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SELECTION GUIDE

What the Selden deck hardware catalogue covers and how to size from it: block families, load factors, wire breaking loads, and Selden's dimensioning guides for mainsheet blocks, halyard blocks, traveller, genoa and self-tacking cars by boat size.

DocumentSelden Deck Hardware Catalogue
FormatPDF · 41 pages · 13.9 MB
LanguageEnglish
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Selden Deck Hardware Catalogue Part 1 of 3PDF · 41 p.Part 2 of 3 (PDF pages 42–95)PDF · 54 p.Part 3 of 3 (PDF pages 96–114)PDF · 19 p.
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ContentsBlock FamiliesLoadsBlock SizingCars & TravellersPad Eyes & SpringsProducts
Selden Deck Hardware Catalogue

What the Catalogue Covers

Selden deck hardware catalogue (595-905-E, Version 12): blocks, tracks and travellers, cleats and swivels, deck organizers, complementary deck hardware and dimensioning. All Selden deck hardware is supplied with a 2-year warranty. Page numbers are as printed.

Section Pages
Choose the right product: loads, designations, block families 6–9
Blocks: plain bearing blocks (incl. Quick lock) 12–27
  Roller bearing blocks 28–31
  Ball bearing blocks 32–41
  Soft Attachment blocks 42–43
  Ratchet blocks (ARB 45, R60 / R60+) 44–47
  High load ball bearing blocks / high load plain bearing blocks 48–51
Tracks & travellers: System 15 (dinghies and small keelboats up to approximately 22') 54
  Tracks (22, 30, 42), fastening, genoa car loads, traveller features 56–61
  System 22 62–63
  System 30 64–67
  System 30 Performance (boats up to approximately 45') 68–71
  System 42 (boats up to approximately 65') 72–73
  Main and genoa system combinations (end controls + cars by system) 74–79
  Self tacking system 80–83
  Complete sheet systems, tackles 84–87
Cleats & swivels: cam cleats, Valley cleats, mast / eye / deck swivels 88–93
Deck organizers 94–95
Complementary deck hardware: fairleads, shackles, soft shackles, stand-up springs, pad eyes, eye bolts, low friction rings, double fairlead 96–101
Dimensioning: loads, dimensioning charts, unsupported tracks, hole patterns 102–112
Contents in alphabetical order 113

All Selden products are designed for sail handling and must NOT be used for human suspension.

Designations & Block Families

The first part of a Selden block designation gives the bearing system or special feature, the second part the sheave diameter: PBB 60 = Plain Bearing Block with a 60 mm sheave. All blocks in a family share the same sheave, and the sheave part number is the base of the block part number (PBB 60 sheave 406-001, PBB 60 single block 406-001-01). Sheave part numbers are stamped on the side of each sheave.

Family Bearing Art. no. series Page
PBB 16 / PBB 20 Plain bearing 401-001 / 402-001 14
PBB 40 Plain bearing 404-001 15
PBB 50 Plain bearing 405-001 16
PBB 60 Plain bearing 406-001 18
PBB 70 Plain bearing 407-001 20
PBB 80 Plain bearing 408-001 22
PBB 100 Plain bearing 410-001 24
PBB 60 / 80 Quick lock Plain bearing cheek 406-001 / 408-001 26
RBB 60 / RBB 80 Roller bearing 406-201 / 408-201 30–31
BBB 20 Ball bearing 402-101 34
BBB 30 Ball bearing 403-101 36
BBB 40 Ball bearing 404-101 38
BBB 60 Ball bearing 406-601 40
S20 / S30 / S40 Soft Attachment (ball bearing) 402-101-60 / 403-101-60 / 404-101-60 42
ARB 45 Automatic ratchet 404-401 45
R60 / R60+ Manual ratchet 406-350 / 406-360 46
High load 25 High load ball bearing 402-201 48
High load 40–120 High load plain bearing 404-201, 406-101, 408-101, 410-101, 413-101 50

Track and traveller systems by boat size (simplified model, page 7)

System Boat size
SYSTEM 15 Dinghy – 22'
SYSTEM 22 20' – 33'
SYSTEM 30 30' – 45'
SYSTEM 42 40' – 65'

Breaking Loads, Safe Working Loads & Load Factors

  • Breaking load: the load that breaks any part of the product under successively increasing laboratory loads.
  • Safe working load: set at half the breaking load.
  • Table values are for the product itself, not for the line. The load on the product depends on the load in the line and the deflection angle around the sheave: P = k × F.
  • Example from the catalogue: halyard load 800 kg, mast base block at 90° (k = 1.41) → 1128 kg, so a PBB 70 or RBB 60; deck organizer at 140° (k = 0.68) → 544 kg, organizer size 40. This is strength only; wear and friction may call for a bigger size.
  • Genoa car SWL is calculated at a 70° sheet angle (110° deflection). A high-performance #3 genoa may reach a 90° sheet angle: 1000 kg sheet load → 1226 kg on the car.

Load factor k by deflection angle

Angle a (°) k
0 2,00
10 1,99
20 1,97
30 1,93
40 1,88
50 1,81
60 1,73
70 1,64
80 1,53
90 1,41
100 1,29
110 1,15
120 1,00
130 0,85
140 0,68
150 0,52
160 0,35
170 0,17
180 0

Wire breaking load (kg)

Ø (mm) 1 x 19 wire 7 x 19 wire Compact wire (Dyform)
2 340 210 ---
2,5 540 330 ---
3 800 510 1000
4 1400 910 1800
5 2200 1420 2500
6 3100 2040 3600
7 4300 2780 4900
8 5600 3630 6200
10 8800 5200 9800
12 12600 --- 14400

Backstay cascade: the upper block's breaking load must match the backstay's; the requirement halves step by step for the remaining blocks, cascade legs and final tackle.

Dimensioning Blocks by Boat Size

Selden's guidelines are based on strength, function, wear and friction for yachts up to RM = 160 kNm (approx 55 feet); for larger yachts ask us. You need the main sail foot length E, the distance S from the aft side of the mast to the sheet attachment, whether the boom is end or mid sheeted, and the righting moment at 30° heel (or displacement / boat length). Boat sizes below are the figures printed on the charts.

Block Main sheet, end sheeted boom (S>90% of E) Main sheet, mid sheeted boom (S>50% of E) Main halyard, mast base
RBB 80 42' and up 36' – 52' 37' – 53'
RBB 60 35' – 50' 30' – 43' 31' – 44'
PBB 100 51' and up 43' and up 45' – 64'
PBB 80 39' and up 34' – 48' 34' – 49'
PBB 70 35' – 50' 30' – 43' 31' – 44'
PBB 60 31' – 45' 27' – 38' 28' – 39'
PBB 50 26' – 38' 23' – 32' 23' – 33'
PBB 40 20' – 29' 18' – 25' 18' – 26'
BBB 60 20' – 29' 18' – 25' 18' – 26'
BBB 60 HD 23' – 33' 20' – 29' 20' – 29'
BBB 40 18' – 26' 16' – 22' 16' – 23'
R 60 18' – 32' 18' – 32' –

Righting moment vs displacement (page 104)

RM 30° (kNm) Displ. (tonnes)
6 1.2
8 1.6
10 2.0
12 2.4
14 2.8
16 3.2
18 3.6
20 4.0
25 5.0
30 5.7
35 6.3
40 7.0
45 7.7
50 8.2
55 9.0
60 10
70 11
80 12
90 14
100 15
110 16
120 18
130 19
140 20
150 22
160 23

Selden dimensioning charts: mast base blocks for main, spinnaker and genoa halyards by righting moment and boat size

Selden dimensioning charts: topmast spinnaker halyard block, spinnaker sheet and guy, kicking strap and Rodkicker tackle blocks

The bars on the charts run against RM 30° (kNm); read the exact range in the PDF, pages 104–107.

Dimensioning Cars and Travellers by Boat Size

System Main sheet car, end sheeted (S>0,9*E) Main sheet car, mid sheeted (S>0,50*E) Genoa sheet car
SYSTEM 42 43' and up 39' and up 40' and up
SYSTEM 30 Perf. toggle 35' – 45' 32' – 45' –
SYSTEM 30 Perf. fixed block 30' – 43' 28' – 40' –
SYSTEM 30 Standard 35' – 44' 32' – 44' –
SYSTEM 30 Performance – – 34' – 45'
SYSTEM 30 Ball bearing – – 32' – 45'
SYSTEM 30 High load – – 30' – 42'
SYSTEM 30 – – 26' – 37'
SYSTEM 22 27' – 33' 24' – 33' 24' – 33'

Self tacking car

System Boat size
SYSTEM 42 Double 40' and up
SYSTEM 42 Single 30' – 45'
SYSTEM 30 Double 30' – 45'
SYSTEM 30 Single 30' – 40'
SYSTEM 22 25' – 35'

An unsupported high beam track (HB 22 / HB 30 / HB 42) can take the main sheet load if correctly dimensioned: the maximum unsupported length by RM and S/E is tabulated on page 108. Mount it with a minimum of three fixing bolts on either side of the unsupported length.

Pad Eyes, Blocks & Stand-up Springs

Stainless AISI 316. Safe working load applies when the pad eye is aligned with the direction of load. Hole patterns are on page 111.

Art. No. Pad eye SWL (kg) Breaking load (kg) Fasteners Combine with block Stand-up spring
508-815R Fixed pad eye Ø50 1000 2000 2xM6 PBB 50, BBB 60, MRB 60 308-074R View part →
508-816R Fixed pad eye Ø60 2000 4000 4xM6 PBB 60, PBB 70, RBB 60 308-085R View part →
508-817R Fixed pad eye Ø72 3000 6000 4xM8 PBB 80 308-093R View part →
508-818R Fixed pad eye Ø86 4000 8000 4xM10 PBB 100 308-095R View part →
508-347R Fixed pad eye 40x35 700 1400 4xM5 BBB 40, PBB 50 308-074R View part →
508-750-01R Foldable pad eye Ø6/42x42 1100 2200 3xM6 View part →
508-760-01R Foldable pad eye Ø8/54x54 2200 4400 3xM8 View part →

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

Products in this Selection Guide