.
  • HB10-12-25 - Painted Steel - 10 lbs (4.5 kg)
  • HB10S-12-38 - 304 Stainless Steel - 10 lbs (4.5 kg)

  Dimensions

Models with Pedestal Base

Dimensions for Pedestal Base First Mate Cranes from Thern

Dimensions for Pedestal Base First Mate Cranes from Thern

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Boom Position Hook Reach Hook Height
(in) (mm) (in) (mm)
A 42 1066 37 939
B 35 889 60 1524



Models with Flush Mount or Wall Mount Base

Dimensions for Wall Mount Base First Mate Cranes from Thern

Dimensions for Wall Mount Base First Mate Cranes from Thern

Dimensions for Wall Mount Base First Mate Cranes from Thern

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Boom Position Hook Reach Hook Height
(in) (mm) (in) (mm)
A 42 1066 22 558
B 35 889 45 1143



Models with Wheel Mount Base

Dimensions for Wheel Mount Base First Mate Cranes from Thern

Dimensions for Wheel Mount Base First Mate Cranes from Thern

Dimensions for Wheel Mount Base First Mate Cranes from Thern

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Boom Position Hook Reach Hook Height
(in) (mm) (in) (mm)
A 42 1066 42 1066
B 35 889 65 1651

  Contact mdi

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