Essential Knots Guide
The Observatory Almanac — Section 15.2
Practice before you need them. A knot you've tied once is not a knot you know. Each knot here includes enough detail to learn from, but hands-on practice is essential. Use paracord or rope and practice until each is automatic.
How to Use This Guide
Each entry includes: - Category — Primary use context - Strength Rating — How much the knot weakens the rope (100% = no weakening; most knots reduce line strength) - Best for — Primary applications - Tying instructions — Step-by-step text - Do NOT use when — Critical failure cases
1. Bowline
Category: Sailing, rescue, climbing (non-critical), camping Strength Rating: ~75% (weakens rope at knot) Best for: Creating a fixed loop at the end of a line; attaching to anchor points; rescue throw lines; mooring
Tying: 1. Form a small loop in the standing part of the rope (the "rabbit hole"), with the working end (tail) coming up through the loop. 2. Pass the working end up through the loop (the "rabbit comes out of the hole"). 3. Take the working end around behind the standing part (the "rabbit runs around the tree"). 4. Pass the working end back down through the small loop (the "rabbit goes back into the hole"). 5. Tighten by pulling the working end and the standing part simultaneously.
Memory aid: "The rabbit comes out of the hole, runs around the tree, and goes back into the hole."
Do NOT use: As a climbing knot for falls (no shock-load resistance; can invert under load and shake loose). In critical fall-arrest applications, use a figure-8 on a bight instead.
2. Clove Hitch
Category: Sailing, camping, climbing (temporary) Strength Rating: ~60–70% Best for: Quick attachment to a post, rail, or tree; starting/finishing lashings; temporary tie-offs
Tying (on a post): 1. Wrap the rope around the post from front to back. 2. Cross over the top of the first wrap diagonally. 3. Pass behind the post again. 4. Bring the working end under the diagonal cross, forming a loop. 5. Pull both ends tight.
Tying (in the hand, to drop over a post): 1. Form two loops in the same direction. 2. Fold the right loop behind the left loop. 3. Drop both loops over the post. 4. Tighten.
Do NOT use: As a primary load-bearing knot — it slips under variable loads. Do not use for critical holds or permanent moorings.
3. Figure-8 (and Figure-8 on a Bight / Trace-8)
Category: Climbing, sailing Strength Rating: ~75–80% Best for: Stopper knot; attaching climber to belay system; anchor building; creates a very secure non-slip loop
Figure-8 Stopper: 1. Form a loop by crossing the working end over the standing part. 2. Pass the working end around and under the standing part. 3. Pass the working end up through the original loop. 4. Tighten.
Figure-8 on a Bight (loop): 1. Double the rope to form a bight (a folded section). 2. Form a loop by crossing the bight over the standing parts. 3. Bring the bight around and under the standing parts. 4. Feed the bight up through the loop. 5. Tighten. The resulting loop can be clipped to a carabiner or anchor.
Trace-8 (Rewoven Figure-8, for attaching to a harness): 1. Tie a figure-8 loosely, leaving a long tail. 2. Thread the tail through the harness tie-in points. 3. Reweave the tail back through the figure-8, following the original path exactly, in reverse. 4. Ensure the tail exits cleanly with at least 6 inches remaining. 5. Finish with a backup stopper knot (overhand on the tail around the standing part).
Do NOT use: The figure-8 stopper as a connector — it's a stopper only. Use a figure-8 on a bight or trace-8 for load-bearing loops.
4. Square Knot (Reef Knot)
Category: Sailing, household, camping, first aid (bandaging) Strength Rating: ~45% Best for: Joining two ends of the same rope; securing a bandage or package; reefing sails
Tying: 1. Cross left over right and under. 2. Cross right over left and under. 3. Pull tight.
Memory aid: "Left over right, right over left" (or "right over left, left over right" — the key is alternating).
Do NOT use: To join two different ropes or ropes of different diameters — it will slip. Do not use for life-safety applications. The square knot can capsize (invert to a lark's head) under load. For joining ropes, use a sheet bend or double fisherman's.
5. Sheet Bend
Category: Sailing, camping, general Strength Rating: ~45–50% Best for: Joining two ropes, especially of different diameters or materials; extending a line
Tying: 1. Make a bight (U-shape) in the thicker or stiffer rope. 2. Pass the working end of the second rope up through the bight. 3. Wrap the second rope's working end around and behind both legs of the bight. 4. Pass the working end under its own standing part (not under the bight). 5. Tighten.
Double Sheet Bend: For security with very different diameters, wrap the second rope around the bight twice before tucking under itself.
Do NOT use: For joining ropes under heavy shock loading. Not as secure as the double fisherman's for permanent joins. Check regularly under load.
6. Trucker's Hitch
Category: Camping, trucking, sailing Strength Rating: ~75% Best for: Creating a mechanical advantage to tension a line; securing cargo; tying down loads; ridgelines
Tying: 1. Create a fixed point at one anchor (cleat hitch, around a post, etc.). 2. Form a slip loop (or directional figure-8) partway along the standing part, creating a loop that won't slide down. 3. Pass the working end through the anchor point at the other end. 4. Thread the working end back up through the slip loop — this creates a 2:1 mechanical advantage. 5. Pull down firmly to tension the line. 6. Secure the working end with two half hitches around the standing part (both above the loop).
Do NOT use: Without locking the slip loop with half hitches — the load will release catastrophically. Not for permanent installations.
7. Taut-Line Hitch
Category: Camping, sailing Strength Rating: ~60–70% Best for: Adjustable loop for tent guy lines, tarps, and clotheslines; slides along the rope but locks under load
Tying: 1. Pass the working end around the anchor. 2. Bring the working end parallel and inside (toward the anchor side of) the standing part. 3. Make two wraps around the standing part going toward the anchor. 4. Make one wrap around the standing part going away from the anchor (outside the previous wraps). 5. Pull tight. The knot should slide freely when pushed but grip when loaded.
Do NOT use: On slippery synthetic ropes (may slip). Not a primary safety knot.
8. Cleat Hitch
Category: Sailing, boating Strength Rating: ~85% Best for: Securing a line to a boat cleat quickly and reliably
Tying: 1. Lead the line around the base of the far horn of the cleat. 2. Take the line across the cleat diagonally to the near horn. 3. Go around the near horn, back across the cleat diagonally to the far horn. 4. Form a loop with the working end (by flipping your wrist so the line crosses itself). 5. Drop the loop over the far horn. 6. Snug tight — the locking loop prevents the line from slipping off.
Do NOT use: Without the locking loop — a simple figure-8 wrap can jam under heavy load.
9. Fisherman's Knot (Double Fisherman's)
Category: Fishing, climbing Strength Rating: ~65–70% Best for: Joining two ropes of similar diameter; closing loops of cord (Prusik loops); very secure joining knot
Tying the Double Fisherman's: 1. Lay the two rope ends parallel, pointing in opposite directions, overlapping about 6 inches. 2. With Rope A, wrap around both ropes twice going toward the tail. 3. Pass Rope A's tail back through both wraps (from right to left through the loops). 4. Tighten Rope A's knot. 5. Repeat the process with Rope B going in the opposite direction. 6. Pull the standing parts to slide the two knots together.
Do NOT use: To join ropes of very different diameters. Extremely difficult to untie once loaded — treat as semi-permanent.
10. Surgeon's Knot
Category: Surgical, fishing, household Strength Rating: ~65% Best for: Joining two lines for fishing leader connections; medical suturing; tying bandages securely; prevents premature tightening
Tying: 1. Cross the two lines (or the two ends of a doubled line). 2. Make two passes through the loop (instead of the square knot's one) — this extra pass prevents the knot from slipping while you tighten. 3. Cross the lines in the opposite direction. 4. Pass through the loop once (or twice for maximum security). 5. Tighten.
Do NOT use: In place of a proper suture in medical settings without proper training.
11. Prusik Hitch
Category: Climbing Strength Rating: ~65–75% (of the Prusik loop) Best for: Emergency ascent/descent on a fixed rope; creating a friction hitch that slides freely when unloaded but grips under load; rescues
Tying: 1. Use a Prusik loop (cord shorter and thinner than the main rope — about 5–7mm for a 10mm rope). 2. Hold the doubled loop next to the main rope. 3. Pass the loop's knot through the loop opening (wrap the loop around the main rope). 4. Repeat — wrap around again so the main rope passes through the loop knot 2–3 times total. 5. Dress the knot so all wraps lie neatly side by side. 6. Clip a carabiner through the loop below the wraps.
Do NOT use: On ropes of the same or larger diameter than the Prusik cord. The Prusik will not grip. In high-speed rappels, use a Klemheist or Autoblock instead.
12. Alpine Butterfly (Butterfly Loop)
Category: Climbing, rigging Strength Rating: ~65–70% Best for: Creating a fixed loop in the middle of a line when both ends are loaded; attaching middle climbers in a rope team; isolating a damaged section of rope
Tying (hand method): 1. Form a loop and twist it twice around your hand (wrap rope around hand twice). 2. Take the top wrap and fold it down over the lower wraps. 3. Pull this strand back under all wraps and out through the back of the original loop. 4. Remove from hand and tighten.
Do NOT use: When you need a directional load only on one end — the butterfly is for omnidirectional loading. Do not use as a directional pulley anchor.
13. Overhand Knot
Category: All categories — the most basic knot Strength Rating: ~50–60% (significant strength reduction) Best for: Stopper knot; beginning other knots; temporary knot; preventing a rope end from fraying through a hole
Tying: 1. Form a loop. 2. Pass the working end through the loop. 3. Tighten.
Do NOT use: As a joining knot or load-bearing knot — it's too weak and difficult to untie. Use as a stopper or backup only.
14. Half Hitch
Category: All categories Strength Rating: Poor alone Best for: Finishing a knot (two half hitches); in combination with other knots only; quick temporary attachment
Tying: 1. Pass the working end around an object. 2. Cross over the standing part. 3. Pass the working end under the standing part and up through the loop. 4. For two half hitches: Repeat steps to add a second identical hitch next to the first.
Do NOT use: As a standalone knot — one half hitch is not secure on its own.
15. Round Turn and Two Half Hitches
Category: Sailing, camping, general Strength Rating: ~70% Best for: Attaching a rope to a ring, post, or anchor when load may be heavy; mooring; hanging equipment
Tying: 1. Pass the rope around the object twice (the "round turn" — two full wraps). 2. Make a half hitch around the standing part. 3. Make a second half hitch next to the first. 4. Tighten.
Do NOT use: When a quick-release is required — the round turn must be unwound to release.
16. Timber Hitch
Category: Camping, logging Strength Rating: ~65% Best for: Dragging or hoisting logs and poles; the load self-tightens this knot; often used as a start for diagonal lashing
Tying: 1. Wrap the working end around the timber. 2. Loop around the standing part. 3. Twist the working end around itself three or more times. 4. Pull the standing part — the knot tightens with load.
Do NOT use: When load is removed and re-applied repeatedly — it loosens when unloaded. Best for dragging applications only.
17. Anchor Bend (Fisherman's Bend)
Category: Sailing Strength Rating: ~65–70% Best for: Attaching a rope to an anchor ring; very secure under constant heavy load; mooring
Tying: 1. Pass the rope through the ring twice (forming two turns through the ring). 2. Pass the working end over the standing part. 3. Pass it through both turns (back through both loops in the ring). 4. Finish with a half hitch around the standing part. 5. For permanent use, seize the tail to the standing part.
Do NOT use: When frequent tying/untying is required — it tightens with load.
18. Palomar Knot
Category: Fishing Strength Rating: ~90–95% — one of the strongest fishing knots Best for: Attaching line to hooks, lures, and swivels; works well with braided and monofilament line
Tying: 1. Double the line (form a bight) and pass 6 inches of the doubled line through the hook eye. 2. Tie a loose overhand knot with the doubled line above the hook. 3. Pass the loop portion of the bight down over the hook (so the hook passes through the loop). 4. Moisten, then pull both ends to tighten. 5. Trim the tag end.
Do NOT use: With lines heavier than 20 lbs on some lure styles — can be difficult to thread the hook through a small loop. Not ideal for large treble hooks.
19. Blood Knot
Category: Fishing Strength Rating: ~85–90% Best for: Joining two monofilament lines of similar diameter; creating leaders; excellent with fluorocarbon
Tying: 1. Overlap the two lines by 6 inches. 2. Wrap one line around the other 5–7 times, then bring the end back and pass it through the center between the two lines. 3. Do the same with the other line — wrap 5–7 times in the opposite direction, pass end back through center between the lines. 4. Both ends should come out of the center between the wraps, pointing in opposite directions. 5. Moisten, pull both standing parts to tighten slowly. 6. Trim ends close.
Do NOT use: With lines of very different diameters — use a surgeon's knot instead.
20. Improved Clinch Knot
Category: Fishing Strength Rating: ~85–90% Best for: Attaching monofilament line to hooks, swivels, and lures; the most widely used fishing knot
Tying: 1. Pass the line through the hook eye, leaving 6–8 inches of tag end. 2. Wrap the tag end around the standing line 5–7 times. 3. Pass the tag end back through the small loop formed between the hook eye and the first wrap. 4. Pass the tag end through the large loop just created. 5. Moisten, pull the tag end and standing line simultaneously to tighten. 6. Slide knot down to hook eye. Trim tag end.
Do NOT use: With braided line heavier than 15 lbs — use a Palomar instead. Not ideal for fluorocarbon lines.
21. Buntline Hitch
Category: Sailing Strength Rating: ~70% Best for: Attaching a line to a shackle or ring; very secure under working loads; traditional sailing knot
Tying: 1. Pass the working end through the ring or shackle. 2. Make a clove hitch on the standing part. 3. Dress and tighten.
Do NOT use: When quick release is required — it jams very tightly under load.
22. Rolling Hitch
Category: Sailing, climbing, camping Strength Rating: ~60% Best for: Attaching to another rope or smooth surface with a lengthwise pull; adding a backup to a taut line; creating a slide-and-grip hitch for inline loads
Tying: 1. Wrap the working end around the host rope or pole from front to back. 2. Make a second wrap in the same direction, crossing over the first wrap. 3. Pass behind the host and bring the working end under the diagonal between the two wraps. 4. Tighten in the direction of intended load.
Do NOT use: For crosswise (perpendicular) loads — use a clove hitch instead. The rolling hitch only grips under lengthwise pull.
23. Constrictor Knot
Category: Household, camping, general utility Strength Rating: ~65% Best for: Whipping rope ends; temporarily binding objects; closing bags; clamping hoses; the hardest-gripping binding knot
Tying: 1. Wrap the working end around the object. 2. Cross over the standing part diagonally, wrapping around the object again. 3. Pass the working end under the diagonal cross and under the first wrap — the working end is now trapped under its own turns. 4. Tighten very firmly.
Note: Cut the knot off — it is nearly impossible to untie once tightened under load.
Do NOT use: When you need to untie it later. It requires cutting to remove once set.
24. Monkey's Fist
Category: Sailing, household, decorative Strength Rating: N/A (primarily a weighted heaving knot) Best for: Making a heaving line (weighted end for throwing); decorative knots; key fobs
Tying: 1. Hold rope and form 3 horizontal wraps around your hand. 2. Without removing from hand, make 3 vertical wraps around the horizontal loops (around the outside). 3. Pass the working end through the inside of the horizontal loops. 4. Make 3 wraps horizontally around the vertical wraps. 5. Work the knot tightly, chasing each loop with your finger to remove slack — add a weighted core (marble, steel ball) if desired. 6. Finish with a stopper knot or attach to a line.
Do NOT use: As a security knot — it is not a load-bearing knot.
25. Turk's Head
Category: Decorative, sailing, camping Strength Rating: N/A (ornamental) Best for: Handle wraps; napkin rings; decorative bandana slides; marking points on rope or rails
Tying (3-lead, 5-bight simplified): 1. Form a loop, crossing the working end over the standing part. 2. Pass the working end around the back and cross it over itself. 3. Weave over-under-over through the existing loops. 4. Follow the path around again to triple the thickness. 5. Tighten gradually and evenly.
Best learned with visual reference and a mandrel (cylindrical form).
26. Lark's Head (Cow Hitch)
Category: Household, camping, crafts Strength Rating: ~50% Best for: Attaching a ring or loop to an object; lanyard attachments; quick non-critical hitches
Tying (Lark's Head with loop): 1. Fold line in half, forming a bight. 2. Pass the bight through or around the object. 3. Pass both ends of the line through the bight. 4. Pull tight.
Cow Hitch (Girth Hitch) — attaching a sling: 1. Pass one end of the loop through the ring. 2. Pass the whole loop through the end that came through. 3. Tighten.
Do NOT use: For significant loads — it slips and is weak. Not for climbing applications or heavy rigging.
27. Daisy Chain
Category: Camping, storage, climbing Strength Rating: ~40–60% (varies — individual links can fail) Best for: Storing rope without tangles; creating multiple attachment points on a single cord; shortening long lines
Tying: 1. Fold a bight of rope. 2. Pull another bight through the first bight — you have the beginning of a chain stitch. 3. Continue pulling new bights through the previous bight. 4. Lock the last bight by passing the end of the rope through it.
Functions like a crochet chain — each link releases quickly when the end is pulled.
Do NOT use: As a shock-absorber or primary fall-arrest device. Each link reduces strength. Not for critical loads.
28. Water Knot (Tape Knot / Ring Bend)
Category: Climbing, canyoneering Strength Rating: ~70–75% Best for: Joining two flat webbing straps; closing a loop of webbing for an anchor; the standard knot for webbing
Tying: 1. Tie a simple overhand knot loosely in one end of the webbing, leaving a long tail. 2. Pass the second piece of webbing (or the other end) into the knot from the opposite direction. 3. Trace exactly through the overhand knot with the second webbing, following every curve of the original knot in reverse. 4. Tighten carefully — webbing must lie flat without twisting. 5. Leave 2–3 inch tails on each side. 6. Check regularly — the water knot can creep under load.
Do NOT use: Without regular inspection — this knot can work loose with load cycling. Do not use in wet conditions without re-tightening; check frequently.
29. Alpine Butterfly (Alternate Method — Loop-On-Post)
(See entry #12 for first method)
Tying using a post: 1. Take two turns around a post or your hand in the same direction. 2. Grab the middle turn and fold it back over the other two turns. 3. Tuck it down and under those two turns, then pull it out through the back. 4. Tighten on both standing parts.
30. Prusik Loop Closing with Double Fisherman's
(See Fisherman's Knot, #9 for tying instructions)
Creating a Prusik loop: 1. Cut a length of 5–7mm cord, approximately 4–5 feet long. 2. Join the two ends with a double fisherman's knot (entry #9). 3. The finished loop is your Prusik sling, ready for use with the Prusik hitch (entry #11).
Quick Reference Table
| Knot | Category | Use | Strength | Untie After Load? |
|---|---|---|---|---|
| Bowline | Sailing/Rescue | Fixed loop at end | ~75% | Yes |
| Clove Hitch | Sailing/Camping | Attach to post | ~65% | Yes (sometimes) |
| Figure-8 | Climbing | Stopper / loop | ~75% | Yes (with effort) |
| Square/Reef | Sailing/First Aid | Join same rope | ~45% | Yes |
| Sheet Bend | Sailing | Join two ropes | ~45% | Yes |
| Trucker's Hitch | Camping | Tension system | ~75% | Yes |
| Taut-Line | Camping | Adjustable loop | ~65% | Yes |
| Cleat Hitch | Sailing | Cleat attachment | ~85% | Yes |
| Double Fisherman's | Climbing | Join ropes | ~65% | No (nearly) |
| Surgeon's | Fishing/Medical | Join lines | ~65% | Yes |
| Prusik | Climbing | Friction hitch | ~70% | Yes |
| Alpine Butterfly | Climbing | Midline loop | ~65% | Yes |
| Overhand | All | Stopper | ~50% | Hard |
| Half Hitch | All | Finish/temp | Poor alone | Yes |
| Round Turn + 2HH | Sailing | Ring/post | ~70% | Yes |
| Timber Hitch | Camping | Drag timber | ~65% | Yes (when unloaded) |
| Anchor Bend | Sailing | Anchor ring | ~65% | Hard |
| Palomar | Fishing | Hook/lure | ~92% | No |
| Blood Knot | Fishing | Join mono | ~88% | No |
| Clinch | Fishing | Hook/lure | ~87% | No |
| Buntline Hitch | Sailing | Ring/shackle | ~70% | Hard |
| Rolling Hitch | Sailing | Inline grip | ~60% | Yes |
| Constrictor | Utility | Binding | ~65% | No (cut) |
| Monkey's Fist | Sailing | Heave weight | N/A | N/A |
| Turk's Head | Decorative | Ornamental | N/A | N/A |
| Lark's/Cow Hitch | Household | Quick attach | ~50% | Yes |
| Daisy Chain | Camping/Storage | Chain link | ~50% | Quick-release |
| Water Knot | Climbing | Webbing join | ~72% | Yes (stiff) |
| Alpine Butterfly | Climbing | Midline loop | ~65% | Yes |
| Prusik Loop | Climbing | Friction loop | ~65% | Yes |
Knot Care and Safety Notes
- Wet knots: Most natural fiber knots grip better wet; most synthetic fiber knots slip more. Know your rope material.
- Strength: All knots reduce line strength. When strength matters, use the right knot (Palomar for fishing, Figure-8 for climbing).
- Dressing: A knot that isn't "dressed" (properly formed with no crossings or twists in the wrong place) will fail prematurely. Always dress and set knots before loading.
- Tail length: Leave adequate tail — at least 6 times the rope diameter, minimum 2–3 inches.
- Inspection: Knots used for safety (climbing, rescue) should be inspected before every use.
- Replacement: Retire any rope or webbing that shows signs of wear, UV damage, or has taken a heavy shock load.
Section 15.2 — The Observatory Almanac